Filtration Patents (Class 528/502A)
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Patent number: 6156829Abstract: This invention relates to stable, quaternized vinylpyridine carboxylate co-polymers, useful as dye transfer inhibitors and polymers complexable with active agrochemicals or pharmaceuticals for controlled release thereof, and to a commercial process for the synthesis thereof in high yield and purity.Type: GrantFiled: December 15, 1998Date of Patent: December 5, 2000Assignee: ISP Investments Inc.Inventors: Jenn S. Shih, Eduardo T. Yap, John C. Hornby, Bala Srinivas
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Patent number: 6136951Abstract: A method for evaluating the polymer growth inhibition ability of a compound or compounds is disclosed wherein the method comprises:A) weighing a dry seed of insoluble polymer capable of growing via a living polymerization mechanism;B) subjecting the seed of insoluble polymer to conditions capable of causing a living polymer to grow via a living polymerization mechanism;C) drying the seed; andD) weighing the seed a second time to determine any increase in weight;wherein the polymer growth inhibition ability of the compound or compounds is inversely proportional to any increase found in weight of the seed.Type: GrantFiled: August 16, 1999Date of Patent: October 24, 2000Assignee: Uniroyal Chemical Company, Inc.Inventors: Brigitte Benage, Brendan J. Geelan, Gerald J. Abruscato
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Patent number: 6121411Abstract: The invention relates to processes for treating acidic crudes or fractions thereof to reduce or eliminate their acidity by addition of effective amounts of crosslinked polymeric amines. The process has utility for crude processing.Type: GrantFiled: August 6, 1999Date of Patent: September 19, 2000Assignee: Exxon Research and Engineering CompanyInventors: Guido Sartori, David William Savage, Bruce Henry Ballinger, David Craig Dalrymple
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Patent number: 6075073Abstract: Rubbery polymers in hydrocarbon solutions are emulsified in aqueous liquids and converted to latices by partitioning the emulsion through a membrane of selective permeability to the hydrocarbon solvent relative to both water and the polymer, thereby removing the hydrocarbon solvent from the emulsion. The foaming that is often associated with removing hydrocarbon solvent from aqueous emulsions by conventional means is thus avoided. Membrane partitioning mechanisms that are useful for this application include those involving both nonporous and microporous membranes, those passing the solvent both as a liquid and as a gas, those drawing off the permeate as both a liquid and a gas, and various combinations of these methods.Type: GrantFiled: August 20, 1998Date of Patent: June 13, 2000Assignee: Apex Medical Technologies, Inc.Inventors: Mark W. McGlothlin, Eric V. Schmid
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Patent number: 6056901Abstract: A method which is capable of manufacturing regenerated synthetic resin products, particularly slide fastener parts of regenerated synthetic resin, with good quality by using as a raw material such waste synthetic resin materials as emanate from the production line of slide fasteners of synthetic resin or arise from waste plastic products.Type: GrantFiled: August 28, 1998Date of Patent: May 2, 2000Assignee: YKK CorporationInventors: Tsutomu Hamatani, Kenshi Hamamori
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Patent number: 6056967Abstract: A process for the preparation of water-soluble, amino-containing condensates and adducts having a greater drainage and retention effect in papermaking, in which from 5 to 95% by weight of the condensates or adducts are separated off as permeate from solutions of water-soluble, amino-containing condensates or adducts by ultrafiltration through membranes and the amino-containing condensates or adducts having improved efficiency are, if required, isolated from the retentate, and the high molecular weight polymer fractions contained in the retentate are used as retention aids, drainage aids and fixing compositions in papermaking, as promoters in the sizing of paper with alkyldiketenes, as flocculants for sewage sludges, as adhesion promoters in the production of laminated films, as additives for hair and skincare compositions and as compositions for immobilizing anionic active ingredients.Type: GrantFiled: July 6, 1998Date of Patent: May 2, 2000Assignee: BASF AktiengesellschaftInventors: Ulrich Steuerle, Hubert Meixner, Rainer Dyllick-Brenzinger, Wolfgang Reuther, Hartmut Kanter, Albert Hettche, Jurgen Weiser, Gunter Scherr
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Patent number: 6011096Abstract: This invention relates to an improved free radical polymerization process for directly producing stable vinylpyridine polymer particles in an aqueous suspension and in a high state of polymer purity by effecting the polymerization in the presence of a water soluble suspension agent selected from the group of polyvinyl lactam, a hydroxy-containing polymer, a polyvinyl alcohol and a mixture thereof.Type: GrantFiled: December 15, 1998Date of Patent: January 4, 2000Assignee: ISP Investments Inc.Inventors: Jenn S. Shih, Eduardo T. Yap, John C. Hornby, Bala Srinivas
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Patent number: 5977294Abstract: A process for polymer deformulation by solvent solution filtration begins by including formulated polymers and/or polymer products in a recycle stream. The formulated polymer products include a quantity of soluble polymers and/or insoluble polymers, soluble and/or insoluble colorants, formulations and additives. The recycle stream is placed in a solvent, taking the polymer and formulations into a solvent/polymer solution. Next, the solution is processed through a filtration stage. A quantity of mineral filter aid particles are then added to the solution to adsorb formulations contained in the solution. One of the mineral filter aids must be some form of carbon, preferably activated carbon. Other mineral filter aids may include diatomaceous earth. The solvent/polymer solution is then subjected to an additional polish filtration stage to remove substantially all of the mineral filter agents and associated formulations.Type: GrantFiled: May 13, 1997Date of Patent: November 2, 1999Assignee: PRS, LLCInventor: Andrew F. Hoehn
