Material Contains A Heavy Metal Atom Patents (Class 528/19)
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Patent number: 5994456Abstract: A composition comprising (A) at least one mercapto-functional organosilicon compound having an average of a least two mercapto groups per molecule and (B) a cure initiator. The mercapto-functional organosilicon compound may include mercapto-functional organosilanes, mercapto-functional organosiloxanes, and mercapto-functional copolymers. The compositions of the present invention polymerize or cure to form compositions comprising reaction products of components (A) and (B). The cure initiator is a metal salt that produces a uniform cure throughout the composition, regardless of the amount of oxygen present. The cured products range in properties from soft gels to though elastomers to hard resins and are useful as molded articles, electrical encapsulants, and sealants.Type: GrantFiled: April 9, 1998Date of Patent: November 30, 1999Assignee: Dow Corning CorporationInventors: Jerome Melvin Klosowski, Sarah Severson Snow
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Patent number: 5990024Abstract: Novel methods for the preparation of polymers useful as precursors to ceramic materials by catalytic activation of Si--H bonds are disclosed. The methods comprise reacting, in the presence of a catalyst effective to activate Si--H bonds, Si--N bonds, or both, and/or a reactive solvent, a polymer in the form of a polysilane, polysilazane, polysiloxane or polycarbosilane with a reactant having the structural formula R--X--H, wherein X is NR' or O, R is H, organic, silyl, siloxyl, silazanyl or carbosilyl and may contain at least one additional X--H group, and R' is H, amino, silyl or silazanyl, to produce a modified polymer containing at least one Si--X bond. Polymers produced by these methods are also disclosed.Type: GrantFiled: June 16, 1997Date of Patent: November 23, 1999Assignee: SRI InternationalInventors: Yigal Blum, Gregory A. McDermott
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Patent number: 5985991Abstract: The invention relates to a RTV silicone composition having increased hot oil resistance upon curing. The RTV silicone composition comprises a polydiorganosiloxane, an acyloxy-functional crosslinker, a metal salt of a carboxylic acid catalyst, a filler, and a metal acetate. In a preferred embodiment a metal acetylacetonate is also added.Type: GrantFiled: June 10, 1997Date of Patent: November 16, 1999Assignee: Dow Corning CorporationInventors: Philip David Beljanski, Peter James Houck, Loren Dale Lower
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Patent number: 5969075Abstract: A room temperature curable organopolysiloxane composition comprising (A) an organopolysiloxane having at least two hydroxyl groups, (B) finely divided silica, (C) an amino-bearing silane, (D) an organic silicon compound, and (E) a curing catalyst is prepared by mixing components (A) and (B) with component (C) and thereafter, mixing components (D) and (E).Type: GrantFiled: July 13, 1998Date of Patent: October 19, 1999Assignees: Shin-Etsu Silicones of America, Shin-Etsu Chemical Co., Ltd.Inventor: Yoshifumi Inoue
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Patent number: 5962067Abstract: The invention provides a method for coating an article with a siloxane-based coating composition that results in a coating with high thermal mechanical stability, the method also allowing commercially acceptable speeds to be employed while inhibiting beading of the coating prior to cure. In one embodiment, an article is coated with a composition containing a first methylsilsequioxane oligomer having an initial viscosity of about 2000 cp or less, a second methylsilsequioxane oligomer having an initial viscosity of about 40,000 to about 90,000 cp, a viscosity-lowering additive of a lower aliphatic ketone, and a catalyst. In another embodiment, the invention provides a method for coating an article with a modified methylsilsequioxane coating suitable for higher temperature applications than an all-methyl coating.Type: GrantFiled: September 9, 1997Date of Patent: October 5, 1999Assignee: Lucent Technologies Inc.Inventors: Jerry Rodolfo Bautista, Edwin Arthur Chandross, Valerie Jeanne Kuck
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Patent number: 5962583Abstract: The invention relates to a RTV silicone composition having increased hot oil resistance upon curing. The RTV silicone composition comprises a polydiorganosiloxane, an acyloxy-functional crosslinker, a metal salt of a carboxylic acid catalyst, a filler, and a metal acetylacetonate. In a preferred embodiment a metal oxide is also added.Type: GrantFiled: June 10, 1997Date of Patent: October 5, 1999Assignee: Dow Corning CorporationInventors: Philip David Beljanski, Loren Dale Lower
