Silicon Containing Additive Other Than Clay Patents (Class 162/181.6)
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Publication number: 20030089476Abstract: A decorative base paper for decorative coating materials contains a pigment mixture of titanium dioxide and talc, wherein the talc has a particle size distribution D50 of less than approximately 3.0 &mgr;m, and both the decorative base paper and the decorative paper have a high capacity.Type: ApplicationFiled: November 13, 2001Publication date: May 15, 2003Inventor: Hartmut Schulz
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Patent number: 6551456Abstract: The present invention provides a synthetic fiber paper, the synthetic fiber paper comprises poly (phenylene terephthal amide) fiber, polyethylene glycol terephthalate fiber and powdered mica. The synthetic fiber paper has high-temperature resistance, high strength, low-deformability, resistivity against fire, burning resistance, resistance to chemical corrosion and excellent property of electric insulation, it can be widely applied in the field of mechano-electronics product, aviation, aerospace, military project for national defence, high-tech areas for civil use, high-voltage equipment, high-temperature circumstance as insulting material, it often can be used in composite materials with special use as structural material. The present invention also provides a process for preparing this synthetic fiber paper.Type: GrantFiled: September 3, 2002Date of Patent: April 22, 2003Assignee: Sichuan Foreign Economic Relations & Trade CorporationInventors: Xingli Wang, Shiyi Tao
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Publication number: 20030066617Abstract: The invention relates to an aqueous silica-based sol comprising a nitrogen-containing organic compound and silica-based particles with a specific surface area of at least 300 square meters per gram of silica. The invention further relates to a process for the production of an aqueous silica-based sol comprising a nitrogen-containing organic compound which comprises incorporating a nitrogen-containing organic compound into a silica-based sol containing silica-based particles with a specific surface area of at least 300 square meters per gram of silica. The invention also relates to the use of an aqueous silica-based sol comprising a nitrogen-containing organic compound and silica-based particles with a specific surface area of at least 300 square meters per gram of silica as a flocculating agent in the production of pulp and paper and in water purification.Type: ApplicationFiled: September 23, 2002Publication date: April 10, 2003Inventors: Peter Greenwood, Magnus Olof Linsten, Hans E Johansson-Vestin
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Publication number: 20030056912Abstract: The invention concerns a catalyst carrier comprising a fibre paper impregnated with a slurry comprising silica sol, micro fibres and a filler, wherein said micro fibres have an equivalent average particle size, measured with sedigraph method, from about 200 nm to about 30000 nm and said filler has an average equivalent particle size, measured with sedigraph method, from about 300 to about 10000 nm. The invention further concerns a method of its preparation, a slurry useful therefore, a catalyst comprising such a catalyst carrier and use of the catalyst.Type: ApplicationFiled: September 28, 2001Publication date: March 27, 2003Applicant: AKZO NOBEL N.V.Inventors: Anna-Carin Dellve, Bozena Tokarz, Mats Nystrom
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Publication number: 20030051838Abstract: The present invention provides a synthetic fiber paper, the synthetic fiber paper comprises poly (phenylene terephthal amide) fiber, polyethylene glycol terephthalate fiber and powdered mica. The synthetic fiber paper has high-temperature resistance, high strength. low-deformability, resistivity against fire, burning resistance, resistance to chemical corrosion and excellent property of electric insulation, it can be widely applied in the field of mechano-electronics product, aviation, aerospace, military project for national defense, high-tech areas for civil use, high-voltage equipment, high-temperature circumstance as insulting material, it often can be used in composite materials with special use as structural material. The present invention also provides a process for preparing this synthetic fiber paper.Type: ApplicationFiled: September 3, 2002Publication date: March 20, 2003Applicant: Sichuan Foreign Economic Relations & Trade CorporationInventors: Xingli Wang, Shiyi Tao
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Patent number: 6533897Abstract: The present invention is drawn to a thermally and structurally stable, noncombustible paper, comprising a dominant amount of aluminosilicate refractory fibers and from 0.2% to 4% by weight of a polymeric binder. The refractory fibers can be substantially from 1 micron to 35 microns in width and from 1 cm to 15 cm in length, though other functional dimensions can be used. Optionally, from 0.1% to 5% by weight of viscose fibers and/or from 0.2% to 5% by weight of silicic acid aquagel can also be present. The papers of the present invention are mat-type papers that can be structurally stable at very high temperatures up to about 1400° C. or more.Type: GrantFiled: April 13, 2001Date of Patent: March 18, 2003Assignee: FMJ Technologies, LLCInventors: Roger C. Y. Wang, John Titus
