Organic Sulfur Compound Contains -s-s- Or -o-o-group Patents (Class 526/223)
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Patent number: 10566480Abstract: Disclosed are a sealing material for solar cell modules and a manufacturing method thereof capable of endowing good transparency and heat resistance to the sealing material for solar cell modules while using a polyethylene-based resin. The disclosed sealing material for solar cell modules uses a polyethylene-based resin with a density of 0.900 g/cm3 or less, and an MFR between 0.1 g/10 min and 1.0 g/10 min. The sealing material is obtained by melt molding a resin composition containing a polyethylene-based resin with density 0.890 g/cm3 or less, and a polymerization initiator contained at 0.02 mass % or more but less than 0.5 mass % of the composition, wherein the density difference of the resin composition before and after the melt molding is within 0.05 g/cm3, and the MFR difference of the resin composition before and after the melt molding is 1.0 g/10 min or greater.Type: GrantFiled: June 28, 2017Date of Patent: February 18, 2020Assignee: Dai Nippon Printing Co., Ltd.Inventors: Ken Murasawa, Satoshi Osone
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Patent number: 10025181Abstract: A polymer comprises the polymerized product of monomers comprising an acid-deprotectable monomer, a base-soluble monomer, a lactone-containing monomer, and a photoacid-generating monomer; a chain transfer agent of the formula; wherein Z is a y valent C1-20 organic group, x is 0 or 1, Rd is a substituted or unsubstituted C1-20 alkyl, C3-20 cycloalkyl, C6-20 aryl, or C7-20 aralkyl; and optionally, an initiator.Type: GrantFiled: June 21, 2012Date of Patent: July 17, 2018Assignee: DOW GLOBAL TECHNOLOGIES LLCInventor: John W. Kramer
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Patent number: 8987396Abstract: Polymer polyols having a solids content of greater than 40 wt. %, a total ethylene oxide content of up to 25 wt. %, and a viscosity at 25° C. of less than 15,000 centistokes are produced by reacting (1) a base polyol having active hydrogen atoms with an ethylene oxide content of from 15 to 40 wt. % that has been formed in the presence of a double metal cyanide (DMC) catalyst, (2) one or more unsaturated monomers, (3) at least one radical initiator, optionally (4) a preformed stabilizer and optionally (5) a chain transfer agent. These polymer polyols (PMPOs) are useful in the preparation of polyurethane foams and elastomers.Type: GrantFiled: March 15, 2013Date of Patent: March 24, 2015Assignee: Bayer MaterialScience LLCInventors: Rick L. Adkins, Jose F. Pazos, Stanley L. Hager
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Patent number: 8895672Abstract: Provided herein are methods for preparing vinylidene-terminated polyolefins. Further provided herein are sulfide-terminated polyolefins.Type: GrantFiled: August 9, 2013Date of Patent: November 25, 2014Assignee: Chevron Oronite Company LLCInventor: Casey D. Stokes
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Patent number: 8835565Abstract: Preformed stabilizers useful for the production of low viscosity, high solids polymer polyols are produced by free-radical polymerization of: (a) at least one ethylenically unsaturated macromolecule or macromer with (b) at least three different ethylenically unsaturated monomers in the presence of (c) at least one free-radical polymerization initiator, and, optionally, (d) a liquid diluent, and, optionally, (e) a chain transfer agent.Type: GrantFiled: April 18, 2012Date of Patent: September 16, 2014Assignee: Bayer MaterialScience LLCInventors: Jiong England, Rick L. Adkins, Brian L. Neal, William Gill
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Patent number: 8623979Abstract: The present invention relates to cement dispersant that is a copolymerization product of a first monomer (A) comprising a carboxylic acid, a second monomer (B) comprising an alkoxylated allyl alcohol sulfate, and, optionally, a third monomer (C) comprising an alkoxylated allyl alcohol. The cement dispersant according to the invention provides improved slump life properties and water reduction properties in cement admixtures.Type: GrantFiled: August 8, 2007Date of Patent: January 7, 2014Assignee: GEO Speciality Chemicals, Inc.Inventors: Keith A. Blair, Arpad Savoly, Bennie Veal
