Acrylamide Containing Patents (Class 162/168.3)
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Patent number: 8852400Abstract: The present disclosure provides for a method of preparing and using an emulsion for treating a papermaking process. The emulsion is an oil-in-water emulsion of alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer. The method comprises adding an oil-in-water emulsion to the papermaking process; wherein the oil-in-water emulsion comprises alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer; and wherein the oil-in-water emulsion is added in an amount sufficient to improve sizing of the paper produced by the papermaking process. The primary or secondary amine may be a secondary amine comprising diallylamine, and the polymer may be a diallylamine-acrylamide copolymer.Type: GrantFiled: November 15, 2012Date of Patent: October 7, 2014Assignee: Ecolab USA Inc.Inventors: Michael R St. John, David J Castro, Mei Liu
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Publication number: 20140284011Abstract: The invention relates to a method for manufacturing paper, paperboard or cardboard comprising the steps of (a) pulping an aqueous cellulosic material containing a starch; (b) preventing at least a portion of the starch from being microbially degraded by treating the aqueous cellulosic material containing the starch with one or more biocides; and (h) adding a dry and/or wet strength polymer to the cellulosic material.Type: ApplicationFiled: August 24, 2012Publication date: September 25, 2014Applicant: ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLCInventors: Ludwig Krapsch, Christopher John McGregor, Jean Victor Mallard de La Varende
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Patent number: 8840760Abstract: The object of the process of the invention is to increase the retention of starch in the sheet of paper in order to reduce operating costs and increase the physical characteristics of the paper. To that end, it has been envisaged that trivalent cationic salts are added, metered into the slurry or in the process for obtaining starch in powder form or by mixing a percentage of trivalent salts in powder form with the starch in powder form, seeking the solution of said salts in the slurry, so that they dissolve during the dispersion of the slurry in the process for obtaining the sheet of paper. Organic polymers such as polyacrylamides, polyvinylamides and polydadmacs could optionally be applied in addition to said salts.Type: GrantFiled: October 2, 2009Date of Patent: September 23, 2014Assignee: Oriol Gracia GrandiaInventor: Oriol Gracia Grandia
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Publication number: 20140262090Abstract: Disclosed herein are methods of increasing retention and drainage in papermaking processes using high molecular-weight, water-soluble polymers.Type: ApplicationFiled: March 10, 2014Publication date: September 18, 2014Applicant: Ecolab USA Inc.Inventors: Brett Brotherson, Peter E. Reed, Xiaojin Harry Li, William J. Andrews, Mingli Wei
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Patent number: 8834677Abstract: The present invention provides tissue products having an MD/CD Tensile Ratio less than about 0.95, yet relatively high geometric tensile strength, such as geometric mean tensile strengths greater than about 1500 g/3? and more preferably greater than about 2000 g/3?. The combination of a tough, yet relatively supple sheet is preferably achieved by subjecting the embryonic web to a speed differential as it is passed from one fabric in the papermaking process to another, commonly referred to as rush transfer.Type: GrantFiled: January 24, 2014Date of Patent: September 16, 2014Assignee: Kimberly-Clark Worldwide, Inc.Inventors: Maurizio Tirimacco, Erin Ann McCormick, Angela Ann Johnston, Mark John Hassman
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Patent number: 8834680Abstract: The present invention relates to a filler composition comprising a) a filler, b) a cationic inorganic compound, c) a cationic organic compound, and d) an anionic polysaccharide, wherein the filler is present in an amount of at least about 1% by weight, based on the total weight of the composition, the anionic polysaccharide is present in an amount of about 1 to about 100 kg/ton, based on the weight of filler, and wherein the composition is substantially free from fibers.Type: GrantFiled: July 14, 2008Date of Patent: September 16, 2014Assignee: AKZO Nobel N.V.Inventors: Patrik Simonson, Michael Persson
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Publication number: 20140216671Abstract: A modified filler composition used in papermaking is provided. The modified filler composition contains microfibrillated cellulose, and filler having negative charge, and a cationic polymer.Type: ApplicationFiled: January 21, 2014Publication date: August 7, 2014Applicant: Goldeast Paper (Jiangsu) Co., LtdInventors: YAN FENG, DEQUANJIANG