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Publication number: 20030045164Abstract: The present invention provides a nonwoven fabric material prepared from short fibers including thermal-resistant synthetic fibers bound with an inorganic binder, a prepreg and a circuit board using the same. The circuit board has an excellent dimensional stability even at a high temperature, and the circuit board is prevented from warping or being damaged by moisture absorption or the like. The inorganic binder is a residue formed from a low melting point glass solution or a water-dispersible colloidal solution including at least either fibers or particles of low melting point glass dispersed therein. When the binder is used, a chemical covalent bonding by a siloxane bonding is formed.Type: ApplicationFiled: February 17, 2000Publication date: March 6, 2003Inventors: Fumio Echigo, Yoshihiro Kawakita
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Patent number: 6524440Abstract: Starch compositions, including cationic crosslinked starches, and methods of using those starches in papermaking are disclosed. In particular, a cationized crosslinked starch and use of the starch in the wet end system of a paper machine is disclosed. The starch compositions of the disclosure are particularly adapted for customization for specific wet end systems, and allow for modification to correspond to variations in the wet end of the papermaking machine.Type: GrantFiled: December 19, 2000Date of Patent: February 25, 2003Assignee: Cargill, Inc.Inventors: Kevin Ray Anderson, David Edward Garlie
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Patent number: 6524439Abstract: According to the present invention a process is provided for making paper or paper board comprising forming a cellulosic suspension, flocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet, characterised in that the suspension is flocculated using a flocculation system comprising a siliceous material and organic microparticies which have an unswollen particle diameter of less than 750 nanometers.Type: GrantFiled: October 10, 2001Date of Patent: February 25, 2003Assignee: Ciba Specialty Chemicals Water Treatments Ltd.Inventors: Gordon Cheng I. Chen, Gary Peter Richardson
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Publication number: 20030029590Abstract: Silica-calcium carbonate composition particles having the characteristics of both synthetic silica and calcium carbonate without a lowering thereof are described along with paper internally filling the particles and a method for making the particles.Type: ApplicationFiled: August 20, 2002Publication date: February 13, 2003Inventors: Katsuyuki Tanabe, Kouhei Mitsuhashi
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Patent number: 6517677Abstract: This invention is directed to a method of improving retention and drainage performance in a papermaking process comprising adding to the furnish an effective amount of a low molecular weight water-soluble cationic dispersion polymer prepared by polymerizing one or more cationic monomers and one or more nonionic monomers and one or more chain transfer agents under free radical forming conditions in an aqueous solution of an anionic salt in the presence of a stabilizer polymer, wherein the cationic dispersion has a cationic charge of from about 10 mole percent to about 80 mole percent and an RSV of from about 0.2 dl/g to about 6 dl/g.Type: GrantFiled: January 4, 2002Date of Patent: February 11, 2003Assignee: Ondeo Nalco CompanyInventors: Richard P. Cardile, John W. Sparapany, Cathy C. Johnson, Angela P. Zagala
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Publication number: 20030024671Abstract: An aqueous sol containing silica-based particles which has an S-value within the range of from 10 to 45%, a viscosity within the range of from 5 to 40 cP, and a molar ratio of SiO2 to M2O, where M is alkali metal or ammonium, within the range of from 10:1 to 40:1, or a silica content of at least 10% by weight. The invention further relates to a process for the production of silica-based particles comprising the steps of: (a) acidifying an aqueous silicate solution to a pH of from 1 to 4 to form an acid sol; (b) alkalising the acid sol at an SiO2 content within the range of from 4.5 to 8% by weight to; (c) allowing particle growth of the alkalised sol for at least 10 minutes, or heat-treating the alkalised sol at a temperature of a least 30° C.; and then (d) alkalising the obtained sol to a pH of at least 10.0.Type: ApplicationFiled: November 5, 2001Publication date: February 6, 2003Inventors: Michael Persson, Marek Tokarz, Maj-Lis Dahlgren
