Patents Represented by Attorney, Agent or Law Firm Alexander Weitz
  • Patent number: 6469115
    Abstract: A method for preparing a moisture-curable, virtually telechelic, silyl-functional polyisobutylene is disclosed, said method comprising reacting, in the presence of a Lewis acid, (A) isobutylene; (B) an initiator of the formula (C) a styryl comonomer of the formula wherein R is selected from H or methyl group, R′ is a divalent non-aromatic hydrocarbon group having 1 to 6 carbon atoms, R″ is independently selected from alkyl groups having 1 to 10 carbon atoms or aryl groups having 6 to 10 carbon atoms, R′″ is a divalent non-aromatic hydrocarbon group having 2 to 6 carbon atoms, X is independently a halogen group, Y is halogen and n is independently 1, 2 or 3.
    Type: Grant
    Filed: May 16, 2000
    Date of Patent: October 22, 2002
    Assignees: Dow Corning Corporation, University of Massachusetts Lowell
    Inventors: Rudolf Faust, Savvas E. Hadjikyriacou, Aroop Kumar Roy, Toshio Suzuki
  • Patent number: 6447845
    Abstract: A process for treating a surface of a substrate to improve the oxygen, carbon dioxide, flavor and odor gas barrier properties of the substrate with an organic acid having at least two acid substituents selected from the group consisting of a polybasic carboxylic acid, a polymer of an unsaturated carboxylic acid and a co-polymer of an unsaturated carboxylic acid, by applying the acid on to the substrate to form a layer, and exposing the layer to moisture. A variety of other types of additives may be included in the coating applied to the substrate with the acid including compounds of the formula RaX3−aSi(CH2)nY, a condensation catalyst, a solvent, and/or a filler.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: September 10, 2002
    Assignees: Dow Corning Corporation, Dow Corning S.A., EG Technology Partners, L.P.
    Inventors: Shrenik Mahesh Nanavati, John E. Wyman, Patrick Jacques Jean Merlin, Laurence Gallez
  • Patent number: 6420485
    Abstract: There is disclosed a silylated copolymer which is the reaction product of: (A) an olefin copolymer prepared from at least 50 mole percent of at least one C4 to C7 isomonoolefin monomer and at least one vinyl aromatic monomer; (B) a siloxane having the formula Q-SiR2(OR2Si)n″SiR′Y2  wherein Q is a monovalent group selected from hydrogen or an olefinically unsaturated hydrocarbon group having 2 to 8 carbon atoms, R is an alkyl group having 1 to 4 carbon atoms, R″ is a divalent hydrocarbon group having 1 to 6 carbon atoms, Y is a hydrolyzable organic group, R′ is selected from R or Y and n is an integer having a value of 1 to 9; and (C) a free radical generator.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: July 16, 2002
    Assignee: Dow Corning Corporation
    Inventors: Toshio Suzuki, Anne Katja Shim
  • Patent number: 6417293
    Abstract: The present invention, therefore, relates to a method for preparing a thermoplastic elastomer, said method comprising: (I) mixing (A) a thermoplastic resin comprising more than 50 percent by volume of a polyester resin other than poly(butylene terephthalate), said thermoplastic resin having a softening point of 23° C. to 300° C., (B) a silicone elastomer comprising (B′) 100 parts by weight of a diorganopolysiloxane gum having a plasticity of at least 30 and having an average of at least 2 alkenyl groups in its molecule and, optionally, (B″) up to 200 parts by weight of a reinforcing filler, the weight ratio of said silicone elastomer (B) to said thermoplastic resin (A) being greater than 35:65 to 85:15, (C) 0.
    Type: Grant
    Filed: December 4, 2000
    Date of Patent: July 9, 2002
    Assignee: Dow Corning Corporation
    Inventors: Igor Chorvath, Craig Steven Gross, Kenneth Gerard Gruszynski, Michael Kang-Jen Lee, Jun Liao, Koji Nakanishi, Richard Leroy Rabe, David Joseph Romenesko
  • Patent number: 6380316
    Abstract: A copolymer of isobutylene with 0.5 to 15 mole percent of a conjugated diene (i.e., a butyl rubber) is reacted with a silane having both an alkenyl group as well as at least two silicon-bonded hydrolyzable group, the reaction taking place in the presence of a free-radical generator, to provide a modified copolymer having reactive silyl groups grafted thereto. The modified copolymer exhibits a reduced molecular weight relative to the starting copolymer and may be used to formulate moisture-curable sealants, caulks, adhesive and coatings.
    Type: Grant
    Filed: March 2, 1999
    Date of Patent: April 30, 2002
    Assignees: Dow Corning Corporation, ExxonMobil Chemical Patents Inc.
