Patents Examined by N. Sarofim
  • Patent number: 5919603
    Abstract: In an additive process for producing printed wiring boards, by using a developer comprising a chlorine-free organic solvent and an alkaline aqueous solution and as a resist material a copolymer of methacrylic acid and methyl methacrylate or the like, the production steps are simplified even if a substrate having a large area is used, and abolishment of chlorine-containing organic solvent as a developer becomes possible.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: July 6, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Masashi Miyazaki, Haruo Akahoshi, Shozo Nohara, Kenzi Kikuta, Toshiaki Ishimaru
  • Patent number: 5916963
    Abstract: A water-based resin dispersion having excellent durability against water, obtained by radical-polymerizing a radical-polymerizable ethylenically unsaturated monomer, a dimethylpolysiloxane having a molecule containing a radical-polymerizable unsaturated double bond and a radical-polymerizable monomer of the formula (A) or (B) in the presence of a reactive emulsifier, an oil-soluble polymerization initiator and water, and a process for the production thereof, ##STR1## wherein R.sub.1 is (C.sub.2 H.sub.5 O).sub.2 or (CH.sub.3 O).sub.2, and R.sub.2 is (C.sub.2 H.sub.5 O).sub.3 or (CH.sub.3 O).
    Type: Grant
    Filed: August 4, 1997
    Date of Patent: June 29, 1999
    Assignee: Toyo Ink Manufacturing Co., Ltd.
    Inventors: Tomio Hashimoto, Tsuyoshi Kitamoto
  • Patent number: 5916971
    Abstract: A graded-refractive-index optical plastic material composed of an amorphous fluoropolymer (a) which has substantially no C--H bond and at least one material (b) which has substantially no C--H bond and differs from the fluoropolymer (a) in refractive index by at least 0.001, wherein the material (b) is distributed in the fluoropolymer (a) so as to have a concentration gradient in a specific direction, and the optical plastic material has a glass transition temperature which is substantially uniform throughout it.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: June 29, 1999
    Assignee: Yasuhiro Koike
    Inventors: Yasuhiro Koike, Hidenobu Murofushi, Norihide Sugiyama
  • Patent number: 5914379
    Abstract: A process for compressing ethylenically unsaturated monomers at a pressure of 200-5000 bar in the absence of a polymerization initiator comprises carrying out compression in the presence of a sterically hindered amine derivative.
    Type: Grant
    Filed: October 16, 1998
    Date of Patent: June 22, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Friedrich Sutoris, Alexander Aumuller, Andreas Koch, Andreas Deckers, Eckard Schauss, Roger Klimesch, Arend Jouke Kingma, Wilhelm Weber
  • Patent number: 5914380
    Abstract: Toner resin consisting of a polymer which comprises (a) an aromatic vinyl unit, (b) an acrylic or methacrylic compound unit and (c) a polyfunctional compound unit, and which has a tetrahydrofuran insoluble content of 5-60%, a maximum peak molecular weight of no more than 20,000 in the molecular weight distribution of the tetrahydrofuran soluble portion as measured by gel permeation chromatography, and a weight average polymerization degree of no more than 180, as well as a process for its production. The resulting toner resin has an excellent fixing property, non-offsetting property, blocking resistance and image stability.
    Type: Grant
    Filed: July 2, 1997
    Date of Patent: June 22, 1999
    Assignee: Mitsubishi Rayon Company Ltd.
    Inventors: Hirokazu Ito, Hitoshi Iwasaki, Noriyuki Tajiri
  • Patent number: 5912312
    Abstract: Homogeneous copolymers of 60-99 mole % of vinyl pyrrolidone (VP) and 1-40 mole % 2-methylene-1,3-dioxepane (MDO), preferably 85-95 mole % VP and 5-10 mole % MDO, having a K-value of about 30-50, and a Tg of about 124-138.degree. C., are described herein. The copolymers are hydrolytically degradable in aqueous acid or basic solutions and biodegradable.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: June 15, 1999
    Assignee: ISP Investments Inc.