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Patent number: 5962713Abstract: The present invention relates to new carbosilane dendrimers comprising Si--O-metal bonds, to a method of preparing them and to their use.Type: GrantFiled: August 6, 1997Date of Patent: October 5, 1999Assignee: Bayer AGInventors: Harald Kraus, Michael Mager
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Patent number: 5962568Abstract: A silicone resin for forming a coating powder has organic substitutents selected from the group consisting of phenyl, methyl, C.sub.2 through C.sub.6 alkyl and mixtures thereof; a viscosity of between about 500 and about 10,000 cps at 150.degree. C.; a condensable hydroxyl content of between about 2.0 and about 4.5 wt %; a glass transition temperature of about 55.degree. C. or above; and about 0.2% or less of organic solvent.Type: GrantFiled: March 31, 1998Date of Patent: October 5, 1999Assignee: Morton International, Inc.Inventors: Owen H. Decker, Charles P. Tarnoski
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Patent number: 5942638Abstract: A synthetic process for the selective preparation of reactive polyhedral oligomeric silsesquioxanes (POSS) as well as polyhedral oligomeric silicate (POS) (spherosilicate) is provided. The method claimed herein employs metal catalyzed metathesis reactions for the selective reaction of .alpha.-olefin containing polyhedral oligomeric silsesquioxanes or silicates with olefinic reagents bearing functionalities useful for grafting reactions, polymerization chemistry and sol-gel processes. The use of metal catalyzed metathesis chemistry to form both linear or network polyhedral silsesquioxane polymers directly from .alpha.-olefin-containing polyhedral oligomeric silsesquioxanes is also described.Type: GrantFiled: January 5, 1998Date of Patent: August 24, 1999Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Joseph D. Lichtenhan, Joseph J. Schwabb, Frank J. Feher, Daravong Soulivong
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Patent number: 5939576Abstract: A synthetic process for the selective preparation of reactive polyhedral oligomeric silsesquioxanes (POSS) as well as polyhedral oligomeric silicate (POS) (spherosilicate) is provided. The inventive process employs the use of metal catalyzed hydrosilylation reactions for the selective reaction of silane containing polyhedral oligomeric silsesquioxanes or silicates with olefinic reagents bearing functionalities useful for grafting reactions, polymerization chemistry and sol-gel processes. The invention also discloses metal-catalyzed hydrosulfidation reactions and metal-catalyzed hydrophosphidation reacttions for functionalization of polycyclic silicones.Type: GrantFiled: January 5, 1998Date of Patent: August 17, 1999Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Joseph D. Lichtenhan, Joseph J. Schwab, Frank J. Feher, Daravong Soulivong
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Patent number: 5905130Abstract: Disclosed is a process for the production of a polysilazane containing Si--N linkages in the main chain thereof. According to the present invention, the polysilazane is produced by reacting a polyaminosilane compound with a polyhydrogenated nitrogen-containing compound in the presence of a basic catalyst or by reacting a polyhydrogenated silicon compound with a polyhydrogenated nitrogen-containing compound in the presence of a basic solid oxide catalyst.Type: GrantFiled: August 25, 1997Date of Patent: May 18, 1999Assignee: Tonen CorporationInventors: Hirohiko Nakahara, Osamu Funayama, Takeshi Isoda
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Patent number: 5880227Abstract: A moisture-curable silicone composition is prepared from (A) an organopolysiloxane resin having hydrolyzable groups associated therewith, (B) a fluorosilicone resin having residual silanol groups associated therewith, (C) a hydrolyzable organosilane and (D) a cure accelerating catalyst. The cured composition of the invention in prepared by reacting the aforementioned components (A) through (D) in the presence of moisture and results in a material exhibiting superior oil- and water-repellent properties.Type: GrantFiled: July 25, 1996Date of Patent: March 9, 1999Assignee: Dow Corning Toray Silicone Co., Ltd.Inventors: Hideki Kobayashi, Toru Masatomi
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Patent number: 5880305Abstract: The present invention relates to a process for the preparation of SiOH-functional carbosilane dendrimers.Type: GrantFiled: March 12, 1998Date of Patent: March 9, 1999Assignee: Bayer AGInventors: Harald Kraus, Markus Mechtel
