Patents by Inventor Aswini K. Dash
Aswini K. Dash has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230074905Abstract: A curable polysiloxane release coating composition comprises (A) an organopolysiloxane containing ethylenically unsaturated groups. Component (A) is selected from: (A1) a branched organopolysiloxane containing at least three (3) organopolysiloxane branch chains linked through a central core including at least two (2) organopolysiloxane branch chains each of which contain an ethylenically unsaturated group; and/or (A2) a linear organopolysiloxane containing at least 2 ethylenically unsaturated groups having at least six (6) carbon atoms. The composition further comprises (B) an organopolysiloxane containing at least 2 Si—H groups, and (C) a hydrosilylation catalyst.Type: ApplicationFiled: August 22, 2022Publication date: March 9, 2023Inventors: Aswini K. Dash, Zhenbin Niu, David A. Rich
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Publication number: 20220389274Abstract: A release coating composition comprises (A) an organopolysiloxane containing at least two (2) ethylenically unsaturated groups, (B) an organopolysiloxane containing at least 2 Si—H groups per molecule, and (C) a hydrosilylation catalyst. If the organopolysiloxane (A) contains only 2 ethylenically unsaturated groups, the organopolysiloxane (B) contains on average more than 2 Si—H groups per molecule. The composition further comprises (D1) a hydrosilylation inhibitor comprising a maleimide of the general formula (I): In formula (I), A3 represents a hydrogen atom or a hydrocarbyl or substituted hydrocarbyl group having 1 to 18 carbon atoms, and A1 and A2 each represent a hydrogen atom or a hydrocarbyl or substituted hydrocarbyl group having 1 to 18 carbon atoms.Type: ApplicationFiled: August 19, 2022Publication date: December 8, 2022Inventors: Aswini K. DASH, Zhenbin NIU, David A. RICH
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Patent number: 11453805Abstract: A curable polysiloxane release coating composition comprises (A) an organopolysiloxane containing at least two (2) ethylenically unsaturated groups, (B) an organopolysiloxane containing at least 2 Si—H groups per molecule, and (C) a hydrosilylation catalyst. If the organopolysiloxane (A) contains only 2 ethylenically unsaturated groups, the organopolysiloxane (B) contains on average more than 2 Si—H groups per molecule. The composition further comprises (D1) a hydrosilylation inhibitor comprising a maleimide of the general formula (I). In formula (I), A3? represents a hydrogen atom or a hydrocarbyl or substituted hydrocarbyl group having 1 to 18 carbon atoms, and A1? and A2? each represent a hydrogen atom or a hydrocarbyl or substituted hydrocarbyl group having 1 to 18 carbon atoms.Type: GrantFiled: March 16, 2018Date of Patent: September 27, 2022Assignee: DOW SILICONES CORPORATIONInventors: Aswini K. Dash, Zhenbin Niu, David A. Rich
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Patent number: 10946368Abstract: A catalyst having a specific structure and a method of preparing the catalyst is disclosed. A composition is also disclosed, which comprises: (A) an unsaturated compound including at least one aliphatically unsaturated group per molecule, subject to at least one of the following two provisos: (1) the (A) unsaturated compound also includes at least one silicon-bonded hydrogen atom per molecule; and/or (2) the composition further comprises (B) a silicon hydride compound including at least one silicon-bonded hydrogen atom per molecule. The composition further comprises (C) the catalyst. A method of preparing a hydrosilylation reaction product and a dehydrogenative silylation reaction product are also disclosed.Type: GrantFiled: July 17, 2018Date of Patent: March 16, 2021Assignees: DOW SILICONES CORPORATION, BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISInventors: Debashis Basu, Aswini K. Dash, Thomas B. Rauchfuss, Ryan Gilbert Watson
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Publication number: 20200325371Abstract: A curable polysiloxane release coating composition comprises (A) an organopolysiloxane containing ethylenically unsaturated groups. Component (A) is selected from: (A1) a branched organopolysiloxane containing at least three (3) organopolysiloxane branch chains linked through a central core including at least two (2) organopolysiloxane branch chains each of which contain an ethylenically unsaturated group; and/or (A2) a linear organopolysiloxane containing at least 2 ethylenically unsaturated groups having at least six (6) carbon atoms. The composition further comprises (B) an organopolysiloxane containing at least 2 Si—H groups, and (C) a hydrosilylation catalyst. The composition yet further comprises (D) a hydrosilylation inhibitor comprising a maleimide of the general formula (I).Type: ApplicationFiled: March 16, 2018Publication date: October 15, 2020Inventors: Aswini K. DASH, Zhenbin NIU, David A. RICH