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Publication number: 20020198306Abstract: The present invention relates to an aqueous composition comprising anionic organic polymeric particles and colloidal anionic silica-based particles. The anionic organic polymeric particles are obtainable by polymerising one or more ethylenically unsaturated monomers together with one or more polyfunctional branching agents and/or polyfunctional crosslinking agents. The anionic organic polymeric particles and the colloidal anionic silica-based particles in the aqueous composition are present in an amount of at least 0.01% by weight based on the total weight of the aqueous composition. The present invention further relates to a method for the preparation of the aqueous composition, uses of the aqueous composition and a process for the production or paper, in which the aqueous composition is added to a cellulosic suspension.Type: ApplicationFiled: June 11, 2002Publication date: December 26, 2002Inventors: Duncan Carr, Michael Sigman
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Publication number: 20020195218Abstract: A process for making paper comprising forming a cellulosic suspension, flocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet, wherein the cellulosic suspension is flocculated by addition of a water soluble polymer which is selected fromType: ApplicationFiled: August 2, 2002Publication date: December 26, 2002Inventor: Gordon Cheng I Chen
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Publication number: 20020189774Abstract: This invention relates to an improvement in coatings particularly suited for the preparation of paper products having an ink jet coating applied thereto and to the resulting paper products. The improvement in ink jet coatings resides in the incorporation of a primary amine functional polyvinyl alcohol (PVOH/PVNH2) as a polymeric binder. One form of an amine functional polyvinyl alcohol is produced by the hydrolysis of a copolymer of vinyl acetate and N-vinylformamide or vinyl acetate and allyl amine. Another is the polyvinyl butyral derivative of polyvinyl alcohol which typically is formed by the reaction of a 4-amino alkyl aldehyde dialkyl acetal, such as 4-aminobutyraldehyde dimethyl acetal with polyvinyl alcohol.Type: ApplicationFiled: March 8, 2001Publication date: December 19, 2002Inventor: John Richard Boylan
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Patent number: 6494991Abstract: Composite products having mineral networks polymerized about cellulosic material and a method for making such products are described. One embodiment of the composite product comprises a paper product having a polymerized mineral network, such as a silica/silicate network around, throughout and/or about the cellulosic material instead of having isolated particles of filler material deposited onto, or purposefully bonded to, the cellulosic material. One embodiment of the method comprises providing a mixture comprising cellulosic material, a Group I metal silicate and a Group II metal base or salt. The mixture is then carbonated to produce a product comprising precipitated carbonate filler material and a polymerized mineral network about the cellulosic material. This product is then formed into paper products wherein the ash content can be substantially greater than conventional paper products while maintaining suitable strength properties.Type: GrantFiled: July 2, 2001Date of Patent: December 17, 2002Assignee: Boise Cascade CorporationInventors: Richard F. Palmer, Mike S. D. Juang, James S. Johnson, Barbara R. Atha, David T. Lee, Larry L. Malcom
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Publication number: 20020179267Abstract: The present invention relates to polysilicate microgels, their preparation and use in paper making and water purification, the polysilicate microgels being obtainable by a process which comprises bringing into contact (i) particles of a salt AB with an aqueous silicate or polysilicate solution, (ii) an ion A with an ion B in the presence of an aqueous silicate or polysilicate solution, whereby the salt AB is precipitating in the aqueous phase, or (iii) an ion A with an ion B in the presence of an aqueous silicate or polysilicate solution, whereby the ions A and B represent ions of a precipitable salt AB having a pKS value of at least 4, measured at 20° C. in water. The invention further relates to aqueous silicate or polysilicate solutions, their preparation and use as precursors for polysilicate microgels.Type: ApplicationFiled: July 1, 2002Publication date: December 5, 2002Inventors: Michael Persson, Marek Tadeusz Tokarz, Rein Sikkar
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Publication number: 20020174963Abstract: The present invention is drawn to a thermally and structurally stable, noncombustible paper, comprising a dominant amount of aluminosilicate refractory fibers and from 0.2% to 4% by weight of a polymeric binder. The refractory fibers can be substantially from 1 micron to 35 microns in width and from 1 cm to 15 cm in length, though other functional dimensions can be used. Optionally, from 0.1% to 5% by weight of viscose fibers and/or from 0.2% to 5% by weight of silicic acid aquagel can also be present. The papers of the present invention are mat-type papers that can be structurally stable at very high temperatures up to about 1400° C. or more.Type: ApplicationFiled: April 13, 2001Publication date: November 28, 2002Applicant: FMJ Technologies, LLCInventors: Roger C.Y. Wang, John Titus