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Patent number: 8586687Abstract: The present invention has an object to provide a polyalkylene glycol-based polymer having high anti-soil redeposition ability in washing treatment and having high compatibility with surfactants. The polyalkylene glycol-based polymer includes: a structure unit (a) derived from a polyalkylene glycol-based monomer (A) of a specific structure, and a structure unit (b) derived from a carboxyl group-containing monomer (B) at specific ratios.Type: GrantFiled: December 17, 2010Date of Patent: November 19, 2013Assignee: Nippon Shokubai Co., Ltd.Inventors: Atsuro Yoneda, Akiko Hemmi, Sachiko Nakanishi, Daisuke Michitaka
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Publication number: 20130267669Abstract: Provided herein are methods for the preparation of telechelic polyolefins via polymerization reaction with a terpene initiator.Type: ApplicationFiled: June 5, 2013Publication date: October 10, 2013Inventors: Casey D. Stokes, Young Chang
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Patent number: 8507641Abstract: Provided herein are methods for preparing vinylidene-terminated polyolefins. Further provided herein are sulfide-terminated polyolefins.Type: GrantFiled: February 12, 2013Date of Patent: August 13, 2013Assignee: Chevron Oronite Company LLCInventor: Casey D. Stokes
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Patent number: 8383760Abstract: Provided herein are methods for preparing vinylidene-terminated polyolefins. Further, provided herein are novel sulfide-terminated polyolefins of the formula: wherein R1 is a polyolefin group and R2 is hydrocarbyl; and methods for producing the same.Type: GrantFiled: February 14, 2012Date of Patent: February 26, 2013Assignee: Chevron Oronite Company LLCInventor: Casey D. Stokes
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Patent number: 8383733Abstract: The present invention relates to novel polymer polyols which have low viscosities and high hydroxyl numbers, and to a process for the preparation of these novel polymer polyols. These polymer polyols have hydroxyl numbers of ?20, solids contents of about 30 to about 65% by weight and a viscosity that is less than or equal to: be[2.7c]. These comprise the reaction product of a base polyol, a preformed stabilizer and at least one ethylenically unsaturated monomer, in the presence of a free-radical polymerization initiator and at least one polymer control agent. The base polyol has a hydroxyl number of 60 to 1900, a functionality of 1 to 10, and an equivalent weight of 30 to 900.Type: GrantFiled: October 31, 2011Date of Patent: February 26, 2013Assignee: Bayer MaterialScience LLCInventors: Rick L. Adkins, Shriniwas S. Chauk
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Publication number: 20120302657Abstract: Composition which contains polymerizable binder and an initiator according to the following Formula I: R1—X—O—O—[Y—O—O—-]nR2??(Formula I) and having a large through-curing depth and a sufficiently long processing time and which cures without the development of high temperatures.Type: ApplicationFiled: November 14, 2011Publication date: November 29, 2012Applicant: IVOCLAR VIVADENT AGInventors: Norbert MOSZNER, Ulrich SALZ, Peter BURTSCHER, Robert LISKA, Astrid GUGG, Christian GORSCHE
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Publication number: 20120296057Abstract: In a method for producing a water absorbent resin by drying a particulate hydrogel having a high solid content concentration (of 45% by weight or more, preferably 50% by weight or more, and more preferably 55% by weight or more), a method for efficient drying water absorbent resin having maintained/improved physical properties is provided.Type: ApplicationFiled: January 20, 2011Publication date: November 22, 2012Applicant: NIPPON SHOKUBAI CO., LTD.Inventors: Toshihiro Takaai, Shinichi Fujino, Hidenori Wada
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Patent number: 8148485Abstract: In obtaining a water-absorbing resin with high property in high productivity, produced a production method for a water-absorbing resin in high property and stably. Provided is a production method for a water-absorbing resin, comprising: a step for polymerizing an acrylic acid aqueous solution; a step for drying the resultant water-containing gel; a step for pulverizing and classifying the dried substance; and a step for surface cross-linking after classification, wherein a hopper having an inclination angle of a cone part of equal to or larger than 45 degree, and a drawing rate of 30 to 80% is used.Type: GrantFiled: March 13, 2009Date of Patent: April 3, 2012Assignee: Nippon Shokubai Co., Ltd.Inventors: Kozo Nogi, Kunihiko Ishizaki, Koji Matsumoto
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Method for producing particulate water—absorbing agent composed principally of water absorbing resin