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Publication number: 20200230585Abstract: A catalyst having a specific structure and a method of preparing the catalyst is disclosed. A composition is also disclosed, which comprises: (A) an unsaturated compound including at least one aliphatically unsaturated group per molecule, subject to at least one of the following two provisos: (1) the (A) unsaturated compound also includes at least one silicon-bonded hydrogen atom per molecule; and/or (2) the composition further comprises (B) a silicon hydride compound including at least one silicon-bonded hydrogen atom per molecule. The composition further comprises (C) the catalyst. A method of preparing a hydrosilylation reaction product and a dehydrogenative silylation reaction product are also disclosed.Type: ApplicationFiled: July 7, 2018Publication date: July 23, 2020Inventors: Debashis BASU, Aswini K. DASH, Thomas B. RAUCHFUSS, Ryan Gilbert WATSON
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Publication number: 20200181183Abstract: A platinum organosiloxane complex is prepared by a process including 1) combining A) a platinous halide and B) a ketone, and thereafter 2) adding C) a polyorganosiloxane having, per molecule, 2 to 4 silicon bonded terminally unsaturated hydrocarbon groups having from 2 to 6 carbon. The platinum organosiloxane complex prepared by the process is useful as a hydrosilylation catalyst.Type: ApplicationFiled: July 18, 2018Publication date: June 11, 2020Inventors: Aswini K Dash, Zhanjie Li, Andrew Millward, Ming-Shin Tzou
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Publication number: 20200010734Abstract: A curable polysiloxane release coating composition comprises (A) an organopolysiloxane containing at least two (2) ethylenically unsaturated groups, (B) an organopolysiloxane containing at least 2 Si—H groups per molecule, and (C) a hydrosilylation catalyst. If the organopolysiloxane (A) contains only 2 ethylenically unsaturated groups, the organopolysiloxane (B) contains on average more than 2 Si—H groups per molecule. The composition further comprises (D1) a hydrosilylation inhibitor comprising a maleimide of the general formula (I). In formula (I), A3? represents a hydrogen atom or a hydrocarbyl or substituted hydrocarbyl group having 1 to 18 carbon atoms, and A1? and A2? each represent a hydrogen atom or a hydrocarbyl or substituted hydrocarbyl group having 1 to 18 carbon atoms.Type: ApplicationFiled: March 16, 2018Publication date: January 9, 2020Inventors: Aswini K. DASH, Zhenbin NIU, David A. RICH
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Patent number: 9422316Abstract: A method comprises separate and consecutive steps (i) and (ii). Step (i) includes contacting a copper catalyst with hydrogen gas and a halogenated silane monomer at a temperature of 500° C. to 1400° C. to form a silicon-containing copper catalyst comprising at least 0.1% (w/w) of silicon. Step (ii) includes contacting the silicon-containing copper catalyst with an organohalide at a temperature of 100° C. to 600° C. to form a reaction product. The organohalide has formula HaCbXc, where X is a halogen atom, subscript a is an integer of 0 or more, subscript b is an integer of 1 or more, and subscript c is an integer of 2 or more. The method produces a reaction product. The reaction product includes a halogenated silahydrocarbylene.Type: GrantFiled: July 2, 2013Date of Patent: August 23, 2016Assignee: DOW CORNING CORPORATIONInventors: Aswini K. Dash, Dimitris Elias Katsoulis, Matthew J. McLaughlin, Wendy Sparschu