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Patent number: 8790494Abstract: The invention provides a three layered reprographic paper having improved strength, stiffness and curl resistance properties, and a method for making same. The paper has a central core layer made largely of cellulose and bulked with a bulking agent such as a diamide salt. A starch-based metered size press coating is pressed on both sides of the core layer, wherein the starch has a high solid content. The coating forms a three layered paper having an I-beam arrangement with high strength outer layers surrounding a low density core.Type: GrantFiled: May 31, 2013Date of Patent: July 29, 2014Assignee: International Paper CompanyInventors: Agne Swerin, Jay C. Song, Ladislav Bednarik, Peter F. Lee, Michael C. Herman, Sen Yang
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Patent number: 8790493Abstract: The present invention relates to a process for producing paper which comprises: (vii) providing an aqueous suspension comprising cellulosic fibers, (viii) adding to the suspension after all points of high shear a first polymer being a cationic polymer having a charge density above 2.5 meq/g; a second polymer, and a third polymer being an organic or inorganic anionic polymer; and (ix) dewatering the obtained suspension to form paper.Type: GrantFiled: October 10, 2012Date of Patent: July 29, 2014Assignee: Akzo Nobel N.V.Inventors: Fredrik Solhage, Joakim Carlén, Birgitta Johansson
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Patent number: 8784611Abstract: The invention relates to a process for the production of paper or board comprising: adding a retention system to a stream of stock entering a paper machine head box, directing the stream of stock to a wire, de watering the stream of stock on the wire to form a paper web, and drying the paper web, wherein the retention system comprises a water-soluble cationic polymer, and nanocellulose acting like a micro particle, wherein the nanocellulose is added in an amount of less than 1% as active substance based on dry solids weight of the stock.Type: GrantFiled: November 3, 2010Date of Patent: July 22, 2014Assignee: Kemira OYJInventors: Ari Juppo, Ulf Stenbacka
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Patent number: 8778140Abstract: A method of preparing a stable dispersion of flocculated filler particles for use in papermaking processes comprises use of microparticle prior to, simultaneous to, and/or after addition of a first flocculating agent to an aqueous dispersion of filler particles, followed by addition of a second flocculating agent to the dispersion and further optional shearing of the resultant filler flocs to the desired particle size resulting in shear resistant filler flocs with a defined and controllable size distribution. In addition, a neutralizing coagulant can be added to the dispersion to partially or completely neutralize the charge of the filler before the microparticle and/or the first flocculating agent is added.Type: GrantFiled: November 1, 2012Date of Patent: July 15, 2014Assignee: Nalco CompanyInventors: Weiguo Cheng, Katherine M Broadus, Dorota Smoron, Shawnee M Wilson
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Patent number: 8771469Abstract: This invention relates to resins useful for drainage in papermaking and the process of making paper using the resins. In particular the invention relates to glyoxalated copolymers of acrylamide containing significant amounts of cationic comonomer.Type: GrantFiled: November 8, 2010Date of Patent: July 8, 2014Assignee: Hercules IncorporatedInventors: Shane Cyr, Henk Bakker, Willem Marinus Stevels, Ronald Richard Staib
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Patent number: 8771467Abstract: A carrier-tape base paper making method and the base paper made thereby fall into the technical field of papermaking. According to performance requirements, the base paper is made through pulp conditioning and papermaking, in which different pulping and auxiliary materials for surface, intermediate and bottom layers are added. The method includes such steps as beating, conditioning, papermaking, calendering and reeling. The carrier-tape base paper features high strength, perfect waterproof and bonding performance, limited physical damages to electronic elements and satisfactory resilience.Type: GrantFiled: March 12, 2012Date of Patent: July 8, 2014Assignee: Zhejiang Jiemei Electronic & Technology Co., LtdInventor: Junyun Fang
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Publication number: 20140174683Abstract: The present invention relates to a process for producing paper which comprises: (i) providing an aqueous suspension comprising cellulosic fibres, (ii) adding to the suspension after the last point of high shear subsequent a centri-screen: (a) a first anionic component which is a water-soluble anionic anionic polysaccharide; (b) a second anionic component which is a water-dispersible or branched acrylamide-based polymer; and (c) a third anionic component which is an anionic siliceous material comprising an anionic silica-based polymer comprising anionic silica-based particles having a specific surface area within the range of from 100 to 1700 m2/g (iii) dewatering the obtained suspension to form paper.Type: ApplicationFiled: October 11, 2013Publication date: June 26, 2014Applicant: AKZO NOBEL N.V.Inventors: Johan NYANDER, Fredrik SOLHAGE