Patent number: 8138292Abstract: Provided is a production method for the particulate water-absorbing agent, which can contribute to property enhancement, and further improvement of productivity or the like, as well. One example of the production method for the particulate water-absorbing agent relevant to the present invention includes the polymerization step for obtaining a polymer gel; the drying step for drying the polymer gel to obtain a dried substance; the pulverization step for pulverizing the dried substance or the polymer gel to obtain the particulate water-absorbing resin; the classification step for sieving the particulate water-absorbing resin; the granule sizing step for granule sizing the particulate water-absorbing agent obtained from the particulate water-absorbing resin; and the transporting step for transporting the products produced in each of the steps to other steps.Type: GrantFiled: March 13, 2009Date of Patent: March 20, 2012Assignee: Nippon Shokubai Co., Ltd.Inventors: Koji Matsumoto, Sumio Okuda, Kunihiko Ishizaki -
Patent number: 8133954Abstract: Provided herein are methods for preparing vinylidene-terminated polyolefins. Further, provided herein are novel sulfide-terminated polyolefins of the formula: wherein R1 is a polyolefin group and R2 is hydrocarbyl; and methods for producing the same.Type: GrantFiled: October 22, 2008Date of Patent: March 13, 2012Assignee: Chevron Oronite Company LLCInventor: Casey D. Stokes
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Patent number: 7985819Abstract: The present invention discloses styrene-maleic anhydride copolymers preparations using solventless techniques. The solventless method resulted in reduced amounts of residues, such as unreacted styrene and/or maleic anhydride monomers, which makes the copolymers particularly suitable for bioapplications.Type: GrantFiled: March 26, 2009Date of Patent: July 26, 2011Assignee: Exotech Bio Solutions Ltd.Inventors: Mircea Dan Bucevschi, Monica Colt
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Patent number: 7935774Abstract: An object of the present invention is to provide a method for producing a particulate water-absorbent polymer particle having remarkably improved long-term color stability, without an adverse effect (such as a delay in polymerization) on synthesis of the particulate water-absorbent polymer. The method includes the steps of polymerizing a monomer aqueous solution (B) containing (i) at least one type of monomer (A) that is capable of forming a particulate water-absorbent polymer by polymerization, (ii) at least one type of crosslinking agent, (iii) at least one type of polymerization initiator and (iv) an organophosphorus compound in an amount of not less than 1 but not more than 100 ppm by mass with respect to the monomer (A) so as to form a hydrogel polymer, and drying the hydrogel polymer.Type: GrantFiled: July 13, 2009Date of Patent: May 3, 2011Assignee: Nippon Shokubai Co., Ltd.Inventors: Hiroyuki Ikeuchi, Makoto Nagasawa
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Patent number: 7776969Abstract: This invention relates to novel ethylenically unsaturated macromers, preformed stabilizers prepared from these novel macromers, polymer polyols prepared from either the novel ethylenically unsaturated macromers or the preformed stabilizers, and to processes for the preparation of these compositions.Type: GrantFiled: December 4, 2006Date of Patent: August 17, 2010Assignee: Bayer MaterialScience LLCInventor: Rick L. Adkins
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Publication number: 20090318649Abstract: The present invention discloses styrene-maleic anhydride copolymers preparations using solventless techniques. The solventless method resulted in reduced amounts of residues, such as unreacted styrene and/or maleic anhydride monomers, which makes the copolymers particularly suitable for bioapplications.Type: ApplicationFiled: March 26, 2009Publication date: December 24, 2009Inventors: Mircea Dan Bucevschi, Monica Colt
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Publication number: 20090310285Abstract: The invention relates to a process for preparing polythiophene dispersions or for in situ deposition of polythiophenes. The dispersion is prepared by oxidative polymerizing of a thiophene or thiophene derivative, wherein an oxidizing agent is used and is at least one organic peroxidic compound excluding diacyl peroxide. The invention also relates to the use of specific organic peroxides as oxidizing agents in the oxidative polymerization of thiophenes. The invention further relates to a process to process a conductive layer and the use of the conductive layer.Type: ApplicationFiled: September 19, 2007Publication date: December 17, 2009Applicant: H.C. Starck GmbHInventors: Knud Reuter, Stephen Kirchmeyer, Udo Merker, Peter Wilfried Loevenich, Timo Meyer-Friedrichsen