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Publication number: 20150232488Abstract: A method comprises separate and consecutive steps (i) and (ii). Step (i) includes contacting a copper catalyst with hydrogen gas and a halogenated silane monomer at a temperature of 500° C. to 1400° C. to form a silicon-containing copper catalyst comprising at least 0.1% (w/w) of silicon. Step (ii) includes contacting the silicon-containing copper catalyst with an organohalide at a temperature of 100° C. to 600° C. to form a reaction product. The organohalide has formula HaCbXc, where X is a halogen atom, subscript a is an integer of 0 or more, subscript b is an integer of 1 or more, and subscript c is an integer of 2 or more. The method produces a reaction product. The reaction product includes a halogenated silahydrocarbylene.Type: ApplicationFiled: July 2, 2013Publication date: August 20, 2015Applicant: Dow Corning CorporationInventors: Aswini K. Dash, Dimitris Elias Katsoulis, Matthew J. McLaughlin, Wendy Sparschu
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Patent number: 9073951Abstract: A method of preparing organohalosilanes comprising combining an organohalide having the formula RX (I), wherein R is a hydrocarbyl group having 1 to 10 carbon atoms and X is fluoro, chloro, bromo, or iodo, with a contact mass comprising at least 2% (w/w) of a palladium suicide of the formula PdxSiy (II), wherein x is an integer from 1 to 5 and y is 1 to 8, or a platinum suicide of formula PtzSi (III), wherein z is 1 or 2, in a reactor at a temperature from 250 to 700° C. to form an organohalosilane.Type: GrantFiled: January 24, 2011Date of Patent: July 7, 2015Assignee: Dow Corning CorporationInventors: Kurt E. Anderson, Aswini K. Dash, Charles Alan Hall, Dimitris Katsoulis, Robert Thomas Larsen, Matthew J. McLaughlin, Jonathan David Wineland
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Patent number: 8722915Abstract: A process for preparing organohalosilanes comprising combining hydrogen, a halosilane having the formula HaSiX4-a (I) and an organohalide having the formula RX (II), wherein R is C1-C10 alkyl or C4-C10 cycloalkyl, each X is independently halo, and the subscript a is 0, 1, or 2, in the presence of a sufficient amount of a catalyst effective in enabling the replacement of one or more of the halo groups of the halosilane with the R group from the organohalide, at a temperature from 200 to 800° C., to form an organohalosilane and a hydrogen halide, wherein the volumetric ratio of hydrogen to halosilane is from 1:3 to 1:0.001 and the volumetric ratio of hydrogen to organohalide is from 1:1 to 1:0.001, and wherein the catalyst is optionally treated with the hydrogen or the halosilane prior to the combining.Type: GrantFiled: April 6, 2011Date of Patent: May 13, 2014Assignee: Dow Corning CorporationInventors: Aswini K. Dash, Charles Alan Hall, Dimitris Katsoulis, Robert Thomas Larsen, Matthew J. McLaughlin, Jonathan David Wineland
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Publication number: 20130060060Abstract: A process for preparing organohalosilanes comprising combining hydrogen, a halosilane having the formula HaSiX4-a (I) and an organohalide having the formula RX (II), wherein R is C1-C10 alkyl or C4-C10 cycloalkyl, each X is independently halo, and the subscript a is 0, 1, or 2, in the presence of a sufficient amount of a catalyst effective in enabling the replacement of one or more of the halo groups of the halosilane with the R group from the organohalide, at a temperature from 200 to 800° C., to form an organohalosilane and a hydrogen halide, wherein the volumetric ratio of hydrogen to halosilane is from 1:3 to 1:0.001 and the volumetric ratio of hydrogen to organohalide is from 1:1 to 1:0.001, and wherein the catalyst is optionally treated with the hydrogen or the halosilane prior to the combining.Type: ApplicationFiled: April 6, 2011Publication date: March 7, 2013Inventors: Aswini K. Dash, Charles Alan Hall, Dimitris Katsoulis, Robert Thomas Larsen, Matthew J. McLaughlin, Jonathan David Wineland
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Publication number: 20120289730Abstract: A method of preparing organohalosilanes comprising combining an organohalide having the formula RX (I), wherein R is a hydrocarbyl group having 1 to 10 carbon atoms and X is fluoro, chloro, bromo, or iodo, with a contact mass comprising at least 2% (w/w) of a palladium suicide of the formula PdxSiy (II), wherein x is an integer from 1 to 5 and y is 1 to 8, or a platinum suicide of formula Pt2Si (III), wherein z is 1 or 2, in a reactor at a temperature from 250 to 700° C. to form an organohalosilane.Type: ApplicationFiled: January 24, 2011Publication date: November 15, 2012Inventors: Kurt E. Anderson, Aswini K. Dash, Charles Alan Hall, Dimitris Katsoulis, Robert Thomas Larsen, Matthew J. Mclaughlin, Jonathan David Wineland