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Patent number: 8753478Abstract: A composition comprising one or more high molecular weight resins and one or more low molecular weight resins in a ratio of about 1:99 to about 99:1 based on polymer actives, wherein said high molecular weight resins are selected from the group consisting of glyoxylated polyacrylamide, crosslinked polyaminoamide and polyaminoamide-epihalohydrin resins having a molecular weight of about 100,000 to about 5,000,000 Dalton and the low molecular weight resins are selected from the group consisting of glyoxylated polyacrylamide, crosslinked polyaminoamide and polyaminoamide-epihalohydrin resins having a molecular weight of less than about 100,000 Dalton and wherein the mole ratio of epihalohydrin to secondary nitrogen atoms in the high and low molecular weight polyaminoamide-epihalohydrin resins is less than about 0.5. and use of the composition for creping paper webs.Type: GrantFiled: November 28, 2007Date of Patent: June 17, 2014Assignee: Nalco CompanyInventors: Vladimir A. Grigoriev, Gary S. Furman
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Patent number: 8753479Abstract: The invention relates to a process for the production of paper, card and board, including the steps of draining a filler-containing paper stock, having a certain fibrous concentration and containing at least one water-soluble amphoteric copolymer, with sheet formation in a wire section, then pressing the paper in a press section, diluting the paper stock to a fibrous concentration in the range from 5 to 15 g/l, draining the diluted paper stock to form a sheet, and then pressing the sheet in the press section to a solids content G(x) wt % or greater, such that G(x) computes according to: G(x)=48+(x?15)·0.4, where x is the numerical value of a filler content of the dry paper, card or board (in wt %), and G(x) is a numerical value of the minimal solids content (in wt %) to which the sheet is pressed.Type: GrantFiled: June 19, 2012Date of Patent: June 17, 2014Assignee: BASF SEInventors: Anton Esser, Hans-Joachim Haehnle
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Patent number: 8753480Abstract: The current invention includes a composition having stability additives of selected inorganic salts and/or organic incorporated into an aldehyde-functionalized polymer product. The stability additive can be post added to the finished polymer product, added to the reaction vessel prior to inducing functionalization of the non-functionalized polymer, or added at any stage during the functionalization reaction. Methods for forming the composition and using the composition to produce a cellulosic fiber-based medium are also disclosed.Type: GrantFiled: October 12, 2012Date of Patent: June 17, 2014Assignee: Nalco CompanyInventors: Heinrich E. Bode, Michael R. St. John, Mei Liu, Robert M. Lowe
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Patent number: 8747617Abstract: A method of preparing a stable dispersion of flocculated filler particles for use in papermaking processes comprises sequential addition of a first flocculating agent to an aqueous dispersion of filler particles followed by shearing of the dispersion, followed by addition of a second flocculating agent to the dispersion and further shearing of the resultant filler flocs to the desired particle size resulting in shear resistant filler flocs with a defined and controllable size distribution. In addition, a neutralizing coagulant can be added to the dispersion to partially or completely neutralize the charge of the filler before the first flocculating agent is added.Type: GrantFiled: April 18, 2012Date of Patent: June 10, 2014Assignee: Nalco CompanyInventors: Weiguo Cheng, Ross T. Gray
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Publication number: 20140124155Abstract: The process of the present invention concerns manufacturing paper and paperboard employing two polymeric retention aids. These two polymeric retention aids should be added to the low consistency suspension, often referred to as the thin stock. The first polymeric retention aid is a water-soluble cationic polymer exhibiting an intrinsic viscosity of at least 6 dl/g. The second polymeric retention aid is a water-soluble cationic polymer exhibiting an intrinsic viscosity of between 4 and 9 dl/g. The cationic charge density of the second polymeric retention aid should be higher than that of the first polymeric retention aid. The process is particularly suitable for the manufacture of fine paper or multiply packaging paper which often contains filler.Type: ApplicationFiled: June 20, 2012Publication date: May 8, 2014Applicant: BASF SEInventor: Christian Jehn-Rendu