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Patent number: 6486216Abstract: A stable aquasol containing colloidal silica having a surface area of from about 700 m2/g to about 1100 m2/g, and an S-value of from about 20 to about 50; wherein the colloidal silica is not surface treated; wherein the molar ratio of SiO2/Na2O in the colloidal silica is greater than about 13.0:1 and is less than about 17.0:1; and wherein the aquasols have a percent by weight SiO2 solids level of from about 7.00 percent to about 16.80 percent is described and claimed.Type: GrantFiled: June 27, 2000Date of Patent: November 26, 2002Assignee: Ondeo Nalco CompanyInventors: Bruce A. Keiser, Maureen B. Nunn, Cheng-Sung Huang, Dennis L. MacDonald
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Publication number: 20020170690Abstract: Described is a micro-structured paper or paper-like material having a self-cleaning and/or non-adhesive effect whereby the paper or paper-like material is hydrophobic across the entire cross-section of the material and which is micro-structured in such a way that the surface is provided with elevations and depressions whereby the distance between the elevations ranges from 0.04 to 100 microns and the height of the elevations ranges from 0.04 to 100 microns, and whereby the paper or paper-like material is characterized in that it contains particles having the size of 0.04 to 50 microns that are bound to the paper or paper-like material by means of a binder, and whereby the paper or paper-like material is hydrophobic across the entire cross section of the material, as well as a method for the production thereof.Type: ApplicationFiled: February 12, 2002Publication date: November 21, 2002Inventors: Martin Buchsel, Manfred Kaussen, Sabine Schroft
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Patent number: 6475340Abstract: A wet-laid, porous solid phase extraction sheet material that contains both active particles and binder and that possesses excellent wet strength is described. The binder is present in a relatively small amount while the particles are present in a relatively large amount. The sheet material is sufficiently strong and flexible so as to be pleatable so that, for example, it can be used in a cartridge device.Type: GrantFiled: March 15, 1999Date of Patent: November 5, 2002Assignee: 3M Innovative Properties CompanyInventors: Kurt C. Carlson, Roger L. Langer
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Patent number: 6464832Abstract: A simplified method for the optical brightening of paper either in the pulp mass, the size or metering press or by coating by the use of a formulation of an optical brightening agent together with a swellable layered silicate.Type: GrantFiled: September 10, 2001Date of Patent: October 15, 2002Assignee: Ciba Specialty Chemicals CorporationInventors: Thomas Engelhardt, Peter Rohringer
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Publication number: 20020139502Abstract: The present invention relates to process for the production of paper from a suspension containing cellulosic fibers, and optional fillers, comprising adding to the suspension drainage and retention aids comprising a cationic organic polymer and anionic microparticulate material, forming and dewatering the suspension on a wire, wherein the cationic organic polymer has a non-aromatic hydrophobic group. The invention further relates to a cationic vinyl addition polymer comprising in polymerized form at least one non-cationic monomer having a non-aromatic hydrophobic group and at least one cationic monomer.Type: ApplicationFiled: March 11, 2002Publication date: October 3, 2002Inventors: Hans Hallstrom, Rein Sikkar, Oliver Struck
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Patent number: 6458244Abstract: The present invention provides a synthetic fiber paper, the synthetic fiber paper comprises poly (phenylene terephthal amide) fiber, polyethylene glycol terephthalate fiber and powdered mica. The synthetic fiber paper has high-temperature resistance, high strength, low-deformability, resistivity against fire, burning resistance, resistance to chemical corrosion and excellent property of electric insulation, it can be widely applied in the field of mechano-electronics product, aviation, aerospace, military project for national defence, high-tech areas for civil use, high-voltage equipment, high-temperature circumstance as insulting material, it often can be used in composite materials with special use as structural material. The present invention also provides a process for preparing this synthetic fiber paper.Type: GrantFiled: January 20, 2000Date of Patent: October 1, 2002Assignee: Sichuan Foreign Economic Relations & Trade CorporationInventors: Xingli Wang, Shiyi Tao
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Patent number: 6454902Abstract: A process for making paper comprising forming a cellulosic suspension, flocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet, wherein the cellulosic suspension is flocculated by addition of a water soluble polymer which is selected from a) a polysaccharide or b) a synthetic polymer of intrinsic viscosity at least 4 dl/g and then reflocculated by a subsequent addition of a reflocculating system, wherein the reflocculating system comprises i) a siliceous material and ii) a water soluble polymer. In one aspect the siliceous material is added prior to or simultaneous with the water soluble polymer. In an alternative for the water soluble polymer is anionic and added prior to the siliceous material.Type: GrantFiled: November 2, 2000Date of Patent: September 24, 2002Assignee: Ciba Specialty Chemicals Water Treatments Ltd.Inventor: Gordon Cheng I Chen