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Patent number: 5877232Abstract: The invention relates to a self-curing, photochemically or thermally curable resinous dental composition based on polymerisable polysiloxanes, to a process for its preparation and to its use for the preparation of pasty, self-curing, photochemically or thermally curable dental materials. Said composition is obtainable by hydrolytic condensation of one or more hydrolytically condensable silicon compounds, 1 to 100 mol %, based on monomeric compounds, of silanes of the general formula: Y.sub.n- SiX.sub.m R.sub.4-(n+m) and/or {X.sub.n R.sub.k Si?R.sup.2 (A).sub.l !.sub.4-(n+k) }.sub.x B being selected. The radicals A, X, Y, R.sup.2, R' and R are identical or different and have the following meaning: A=O, S, PR', POR', NHC(O)O or NHC(O)ONR', B=a straight-chain or branched organic radical which is derived from a compound B' having at least one (for l=1 and A=NHC(O)O or NHC(O)NR') or at least two C.dbd.C double bonds and 5 to 50 carbon atoms, R=alkyl, alkenyl, aryl, alkylaryl or arylalkyl, R'=H, alkyl or aryl, R.Type: GrantFiled: September 13, 1996Date of Patent: March 2, 1999Assignee: The Procter & Gamble CompanyInventors: Werner Storch, Herbert Wolter
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Patent number: 5861468Abstract: A curable polysiloxane of formulaA.sub.a B.sub.b (R.sub.3 SiO.sub.0.5).sub.c (R.sub.2 SiO).sub.d (RSiO.sub.1.5).sub.e (SiO.sub.2).sub.fwhere A and B are silacyclobutane, disilacyclobutane or benzosilacyclobutene functional groups. A composition of matter comprising this polysiloxane and a copper, silver or gold containing catalyst. A method of curing this polysiloxane.Type: GrantFiled: December 1, 1995Date of Patent: January 19, 1999Assignee: Dow Corning Asia, Ltd.Inventors: Brian Robert Harkness, Mamoru Tachikawa, Kasumi Takeuchi
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Patent number: 5808126Abstract: A method for preparing an .alpha.,.omega.-silyl terminated branched polyalkenylenes and polyolefins is provided. The method involves:(I) reacting a mixture comprising(A) at least one branched acyclic diene, and(B) at least one alkenylsilane in the presence of an acid free metathesis catalyst system to produce an .alpha.,.omega.-silyl terminated branched polyalkenylene; or(I) reacting a mixture of(A) at least one cycloolefin, and(B) at least one alkenylsilane in the presence of an acid free metathesis catalyst system to produce an .alpha.,.omega.-silyl terminated branched polyalkenylene. The .alpha.,.omega.-silyl terminated branched polyalkenylene produced by these methods may be hydrogenated to produce an .alpha.,.omega.-silyl terminated branched polyolefin.Type: GrantFiled: September 3, 1997Date of Patent: September 15, 1998Assignees: Dow Corning Corporation, The University of FloridaInventors: Krystyna Regina Brzezinska, Gary Thomas Burns, Russell Keith King, Kenneth Boone Wagener
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Patent number: 5789516Abstract: A method of manufacturing block copolymers containing a polyorganosiloxane segment, by dual polymerization involving (i) polycondensation of a silicone block followed by (ii) the free radical polymerization of a monomer that can be polymerized by free radical polymerization, such as a vinyl containing organic monomer. Initiation of free radical polymerization in step (ii) is carried out with a carbonyl functional group attached to the silicone polymer block. The carbonyl functional silicone polymer, preferably an aldehyde functional silicone polymer, is included as one component of a copper-based Redox initiating system. The method ensures no free homopolymerization, complete reactivity, and various polymer architectures are possible, including for example, polymeric structures such as AB, ABA, (AB).sub.n, brush, and radiant types. The method is fast, effective, convenient, and easier to control than typical ionic polymerization techniques.Type: GrantFiled: April 7, 1997Date of Patent: August 4, 1998Assignee: Dow Corning CorporationInventors: Daniel Graiver, Aaron Quoc Khieu, Binh Thanh Nguyen
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Patent number: 5767216Abstract: The present invention relates to the synthesis of optionally alkoxylated polyorganosiloxane (POS) resins by non-hydrolytic condensation. The object is to provide a process which offers the possibility of controlling the crosslinking. This object, inter alia, is achieved by the process according to the invention, which makes provision for carrying out a non-hydrolytic condensation reaction between alkoxysilyl units (Mo1) and halogenosilyl units (Mo2), both of which are carried by identical or different silanes, in the presence of a catalyst of the Lewis acid type, said condensation reaction generating essentially .tbd.Si--O--Si.tbd. linkages and coproducts XR (X=halogen).Type: GrantFiled: January 31, 1996Date of Patent: June 16, 1998Assignee: Rhone-Poulenc ChimieInventors: Jean-Marc Frances, Hubert Pierre Mutin, Laurence Bourget, Dominique LeClercq, Andre Vioux