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Publication number: 20140116635Abstract: Methods of making paper or paperboard having enhanced dry strength are provided. An enzyme and a polymer including at least one of a cationic water-soluble polymer and an amphoteric water-soluble polymer can be added to a papermaking pulp to yield a treated pulp. The treated pulp can then be formed into paper or paperboard having a dry strength greater than paper or paperboard formed from papermaking pulp without the addition of the enzyme and polymer. Any suitable enzyme can be used, for example, a laccase or a cellulase. Any suitable polymer can be used. For example, at least one of a glyoxylated polyacrylamide (gPAM), a polyvinylamine, a decarboxylated polyacrylamide, and a dimethylamine-epichlorohydrin (epi-DMA).Type: ApplicationFiled: September 11, 2013Publication date: May 1, 2014Applicant: Buckman Laboratories International, Inc.Inventors: Rita De Cassia Bortoto Porto, Erika Barbosa Neves Graminha, Juliano Lopes Dos Santos, Tiago Pereira Goncalves
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Patent number: 8696869Abstract: Stable, coating compositions useful for enhancing the dry strength of paper are disclosed. The compositions comprise an aqueous solution of nearly neutral polymer, cationic polymer and starch. Method of using the coating composition to improve the dry strength of paper is also disclosed.Type: GrantFiled: November 5, 2010Date of Patent: April 15, 2014Assignee: Hercules IncorporatedInventors: Sachin Borkar, Marc C. Putnam
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Patent number: 8673117Abstract: A degrading agent composition for use in manufacturing a tissue product generally includes a degrading agent, a degradation inhibiting carrier, and a non-ionic surfactant. The non-ionic surfactant stabilizes the viscosity of the composition as a function of time. The degrading agent composition can be used in combination with a temporary wet strength agent to produce a tissue product exhibiting high initial wet tensile strength and desirable decay properties. Processes for forming the tissue product and pumpable fluids containing the degrading agent composition are also disclosed.Type: GrantFiled: September 30, 2010Date of Patent: March 18, 2014Assignee: Kemira OyjInventors: Scott Rosencrance, Yuping Luo, Vladimir Grigoriev
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Patent number: 8647472Abstract: The invention provides a method of producing paper with a higher proportion of mineral filler particles than is otherwise be possible without the expected loss in paper strength by preflocculating the filler particles. The method allows for the use of the greater amount of filler particles by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a strength additive. The strength additive holds the paper fibers together tightly and is not wasted on the filler particles.Type: GrantFiled: March 19, 2010Date of Patent: February 11, 2014Assignee: Nalco CompanyInventors: Weiguo Cheng, Ross T. Gray
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Patent number: 8636875Abstract: A process is disclosed for the production of paper with enhanced dry strength comprising adding to the wet end of a paper machine, (a) a glyoxalated acrylamide-containing polymer and (b) a cationic aqueous dispersion polymer. Guidelines for the properties of the polymers that make this coadditive system effective are established. Polymer properties discussed include molecular weight, cationic charge, polymer composition and functionalization, and relative additive amounts.Type: GrantFiled: January 20, 2012Date of Patent: January 28, 2014Assignee: Hercules IncorporatedInventor: Jonathan M. McKay
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Patent number: 8613832Abstract: The present invention relates to a drainage and retention aid composition which comprises: (d) a first anionic component which is a water-soluble anionic organic polymer; (e) a second anionic component which is a water-dispersible or branched anionic organic polymer; and (f) a third anionic component which is an anionic siliceous material; wherein the first, second and third anionic components are present in a dry matter content of from 0.01 to 50% by weight.Type: GrantFiled: February 15, 2012Date of Patent: December 24, 2013Assignee: Akzo Nobel N.V.Inventors: Johan Nyander, Fredrik Solhage
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Method of making a fabric-creped absorbent cellulosic sheet with improved dispensing characteristics
Patent number: 8603296Abstract: A method of making a fabric-creped absorbent cellulosic sheet with improved dispensing characteristics. The method includes compactively dewatering a papermaking furnish to form a nascent web, applying the nascent web to a translating transfer surface, fabric-creping the web from the transfer surface at a consistency of from about 30 to about 60 percent utilizing a patterned creping fabric, the fabric-creping step occurring under pressure in a fabric creping nip defined between the transfer surface and the creping fabric, wherein the fabric is traveling at a fabric speed that is slower than the speed of the transfer surface, the web being creped from the transfer surface and transferred to the creping fabric, adhering the web to a drying cylinder with a resinous adhesive coating composition, drying the web on the drying cylinder to form a dried web, and peeling the dried web from the drying cylinder.Type: GrantFiled: February 22, 2012Date of Patent: December 10, 2013Assignee: Georgia-Pacific Consumer Products LPInventors: Steven L. Edwards, Guy H. Super, Stephen J. McCullough, Ronald R. Reeb, Hung Liang Chou, Kang Chang Yeh, John H. Dwiggins, Frank D. Harper -