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Patent number: 6451170Abstract: Starch compositions, including cationic crosslinked starches, and methods of using those starches in papermaking are disclosed. In particular, a cationized crosslinked starch and use of the starch in the wet end system of a paper machine is disclosed. The starch compositions of the disclosure are particularly adapted for customization for specific wet end systems, and allow for modification to correspond to variations in the wet end of the papermaking machine.Type: GrantFiled: August 10, 2000Date of Patent: September 17, 2002Assignee: Cargill, IncorporatedInventors: Kevin Ray Anderson, David Edward Garlie
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Patent number: 6451169Abstract: This invention concerns a method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a structurally rigid polymeric coagulant and an effective flocculating amount of a flocculant and a microparticle.Type: GrantFiled: December 20, 2000Date of Patent: September 17, 2002Assignee: Nalco Chemical CompanyInventors: William J. Ward, Andrew J. Dunham
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Patent number: 6444091Abstract: This invention concerns a method of increasing retention and drainage in a papermaking furnish comprising adding to the furnish an effective amount of a structurally rigid nonionic or anionic polymer.Type: GrantFiled: December 20, 2000Date of Patent: September 3, 2002Assignee: Nalco Chemical CompanyInventors: William J. Ward, Andrew J. Dunham, Phillip W. Carter, Andrei S. Zelenev
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Publication number: 20020117281Abstract: A method for forming an abrasion resistant sheet which comprises forming a web of cellulosic fibers on a papermaking machine and applying a slurry including an encapsulated abrasion-resistant grit to the upper surface of the web on the papermaking machine.Type: ApplicationFiled: February 27, 2001Publication date: August 29, 2002Inventors: Mark A. Johnson, John Benson, Mahendra Mehta, Steve Canary, Eric Girardin
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Publication number: 20020117277Abstract: A process for forming an abrasion resistant, printable sheet which comprises forming a web of cellulosic fibers on a papermaking machine and applying a slurry including an abrasion-resistant grit to the upper surface of the web on the papermaking machine and then applying a secondary web of cellulosic fibers over said grit to form a three layer overlay product.Type: ApplicationFiled: November 8, 2001Publication date: August 29, 2002Inventors: Mark A. Johnson, John Benson, Mahendra Mehta, Steve Canary, Eric Girardin
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Patent number: 6416625Abstract: In the manufacturing method of fluoro based polymer composite boards of the invention, which provides a fast process and high efficiency, a suitable amount of water soluble organic solvent is added to a fluoro based polymer suspension during the process of mixing ceramic powder and/or glass fiber to the fluoro based polymer suspension in order to improve the coagulation of the fluoro based polymer and ceramic powder, and to reduce the gelling time. During the process of mixing ceramic powder and/or glass fiber, the fluoro based polymer suspension and the organic solvent, a suitable amount of water can be added to control the ratio between the water and the organic solvent obtained from the mixture. The gelling time of the mixture can thus be reduced. By controlling the ratio between the water and the organic solvent obtained from the mixture, there is still enough time to allow homogeneous mixing after the gelling speed is increased.Type: GrantFiled: November 16, 2001Date of Patent: July 9, 2002Assignee: Industrial Technology Research InstituteInventors: Shian-Yih Wang, Yung-Chih Chen, Lung-Cheng Cheng, Shi-Ing Huang, Chun-Sheng Chen
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Patent number: 6416626Abstract: A polyethylene glycol-containing paper is described. The paper includes polyethylene glycol (PEG) having an average molar mass in the range of from about 30,000 to about 50,000. In one embodiment, polyethylene glycol is incorporated into the paper during the paper's formation. In another embodiment, a polyethylene glycol-coated paper is provided. Methods for forming polyethylene glycol-containing papers are also described.Type: GrantFiled: September 28, 2000Date of Patent: July 9, 2002Assignee: Weyerhaeuser CompanyInventors: David W. Park, Michael J. Dougherty