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Patent number: 5747608Abstract: Novel rubber-modified rigid silicone resins are disclosed. The novel resins are the copolymerized reaction product of (A) an organosilicon composition selected from the group consisting (I) an organosilicone resin, (II) hydrolyzable precursors of (I), and an hydrolyzate of (II) and (B) an silicone rubber. The novel rubber-modified rigid silicone resins of the invention show remarkably high fracture toughness, K.sub.Ic, and critical strain energy release rate G.sub.Ic.Type: GrantFiled: December 31, 1996Date of Patent: May 5, 1998Assignees: Dow Corning Corporation, Massachusetts Inst. Tech.Inventors: Dimitris Elias Katsoulis, John Robert Keryk, Frederick Jerome McGarry, Randall Gene Schmidt, Ramnath Subramanian, Harold Lewis Vincent, Bizhong Zhu
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Patent number: 5739246Abstract: Polysiloxanes having pendant and/or telechelic carbonyl functionality, i.e., aldehyde functionality .tbd.Si--R--CH.dbd.O or ketone functionality .tbd.Si--R--CR.dbd.O, are manufactured in high yield by ozonolysis of polydiorganosiloxanes containing alkenyl groups, followed by treatment with a reducing agent such as zinc and acetic acid. The process is relatively fast and economical using readily available starting materials such as hexenyl-functional polymers. In particular, aldehyde functionality on the polymer can be used as a polymeric crosslinking agent.Type: GrantFiled: March 6, 1997Date of Patent: April 14, 1998Assignee: Dow Corning CorporationInventors: Daniel Graiver, Aaron Quoc Khieu, Binh Thanh Nguyen
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Patent number: 5734001Abstract: A novel fluorosilicone compound having at least two hydroxyl groups in its molecule and a curable composition containing such a compound and a commercially available general purpose curing agent; the compound is used suitably for a lubricant and a fiber treating agent, and the curable composition is used suitably for a mold releasing agent, a water- and oil-repelling agent, a stain-proof coating agent, a non-tackifying coating agent, a coating agent for optical use and a sealant.Type: GrantFiled: November 20, 1996Date of Patent: March 31, 1998Assignee: Daikin Industries, Ltd.Inventors: Fumihiko Yamaguchi, Tatsuya Otsuka, Masayuki Yamana, Masato Kashiwagi, Hirotoshi Sakashita
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Patent number: 5733995Abstract: A organopolysiloxane composition suited to automobile oil seals is provided, which includes (A) a diorganopolysiloxane having a viscosity at 25.degree. C. of 25 to 1,000,000 cSt blocked with a hydroxyl group at both ends of its molecular chain; (B) an iminoxysilane having the formula (1):(R.sup.1).sub.4-n Si?--O--N.dbd.C(R.sup.1).sub.2 !.sub.n (1)wherein R.sup.1 are an unsubstituted or substituted monovalent saturated hydrocarbon group, and n is 3 or 4; (C) an amino group-containing hydrolyzable silane having the formula (2):H.sub.2 N--R.sup.2 --NH--R.sup.2 --Si(--O--R.sup.3).sub.3 (2)wherein R.sup.2 are an unsubstituted or substituted divalent saturated hydrocarbon group having 1 to 4 carbon atoms, and R.sup.3 are a monovalent saturated hydrocarbon group having 1 to 4 carbon atoms; and (D) a curing catalyst. The composition is able to maintain a low foamability even when dispersed or dissolved in automobile oils, and is cured to provide an automobile oil seal.Type: GrantFiled: October 28, 1996Date of Patent: March 31, 1998Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Tsuneo Kimura, Kazuyuki Suzuki
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Patent number: 5726256Abstract: The instant invention pertains to a method of producing silicone pressure sensitive adhesives wherein the method comprises (I) combining together (A) a benzene soluble, hydroxyl containing organopolysiloxane resin consisting essentially of R.sub.3 SiO.sub.1/2 siloxane units and SiO.sub.4/2 siloxane units, wherein R is a monovalent radical selected from the group consisting of hydrocarbon and halogenated hydrocarbon radicals having from 1 to 10 carbon atoms; there being from 0.5 to 1.5 R.sub.3 SiO.sub.1/2 units for every SiO.sub.4/2 units and there being 1.0 to 4 wt %, based on FTIR, hydroxyl functionality and (B) a hydroxyl containing polydiorganosiloxane having a viscosity of .gtoreq.100 mPa's and (C) a catalyst selected from the group consisting of a weak organic acid or metal salt thereof; and thereafter (II) heating the mixture of (A), (B) and (C) for a time sufficient to produce the silicone pressure sensitive adhesive.Type: GrantFiled: October 22, 1996Date of Patent: March 10, 1998Assignee: Dow Corning CorporationInventors: Edward Joseph Benson, Joseph Thomas Braun, Joseph Norbert Clark, Peter Lamont
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Patent number: 5708067Abstract: 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: GrantFiled: December 26, 1996Date of Patent: January 13, 1998Assignee: Dow Corning Toray Silicone Co., Ltd.Inventors: Shoji Akamatsu, Haruhiko Furukawa, Toshinori Watanabe