Patent number: 8597467Abstract: A cationic copolymer is obtained by the Hofmann rearrangement (also referred to as the Hofmann degradation reaction) in aqueous solution in the presence of an alkaline-earth and/or alkali hydroxide and an alkaline-earth and/or alkaline hypohalide, on a base copolymer comprising at least one nonionic monomer selected from the group comprising acrylamide (and/or methacrylamide), N,N-dimethylacrylamide and/or acrylonitrile The copolymer is branched after the Hofmann rearrangement, in the presence of at least one polyfunctional branching agent, and is soluble in water.Type: GrantFiled: July 11, 2008Date of Patent: December 3, 2013Assignee: S.P.C.M. SAInventors: Christian Jehn-Rendu, Rene Hund, Muttalif Duong
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Patent number: 8518216Abstract: Methods for making a heterogeneous polymer blend comprising one or more anionic polymers, one or more cationic polymers, and one or more non-ionic polymers, which method comprises (a) adding to a non-neutral solution a first amount of polymerization initiator and one or more anionic or cationic monomers, wherein each monomer has the same charge; (b) a second amount of the polymerization initiator and one or more non-ionic monomers; (c) adding a third amount of the polymerization initiator and one or more ionic monomers that are oppositely charged from the monomers of (a); adding stepwise, a fourth amount of the polymerization initiator to react any residual monomer, and (e) neutralizing the resulting polymer blend. Also claimed are heterogeneous polymer blends containing polymers formed from one or more anionic, cationic, and non-ionic monomers, either polymerized in situ or separately and then combined.Type: GrantFiled: November 10, 2011Date of Patent: August 27, 2013Assignee: Hercules IncorporatedInventors: Frank J. Sutman, Joseph Mahoney
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Patent number: 8512519Abstract: Sulfopolyester thermoplastic resins provide advantages in papermaking processes and in paper products including paperboard. Improvements in wet strength and dry strength of paper products are achieved by addition of sulfopolyester thermoplastic resins and cationic strength additives during the paper making process. The use of sulfopolyester thermoplastic resins in paper products also significantly enhances the repulpability of the paper.Type: GrantFiled: April 22, 2010Date of Patent: August 20, 2013Assignee: Eastman Chemical CompanyInventors: Rakesh Kumar Gupta, Daniel William Klosiewicz, Melvin Glenn Mitchell, Marvin Lynn Mitchell
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Patent number: 8480853Abstract: Enhancement of papermaking drainage and retention properties of aqueous cellulosic suspensions used for production of paper or paper board with a retention/drainage additive system including ionic crosslinked acrylic acid-acrylate copolymer microparticles is described. Paper and paperboard products made with these copolymer microparticles are also described.Type: GrantFiled: October 26, 2011Date of Patent: July 9, 2013Assignee: Buckman Laboratories International, Inc.Inventor: Weiping Ban
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Patent number: 8460414Abstract: Disclosed is a polishing slurry which enables to suppress damages to an under layer while securing an adequate polishing rate. The polishing slurry contains a resin (A) having an amide group and an organic resin (B).Type: GrantFiled: April 14, 2006Date of Patent: June 11, 2013Assignee: Mitsui Chemicals, Inc.Inventors: Akinori Etoh, Setsuko Oike, Tomokazu Ishizuka, Shigeharu Fujii, Kiyotaka Shindo
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Publication number: 20130139986Abstract: A method for manufacturing a sheet of paper and/or board having improved retention and drainage properties is provided, according to which, before the formation of the sheet and/or board, at least two retention aids are added to the fibrous suspension. These two retention aids are a main retention aid corresponding to a (co)polymer having a cationic charge density above 2 meq/g, obtained by the Hofmann degradation reaction, and a secondary retention aid corresponding to a water-soluble or water-swellable polymer having an anionic charge density above 0.1 meq/g. The main retention aid is introduced into the fibrous suspension in a proportion of 100 to 800 g/t of dry pulp, and the secondary retention aid is introduced into the fibrous suspension in a proportion of 50 to 800 g/t of dry pulp and has an intrinsic viscosity IV above 3 dl/g.Type: ApplicationFiled: January 30, 2013Publication date: June 6, 2013Inventors: Gatien Faucher, Rene Hund
