Pitch Control Patents (Class 162/DIG4)
  • Patent number: 6153049
    Abstract: Ethyleneamine compound(s), or mixtures thereof, are used in effective amounts to reduce or inhibit the deposition of white pitch on the paper making equipment during the processing to recycle coated paper.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: November 28, 2000
    Assignee: The Dow Chemical Company
    Inventor: Alan P. Croft
  • Patent number: 6143800
    Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking systems a composition comprising a dinonyl sulfosuccinate anionic surfactant which is used in systems containing multivalent cations, preferably calcium ions. The methods also utilize a blend of dioctyl sulfosuccinate and didecyl sulfosuccinate anionic surfactants.
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: November 7, 2000
    Assignee: Hercules Incorporated
    Inventors: Duy T. Nguyen, J. Barry Wright, Daniel Michalopoulos
  • Patent number: 6054054
    Abstract: The inventors have discovered a new method of treating paper machine white water aqueous systems and surfaces in the paper machine white water aqueous systems that prevents or inhibits the adhesion of bacterial cells to the surfaces and thereby controls the biological fouling of the surfaces. The process comprises adding to the aqueous system an adhesion-inhibiting amount of vinyl cationic polymer. This method effectively inhibits the adhesion of the bacterial cells to exposed surfaces without killing the fouling organisms and also without harming non-target organisms. In addition, the method of the present invention advantageously does not cause the formation of harmful substances in the effluent from the systems treated.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: April 25, 2000
    Assignee: Nalco Chemical Company
    Inventors: Linda R. Robertson, Michael R. St. John
  • Patent number: 6051108
    Abstract: A method is disclosed for removing and preventing the buildup of contaminants in papermaking wet press felts and on forming wires using a cleaning solution which contains at least one acidic cleaning compound and peracetic acid.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: April 18, 2000
    Assignee: Nalco Chemical Company
    Inventor: Ollie O'Neal, Jr.
  • Patent number: 6051160
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a derivatized cationic guar, and (2) styrene maleic anhydride copolymer. The invention also relates to a process for inhibiting pitch deposition in pulp and papermaking systems and on papermaking equipment.
    Type: Grant
    Filed: April 15, 1998
    Date of Patent: April 18, 2000
    Assignee: Ashland Inc.
    Inventors: Linda M. Hlivka, George K. Wai
  • Patent number: 5989392
    Abstract: A method is disclosed for controlling anionic trash and pitch deposition and treating coated broke which comprises the step of adding a polyammonium quaternary to a pulp and papermaking system. The polyammonium quaternary, which may be either branched or crosslinked, comprises at least one cationic monomer, preferably diallyldimethylammonium chloride, and at least one branching or crosslinking monomer, preferably N,N,N-triallylamine or N,N,N-triallylamine hydrochloride.
    Type: Grant
    Filed: September 10, 1997
    Date of Patent: November 23, 1999
    Assignee: Nalco Chemical Company
    Inventors: Jiansheng Tang, Jeffrey R. Cramm, Michael R. St. John, Laura M. Sherman
  • Patent number: 5961735
    Abstract: A method of treating a felt to remove contaminants therein comprises the steps of providing a felt used in transporting paper webs, preparing an enzyme solution comprising an enzyme selected from the group consisting of a cellulase, a hemicellulase, and mixtures thereof, applying the enzyme solution to the felt for a first predetermined period of time, rinsing the felt with water, applying a solution of sodium hydroxide to the felt to remove the enzyme solution, and rinsing the felt with water to remove the sodium hydroxide solution thereby removing the contaminants in the felt.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: October 5, 1999
    Assignee: North Carolina State University
    Inventors: John A. Heitmann, Jr., Thomas W. Joyce
  • Patent number: 5938970
    Abstract: Polynucleate metal hydroxide anionic compounds and method for their production. The compounds have the formula:M.sub.a N.sub.b (OH).sub.c X.sub.d Y.sub.e Z.sub.f.(H.sub.2 O).sub.gwhereinM is a tri- or more valent metal ion;N is a divalent metal ion that forms a soluble salt with anions X, Y or Z;OH represents the level of basicity;X is a monovalent anion;Y is a divalent anion;Z is a trivalent anion;a is 1;b is from 0.15 to 2.0;c is from 0.3 to 5;d is from 0 to 3;e is from 0.1 to 2.25;f is from 0 to 1; andg is greater than 4 where the compound is in the form of an aqueous solution, or from 0 to 20 where the compound is not in the form of an aqueous solution. The compounds are useful for water treatment for removal of suspended solids and for various applications in the paper industry.