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Publication number: 20090208748Abstract: According to the present invention, the manufacturing method for the water absorbing resin involves the step of polymerizing a water-soluble unsaturated monomer, 0.06 of 5 mol % of which is composed of an internal crosslinking agent; and the step of drying a water-containing gel which has a thermally decomposing radical initiator content index of 40 to 100 at 100 to 250° C. The water absorbing resin of the present invention contains a water-soluble unsaturated monomer as a repeat unit for a major chain, 90 mol % of the monomer being composed of an acrylic acid and/or salt thereof, the resin having an internal crosslinking structure and exhibiting a weight-average molecular weight Mw of 360,000 to 1,000,000 daltons and an intrinsic viscosity IV of 2.1 to 6.0 dL/g where the weight-average molecular weight Mw and the intrinsic viscosity IV are measured after treatment under set 2 of hydrolysis conditions.Type: ApplicationFiled: March 20, 2007Publication date: August 20, 2009Applicant: NIPPON SHOKUBAI CO., LTD.Inventors: Kazushi Torii, Hirofumi Shibata
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Patent number: 7504466Abstract: A process for preparing crosslinked polymer particles at high solids levels (i.e., >40 wt %). Also provided is a method for predicting whether a selection of reaction conditions for preparing crosslinked polymer particles will exhibit a potential for forming a gel and a method for predicting whether a selection of reaction conditions will or will not result in the formation of a gel.Type: GrantFiled: October 6, 2005Date of Patent: March 17, 2009Assignee: Rohm and Haas CompanyInventors: Wayne Devonport, Susan J. Fitzwater, Eric G. Lundquist
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Publication number: 20080287623Abstract: The invention relates to the use of alkylphenol disulfide accelerators in butyl and halobutyl compounds.Type: ApplicationFiled: May 17, 2007Publication date: November 20, 2008Inventors: Michael B. Rodgers, Nitin K. Tambe, Scott C. Solis, Bharat B. Sharma
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Publication number: 20080242813Abstract: This invention discloses a process for synthesizing a hairy polymer particle which comprises the steps of (1) polymerizing a vinyl aromatic monomer by emulsion polymerization in an aqueous medium to produce core particles, (2) recovering the core particles from the aqueous medium, (3) dispersing the core particles in an organic solvent, (4) adding an organo-lithium compound to the dried core particles in the organic solvent to produce the hairless core initiator, and (5) utilizing the hairless core initiator to initiate the anionic polymerization of a conjugated diolefin monomer in an organic solvent to produce a solution of the hairy polymer particles. The hairy polymer nanoparticles can then be recovered from the organic solvent. These hairy polymer particles are comprised of (1) a core which is comprised of a polymer of a vinyl aromatic monomer and (2) hairs which are polymer chains of a conjugated diolefin monomer, wherein the hairs are covalently bonded to the core.Type: ApplicationFiled: June 10, 2008Publication date: October 2, 2008Applicant: The Goodyear Tire & Rubber CompanyInventors: Lei Zheng, Eric Sean Castner, Thierry Florent Edme Materne
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Patent number: 7279542Abstract: Polymeric micro- and nano-capsules formed of a spherical single hydrophobic polymer, chemically functionalised at their surface so as to comprise hydrophilic moieties thereon are disclosed. The capsules are susceptible of absorbing a perfume and of being optionally coated with an amphiphilic copolymer. They allow the preparation of perfume delivery systems, which provide a slow release of perfuming materials while improving the substantivity of the perfume on a substrate.Type: GrantFiled: June 7, 2005Date of Patent: October 9, 2007Assignee: Firmenich SAInventors: Lahoussine Ouali, Djamila Latreche
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Patent number: 7271214Abstract: The present invention relates to cement dispersant that is a copolymerization product of a first monomer (A) comprising a carboxylic acid, a second monomer (B) comprising an alkoxylated allyl alcohol sulfate, and, optionally, a third monomer (C) comprising an alkoxylated allyl alcohol. The cement dispersant according to the invention provides improved slump life properties and water reduction properties in cement admixtures.Type: GrantFiled: June 23, 2004Date of Patent: September 18, 2007Assignee: GEO Specialty Chemicals, Inc.Inventors: Keith A. Bair, Arpad Savoly, Bennie Veal