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Patent number: 8454798Abstract: A method is described for making paper or paper board by applying a composition containing enzyme and cationic coagulant to papermaking pulp prior to paper forming to preferably improve drainage, retention, or both. Sheets of pulp from which paper or paperboard products are made with the method can exhibit excellent drainage, excellent retention of pulp fines, or both. The method also can be applied to other pulp treatments, such as waste water treatments. A system for making such treatments of paper furnish is also provided.Type: GrantFiled: April 14, 2011Date of Patent: June 4, 2013Assignee: Buckman Laboratories International, Inc.Inventors: Weiping Ban, Gary Headrick, Rosa M. Covarrubias
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Patent number: 8435382Abstract: Storage-stable glyoxalated polyacrylamide polymers and high solids aqueous compositions formulated with them are described. These glyoxalated polyacrylamide compositions can be used as additives for papermaking, providing paper with good dry and temporary wet strength, and increasing papermaking de-watering rates.Type: GrantFiled: June 13, 2008Date of Patent: May 7, 2013Assignee: Buckman Laboratories International, Inc.Inventors: Chen Lu, James Andrew Ward
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Anionic functional promoter and charge control agent with improved wet to dry tensile strength ratio
Patent number: 8425724Abstract: The invention relates to a composition comprising (a) a functional promoter comprising a water-soluble anionic polymer having a molecular weight of at least about 50,000 daltons and a molecular weight charge index value of at least about 10,000; (b) a cationic surfactant component; such that when the composition treats a fibrous substrate, in conjunction with a cationic strength agent, the treated fibrous substrate exhibits (i) a ratio of wet tensile strength to dry tensile strength ranging from about 1:5 to about 1:2 and (ii) an increase in a ratio of wet tensile strength to dry tensile strength of at least about 10%, as compared to when the fibrous substrate is treated with the functional promoter and without a surfactant. The invention also relates to a paper product made with such a system, and method for imparting wet strength to a paper product with the functional promoter.Type: GrantFiled: October 18, 2011Date of Patent: April 23, 2013Assignee: Kemira OyjInventors: Michael Ryan, William Brevard -
Patent number: 8414739Abstract: There is provided a filled paper containing a coated filler obtained by coating a filler with a acrylamide copolymer (composite PAM) comprising (A) an anionic polysaccharide and (B) a cationic and/or an amphoteric acrylamide copolymer. The composite PAM is obtained, for example, by mixing the component (A) and the component (B). Since the filler is treated with a combination of the components (A) and (B) different from each other in charge properties and structure, suitable coagulation effect can be attained and the coated filler has excellent affinity for pulp slurry. Therefore, even in the case of a highly filled paper, a large paper strengthening effect can be attained by using a small amount of the chemical agent.Type: GrantFiled: March 16, 2006Date of Patent: April 9, 2013Assignees: Harima Chemicals, Inc., Nippon Paper Industries Co., Ltd.Inventors: Yoshiharu Kimura, Takao Sezaki, Yuko Iijima, Koji Kutsuwa
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Patent number: 8388802Abstract: This invention relates to paper products and/or substrates suitable for being made and/or converted into wallboard tape; which also may be known as joint tape and/or drywall tape, having a pH of at least 7.0 and containing a plurality of cellulose fibers, a wet strength additive, an alkaline sizing agent, and an anionic promoter, as well as methods of making and using the same.Type: GrantFiled: April 5, 2012Date of Patent: March 5, 2013Assignee: International Paper CompanyInventors: Stephen A. Buzza, Dennis W. Anderson, Yufeng Xu, Bruce Richard McGaffin, Christopher Michael Wilson
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Patent number: 8349135Abstract: To effectively impart sizing performance to paper, while reducing the amounts of an internal sizing agent and aluminum sulfate, a papermaking additive comprises a mixture of an amphoteric copolymer having a hydrophobic group whose quaternization ratio is 40% by mole or more, and in which the ratio of the anion equivalent to the cation equivalent is 0.1 to 90%, and a calcium carbonate filler. The filler is one in which suitable water repellency is imparted to the filler. Hence, by adding this to pulp slurry, followed by a wet papermaking, the filler is efficiently adsorbed onto pulp fibers having anionic property, so that effective sizing performance can be imparted to the paper by using a smaller amount thereof than the internal sizing agent, while reducing the amounts of the internal sizing agent and the aluminum sulfate.Type: GrantFiled: January 16, 2008Date of Patent: January 8, 2013Assignees: Harima Chemicals, Inc., Nippon Paper Industries Co., Ltd.Inventors: Kazunari Sakai, Tomohiko Nakata, Yoshiharu Hashiguchi, Takashi Yamaguchi, Masaki Ito, Yasunobu Ooka