    Inventors: Yuanzhen Zhong, Philip F. Wolf, Edward G. Malawer, Kolazi S. Narayanan
  • Patent number: 5910554
    Abstract: A polymer useful as a solid support for a variety of applications is provided. The polymer is prepared from a composition comprising at least one type of olefinic monomer and a multifunctional (meth)acrylate crosslinker of the following formula (I): ##STR1## wherein: (a) R.sup.1, R.sup.2, and R.sup.3 are each independently hydrogen or a methyl group;(b) R.sup.4 is hydrogen or an organic group or substituent that can interact in the polymerization and/or crosslinking process or is nonreactive under the conditions of the polymerization and/or crosslinkling process;(c ) R.sup.7, R.sup.8, and R.sup.9 are each independently --CH.sub.2 --CH.sub.2 --, --CH.sub.2 --CH.sub.2 --CH.sub.2, --CH.sub.2 --CH(CH.sub.3)--, or --CH(CH.sub.3)--CH.sub.2 --;(d) each of 1, m, and n is no greater than about 100 with the proviso that at least one of 1, m, or n is at least 1.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: June 8, 1999
    Assignee: Regents Of The University Of Minnesota
    Inventors: Maria Kempe, George Barany
  • Patent number: 5910549
    Abstract: An improved process for free radical polymerization is produced making it possible to control the growth steps of a polymerization to produce homopolymers and copolymers, including block and graft copolymers. The process uses a long half-life radical initiators and compounds which have the structure of formula I ##STR1## wherein X is a group having at least one carbon atom and is such that the free radical X is capable of polymerizing the unsaturated monomer by free radical polymerization, and the radical functionality resides on the or one of the carbon atoms, R.sup.1, R.sup.2, R.sup.5 and R.sup.6 represent the same or different straight chain or branched substituted or unsubstituted alkyl groups of a chain length sufficient to provide steric hindrance and weakening of the O--X bond, and R.sup.3 and R.sup.4 represent the same or different, straight chain or branched, substituted alkyl groups or R.sup.3 CNCR.sup.
    Type: Grant
    Filed: August 22, 1996
    Date of Patent: June 8, 1999
    Assignee: Carnegie-Mellon University
    Inventors: Krzysztof Matyjaszewski, Dorota Greszta
  • Patent number: 5910552
    Abstract: A novel fluorine-containing copolymer elastomer having bromine groups as cross-linkable groups, which comprises about 45 to about 80% by mole of tetrafluoroethylene, about 50 to about 20% by mole of a perfluoro(vinylether) represented by the following general formula:CF.sub.2 .dbd.CFO(CF.sub.2).sub.2 (OCF.sub.2)nOCF.sub.3where n is an integer of 1 to 5, and about 0.2 to about 5% by mole of a bromine-containing unsaturated monomer compound, sum total being 100% by mole, gives vulcanization products having distinguished resistances to chemicals, low temperature and heat.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: June 8, 1999
    Assignee: Nippon Mektron, Limited
    Inventors: Satoru Saito, Haruyoshi Tatsu
  • Patent number: 5908906
    Abstract: Monomeric units useful in reducing the modulus of hydrogels are disclosed. Silicone hydrogels including the subject monomeric units are especially useful in the formation of biomedical articles such as silicone hydrogel contact lenses. ##STR1## wherein: A is an activated unsaturated group;R and D independently are alkyl, alkylene or haloalkyl groups having 1 to 10 carbon atoms wherein said carbon atoms may include ether linkages therebetween;R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently selected from: alkyl or haloalkyl groups wherein ether linkages may be included between carbon atoms; siloxane groups, and carbocyclic ring groups having from 6 to 18 carbon atoms;m is an integer from 1 to 500; n is an integer from 1 to 20; x and y are 0 or 1;z is 1 or 2; and x+y+z=3;so long as at least one of R.sub.1 or R.sub.2 is an alkyl group having from 1 to 10 carbon atoms.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: June 1, 1999
    Assignee: Bausch & Lomb Incorporated
    Inventors: Jay F. Kunzler, Richard M. Ozark
  • Patent number: 5908892
    Abstract: An anionic polyacrylamide pretreatment for a metal surface which enhances corrosion resistance and surface adhesion properties is described. The pretreatment is stable at extreme pH's and compatible with other water soluble polymers. The anionic polyacrylamide includes mono- or di-alkyl substitutions on the N group of the polyacrylamide.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: June 1, 1999
    Assignee: BetzDearborn Inc.