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Patent number: 7214751Abstract: The invention relates to a method of preparing a composition of living polymers comprising a non-photoinitiated radical polymerization step using a composition consisting of: at least one ethylenically unsaturated monomer, preferably a methacrylic monomer, at least one disulphide compound having formula (II), i.e. Z1—C(?S)—S—S—C(?S)—Z2; and at least one thermally-activate free radical source which is different from the formula (II) compound.Type: GrantFiled: August 14, 2002Date of Patent: May 8, 2007Assignee: Rhodia ChimieInventor: Jean-Marie Catala
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Patent number: 6916884Abstract: The invention concerns a method for preparing a first generation polymer comprising a step which consists in radical polymerization of a composition containing: at least an ethylenically unsaturated monomer a free radical source, and at least a disulfide compound.Type: GrantFiled: September 11, 2001Date of Patent: July 12, 2005Assignee: Rhodia ChimieInventor: Mathias Destarac
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Patent number: 6869998Abstract: A dispersant for use with concrete or cement, and a concrete or cement admixture that comprises a cementitious material, water, and the dispersant. The dispersant includes a polymeric derivative of carboxylic acid, and has a sulfur-containing moiety that is covalently bonded thereto. Adding the dispersant to the cementitious material and water improves the rheological properties of the admixture.Type: GrantFiled: June 23, 2003Date of Patent: March 22, 2005Assignee: GEO Specialty Chemicals, Inc.Inventors: Keith A. Bair, Arpad Savoly, Bennie Veal
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Patent number: 6852813Abstract: In accordance with the method of manufacture described herein, it has been found that by applying a polymerization catalyst or polymerization initiator directly to a liquid-absorbent or liquid adsorbent (hereinafter collectively referred to as “liquid-sorbent”) substrate, preferably a porous geotextile in sheet material form, to form a polymerization-initiating substrate or sheet material, a monomer that is subsequently embedded in the liquid-sorbent substrate will be completely contacted by the polymerization catalyst or polymerization initiator for complete polymerization of the embedded monomer to form embedded polymer solids, without the monomer partially polymerizing before contacting the substrate. It has been found that complete polymerization of the monomer while in contact with the substrate achieves best results in retention of embedded and interlocked polymer solids.Type: GrantFiled: September 25, 2002Date of Patent: February 8, 2005Assignee: Amcol International CorporationInventors: Jerald W. Darlington, Jr., Natali A. Dotlich, Craig M. Mattern, Richard Wilson Carriker, Mark William Clarey
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Patent number: 6844406Abstract: The present invention provides novel low molecular weight, high functionality number, polymers. The polymers may be made, for example, by heating (preferably, to a temperature of between about 130° C. and 180° C.) one or more ethylenically unsaturated monomers in the presence of a substantially aprotic solvent system; and maintaining the temperature for a time sufficient to polymerize the monomers to a preferred monomer to polymer conversion percentage of at least about 95 percent by weight. In a presently preferred embodiment, the polymer has a weight average molecular weight between about 900 and 7,000 Dalton and a functionality number of at least 100. The process is also preferably substantially free of chain transfer agents.Type: GrantFiled: October 4, 2001Date of Patent: January 18, 2005Assignee: Valspar Sourcing, Inc.Inventors: John H. Mazza, Jeffrey Niederst, Thomas R. Mallen
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Publication number: 20040259982Abstract: A dispersant for use with concrete or cement, and a concrete or cement admixture that comprises a cementitious material, water, and the dispersant. The dispersant includes a polymeric derivative of carboxylic acid, and has a sulfur-containing moiety that is covalently bonded thereto. Adding the dispersant to the cementitious material and water improves the rheological properties of the admixture.Type: ApplicationFiled: June 23, 2003Publication date: December 23, 2004Inventors: Keith A. Bair, Arpad Savoly, Bennie Veal