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Patent number: 8343311Abstract: A method for producing paper, cardboard or similar materials, comprising, separately or in a mixture, adding to a fibrous suspension: at least one main retention agent comprising a cationic (co)polymer, and at least one dual retention agent comprising a crosslinked cationic (co)polymer obtained in the form of a dispersion and placed in solution prior to its introduction into the fibrous suspension with gentle stirring. The crosslinked cationic (co)polymer having—a UL viscosity of between 1.3 and 2.7 cps, preferably between 1.5 and 2.4 cps, and—an apparent cationicity ratio of between 25 and 75%. Optionally, before or after the dual agent or the main retention agent are added, one or more tertiary retention agent(s) selected from the group comprising mineral particles and organic polymers carrying anionic charges, is added to the suspension.Type: GrantFiled: April 10, 2009Date of Patent: January 1, 2013Assignee: S.P.C.M. SAInventors: Rene Hund, Gatien Faucher
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Patent number: 8308902Abstract: A method of improving retention and drainage in a papermaking process is disclosed. The addition of an associative polymer, a poly(vinylamine) and optionally a siliceous material to the papermaking slurry to improve retention and drainage is disclosed. Additionally a method to improve retention and drainage comprising addition of an organic microparticle, a poly(vinylamine) and optionally a siliceous material to the papermaking slurry is disclosed. A composition comprising an associative polymer, and a poly(vinylamine) and optionally further comprising cellulose fiber is disclosed.Type: GrantFiled: May 8, 2009Date of Patent: November 13, 2012Assignee: Hercules IncorporatedInventors: Frank Sutman, John Harrington, Robert Gelman
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Patent number: 8308903Abstract: The present invention relates to a process for producing paper which comprises: (i) providing an aqueous suspension comprising cellulosic fibers, (ii) adding to the suspension after all points of high shear: a first polymer being a cationic polymer having a charge density above 2.5 meq/g; a second polymer; and a third polymer being an organic or inorganic anionic polymer; and (iii) dewatering the obtained suspension to form paper.Type: GrantFiled: May 3, 2011Date of Patent: November 13, 2012Assignee: Akzo Nobel N.V.Inventors: Fredrik Solhage, Joakim Carlén, Birgitta Johansson
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Patent number: 8273216Abstract: The present invention relates to a process for producing paper which comprises: providing an aqueous suspension comprising cellulosic fibers, adding to the suspension, after all points of high shear, a cationic polysaccharide; and a polymer P2 being an anionic polymer; and, dewatering the obtained suspension to form paper.Type: GrantFiled: December 20, 2006Date of Patent: September 25, 2012Assignee: Akzo Nobel N.V.Inventors: Fredrik Solhage, Joakim Carlén, Birgitta Johansson
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Patent number: 8241462Abstract: To provide a papermaking internal sizing agent capable of efficiently imparting sizing performance even in neutral papermaking which uses calcium carbonate as filler, and uses no aluminum sulfate or uses a small amount of aluminum sulfate, and also provide a paper or a paperboard obtained by using the papermaking internal sizing agent. The papermaking internal sizing agent comprises as an effective ingredient an amphoteric copolymer having hydrophobic groups and cationic groups, at least a part of the cationic groups being quaternized. Preferably, the amphoteric copolymer is obtained by polymerizing monomer ingredients that it essentially contain a hydrophobic monomer (A), a cationic monomer (B), and an anionic monomer (C) and that an anion equivalent of the monomer (C) is 0.1 to 90% of a cation equivalent of the monomer (B), in which a rate of quaternizing of the cationic groups is not less than 40% by mole. The paper or the paperboard contains the above papermaking internal sizing agent.Type: GrantFiled: March 6, 2008Date of Patent: August 14, 2012Assignees: Harima Chemicals, Inc., Nippon Paper Industries Co., Ltd.Inventors: Kazunari Sakai, Takahiro Fujiwara, Kazushige Inaoka, Takashi Yamaguchi, Masaki Ito, Yasunobu Ooka
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Patent number: 8216424Abstract: A paper product with absorbency and moisture strike through resistance is disclosed. More particularly, a multi-ply paper product with improved strike through resistance is disclosed, wherein at least one ply is a wetting resistant ply comprising at least one wetting resistant compound and at least one ply is an absorbent ply possessing greater absorbency than the wetting resistant ply. In addition, a two-ply paper napkin with improved moisture strike through resistance is disclosed, wherein the wetting resistant ply comprises alkyl ketene dimer and the two plies are separately microembossed, glue laminated together in a point to point configuration, and macroembossed with coin edging. Furthermore, a multi-ply paper product with improved strike through resistance is disclosed, wherein a first ply comprises at least one wetting resistant compound and a second ply possesses greater absorbency than the first ply.Type: GrantFiled: November 13, 2009Date of Patent: July 10, 2012Assignee: Georgia-Pacific Consumer Products LPInventors: Dinesh M. Bhat, Daniel W. Sumnicht