    Type: Grant
    Filed: June 11, 1997
    Date of Patent: August 17, 1999
    Assignee: General Chemical Corporation
    Inventors: Phillip B. Reilly, Jr., P. Brennan Reilly, III
  • Patent number: 5914006
    Abstract: A process for controlling the deposition of stickies from paper stock suspensions during papermaking by adding to the paper stock suspensions from 0.001% to 5.0% by weight based on the weight of fibrous paper stock, of alkoxylation products obtained by reaction of alkylene oxides with C.sub.10-22 carboxylic acid derivatives or C.sub.10-22 carboxylic acids containing functional groups with at least one OH group in the 9, 10, 13 or 14 position.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: June 22, 1999
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Bernhard Nellessen, Rita Koester, Klaus Hornfeck, Berthold Schreck, Peter Daute
  • Patent number: 5885419
    Abstract: Methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. Albumins, globulins or blends thereof and spray-dried animal blood cells are added to the pulp or sprayed onto deposition prone surfaces of a papermaking system suffering from organic contaminants.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: March 23, 1999
    Assignee: BetzDearborn Inc.
    Inventors: Duy T. Nguyen, Tien-Feng Ling
  • Patent number: 5871614
    Abstract: An improved process for delignification of lignocellulosic raw material, such as wood chips, for the production of cellulose pulps for use in the manufacture of paper or paperboard and an improved pulping aid composition for use in said process are disclosed wherein the wood chips are treated in a closed reaction vessel with an alkaline pulping liquor with an amount of a cyclic keto compound, such as anthraquinone, included therein for achievement of a determined pulp yield, wherein the improvement comprises a reduction in the amount of anthraquinone required to achieve said yield by the addition to said alkaline pulping liquor, in addition to a reduced amount of the anthraquinone, a surfactant mixture comprising at least one alkyl alcohol alkoxylate and at least one polyoxyalkylene glycol ether of an ester of an acid selected from the group consisting of ricinoleic acid and 12-hydroxystearic acid.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: February 16, 1999
    Assignee: Westvaco Corporation
    Inventor: William T. Turner
  • Patent number: 5863385
    Abstract: The present invention relates to the use of oil-in-water emulsions to clean machines and parts of plants in the production of pulp, paper, paper board, and cardboard and to prevent impurities of adhesives and adherent resins to those units.The emulsion comprises as component of the oil phase at least one of the following substances:1. a saturated or unsaturated, open-chain or cyclic, normal or isomeric hydrocarbon with 8-30 carbon atoms2. a saturated or unsaturated fatty alcohol, a saturated or unsaturated fatty acid, a fatty acid monoalkylester, a fatty acid amide or a fatty acid monoalkylamide of a saturated or unsaturated fatty acid, all of the compounds mentioned under 2. having 8 to 30 carbon atoms3. a mono- or polyester of a saturated or unsaturated, mono- or multivalent carboxylic acid with 2 to 30 carbon atoms and polyols, with the exception of polyethylene glycols4. a polyamide of saturated or unsaturated fatty acids with 8 to 30 carbon atoms and aliphatic polyamides with two to six nitrogen atoms5.
    Type: Grant
    Filed: May 15, 1996
    Date of Patent: January 26, 1999
    Assignee: Stockhausen GmbH & Co. KG
    Inventors: Frank Siebott, Joachim Werres
  • Patent number: 5830315
    Abstract: There is provided a composition comprising tannin containing hydroxyl groups which has been (a) chemically modified by reaction of at least one of said hydroxyl groups with at least one member selected from the group consisting of an esterification agent (e.g. acetic anhydride), etherification agent (e.g. dichloromethane or quaternary organic amine such as N-(3-chloro-2-hydroxypropyl) trimethyl ammonium chloride) to form the corresponding ester, or ether, through said hydroxyl group, and (b) derivatized. The chemically modified tannin is derivatized by reaction with aldehyhde (e.g. formaldehyde), or aldehyde and at least one member selected from the group consisting of ammonia and organic amine containing at least one primary or secondary nitrogen (e.g. cyclohexyl amine); said derivatized tannin being water soluble or dispersable at a pH below 7 and water insoluble at a pH above 7.