    Inventors: Maneesh Bahadur, David Yen-Lung Chung, Toshio Suzuki, Raymond Lee Tabler, Hsien-Chang Wang
  • Patent number: 5955536
    Abstract: There is disclosed a method for treating and protecting a substrate, said method comprising coating the surface of said substrate with a composition comprising a blend of(A) a polydimethylsiloxane polymer having a viscosity at 25.degree. C. of 5 to 100,000 cS; and(B) a polyisobutylene oligomer having a number average molecular weight of 200 to 550. The treatment imparts an aesthetically pleasing appearance to the surfaces of plastic, rubber or leather substrates whereby surface gloss is enhanced, but not excessively, as is the case for a comparable all-silicone treating agent.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 21, 1999
    Assignee: Dow Corning Corporation
    Inventors: Paul Joseph Popa, Linda Denise Kennan, Thomas Matthew Gentle, Dale Earl Hauenstein
  • Patent number: 5874388
    Abstract: There is disclosed a composition which is particularly suited for lubricating the contact area between the guide pin and elastomeric bushing of a disc brake caliper assembly, said composition consisting essentially of:(A) 55 to 90 weight percent of a polydimethylsiloxane having a viscosity of at least 1,000 cS at 25.degree. C.;(B) 5 to 45 weight percent of a polytetrafluoroethylene powder;(C) 5 to 45 weight percent of melamine cyanurate;(D) 0.1 to 5 weight percent of an antioxidant; and(E) 0.1 to 5 weight percent of magnesium oxide.
    Type: Grant
    Filed: April 2, 1997
    Date of Patent: February 23, 1999
    Assignee: Dow Corning Corporation
    Inventor: Chris Jinfuh Hsu
  • Patent number: 5756568
    Abstract: There is disclosed a composite powder composition which has excellent flowability and water repellency and finds utility as a modifier for paints and organic resins, said composition comprising:(A) 100 parts by weight of a cured silicone powder that has an average particle size of 0.1 to 100 micrometers and contains a non-crosslinking silicone oil; and(B) 0.1 to 100 parts by weight of a microfine inorganic powder, said inorganic powder being coated on the surface of said cured silicone powder.
    Type: Grant
    Filed: November 13, 1996
    Date of Patent: May 26, 1998
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Yoshitsugu Morita, Atsushi Sasaki
  • Patent number: 5744541
    Abstract: There is disclosed a method for the preparation of a copolymer of polypropylene and organopolysiloxane, the method comprising heating a solution of an .alpha., .omega.-diene-propylene polymer and an organohydrido polysiloxane having on average at least two SiH groups in one molecule at a temperature below the boiling point of the solvent. Preferably, the .alpha., .omega.-diene-propylene polymer is obtained by subjecting polypropylene to thermal decomposition in an inert atmosphere at a pressure below atmospheric pressure.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: April 28, 1998
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Takashi Sawaguchi, Manabu Seno, Teruhito Maruyama
  • Patent number: 5741859
    Abstract: The present invention relates to a method for preparing a polyisobutylene-siloxane block copolymer, said method comprising:(I) lithiating(A) a polyisobutylene having one or two terminal silanol groups with(B) an organolithium compound;(II) reacting the silanolate-functional polyisobutylene obtained in step (I) with(C) a hexaorganocyclotrisiloxane; and(III) capping the siloxanotate-functional block copolymer obtained in step (II) with a compound selected from(D) a silane having at least one hydrolyzable group or(E) an acid.
    Type: Grant
    Filed: February 3, 1997
    Date of Patent: April 21, 1998
    Assignee: Dow Corning Corporation
    Inventors: Anil Kumar Saxena, Toshio Suzuki
  • Patent number: 5708067
    Abstract: There is disclosed a heat resistant organopolysiloxane composition comprising:(A) 100 parts by weight of an organopolysiloxane having a viscosity of 100 to 1,000,000 centistokes at 25.degree. C.;(B) 0.001 to 10 parts by weight of a reaction product of an alkali metal silanolate compound with cerium chloride or a cerium carboxylate; and(C) a diorganopolysiloxane having silicon-bonded hydrogen groups only at its molecular chain terminals, component (C) being present in a quantity sufficient to provide 1 to 10,000 parts per million of silicon-bonded hydrogen based on the total weight of said composition.