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Publication number: 20040204553Abstract: The invention relates to a method of preparing a composition of living polymers comprising a non-photoinitiated radical polymerisation step using a composition consisting of: at least one ethylenically unsaturated monomer, preferably a methacrylic monomer, at least one disulphide compound having formula (II), i.e. Z1—C(═S)—S—S—C(═S)—Z2; and at least one thermally-activate free radical source which is different from the formula (II) compound.Type: ApplicationFiled: February 23, 2004Publication date: October 14, 2004Inventor: Jean-Marie Catala
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Patent number: 6800709Abstract: A method has been described of preparing monodisperse polymer particles by free radical polymerization or copolymerization of hydrophobic monomers in a water-based system in the presence of cyclodextrin, characterized in that said free radical polymerization is performed with semi-continuous addition of monomer, wherein said monomer is absent before initiating polymerization, and in that a total solid contents of less than 30% by weight is present in said water-based system, in order to provide monodisperse polymer particles which are very suitable for use in many applications as e.g. in inks or toners, in photonic crystal films, in thermal printing plates for computer-to-plate or computer-to-press applications, in inkjet media, in displays, in photographic films, or as a spacing agent.Type: GrantFiled: March 6, 2002Date of Patent: October 5, 2004Assignee: AGFA-Gevaert N.V.Inventors: Huub Van Aert, Joachim Storsberg, Helmut Ritter, Christiaan Van Roost
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Patent number: 6756457Abstract: A process for polymerization of vinyl monomers is described comprising polymerizing vinyl monomers in the presence of of an initiating system comprising (i) an organic sulfur compound and (ii) an onium salt catalyst. The present invention provides a novel method for living polymerization of vinyl monomers, which provides a high level of macromolecular control over the polymerization process and which leads to uniform and controllable polymeric products.Type: GrantFiled: July 16, 2002Date of Patent: June 29, 2004Assignee: Eastman Kodak CompanyInventor: Jin-Shan Wang
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Publication number: 20040059013Abstract: The invention relates to a photocurable resin composition comprising: (A) a di or more functional urethane (meth)acrylate compound; (B) a monofunctional (meth)acrylate; (C) a photoinitiator; and (D) a polyoxyalkylene alkyl ether phosphate represented by the following formula (2): 1Type: ApplicationFiled: July 12, 2002Publication date: March 25, 2004Inventors: Takayoshi Tanabe, Jiro Ueda, Tetsuya Yamamura, Takashi Ukachi
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Patent number: 6689851Abstract: The subject invention is directed to a rheology-modified ethylene polymer having less than 0.5 weight percent gel, a composition distribution breadth index (CDBI) greater than 50 percent, and a molecular weight distribution (Mw/Mn) of less than 4.0, which is characterized as having improved rheological performance and/or melt strength attributes relative to the unmodified polymer. The subject invention is further directed to polymer blends which comprise the rheology-modified polymers, and to a process for preparing the rheology-modified polymers.Type: GrantFiled: July 11, 2000Date of Patent: February 10, 2004Assignee: Dow Global Technologies Inc.Inventors: Michael E. Rowland, Robert R. Turley, James J. Hill, Lawrence T. Kale, Kyle G. Kummer, Shih-Yaw Lai, Pak-Wing Steve Chum
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Publication number: 20040014919Abstract: A process for polymerization of vinyl monomers is described comprising polymerizing vinyl monomers in the presence of of an initiating system comprising (i) an organic sulfur compound and (ii) an onium salt catalyst. The present invention provides a novel method for living polymerization of vinyl monomers, which provides a high level of macromolecular control over the polymerization process and which leads to uniform and controllable polymeric products.Type: ApplicationFiled: July 16, 2002Publication date: January 22, 2004Applicant: Eastman Kodak CompanyInventor: Jin-Shan Wang
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Publication number: 20030187165Abstract: The invention concerns a method for preparing a first generation polymer comprising a step which consists in radical polymerization of a composition containing: at least an ethylenically unsaturated monomer a free radical source, and at least a disulfide compound.Type: ApplicationFiled: March 12, 2003Publication date: October 2, 2003Inventor: Mathias Destarac