    Type: Grant
    Filed: July 6, 1995
    Date of Patent: November 3, 1998
    Assignee: BetzDearborn Inc.
    Inventors: David Brian Mitchell, Ralph Lemmel Minnis, Thomas Peter Curran, Steven M. Deboo, John Arthur Kelly, Rashmi Patwardhan, Wun Ten Tai
  • Patent number: 5800677
    Abstract: The invention provides a method for preventing pitch trouble which comprises adding to a pulp slurry a pitch-controlling agent comprising 100 parts by weight of a zinc salt of a higher fatty acid and from 1 to 20 parts by weight of a cationic surfactant.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: September 1, 1998
    Assignee: Nissin Kagaku Kenkyusho Co., Ltd.
    Inventor: Yasuo Kato
  • Patent number: 5798023
    Abstract: A method for minimizing pitch, ink, and stickies particle deposits in the paper making process by causing the retention of such particles onto fiber, comprising the steps of adding an effective pitch, ink, and stickies controlling amount of talc to a suspension of fiber in contact with the paper machine and associated parts and adding an effective pitch, ink, and stickies controlling amount of bentonite to the suspension, thereby increasing retention of pitch, ink, and stickies onto the fiber and minimizing the deposition of pitch, ink, and stickies particles on the paper machine and associated parts.
    Type: Grant
    Filed: May 14, 1996
    Date of Patent: August 25, 1998
    Assignee: Nalco Chemical Company
    Inventors: Przemyslaw Pruszynski, John R. Armstrong
  • Patent number: 5779858
    Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking system a composition comprising a polyvinyl alcohol having 50 to 100% hydrolysis and a high molecular weight gelatin having a molecular weight of about 100,000 or higher.
    Type: Grant
    Filed: May 22, 1996
    Date of Patent: July 14, 1998
    Assignee: BetzDearborn Inc.
    Inventor: Duy T. Nguyen
  • Patent number: 5776310
    Abstract: This invention relates to the treatment of press section felts. The treatment comprises applying to the felts an effective amount of a felt cleaning agent comprising one or more anionic polymers, selected from the group of polycarboxylic acids and derivatives thereof having an average molecular weight of 500 to less than 5000, 2-phosphino-1,2,4-tricarboxybutane, and an amphoteric surfactant selected from the group consisting of alkyl-N-(3 aminopropyl)-glycines and alkyl-di(aminoethyl)-glycines. The cleaning agent inhibits the blinding of paper machine press section felts and provides improved felt conditioning at much lower concentration levels than known commercial products.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: July 7, 1998
    Assignee: BetzDearborn Inc.
    Inventors: Michael Anthony McDermott, Jurgen Friedrich Schuetz
  • Patent number: 5762757
    Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking systems a composition comprising a dinonyl sulfosuccinate anionic surfactant which is used in systems containing multivalent cations, preferably calcium ions. The methods also utilize a blend of dioctyl sulfosuccinate and didecyl sulfosuccinate anionic surfactants.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: June 9, 1998
    Assignee: BetzDearborn Inc.
    Inventors: Duy T. Nguyen, J. Barry Wright, Daniel Michalopoulos
  • Patent number: 5744043
    Abstract: Stickies derived from pulping or deinking of cellulosic material are controlled by adding to the cellulosic liquor containing the stickies an emulsion in water of cross-linked, insoluble, ionisable and swellable polymer particles.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: April 28, 1998
    Assignee: Allied Colloids Limited
    Inventors: Paul Kenneth Cutts, Anthony John Burke
  • Patent number: 5744003
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a derivatized cationic guar, and (2) styrene maleic anhydride copolymer.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: April 28, 1998
    Assignee: Ashland Inc.
    Inventors: Linda M. Hlivka, George K. Wai
  • Patent number: 5723021
    Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking system a composition comprising a polyvinyl alcohol having 50 to 100% hydrolysis, a high molecular weight gelatin having a molecular weight of about 100,000 or higher, and a cationic polymer.