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Patent number: 6413373Abstract: The present invention relates to a process for easily and efficiently producing silica particles having a narrow particle size distribution and a high porosity from inexpensive starting materials such as sodium silicate. The silica particles of the present invention can be obtained in the form of a slurry containing them by (1) forming a slurry by mixing first particles difficultly soluble in an alkali and soluble in an acid, with an aqueous alkali silicate solution to form a first slurry containing the first particles, (2) neutralizing the first slurry with a mineral acid to prepare a second slurry containing second particles wherein silica is deposited on the first particles, and (3) adding a mineral acid to the second slurry to dissolve the first particles from the second particles, to prepare a third slurry containing silica particles.Type: GrantFiled: April 12, 2001Date of Patent: July 2, 2002Assignee: OJI Paper Co., Ltd.Inventors: Masashi Matsuda, Masasuke Watanabe, Hitoshi Okada, Motohide Wada, Osamu Kitao
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Patent number: 6406594Abstract: Composite products having mineral networks polymerized about cellulosic material and a method for making such products are described. One embodiment of the composite product comprises a paper product having a polymerized mineral network, such as a silica/silicate network around, throughout and/or about the cellulosic material instead of having isolated particles of filler material deposited onto, or purposefully bonded to, the cellulosic material. One embodiment of the method comprises providing a mixture comprising cellulosic material, a Group I metal silicate and a Group II metal base or salt. The mixture is then carbonated to produce a product comprising precipitated carbonate filler material and a polymerized mineral network about the cellulosic material. This product is then formed into paper products wherein the ash content can be substantially greater than conventional paper products while maintaining suitable strength properties.Type: GrantFiled: July 17, 1998Date of Patent: June 18, 2002Assignee: Boise Cascade CorporationInventors: Richard F. Palmer, Mike S. D. Juang, James S. Johnson, Barbara R. Atha, David T. Lee, Larry L. Malcom
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Publication number: 20020066540Abstract: According to the present invention a process is provided for making paper or paper board comprising forming a cellulosic suspension, flocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet,Type: ApplicationFiled: October 10, 2001Publication date: June 6, 2002Inventors: Gordon Cheng I. Chen, Gary Peter Richardson
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Publication number: 20020062938Abstract: A process for the production of paper from an aqueous suspension containing cellulosic fibers, and optional fillers, which comprises draining the suspension to obtain a paper web and subjecting the obtained paper web to impulse pressing by passage through at least one press nip having at least one heated roll which is in contact with the web and heated to a temperature above 100° C., wherein a chemical system comprising a polymer component and micro- or nanoparticles are added to the suspension or the paper web before the paper web passes the press nip of the impulse unit.Type: ApplicationFiled: September 20, 2001Publication date: May 30, 2002Inventors: Caroline Westman, Tom Lindstrom, Janne Laine, Maria Norell
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Patent number: 6395134Abstract: A process of making paper or paper board comprising forming a cellulosic suspension, flocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet, characterised in that the suspension is flocculated using a flocculation system comprising a siliceous material and an anionic branched water soluble polymer that has been formed from water soluble ethylenically unsaturated anionic monomer or monomer blend and branching agent and wherein the polymer has (a) intrinsic viscosity above 1.5 dl/g and/or saline Brookfield viscosity of above about 2.0 mPa.s and (b) rheological oscillation value of tan delta at 0.005 Hz of above 0.7 and/or (c) deionised SLV viscosity number which is at least three times the salted SLV viscosity number of the corresponding unbranched polymer made in the absence of branching agent.Type: GrantFiled: November 2, 2000Date of Patent: May 28, 2002Assignee: Ciba Specialty Chemicals Water Treatments Ltd.Inventors: Gordon Cheng I Chen, Gary Peter Richardson
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Patent number: 6379500Abstract: An aqueous silica-based sol comprising a nitrogen-containing organic compound and silica-based particles with a specific surface area of at least 300 square meters per gram of silica. The invention further relates to a process for the production of an aqueous silica-based sol comprising a nitrogen-containing organic compound which comprises incorporating a nitrogen-containing organic compound into a silica-based sol containing silica-based particles with a specific surface area of at least 300 square meters per gram of silica. The invention also relates to the use of an aqueous silica-based sol comprising a nitrogen-containing organic compound and silica-based particles with a specific surface area of at least 300 square meters per gram of silica as a flocculating agent in the production of pulp and paper and in water purification.Type: GrantFiled: December 19, 2000Date of Patent: April 30, 2002Assignee: Akzo Nobel NVInventors: Peter Greenwood, Magnus Olof Linsten, Hans E. Johansson-Vestin