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Patent number: 6624263Abstract: A new polymerization process (atom transfer radical polymerization, or ATRP) based on a redox reaction between a transition metal (e.g., Cu(I)/Cu(II), provides “living” or controlled radical polymerization of styrene, (meth)acrylates, and other radically polymerizable monomers. Using various simple organic halides as model halogen atom transfer precursors (initiators) and transition metal complexes as a model halogen atom transfer promoters (catalysts), a “living” radical polymerization affords (co)polymers having the predetermined number average molecular weight by &Dgr;[M]/[I]0 (up to Mn>105) and a surprisingly narrow molecular weight distribution (Mw/Mn), as low as 1.15. The participation of free radical intermediates in ATRP is supported by end-group analysis and stereochemistry of the polymerization. In addition, polymers with various topologies (e.g.Type: GrantFiled: March 13, 2002Date of Patent: September 23, 2003Assignee: Carnegie Mellon UniversityInventors: Krzysztof Matyjaszewski, Jin-Shan Wang
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Publication number: 20030073793Abstract: A process for the preparation of polymers is described, wherein at least one first ethylenically unsaturated monomer is subjected to a free radical polymerization in the presence of stable free radicals or sources of stable free radicals and of a compound having at least one free thiol group to give a polymer, and wherein the molar ratio of compound having a free thiol group to stable free radicals is from 0.05 to 1.1.Type: ApplicationFiled: September 27, 2002Publication date: April 17, 2003Inventors: David Christie, Sylke Haremza, Susanne Brinkmann-Regel, Roman Benedikt Raether
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Patent number: 6486281Abstract: A process for preparing a high purity vinylpyrrolidone polymer which dissolves clearly in an organic solvent can be provided. The process for preparing a high purity vinylpyrrolidone polymer, wherein vinylpyrrolidone is polymerized by using a redox initiator comprising an organic peroxide and a sulfite, and thereafter the product is contacted with an anion exchange resin to be purified.Type: GrantFiled: August 24, 2001Date of Patent: November 26, 2002Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.Inventors: Akira Kitada, Keiichi Fujise, Itsuko Hamaguchi
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Patent number: 6344523Abstract: The invention provides a method for promoting the curing reactions of an acetylenic oligomer or polymer, characterized in that the oligomer or polymer is cured in the presence of sulfur or an organic sulfur derivative which is capable of lowering the temperature of cure of the oligomer or polymer. The invention also provides a process for producing a polyimide oligomer or polymer containing an aliphatic or aromatic disulfide moiety which is covalently bound to, and forms an integral part of the oligomer or polymer and which is capable of lowering the temperature of cure of the oligomer or polymer, characterised in that a suitable amount of a diamino-disulfide or dianhydride-disulfide, or any suitable derivative or precursor thereof, is introduced into the mixture of aromatic diamines, tetracarboxylic dianhydrides, and the phenylethynyl-substituted amine or anhydride normally used for the reparation of the oligo-imide.Type: GrantFiled: December 10, 1999Date of Patent: February 5, 2002Assignees: Commonwealth Scientific and Industrial Research Organization of Campbell, The Boeing CompanyInventors: David Geoffrey Hawthorne, Jonathan Howard Hodgkin
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Patent number: 6255422Abstract: The invention relates to a process for the polymerization or copolymerization of at least one monomer which can be polymerized or copolymerized by the radical route in the presence of a stable free radical and of an iniferter. The presence of the stable free radical greatly modifies the behavior of the iniferter during the polymerization or copolymerization, so that undesirable reactions are much reduced. It is possible, rapidly and with a high yield, to polymerize or copolymerize in the presence of an iniferter in order to result in a polymer or copolymer with a reduced polydispersity and with a monomodal molecular mass distribution.Type: GrantFiled: November 19, 1997Date of Patent: July 3, 2001Assignee: ATOFINAInventors: Denis Bertin, Bernard Boutevin, Pascal Nicol