    Type: Grant
    Filed: August 21, 1996
    Date of Patent: March 3, 1998
    Assignee: BetzDearborn Inc.
    Inventor: Duy T. Nguyen
  • Patent number: 5705383
    Abstract: The present invention relates to the use of certain fungi in the reduction of the pitch and/or lignin content of cellulosic materials. In particular, the white rot fungi Schizophyllum commune, Trichaptum biforme and Phanerochaete gigantea are useful in reducing pitch and/or lignin, or both, which saves electrical energy during the mechanical refining of pulps and pulpwoods used in making cellulosic products.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: January 6, 1998
    Assignee: Clariant Finance (BVI) Limited
    Inventors: Robert A. Blanchette, Sara Iverson, Chad J. Behrendt
  • Patent number: 5702644
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in acid pulp and paper making operations comprising a derivatized cationic guar and an alkali metal polyacrylate dispersant. The invention also relates to a process for inhibiting pitch deposition on paper making equipment.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: December 30, 1997
    Assignee: Ashland Inc.
    Inventors: Linda M. Hlivka, George K. Wai
  • Patent number: 5688371
    Abstract: Process for fixing anionic interfering substances in papermaking process by the addition of cationic polycondensation products obtained by reactinga) a monofunctional or polyfunctional amine having one or more primary and/or secondary and/or tertiary amino groups withb) cyanamide, dicyandiamide, guanidine or biguanidine, wherein up to 50 mol. % of cyanamide, dicyandiamide or biguanidine may be replaced with a dicarboxylic acid or a mono- or diester thereof, with elimination of ammonia, optionally in the presence of a catalyst,optionally together with other auxiliaries.
    Type: Grant
    Filed: June 18, 1996
    Date of Patent: November 18, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Joachim Konig, Jurgen Kopp, Udo-Winfried Hendricks, Jurgen Reiners, Peter Nowak
  • Patent number: 5667634
    Abstract: Addition of a water-soluble polyelectrolyte (i.e. an anionic or cationic polymer) significantly increases the hydrolysis rate of esters in the presence of lipases. The invention provides a process for hydrolysis of water-insoluble ester in the presence of a lipase characterized by the presence of a water-soluble polyelectrolyte. The invention also provides a method of increasing the rate of hydrolysis of water-insoluble ester in the presence of a lipase by incorporation of a water-soluble polyelectrolyte.
    Type: Grant
    Filed: July 6, 1994
    Date of Patent: September 16, 1997
    Assignee: Novo Nordisk A/S
    Inventors: Yuko Fujita, Haruo Awaji, Hidesato Shimoto, Masaki Sharyou
  • Patent number: 5643413
    Abstract: A method of producing a multi-ply paperboard product. A single aqueous recycled pulp stock which contains both heavy contaminants and lightweight contaminants is separated into three fractions, including a first fraction which contains the heavy contaminants, a second middle density fraction that contains the most desirable fibers, and a third low density fraction that contains the lightweight contaminants. The three fractions are discharged from a multi-channel head box onto a forming fabric, with the middle density fraction constituting the base ply in contact with the forming fabric, the low density fraction being the central ply and the high density fraction being the outer ply, thus forming a multiple-ply paperboard product.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: July 1, 1997
    Assignee: Hoffman Environmental Systems, Inc.
    Inventor: Roger P. Hoffman
  • Patent number: 5626720
    Abstract: A method for the control of pitch in an aqueous system used in pulp or paper making is disclosed which comprises adding to the system, or to the pulp making or paper making machinery, a water soluble polymer derived from (a) an epihalohydrin, a diepoxide or a precursor of an epihalohydrin or diepoxide, (b) an alkyl amine having a functionality with respect to an epihalohydrin of 2 and (c) an amine which has a functionality with respect to an epihalohydrin greater than 2 and which does not possess any carbonyl groups.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: May 6, 1997
    Assignee: W.R. Grace & Co.-Conn.
    Inventor: Thord Gustav G. Hassler
  • Patent number: 5616215
    Abstract: A process for hydrolysis of water-insoluble esters in the presence of a lipase, at a pH in the range of 3-7 particularly to such a process for hydrolysis of resin in pulp.