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Patent number: 5700400Abstract: A method for producing a semiconducting material by subjecting a hydrosilane monomer to dehydrogenative condensation followed by thermal decomposition is disclosed. The hydrosilane monomer may be a hydromonosilane, a hydrodisilane or a hydrotrisilane. The dehydrogenative condensation is conducted in the presence of a catalyst that contains at least one metal or metal compound of Groups 3B, 4B and 8 of the Periodic Table. The catalyst may be used in conjunction with a silane compound or a metal hydride. The semiconducting material that is formed may have a silicon content of 70 atomic % or more.Type: GrantFiled: August 14, 1995Date of Patent: December 23, 1997Assignee: Nippon Oil Co., Ltd.Inventors: Keizo Ikai, Masaki Minami, Mitsuo Matsuno
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Patent number: 5686546Abstract: A cross-linkable polymer composition containing a cross-linkable polymer having at least one hydrolysable silane group and at least one lactone or anhydride silanol condensation catalyst for example, lactide and 2-dodecen-1-yl succinic anhydride. The catalyst is not conducive to causing premature cross-linking. The composition provides a cross-linked polymer having good anti-scorch properties. Compositions containing lactones as the silanol condensation catalyst also provide cross-linked polymers having improved adhesion properties.Type: GrantFiled: November 9, 1995Date of Patent: November 11, 1997Assignee: At Plastics, Inc.Inventor: Alexander Henderson
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Patent number: 5677410Abstract: The present invention relates to novel functional carbosilane-dendrimers, organic-inorganic carbosilane-hybrid materials, methods for manufacturing them, methods for manufacturing coatings from the functional carbosilane-dendrimers and the use thereof.Type: GrantFiled: May 2, 1996Date of Patent: October 14, 1997Assignee: Bayer AGInventors: Michael Mager, Jorg-Dietrich Jentsch, Christoph Schild
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Patent number: 5652302Abstract: The invention is an improvement in a process for producing silicone resins, to produce a silicone resin that has a high dynamic viscosity of at 293.degree. K. of from about 40 to about 300 mPas, a long shelf life, and a siloxane content of from about 50 to about 70 ma %, by the condensation of oligomeric siloxanes in concentrated solutions, by carrying out the condensation by heating at reflux and in the presence of a metal containing catalyst and dicarboxylic acid.Type: GrantFiled: January 30, 1991Date of Patent: July 29, 1997Assignee: Huls Silicone GmbHInventors: Lothar Heinrich, Helga Sadowski, Gunter Beuschel
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Patent number: 5646227Abstract: The present invention is directed to a polyisocyanate mixturei) having an NCO content of 5 to 35% by weight and prepared from an organic diisocyanate,ii) containing up to 25% by weight of isocyanurate groups (calculated as N.sub.3, C.sub.3, O.sub.3, MW 126),iii) containing allophanate groups in an amount such that there are more equivalents of allophanate groups than urethane and urea groups and such that the polyisocyanate mixture remains stable and homogeneous in storage for 3 months at 25.degree. C. andiv) containing siloxane groups (calculated as SiO, MW 44) in an amount of 0.002 to 50% by weight,wherein the preceding percentages are based on the solids content of the polyisocyanate mixture, excluding any unreacted organic diisocyanate, and wherein the siloxane groups are incorporated by reacting an isocyanate group with a compound containing two or more isocyanate-reactive groups directly attached to carbon atoms and one or more siloxane groups.Type: GrantFiled: February 1, 1996Date of Patent: July 8, 1997Assignee: Bayer CorporationInventors: William E. Slack, Edward P. Squiller, Philip E. Yeske
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Patent number: 5639844Abstract: Novel methods for the preparation of polymers useful as precursors to ceramic materials by catalytic activation of Si--H bonds are disclosed. The methods comprise reacting, in the presence of a catalyst effective to activate Si--H bonds, Si--N bonds, or both, and/or a reactive solvent, a polymer in the form of a polysilane, polysilazane, polysiloxane or polycarbosilane with a reactant having the structural formula R--X--H, wherein X is NR' or O, R is H, organic, silyl, siloxyl, silazanyl or carbosilyl and may contain at least one additional X--H group, and R' is H, amino, silyl or silazanyl, to produce a modified polymer containing at least one Si--X bond. Polymers produced by these methods are also disclosed.Type: GrantFiled: October 25, 1995Date of Patent: June 17, 1997Assignee: SRI InternationalInventors: Yigal Blum, Gregory A. McDermott