    Inventors: Jiangbo Ouyang, Jen-Chi Chen
  • Patent number: 5908908
    Abstract: This pressure-sensitive adhesive polymer is obtained by emulsion polymerization of the mixture of the following monomers, for a total of 100% by weight: (A) 40 to 95% by weight of at least one (meth)acrylic or vinyl monomer capable of resulting in a homopolymer which has a glass transition temperature lower than or equal to -40.degree. C.; (B) 2 to 50% by weight of at least one (meth)acrylic or vinyl monomer capable of resulting in a homopolymer which has a glass transition temperature higher than or equal to 0.degree. C.; (C) 0.5 to 6% by weight of at least one carboxylic (meth)acrylic monomer; (D) 0 to 5% by weight of at least one (meth)acrylic monomer ethoxylated with 1 to 20 moles of ethylene oxide; (E) 0.05 to 1% by weight of at least one (meth)acrylic or vinyl monomer containing a ureido group; and (F) 0 to 2% by weight of at least one acrylic or vinyl monomer carrying a sulphonate functional group, the said polymer having a glass transition temperature lower than or equal to -25.degree. C.
    Type: Grant
    Filed: July 30, 1997
    Date of Patent: June 1, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Didier Vanhoye, Denis Melot, Jean Lebez, Cyril Wiegert
  • Patent number: 5907022
    Abstract: A process for the preparation of (co)polymers employing a peroxide composition comprising at least one organic peroxide wherein at least 20% of the total active oxygen content of said organic peroxide is attributable to one or more cyclic ketone peroxides represented by the following formulas I-III: ##STR1## These cyclic ketone peroxides are highly efficient as polymerization initiators.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: May 25, 1999
    Assignee: Akzo Nobel nv
    Inventors: Leonie Arina Stigter, John Meijer, Andreas Petrus van Swieten
  • Patent number: 5902859
    Abstract: The invention relates to an elastic fluorohydrocarbon resin. This resin is obtained by graft copolymerization of a first segment which is one of fluorine-containing elastomeric and crystalline polymers with a second segment which is the other of these polymers. The first segment is prepared by copolymerizing at least one first unsaturated monomer that has peroxy bond with at least one second fluorine-containing monomer. When the first monomer is dissolved in a first solvent prior to the copolymerization, the copolymerization can be safely conducted with higher yield. This first solvent is selected from a carboxylic ester of t-butanol, methylene chloride, 1,1,1-trichloroethane, and first, second, third and fourth compounds which are respectively represented by R.sup.1 COOR.sup.2, C.sub.2 H.sub.x Cl.sub.y F.sub.z, C.sub.3 H.sub.x Cl.sub.y F.sub.z, and C.sub.4 H.sub.x Cl.sub.y F.sub.z.
    Type: Grant
    Filed: June 23, 1997
    Date of Patent: May 11, 1999
    Assignee: Central Glass Company, Limited
    Inventors: Chikashi Kawashima, Akira Ishihara, Katunori Kawamura, Seiiti Minegishi
  • Patent number: 5902868
    Abstract: A novel fluorine-containing copolymer elastomer having bromine groups as cross-linkable groups, which comprises about 45 to about 80% by mole of tetrafluoroethylene, about 50 to about 20% by mole of a perfluoro(vinylether) represented by following general formula:CF.sub.2 .dbd.CFO(CF.sub.2).sub.2 (OCF.sub.2)nOCF.sub.3where n is an integer of 1 to 5, and about 0.2 to about 5% by mole of a bromine-containing unsaturated monomer compound, sum total being 100% by mole, gives vulcanization products having distinguished resistances to chemicals, low temperature and heat.