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Patent number: 6160070Abstract: Disclosed is a process for the preparation of a poly-(meth)acrylate ester, which comprises, upon polymerization of a (meth)acrylate ester by using an organometallic compound ((C.sub.5 Me.sub.5).sub.2 SmMe(thf) or the like) having at least one polymerization initiating site, carrying out the polymerization in the presence of a compound (acetophenone, 4-methyl-2-pentanone or the like), which contains in the molecule thereof a reactive hydrogen atom, as a chain transfer agent. The above-described process makes it possible to control the molecular weight easily, reduce the using amount of the organometallic compound, prevent the coloring of the poly(meth)acrylate ester and improve thermal decomposition resistance.Type: GrantFiled: January 25, 1999Date of Patent: December 12, 2000Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Akira Yanagase, Seiji Tone, Toru Tokimitsu, Mitsufumi Nodono
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Patent number: 5880232Abstract: There is provided a process for producing a styrene based polymer by polymerizing a styrene compound, the process including the step of continuously feeding a styrene compound and one or more sulfide compounds to a reaction zone. The sulfide compounds include dithiocarbamate group-containing sulfide compounds, aryl or arylalkyl group-containing sulfide compounds and thiazole group-containing sulfide compounds. The polymerization is carried out under stirring conditions to maintain the composition of the reaction mixture in the reaction zone uniform and at a predetermined conversion within a range of from 40 to 80% by weight. Polymerization reaction mixture is continuously removed from the reaction zone. The styrene based polymer produced is narrow in molecular weight distribution, and excellent in flowability, mechanical strength and heat resistance.Type: GrantFiled: March 26, 1997Date of Patent: March 9, 1999Assignee: Sumitomo Chemical Company, Ltd.Inventors: Masayuki Fujita, Takahiro Ishii
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Patent number: 5847061Abstract: A process for producing polymers having terminal functional group which may be protected, comprises polymerizing a radical-polymerizable monomer with a polymerization initiator comprising at least one member selected from the group (A) consisting of thio-S-carboxylic acids represented by the following general formula (1) and dithiocarboxylic acids represented by the following general formula (2) and at least one member selected from the group (B) consisting of polysulfides represented by the following general formula (3), polysulfides represented by the following general formula (4) and sulfoxides:. ##STR1## wherein R.sup.1 represents a hydrocarbon group which may have a substituent including functional group; ##STR2## wherein R.sup.2 represents a hydrocarbon group which may have a substituent including functional group; ##STR3## wherein R.sup.3 and R.sup.4 each represents a hydrocarbon group which may have a substituent including functional group and n is an integer of 2 or more; andR.sup.5 --(S)m-R.sup.Type: GrantFiled: November 21, 1995Date of Patent: December 8, 1998Assignee: Kuraray Co., Ltd.Inventors: Kazuhiko Maekawa, Toshiaki Sato
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Patent number: 5773544Abstract: Crystalline polychloroprene compositions comprise mercaptan-modified or xanthogen disulfide-modified 2-chloro-1,3-butadiene homopolymers having gel contents of 5-80 percent by weight. The polymers are prepared by free radical emulsion polymerization at a temperature of 5.degree.-20.degree. C. to a conversion of 70-95 percent in the presence of 2.5.times.10.sup.-4 -5.5.times.10.sup.-4 moles of mercaptan or xanthogen disulfide modifier per mole of 2-chloro-1,3-butadiene.Type: GrantFiled: January 10, 1997Date of Patent: June 30, 1998Assignee: Dupont Dow ElastomersInventors: Lance Alan Christell, Richard Misak Tabibian
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Patent number: RE36618Abstract: Polychloroprene latex adhesive compositions which comprise a) mercaptan-modified or xanthogen disulfide-modified 2-chloro-1,3-butadiene homopolymers having gel contents of 5-.[.70.]..Iadd.78.7 .Iaddend.percent by weight, b) 1 to 75 parts by weight of rosin per 100 parts by weight of a), and c) sufficient water to provide a solids content of 25-65 weight percent based on the weight of component a) exhibit excellent heat resistance and green bond strength.Type: GrantFiled: November 26, 1997Date of Patent: March 14, 2000Assignee: DuPont Dow Elastomers, L.L.C.Inventors: Lance Alan Christell, Richard Misak Tabibian