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Patent number: 5629095Abstract: The present invention relates to radiation curable silicone vinyl ethers and methods for preparing silicone vinyl ethers. More particularly, the present invention relates compositions containing vinyl ether functional silicones and to the preparation and use of silicone vinyl ethers which are curable by addition of photocleavable acids and exposure to ultraviolet or electron beam radiation.Type: GrantFiled: May 18, 1995Date of Patent: May 13, 1997Assignee: Dow Corning CorporationInventors: Valerie J. Bujanowski, Shedric O. Glover, Susan V. Perz, Maris J. Ziemelis, Gary R. Homan, Michael W. Skinner
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Patent number: 5623030Abstract: A curable composition providing a cured product having a silicon type interpenetrating polymer network, which comprises (A) a silsesquioxane ladder polymer, (B) a silicon compound having at least two SiH groups per molecule, (C) a silicon compound having at least two vinylsilyl groups per molecule and (D) a neutral platinum catalyst; and a process for producing a molded article comprising heating the curable composition under a controlled temperature for synchronously causing hydrolysis and condensation of the alkoxysilyl group and/or silanol group and hydrosilylation.Type: GrantFiled: November 29, 1995Date of Patent: April 22, 1997Assignee: Kanegafuchi Kagaku Kogyo Kabushiki KaishaInventors: Manabu Tsumura, Masafumi Hiraishi, Takahisa Iwahara, Toshifumi Hirose
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Patent number: 5616674Abstract: Polycarbonate-polysiloxane block copolymers are prepared by interfacial polymerization technique in the presence or a phase transfer catalyst.Type: GrantFiled: September 20, 1995Date of Patent: April 1, 1997Assignee: General Electric CompanyInventors: Rodney L. Michel, Paul D. Sybert, Gary C. Davis, William J. Swatos
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Patent number: 5608096Abstract: The invention relates to a method of forming siloxane polymers using a heteropoly catalyst having a Keggin structure. The method comprises contacting a fluid comprising at least one siloxane polymer precursor selected from the group consisting of cyclic siloxanes (I) having the formula (RR'SiO).sub.a and linear siloxanes (II) having the formula ##STR1## where R is a substituted or unsubstituted monovalent hydrocarbon having from 1 to 6 carbon atoms, R' is hydrogen or a substituted or unsubstituted monovalent hydrocarbon having from 1 to 6 carbon atoms, a is at least 3 and b is at least 1; with an effective amount of a heteropoly catalyst having a Keggin structure, selected from the group consisting of heteropoly acids (III) having the formula H.sub.n XM.sub.12 O.sub.40, salts thereof and mixed acid-salts thereof, where X is B.sup.+3, Si.sup.+4, Ge .sup.+4, p.sup.+5, M is Mo.sup.+6 and n is 3, 4 or 5, as required for the valence of the heteropoly acid to equal 0, at a temperature ranging from about 23.degree.Type: GrantFiled: December 28, 1995Date of Patent: March 4, 1997Assignee: Dow Corning CorporationInventors: Dimitris E. Katsoulis, John R. Keryk
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Patent number: 5605998Abstract: There is disclosed a method for producing polycarbosilanes, comprising polymerizing silane of the formula SiH.sub.4 with dienes in the presence of a rare earth metal complex. Polycarbosilanes useful as photoreactive materials and as raw material of silicon carbide-series ceramics can be obtained in a high yield from silane (SiH.sub.4) and dienes.Type: GrantFiled: March 9, 1995Date of Patent: February 25, 1997Assignee: Director-General of Agency of Industrial Science and TechnologyInventors: Toshi-aki Kobayashi, Masato Tanaka
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Patent number: 5605999Abstract: An anaerobically curing composition is comprised of (i) a silicone fluid formed as the reaction product of at least one first silane of formula I:R.sub.n Si(X).sub.4-n (I),wherein the R groups are the same or different and selected from the group consisting of hydrogen, C1-C12 alkyl, C6-C12 aryl, C7-C18 arylalkyl, C7-C18 alkylaryl, haloalkyl, haloaryl and monovalent ethylenically unsaturated radicals excluding (meth)acryloxy functional groups, X is a hydrolyzable functionality, and n is an integer of from 0 to 3, and at least one second silane of formula II:R.sup.1.sub.m R.sup.2.sub.p Si(X).sub.4-(m+p) (II),wherein R.sup.1 is a (meth)acrylic functional group and R.sup.Type: GrantFiled: June 5, 1995Date of Patent: February 25, 1997Assignee: Loctite CorporationInventors: Hsien-Kun Chu, Richard D. Rich, I. David Crossan, Robert P. Cross