    Type: Grant
    Filed: October 22, 1997
    Date of Patent: May 11, 1999
    Assignee: Nippon Mektron, Limited
    Inventors: Satoru Saito, Haruyoshi Tatsu
  • Patent number: 5900470
    Abstract: Denture adhesive including a solvent-free, high molecular weight terpolymer of maleic anhydride, a C.sub.1 -C.sub.4 alkyl vinyl ether and isobutylene.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: May 4, 1999
    Assignee: ISP Investments Inc.
    Inventors: William E. Prosise, Krystyna Plochocka
  • Patent number: 5900517
    Abstract: Cyclopentadienyl derivatives are described having general formula (I) ##STR1## where R, R.sub.1, R.sub.2, R.sub.4, equivalent to or different from one another, are selected from: --H, alkyl radicals having a number of carbon atoms from 1 to 5, cycloalkyl radicals having a number of carbon atoms from 5 to 8, aryl and alkylaryl radicals having a number of carbon atoms from 6 to 8, aralkyl radicals having a number of carbon atoms from 7 to 9; n is an integer from 2 to 18; with the proviso that the number of R different from H does not exceed 2; with the exclusion of the compound having n=3, R.dbd.R.sub.1 .dbd.R.sub.2 .dbd.R.sub.4 .dbd.H. The invention a-so describes the process for the preparation of the above-mentioned cyclopentadienyl derivatives.
    Type: Grant
    Filed: August 12, 1996
    Date of Patent: May 4, 1999
    Assignee: Enichem S.p.A.
    Inventors: Paolo Biagini, Roberto Santi, Giampiero Borsotti, Gabriele Lugli, Viviano Banzi
  • Patent number: 5898054
    Abstract: A peroxide-vulcanizable fluorine-containing elastomer containing iodines as cross-linking sites, capable of producing vulcanization products having a distinguished heat resistance is produced by polymerization reaction of a fluorinated olefin having 2 to 8 carbon atoms in the presence of a diiodide compound represented by the following general formula:I--R--where R is a divalent fluorohydrocarbon group, chlorofluorohydrocarbon group or hydrocarbon group, having 2 to 8 carbon atoms, respectively, and 2,2-difluoroiodoethylene.
    Type: Grant
    Filed: November 28, 1997
    Date of Patent: April 27, 1999
    Assignee: Nippon Mektron, Limited
    Inventors: Satoru Saito, Kuniyoshi Kawasaki, Haruyoshi Tatsu
  • Patent number: 5898055
    Abstract: The present invention provides a method for producing a methyl methacrylate polymer, wherein monomers containing methyl methacrylate as a main component are bulk-polymerized or solution-polymerized in the presence of a polymerization initiator and mercaptan compound as a chain transfer agent to form a liquid polymer composition containing unreacted monomers and then a volatile content is separated from the liquid polymer composition, the method comprising the steps of: distilling the volatile content to recover unreacted monomers, (1) subjecting the residue to a contact treatment with hydrazine compound or (2) subjecting the residue to an azeotropic distillation with water to remove impurities, distilling the resultant to recover the mercaptan compound and reusing the mercaptan compound as the chain transfer agent of raw materials.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: April 27, 1999
    Assignee: Sumitomo Chemical CO., LTD.
    Inventors: Osamu Moriya, Koji Yano, Ikuo Morisada
  • Patent number: 5895799
    Abstract: An aqueous microemulsion polymerization procedure is described in which very small colloidal polymer particles are produced from tetrafluoroethylene monomer. The polymerization procedure involves adding a free-radical initiator to a mixture of a microemulsion of at least one liquid saturated organic compound; and tetrafluoroalkyl ethylene.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: April 20, 1999
    Assignee: W. L. Gore & Associates, Inc.
    Inventors: Huey Shen Wu, Jack Hegenbarth, Xin Kang Chen, Jian Guo Chen