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Patent number: 8206553Abstract: A method of improving retention and drainage in a papermaking process is disclosed. The method provides for the addition of an associative polymer, prepared by an inverse emulsion polymerization process that utilizes multiple, discrete additions of initiator. Additionally, a process for preparation of an associative polymer, prepared by an inverse emulsion polymerization process that utilizes multiple discrete additions of initiator is disclosed.Type: GrantFiled: December 21, 2005Date of Patent: June 26, 2012Assignee: Hercules IncorporatedInventors: Robert A. Gelman, Erin A. S. Doherty
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Patent number: 8197640Abstract: The present invention relates to methods for manufacturing paper or paperboard with improved strength, the methods comprising the addition of the reaction product of a cationic polyacrylamide and an aqueous aldehyde generating compound or a glyoxal releasing compound, or glyoxal itself, prepared at the mill site at high concentrations, then diluted and added into a fiber furnish prior to forming or drying of the paper or paperboard sheet.Type: GrantFiled: July 20, 2007Date of Patent: June 12, 2012Assignee: Bercen, Inc.Inventor: Joseph Schaffer
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Patent number: 8172983Abstract: A method of preparing a stable dispersion of flocculated filler particles for use in papermaking processes comprises sequential addition of high and low molecular weight flocculating agents to an aqueous dispersion of filler particles followed by shearing of the resultant filler flocs to the desired particle size resulting in shear resistant filler flocs with a defined and controllable size distribution.Type: GrantFiled: September 12, 2007Date of Patent: May 8, 2012Assignee: Nalco CompanyInventors: Weiguo Cheng, Ross T. Gray
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Patent number: 8163134Abstract: Methods for making a heterogeneous polymer blend comprising one or more anionic polymers, one or more cationic polymers, and one or more non-ionic polymers, which method comprises (a) adding to a non-neutral solution a first amount of polymerization initiator and one or more anionic or cationic monomers, wherein each monomer has the same charge; (b) adding a second amount of the polymerization initiator and one or more non-ionic monomers; (c) adding a third amount of the polymerization initiator and one or more ionic monomers that are oppositely charged from the monomers of (a); adding stepwise, a fourth amount of the polymerization initiator to react any residual monomer, and (e) neutralizing the resulting polymer blend. Also claimed are heterogeneous polymer blends containing polymers formed from one or more anionic, cationic, and non-ionic monomers, either polymerized in situ or separately and then combined.Type: GrantFiled: September 18, 2009Date of Patent: April 24, 2012Assignees: Hercules Incorporated, Specialty Minerals (Michigan) Inc.Inventors: Frank J. Sutman, Joseph M. Mahoney, Robert Anthony Gill, Daniel Bruce Evans
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Patent number: 8152961Abstract: This invention relates to paper products and/or substrates suitable for being made and/or converted into wallboard tape; which also may be known as joint tape and/or drywall tape, having a pH of at least 7.0 and containing a plurality of cellulose fibers, a wet strength additive, an alkaline sizing agent, and an anionic promoter, as well as methods of making and using the same.Type: GrantFiled: August 19, 2010Date of Patent: April 10, 2012Assignee: International Paper CompanyInventors: Stephen A. Buzza, Dennis W. Anderson, Yufeng Xu, Bruce Richard McGaffin, Christopher Michael Wilson
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Patent number: RE44936Abstract: A composition for enhancing the dewatering of a paper sheet on a paper machine and a method for using the composition is disclosed. The composition comprising one or more aldehyde-functionalized polymers comprising amino or amido groups wherein at least about 15 mole percent of the amino or amido groups are functionalized by reacting with one or more aldehydes and wherein the aldehyde functionalized polymers have a molecular weight of at least about 100,000. The method comprising adding the composition to the paper machine at a dosage of about 0.05 lb/ton to about 15 lb/ton, based on dry fiber.Type: GrantFiled: July 31, 2012Date of Patent: June 10, 2014Assignee: Nalco CompanyInventors: Michael R. St. John, Angela P. Zagala