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Patent number: 5545682Abstract: The introduction of release coating-forming silicone compositions that yield cured release coatings that exhibit excellent release properties against tacky substances and do not impair the residual adhesion of tacky substances.Silicone composition for the formation of cured release coatings, that characteristically comprises(A) 100 weight parts of a cured coating-forming silicone composition into which there is admixed(B) 0.5 to 500 weight parts organosilicon polymer with the following average unit formula ##STR1## wherein R represents C.sub.1 to C.sub.10 monovalent hydrocarbon groups that are free of aliphatic unsaturation; R.sup.1 represents organic groups selected from the group consisting essentially of C.sub.2 to C.sub.20 alkylene groups and organic groups with the formulas --R.sup.3 (OR.sup.3).sub.y -- and --R.sup.3 --(R.sub.2 SiO).sub.z R.sub.2 Si--R.sup.3 -- (R is defined as above, R.sup.3 denotes C.sub.2 to C.sub.Type: GrantFiled: May 23, 1995Date of Patent: August 13, 1996Assignee: Dow Corning Silicone Co., Ltd.Inventors: Nobuo Kaiya, Hideki Kobayashi
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Patent number: 5534588Abstract: A room temperature vulcanizable silicone rubber composition with high elongation and low modulus comprising 10-90 percent by weight polydiorganosiloxane having terminal hydroxyl groups, 1-10 percent by weight phenyl tris-functional ketoximino-containing silane crosslinker, 0-14 percent by weight of a reinforcing or 0-60 percent by weight of a nonreinforcing filler or semi-reinforcing filler or a mixture thereof for a total of all fillers in the range of from about 6-60 percent by weight, from 0-2.5 percent by weight of an organofunctional silane adhesion promoter and an optional plasticizer and catalyst. These compositions cure to elastic materials useful as caulking materials, adhesives, coatings and encapsulating materials for the construction and other industries.Type: GrantFiled: May 18, 1995Date of Patent: July 9, 1996Assignee: AlliedSignal Inc.Inventors: Jeffrey A. Knepper, Dale R. Flackett, Edward T. Asirvatham
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Patent number: 5530090Abstract: Macrocyclic oligomer mixtures, particularly polyimide oligomer mixtures, are prepared by the treatment of a dihalo-substituted organic compound or the like under reducing conditions, preferably by a complex of a zerovalent Group VIII metal. Cyclization takes place by reductive dehalogenation.Type: GrantFiled: April 10, 1995Date of Patent: June 25, 1996Assignee: General Electric CompanyInventor: Farid F. Khouri
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Patent number: 5525427Abstract: A water reducible weatherstrip coating comprising a two or three component system comprising a silicone emulsion base, a bath-life extender, and a crosslinking composition.Type: GrantFiled: March 8, 1995Date of Patent: June 11, 1996Assignee: General Electric CompanyInventors: Roy M. Griswold, Shaow B. Lin
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Patent number: 5500300Abstract: Photocurable silicone compositions are provided which utilize an epoxy functional silicone fluid having chloroalkyl radicals attached to silicon by carbon-silicon bonds. Cure of the epoxy functional silicone fluid is achieved with a photodecomposable diaryliodonium hexafluoro(Group VA.) salt such as diphenyliodoniumhexafluoroantimonate. The photocurable silicone compositions can be applied and photocured on to various substrates, such as a thermoplastic substrate as a release coating.Type: GrantFiled: May 18, 1995Date of Patent: March 19, 1996Assignee: General Electric CompanyInventor: Richard P. Eckberg
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Patent number: 5492992Abstract: A process for making liquid polymers by condensing monomers and/or oligomers, mixing them with a catalyst where required, and dispersing the mixture via an atomizing device to form small droplets suspended in a reaction chamber. The reagents are caused to polymerize in the dispersed state. The process is preferably carried out in a spray dryer using an atomizing device and is particularly useful for polymerizing organosilicon compounds by condensation.Type: GrantFiled: December 5, 1994Date of Patent: February 20, 1996Assignee: Dow Corning S.A.Inventor: Jean M. Gilson
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Patent number: 5468825Abstract: A coating composition for carriers which are adapted for use in electrophotography is described. The composition comprises an organopolysiloxane of the following average unit formula (1)R.sup.1.sub.a Si(OR.sup.2).sub.b O.sub.[4-(a+b)]/2 (1)wherein R.sup.1 represents an alkyl group having from 1 to 10 carbon atoms or a phenyl group, R.sup.2 represents a hydrogen atom or an alkyl, alkenyl or alkoxyalkyl group, each having from 1 to 10 carbon atoms for the alkyl and alkenyl and from 2 to 10 carbon atoms for the alkoxyalkyl, a is a value of 0.8.ltoreq.a.ltoreq.1.8, b is a value of 0<b<3, an organosilane of the following general formula (2) serving as a crosslinking agent for the organopolysiloxane(CH.sub.3).sub.2 SiX.sub.2 (2)wherein each X represents an alkenoxy group or oxime having from 2 to 10 carbon atoms, and a curing catalyst for the organopolysiloxane. Carriers having core particles and a cured film of the composition formed on individual particles are also described.Type: GrantFiled: January 24, 1994Date of Patent: November 21, 1995Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Mitsuhiro Takarada, Yuji Yoshikawa, Kenji Yamamoto