    Type: Grant
    Filed: November 10, 1994
    Date of Patent: April 1, 1997
    Assignee: Novo Nordisk A/S
    Inventors: Hans P. Heldt-Hansen, Yuko Fujita, Haruo Awaji, Hidesato Shimoto, Masaki Sharyou
  • Patent number: 5614062
    Abstract: A process for controlling the deposition of stickies from paper stock suspensions in papermaking involving the steps of: (a) providing a paper stock suspension containing stickies; and (b) contacting the stickies in the paper stock suspension with a native starch.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: March 25, 1997
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Heinz-Guenther Schulte, Klaus Hornfeck, Dieter Kaps
  • Patent number: 5609724
    Abstract: Ascospores of wood-penetrating, pitch-grading fungi of the class of Ascomycotina and Deuteromycotina, eg. Ophiostromas, may be screened to provide fungi combining the properties of good growth on non-sterile wood substrates and minimized or even enhanced brightness effects for use in pitch reduction of wood substrates, eg. logs and wood chips. A new and improved method of isolating such ascospores involving effective suspension in an oil consumable by the fungus, eg. a vegetable oil, and then treatment of the oil with a dispersing agent is also disclosed.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: March 11, 1997
    Assignee: Sandoz Ltd
    Inventors: Roberta L. Farrell, Yitzhak Hadar, Philip A. Wendler, Wendy Zimmerman
  • Patent number: 5607855
    Abstract: This invention relates to fungi having particularly desirable overall properties for reducing the pitch content of pulpwoods and pulps, and to the preparation and use of such fungi. In particular, the present invention provides a biologically pure cultures of the fungus Ophiostoma piliferum which are characterized by not only growing white or colorless and by having good growth virulence, but which also exhibit exceptional pitch degradation properties.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: March 4, 1997
    Assignee: Sandoz Ltd.
    Inventors: Wendy C. Zimmerman, Roberta L. Farrell
  • Patent number: 5597448
    Abstract: Pitch in paper mills is controlled by treating paper mill systems with a water soluble polymer which contains a lower alkyl N-vinyl amide or a hydrolyzed lower alkyl N-vinyl amide.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: January 28, 1997
    Assignee: Nalco Chemical Company
    Inventors: Peter E. Reed, Carol S. Greer
  • Patent number: 5575893
    Abstract: A method for conditioning the felts in a papermaking process utilizing deinked secondary fiber in the furnish by adding a felt conditioner consisting of from 5-33% of a nonionic surfactant, from 5-33% of a dispersant, or blends thereof, with the remainder water; wherein the nonionic surfactant is selected from the group consisting of ethoxylated nonylphenols having moles of ethoxylation of from 7.5 to 30 and an HLB of about 12 to 17.2 and di-alkyl phenol ethoxylates having moles of ethoxylation of from 15 to 24 and an HLB of about 13 to 15.1; and wherein the dispersant is selected from the group consisting of the sodium salt of naphthalene sulfonate formaldehyde-condensate having an average molecular weight of from about 700 to 3500, the potassium salt of polymerized alkyl naphthalene sulfonic acid having an average molecular weight of approximately 1000, or the sodium or ammonium salt of lignosulfonate. Additionally, from 1 to 5% of an alkylether hydroxypropyl sultaine enhances performance.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: November 19, 1996
    Assignee: BetzDearborn Inc.
    Inventors: Abdul Q. Khan, Kevin D. Curham, Jeffrey R. Cowart
  • Patent number: 5573641
    Abstract: A method of removing and preventing the build-up deposit-forming microorganisms in a papermachine fluid, the method comprising the step of treating the fluid with an aqueous, the aqueous solution including from about 0.1 to about 35 parts per million of an ethylene oxide/propylene oxide copolymer having a molecular weight of from about 2500 to about 3550 daltons.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: November 12, 1996
    Assignee: Nalco Chemical Company
    Inventors: Robert J. Meade, Linda R. Robertson, Nicole R. Taylor
  • Patent number: 5556510
    Abstract: A method of inhibiting the deposition of organic contaminants in a pulp and papermaking system comprising adding to the system an effective amount of a detackifying composition comprising a charged polymer and an oppositely charged surfactant, with the proviso that at least the polymer or the surfactant be surface active.