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Patent number: 5945490Abstract: Polyarylene sulfide (PAS) is disclosed, of which extract with methylene chloride is in an amount of not more than 0.7% by weight, a melt viscosity V.sub.6 is 20 to 15,000 poises and a content of --SX groups is at least 15 micro moles/g, wherein X represents an alkali metal or a hydrogen atom. The PAS is prepared as follows: an alkali metal sulfide is reacted with a dihaloaromatic compound in an organic amide solvent, while a part of a gaseous phase in a reactor is condensed by cooling a gaseous phase part of the reactor to return the condensed liquid to a liquid phase; and the polyarylene sulfide thus prepared is washed with an organic solvent and then with water. The present invention also provides a composition comprising 100 parts by weight of (A) the aforesaid PAS and 0.01 to 5.0 parts by weight of (B) at least a silane compound selected from the group consisting of methacryloxysilane compounds, ureidosilane compounds and epoxy silane compounds.Type: GrantFiled: November 10, 1997Date of Patent: August 31, 1999Assignee: Tonen Chemical CorporationInventors: Takashi Tsuda, Osamu Komiyama
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Patent number: 5929204Abstract: Vinylphenol-type polymers are useful materials and are used in many fields such as photoresist, packaging material for IC, printed circuit board, lense, etc. When the polymers are used in an electronic field such as photoresist and packaging material for IC, it is desired to reduce metal concentration in the polymer in the order of ppb units. A simple and effective process for removing metals from vinylphenol-type polymers is disclosed. The process comprises passing an organic solvent solution of a vinylphenol-type polymer either through (a) a filter containing an ion exchange material and/or a chelate-forming material and generating a zeta (.zeta.) potential by a cationic charge modifying agent or through (b) (i) a filter containing an ion exchange material and/or a chelate-forming material and (ii) a filter generating a zeta (.zeta.) potential by a cationic charge modifying agent.Type: GrantFiled: January 30, 1998Date of Patent: July 27, 1999Assignee: Maruzen Petrochemical Co., Ltd.Inventors: Takeshi Noguchi, Tadashi Matsumoto
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Patent number: 5916999Abstract: A process for producing continuous filament fibers from a hydroxy- or amino-alkyl-melamine modified melamine-formaldehyde condensation product comprises filtering the highly concentrated aqueous solution of the melamine-formaldehyde condensation product, forcing the filtrate through a spinneret, drying the extruded filaments in a drying shaft by means of hot air, and treating the dried filaments in a tempering oven at temperatures which rise gradually to a maximum temperature of from 160 to 250.degree. C. to cure the precondensate.Type: GrantFiled: October 9, 1997Date of Patent: June 29, 1999Assignee: BASF AktiengesellschaftInventors: Heinz Berbner, Hartmut Gihr, Uwe Rachwalsky, Hans Dieter Zettler
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Patent number: 5856381Abstract: A process for compounding polymer dispersions, which comprises circulating the polymer dispersion from a vessel (7) having a stirring device (6) through a line (3) having a mixing device (2) by means of a pump (4) which is located in the line (3), and, before the entry of the circulated polymer dispersion into the mixing device (2), metering at least one solution or dispersion of at least one compounding material from at least one stock container (5) via a supply line (9) into the circulated polymer dispersion.Type: GrantFiled: April 25, 1997Date of Patent: January 5, 1999Assignee: BASF AktiengesellschaftInventors: Gerd Rehmer, Walter Holtrup, Karlheinz Schwarz
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Patent number: 5767207Abstract: A process for preparing a polymer cement which is relatively free of alkali metal salt by preparing the polymer cement with a polymerization terminating agent which is a diketone which leaves alkali metal salt in the cement which is readily removable by centrifugation.Type: GrantFiled: May 23, 1996Date of Patent: June 16, 1998Assignee: Shell Oil CompanyInventors: John David Wilkey, Zaida Diaz
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Patent number: 5668186Abstract: The invention relates to a novel process for depolymerizing polyesters by subjecting the polyesters to catalysts and organic solvents which are substantially free of oxygen and water in order to produce macrocyclic polyester oligomers substantially free of hydroxybutyl terminated linear impurities.Type: GrantFiled: March 20, 1996Date of Patent: September 16, 1997Assignee: General Electric CompanyInventors: Daniel Joseph Brunelle, Ganesh Kailasam, Judith Ann Serth-Guzzo, Paul Russell Wilson
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Patent number: 5554657Abstract: The invention described herein provides a process for recycling a mixed polymer recycle stream containing polyester polymers, particularly polyethylene terephthalate (PET) typically in the form of carbonated soft drink or other containers. This novel process includes the steps of: (1) contacting the mixed polymer recycle stream with a solvent which selectively dissolves the PET. (2) separating the selective solvent containing PET from the residual mixed polymer, (3) cooling the selective solvent to precipitate the PET, and (4) removing the selective solvent from the precipitated PET. It is preferable that the mixed polymer recycle stream be prepared for recycling by conventional steps, such as water washing. In a preferred embodiment, the mixed polymer recycle stream is chemically washed subsequent to water washing and prior to contact with the selective solvent. The PET recovered is preferably combined with "virgin" PET and further processed to increase its molecular weight.Type: GrantFiled: May 8, 1995Date of Patent: September 10, 1996Assignee: Shell Oil CompanyInventors: Thomas F. Brownscombe, Howard L. Fong, Zaida Diaz, Hoe H. Chuah, Raymond L. June, Kevin L. Rollick, Thomas C. Semple, Mark R. Tompkin