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Patent number: 6372089Abstract: Disclosed are stable, aqueous colloidal silicas having surface area of greater than 700 m2/g and S-values of from 20-50. These colloidal silicas do not require treatment with surface treatment agents such as aluminum to achieve stability. These colloidal silica aquasols can be produced and stored at concentrations of greater than 7 percent by weight SiO2 solids, and even as high as 15 percent by weight solids or higher, and remain stable at room temperature for at least 30 days compared to art-known silica aquasols. These colloidal silica sols demonstrate advantageously improved performance over art-known colloidal silica sols in applications such as in drainage and retention in papermaking processes. Also disclosed are processes for making aqueous colloidal silicas of the invention and the use of such colloidal silicas in papermaking processes.Type: GrantFiled: February 14, 2000Date of Patent: April 16, 2002Assignee: Nalco Chemical CompanyInventors: Bruce A. Keiser, Maureen B. Nunn, Cheng-Sung Huang, Dennis I. MacDonald
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Patent number: 6372806Abstract: Disclosed are stable, aqueous colloidal silicas having surface area of greater than 700 m2/g and S-values of from 20-50. These colloidal silicas do not require treatment with surface treatment agents such as aluminum to achieve stability. These colloidal silica aquasols can be produced and stored at concentrations of greater than 7 percent by weight SiO2 solids, and even as high as 15 percent by weight solids or higher, and remain stable at room temperature for at least 30 days compared to art-known silica aquasols. These colloidal silica sols demonstrate advantageously improved performance over art-known colloidal silica sots in applications such as in drainage and retention in papermaking processes. Also disclosed are processes for making aqueous colloidal silicas of the invention and the use of such colloidal silicas in papermaking processes.Type: GrantFiled: February 14, 2000Date of Patent: April 16, 2002Assignee: Nalco Chemical CompanyInventors: Bruce A. Keiser, Maureen B. Nunn, Cheng-Sung Huang, Dennis L. MacDonald
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Publication number: 20020040773Abstract: The present invention relates to a process for easily and efficiently producing silica particles having a narrow particle size distribution and a high porosity from inexpensive starting materials such as sodium silicate. The silica particles of the present invention can be obtained in the form of a slurry containing them by (1) forming a slurry by mixing first particles difficultly soluble in an alkali and soluble in an acid, with an aqueous alkali silicate solution to form a first slurry containing the first particles, (2) neutralizing the first slurry with a mineral acid to prepare a second slurry containing second particles wherein silica is deposited on the first particles, and (3) adding a mineral acid to the second slurry to dissolve the first particles from the second particles, to prepare a third slurry containing silica particles.Type: ApplicationFiled: April 12, 2001Publication date: April 11, 2002Applicant: Oji Paper Co., Ltd.Inventors: Masashi Matsuda, Masasuke Watanabe, Hitoshi Okada, Motohide Wada, Osamu Kitao
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Patent number: 6361652Abstract: The invention comprises a borosilicate retention aid composition and a method for improving the production of paper by addition of the borosilicate. The borosilicate may be utilized in conjunction with a high molecular weight synthetic flocculant and/or starch, with or without the addition of a cationic coagulant. The borosilicate material is preferably a colloidal borosilicate. Methods for the preparation of the borosilicate material are disclosed.Type: GrantFiled: April 22, 2001Date of Patent: March 26, 2002Assignee: Nalco Chemical CompanyInventors: Bruce A. Keiser, James E. Whitten
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Patent number: 6361653Abstract: The invention comprises a borosilicate retention aid composition and a method for improving the production of paper by addition of the borosilicate. The borosilicate may be utilized in conjunction with a high molecular weight synthetic flocculent and/or starch, with or without the addition of a cationic coagulant. The borosilicate material is preferably a colloidal borosilicate. Methods for the preparation of the borosilicate material are disclosed.Type: GrantFiled: April 22, 2001Date of Patent: March 26, 2002Assignee: Nalco Chemical CompanyInventors: Bruce A. Keiser, James E. Whitten
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Patent number: 6358364Abstract: The invention comprises a borosilicate retention aid composition and a method for improving the production of paper by addition of the borosilicate. The borosilicate may be utilized in conjunction with a high molecular weight synthetic flocculant and/or starch, with or without the addition of a cationic coagulant. The borosilicate material is preferably a colloidal borosilicate. Methods for the preparation of the borosilicate material are disclosed.Type: GrantFiled: April 22, 2001Date of Patent: March 19, 2002Assignee: Nalco Chemical CompanyInventors: Bruce A. Keiser, James E. Whitten