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Patent number: 5457220Abstract: The present invention relates to a new silicone cure system. More particularly, the present invention discloses that a siloxane system containing sufficiently high levels of T or Q species in addition to M, D and a limited amount of silanol species can be cured by linear phosphonitrilic chloride disproportionation catalyst.Type: GrantFiled: April 29, 1994Date of Patent: October 10, 1995Assignee: General Electric CompanyInventor: John S. Razzano
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Patent number: 5446115Abstract: A curable composition suitable for treating substrates in order to render them oil repellent, water repellent and stain resistant, said composition comprising:(A) a fluorine-containing organosilicon compound having the general formula ##STR1## wherein R.sup.1 denotes a monovalent hydrocarbon group, excluding alkenyl groups, R.sup.2 denotes a divalent organic group, a is 2 or 3, and m is an integer having a value of 4 to 12, or a partial hydrolysis and condensation product thereof, and(B) a catalytic quantity of a condensation-reaction catalyst.Type: GrantFiled: August 9, 1994Date of Patent: August 29, 1995Assignee: Dow Corning Toray Silicon Co., Ltd.Inventor: Hideki Kobayashi
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Patent number: 5438114Abstract: Macrocyclic polyimide oligomers are converted to linear polyimides by heating with a primary amine in the presence of a tertiary amine, tertiary phosphine, quaternary ammonium salt, quaternary phosphonium salt or hexaalkylguanidinium salt or heterocyclic analog thereof as a macrocyclic polyimide polymerization catalyst.Type: GrantFiled: June 17, 1994Date of Patent: August 1, 1995Assignee: General Electric CompanyInventors: Dwain M. White, Jane M. Terry
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Patent number: 5432007Abstract: A solvent-free ternary organosiloxane composition is disclosed, which contains (A) liquid organopolysiloxane, (B) a cross-linking agent, and (C) a curing catalyst and, optionally, (D) a filler, said organopolysiloxane (A) being constituted by organosilicon group of X--Si (wherein X represents a hydrogen atom or a monovalent hydrocarbyl group) and functional side chain of OR (wherein R represents a hydrogen atom, a C.sub.1 -C.sub.Type: GrantFiled: October 5, 1993Date of Patent: July 11, 1995Assignee: Shizu NAITOInventor: Hiroyuki Naito
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Patent number: 5412055Abstract: Disclosed are organosilicon crosslinked polymers and crosslinkable prepolymers that are the reaction product of (a) a cyclic polysiloxane in which each silicon atom is substituted with (i) a saturated, substituted or unsubstituted alkyl or alkoxy group or a substituded or unsubstituted aryl or aryloxy group, and (ii) a substituted or unsubstituted hydrocarbon group having at least one carbon-carbon double bond that is reactive in hydrosilation, (b) at least one organosilicon compound having at least two .tbd.SiH groups, and optionally (c) a hydrocarbon polyene having at least two nonaromatic carbon-carbon double bonds that are reactive in hydrosilation. A process for preparing the polymers and prepolymers and for preparing the cyclic polysiloxanes is also disclosed.Type: GrantFiled: April 18, 1994Date of Patent: May 2, 1995Assignee: Hercules IncoporatedInventor: De-Kai Loo
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Patent number: 5395697Abstract: A coating composition comprises an epoxy silane, an amine hardener that can react with the epoxy silane to form a cross-linked coating, and a stabilizer that includes a sufficient amount of a metal component to delay cross-linking between the epoxy silane and the amine hardener. The coating composition has a shelf life of at least 3 days.Type: GrantFiled: March 11, 1994Date of Patent: March 7, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventor: Eric D. Morrison
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Patent number: 5387480Abstract: Disclosed is a method of forming high dielectric constant coatings on substrates. The method comprises applying a coating of hydrogen silsesquioxane resin and a high dielectric constant filler onto a substrate and heating the coated substrate at a temperature sufficient to convert the hydrogen silsesquioxane resin to a silica containing ceramic matrix containing the filler.Type: GrantFiled: August 9, 1993Date of Patent: February 7, 1995Assignee: Dow Corning CorporationInventors: Loren A. Haluska, Keith W. Michael