    Type: Grant
    Filed: April 25, 1995
    Date of Patent: September 17, 1996
    Assignee: Betz Laboratories, Inc.
    Inventors: David D. Dreisbach, Mark E. Laurint, Tien-Feng Ling
  • Patent number: 5540814
    Abstract: Methods for reducing stickies and removing ink from wastepaper fiber wherein a cationic kaolin is added to a wastepaper fiber furnish under conditions such that the kaolin attaches to the stickies or the ink and the stickies or ink are removed from the furnish using a centrifugal cleaner.
    Type: Grant
    Filed: January 24, 1995
    Date of Patent: July 30, 1996
    Assignees: Nord Kaolin Company, Cascades, Inc.
    Inventors: Jerry Curtis, Henry Agbaje, Janet Woodward, Andres Vaska, Roger Gaudreault
  • Patent number: 5536363
    Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking system a composition comprising a polyvinyl alcohol having 50 to 100% hydrolysis and a high molecular weight gelatin having a molecular weight of about 100,000 or higher.
    Type: Grant
    Filed: April 12, 1995
    Date of Patent: July 16, 1996
    Assignee: Betz PaperChem, Inc.
    Inventor: Duy T. Nguyen
  • Patent number: 5534057
    Abstract: A process for beneficiating crude kaolin clay under defined conditions with a sufficient amount and concentration of aluminum chlorhydrate (0.5 to about 5.0 active wt. %) to improve the clay's ability to adsorb pitch during the process of making paper. The invention also relates to the treated clay and to the use of the clay in a papermaking process to absorb pitch and/or anionic trash.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: July 9, 1996
    Assignee: J. M. Huber Corporation
    Inventors: John M. M. Harrison, Gary M. Freeman, Carl J. Marshall, Jr., James C. Marvin, Albert F. Lareau
  • Patent number: 5527431
    Abstract: A method for controlling pitch in papermaking systems which comprises the step of adding a water-soluble, silicon-containing polyelectrolyte copolymer coagulant to pulp and paper process water. The water-soluble, silicon-containing polyelectrolyte copolymer coagulant preferably comprises diallyldimethyl ammonium chloride and a vinyl alkoxysilane.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 18, 1996
    Assignee: Nalco Chemical Company
    Inventors: Chandrashekar S. Shetty, Manian Ramesh
  • Patent number: 5520781
    Abstract: This invention relates to an improved press felt conditioning treatment which controls the deposition of poly(aminoamide)--epichlorohydrin type resins in a press felt. The treatment comprises applying to the felt an effective inhibiting amount of a conditioner comprising: an ethoxylated nonylphenol having greater than about 30 moles of ethoxylation; sodium n-hexadecyl diphenyloxide disulfonate; a fatty acid imidazoline or an alkylamidopropyldimethylamine which include an alkyl hydrophobe substituent having a carbon chain length of about 18.
    Type: Grant
    Filed: February 22, 1995
    Date of Patent: May 28, 1996
    Assignee: Betz PaperChem, Inc.
    Inventors: Kevin D. Curham, Abdul Q. Khan
  • Patent number: 5501769
    Abstract: A process for cooking wood to pulp by contacting the wood with a deresinating agent containing fatty acid esters of polyoxyalkene glycols priors to cooking the wood with an alkaline liquor to simultaneously reduce pulp rejects and increase pulp yield.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: March 26, 1996
    Assignee: Chemstone, Inc.
    Inventors: Michael M. Blackstone, Hugh E. Nuckolls
  • Patent number: 5441602
    Abstract: Hydrolyzed copolymers of (A) maleic anhydride with (B) at least one mono-ethylenically unsaturated monomer other than acrylic acid or methacrylic acid or with a mixture of (B) and (C) acrylic acid or methacrylic acid are effective for inhibiting the formation of calcium carbonate scale in wood pulp production.