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Patent number: 6315824Abstract: The present invention relates to a stabilized emulsified or dispersed composition comprising a hydrophobic phase and an aqueous phase, the composition being stabilized by a cationic colloidal coacervate stabilizing agent, the coacervate stabilizing agent comprising an anionic component and a cationic component, the anionic and cationic components being present in a proportion such that the composition has a zeta potential of at least about 20 millivolts. The hydrophobic phase is preferably a non-rosin sizing agent, including a reactive or nonreactive sizing agent, although mixtures of rosin and non-rosin sizing agents can form stable emulsions or dispersions using the coacervate of the invention. Methods of making and using the stable emulsions or dispersions are also disclosed, as is sized paper made using an emulsified or dispersed sizing agent stabilized with the coacervate stabilizing agent of the invention.Type: GrantFiled: December 7, 1998Date of Patent: November 13, 2001Inventor: Rodrigue V. Lauzon
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Publication number: 20010030032Abstract: The invention comprises a borosilicate retention aid composition and a method for improving the production of paper by addition of the borosilicate. The borosilicate may be utilized in conjunction with a high molecular weight synthetic flocculant and/or starch, with or without the addition of a cationic coagulant. The borosilicate material is preferably a colloidal borosilicate. Methods for the preparation of the borosilicate material are disclosed.Type: ApplicationFiled: April 22, 2001Publication date: October 18, 2001Inventors: Bruce A. Keiser, James E. Whitten
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Patent number: 6296737Abstract: The invention relates to cellulose fluff pulp products that are debondable into fluff with markedly lower energy input, to a process for making the products, and to absorbent products using the fluff Most of the pulp products show no reduction in liquid absorbency rate from that of untreated fiber and significantly higher rates than pulps treated with the usual debonding agents. The products are made by adhering fine non-cellulosic particles to the fiber surfaces using a retention aid. The fiber is preferably treated with the retention aid in an aqueous suspension for a sufficient time so that the retention aid is substantively bonded with little or none left free in the water. The fine particulate additive is then added and becomes attached and uniformly distributed over the fiber surfaces with very little particle agglomeration occurring. The fiber is most usually not refined or only very lightly refined before sheeting.Type: GrantFiled: June 12, 2000Date of Patent: October 2, 2001Assignee: Weyerhaeuser CompanyInventors: Jian Wu, Hugh West, Terry M. Grant
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Publication number: 20010023752Abstract: The invention comprises a borosilicate retention aid composition and a method for improving the production of paper by addition of the borosilicate. The borosilicate may be utilized in conjunction with a high molecular weight synthetic flocculant and/or starch, with or without the addition of a cationic coagulant. The borosilicate material is preferably a colloidal borosilicate. Methods for the preparation of the borosilicate material are disclosed.Type: ApplicationFiled: April 22, 2001Publication date: September 27, 2001Inventors: Bruce A. Keiser, James E. Whitten
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Publication number: 20010023753Abstract: The invention comprises a borosilicate retention aid composition and a method for improving the production of paper by addition of the borosilicate. The borosilicate may be utilized in conjunction with a high molecular weight synthetic flocculant and/or starch, with or without the addition of a cationic coagulant. The borosilicate material is preferably a colloidal borosilicate. Methods for the preparation of the borosilicate material are disclosed.Type: ApplicationFiled: April 22, 2001Publication date: September 27, 2001Inventors: Bruce A. Keiser, James E. Whitten
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Patent number: 6290815Abstract: The invention relates to a paper sheet containing grit particles giving it, in use, a high abrasion resistance. It is characterized in that it contains grit particles coated in a non-abrasive material, in particular in a polymer. According to the invention, the particles are chosen from alumina, silica, boron nitride, silicon carbide, titanium carbide, tungsten carbide, zirconium oxide, cerium oxide, glass and ceramic particles, or mixtures thereof. The invention also relates to the laminates containing it, as well as to the processes for manufacturing the sheets and the laminates.Type: GrantFiled: September 3, 1997Date of Patent: September 18, 2001Assignee: Arjo Wiggins S.A.Inventors: Henri Magnin, Claude Perrin, Pierre Caulet