    Type: Grant
    Filed: December 26, 1996
    Date of Patent: January 13, 1998
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Shoji Akamatsu, Haruhiko Furukawa, Toshinori Watanabe
  • Patent number: 5690860
    Abstract: The invention relates to a particulate silica or particulate titania which is treated with a cyclic polysiloxane having the formula ##STR1## in which Me represents a methyl radical and R is an alkyl group having 2 to 12 carbon atoms, The treated particles can be uniformly dispersed in a non-polar organic medium to provide a system having greater stability than similar prior art dispersions,
    Type: Grant
    Filed: December 4, 1995
    Date of Patent: November 25, 1997
    Assignee: Dow Corning Corporation
    Inventor: Gary Edward LeGrow
  • Patent number: 5665828
    Abstract: The invention relates to a polybutylene polymer or oligomer which contains in its molecule at least one acryl group, said polybutylene being prepared by reacting(A) an anhydride-functional polybutylene, or derivative thereof, with(B) an acryl-functional compound having at least one hydroxyl-containing group, chlorine, isocyanate group, epoxy group or amine group in its molecule.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: September 9, 1997
    Assignee: Dow Corning Corporation
    Inventor: Kenneth Michael Lee
  • Patent number: 5665823
    Abstract: The present invention relates to a method for preparing an acrylic-functional polyisobutylene polymer or copolymer, said method comprising reacting a polyisobutylene polymer or copolymer which contains at least one carbon-bonded silanol group in its molecule with a silane having both an acrylic-containing group and a silicon-bonded hydrolyzable group in its molecule.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: September 9, 1997
    Assignee: Dow Corning Corporation
    Inventors: Anil Kumar Saxena, Toshio Suzuki
  • Patent number: 5662832
    Abstract: A composition is disclosed, said composition comprising(A) a polydimethylsiloxane having a viscosity greater than about 2 cS at 25.degree. C.; and(B) a polyisobutylene oligomer having a number average molecular weight of about 200 to about 2,300 and having at least one end terminated with a 2-methylpropenyl group.
    Type: Grant
    Filed: October 4, 1994
    Date of Patent: September 2, 1997
    Assignee: Dow Corning Corporation
    Inventors: Dale Earl Hauenstein, Thomas Matthew Gentle, Linda Denise Kennan, Paul Joseph Popa
  • Patent number: 5661202
    Abstract: There is disclosed a heat-resistant agent which exhibits good solubility in various organopolysiloxanes and which confers superior heat-resistance thereto, said heat-resistant agent having the formula ##STR1## wherein R.sup.2 is independently selected from hydrocarbon or halogenated hydrocarbon groups having 1 to 10 carbon atoms, R.sup.1 is independently selected from R.sup.2 or a eugenol residue, m is an integer having an average value of 5 to 500 and n is an integer having an average value of 0 to 500, with the proviso that there is at least one eugenol residue in the molecule. Also disclosed is a composition comprising an organopolysiloxane and the above described heat-resistant agent.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: August 26, 1997
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Shoji Akamatsu, Haruhiko Furukawa, Toshinori Watanabe
  • Patent number: 5660690
    Abstract: The invention relates to an improved distillation method wherein hexamethylcyclotrisiloxane is isolated from a crude blend thereof by mixing the crude blend with a hydrocarbon co-solvent having a normal boiling point of 125.degree. C. to 150.degree. C. and distilling the resulting mixture in an apparatus having a reboiler, a fractionating column and a condenser, whereby deposition of solid hexamethylcyclotrisiloxane in the condenser is eliminated.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: August 26, 1997
    Assignee: Dow Corning Corporation
    Inventors: Gerald Alphonse Gornowicz, Rocco Joseph Voci
  • Patent number: 5654366
    Abstract: There is disclosed a thermoplastic resin composition wherein the dispersion of a polyorganosiloxane in a thermoplastic resin is improved by the inclusion of a copolymer of an organosiloxane compound and an ester of a vinylcarboxylic acid or a copolymer of an aromatic vinyl compound, an unsaturated aliphatic nitrile compound and an organosiloxane compound. As a consequence of the excellent dispersion, the composition has improved moldability compared with conventional thermoplastic resins containing only polyorganosiloxane and yields moldings that have a releasability, lubricity, water repellency and mechanical strength superior to moldings from the conventional thermoplastic resins containing only polyorganosiloxane.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: August 5, 1997
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Haruhiko Furukawa, Yoshitsugu Morita, Akihiro Nakamura, Hiroshi Ueki
  • Patent number: 5646215
    Abstract: The invention relates to a functionalized polybutylene polymer which contains at least one unsaturated group in its molecule, said functionalized polybutylene being prepared by reacting (A) an anhydride-functional polybutylene with (B) an allyl-functional compound having at least one hydroxyl-containing group in its molecule.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: July 8, 1997
    Assignee: Dow Corning Corporation
    Inventor: Kenneth Michael Lee
  • Patent number: 5633335
    Abstract: There is disclosed a novel silicone-grafted, alicyclic epoxy-functional vinyl polymer prepared by copolymerizing(A) 1 to 80 weight % of a silicone macromonomer which bears a vinyl-polymerizable group at one molecular chain terminal;(B) 5 to 90 weight % of a vinyl-polymerizable, alicyclic epoxy-functional monomer; and(C) 0.01 to 94 weight % of a vinyl-polymerizable non-silicone monomer that is free of alicyclic epoxy functionality.The alicyclic epoxy functionality imparts improved reactivity and the grafted polymer according to the invention provides cured films which exhibit good release and water-repellency.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: May 27, 1997
    Assignee: Dow Corning Toray Silicone Co., Ltd.
    Inventors: Ryuko Manzouji, Tadashi Okawa