    Type: Grant
    Filed: August 18, 1993
    Date of Patent: August 15, 1995
    Assignee: FMC Corporation
    Inventors: Arthur Harris, John Burrows, David Wilson
  • Patent number: 5433824
    Abstract: A method for controlling, inhibiting the deposition of and/or for removing stickies from the surfaces of pulping and papermaking machinery in secondary fiber operations by adding an effective amount of a melamine formaldehyde-type polymer to a pulp slurry or furnish containing secondary fiber that is in contact with said machinery. Improved paper end products resulting from this method are also disclosed.
    Type: Grant
    Filed: February 26, 1993
    Date of Patent: July 18, 1995
    Assignee: Calgon Corporation
    Inventor: Paul F. Richardson
  • Patent number: 5415739
    Abstract: Adhesive contaminants in secondary fiber paper pulps are detackified by the use of a water soluble terphthalate glycol terpolymer.
    Type: Grant
    Filed: November 18, 1993
    Date of Patent: May 16, 1995
    Assignee: Nalco Chemical Company
    Inventors: Gary S. Furman, Jr., James H. Smith, Jr.
  • Patent number: 5393380
    Abstract: Diallyl dimethyl ammonium chloride/3-acrylamido-3-methyl-butanoic acid copolymers were prepared and found to be effective pitch control agents in papermaking systems.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: February 28, 1995
    Assignee: Nalco Chemical Company
    Inventors: Peter E. Reed, Carol S. Greer
  • Patent number: 5368694
    Abstract: A method for controlling or inhibiting the deposition of pitch derived from aqueous pulp suspensions having a neutral or cationic soluble charge onto paper machine equipment surfaces which contact the pulp, comprising a) contacting the pulp with an anionic polymer in an amount sufficient to maintain an anionic charge in the pulp and b) contacting the paper machine equipment surfaces with a cationic polymer in an amount sufficient to inhibit the deposition of pitch deposits thereon.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: November 29, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Evan V. Rohlf, Fletcher Walley, Richard J. Wagner
  • Patent number: 5368692
    Abstract: A method for the control of pitch in a pulp is characterized in that the method comprises sequentially adding to and mixing with the pulp (1) 1-10 Kg/tonne of pulp of a low molecular weight, high cationic charge, polymeric, water-soluble species, such as those derived from inorganic aluminium salts or quaternary polyamines, and (2) 0.5 to less than 10 Kg/tonne of pulp of montmorillonite clay particles, such as bentonite, which clay particles may be chemically modified to improve adsorption capacity or otherwise treated to increase the anionic charge density of the dispersion but which do not have a water-soluble cationic polymer associated therewith.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: November 29, 1994
    Assignee: Vinings Industries Inc.
    Inventor: Arthur P. Derrick
  • Patent number: 5300194
    Abstract: Accumulation of pitch or stickies in pulp or paper making is controlled by applying to the pulp or paper making equipment which is not in continuous contact with water separately a water soluble cationic polymer and a water soluble anionic polymer.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: April 5, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Ulrich Welkener, Thord Hassler
  • Patent number: 5292404
    Abstract: The present invention relates to a process for trash removal or pitch control in the paper manufacture, in which process as agent for the trash removal or pitch control cationic groups containing polymers of 50 to 100%-wt. quaternized dimethylaminopropylmethacrylamide or dimethylaminopropylmethacrylamide and 0 to 50%-wt acrylamide, acrylic acid, methacrylic acid, acrylamidomethylpropanesulfonic acid, are used, which polymers have an intrinsic viscosity of smaller than 150 ml/g. The trash removal or pitch control agent is added to the pulp flow and/or the circuit water in amounts of up to 1%-wt., relative to the dry weight of the paper manufactured.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: March 8, 1994
    Assignee: Chemische Fabrik Stockhausen GmbH
    Inventors: Hans-Georg Hartan, Alfons Landscheidt
  • Patent number: 5292403
    Abstract: A method of inhibiting the deposition of organic contaminants in a pulp and papermaking system comprising adding to the system an effective amount of a detackifying composition comprising a charged polymer and an oppositely charged surfactant, with the proviso that at least the polymer or the surfactant be surface active.
    Type: Grant
    Filed: March 10, 1993
    Date of Patent: March 8, 1994
    Assignee: Betz PaperChem, Inc.
    Inventors: David D. Dreisbach, Mark E. Laurint