Patents by Inventor Yasufumi Kubota
Yasufumi Kubota 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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Patent number: 11203603Abstract: Provided is a carbonate-containing silane compound having a characteristic structure that at least two silicon atoms are linked by a carbon chain. The silane compound is chemically stable. When used as an additive to a nonaqueous electrolyte solution, the silane compound does not jeopardize the safety of lithium ion secondary batteries.Type: GrantFiled: May 29, 2019Date of Patent: December 21, 2021Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Shotaro Aoki, Yoichi Tonomura, Yasufumi Kubota, Ayumu Kiyomori
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Publication number: 20190367539Abstract: Provided is a carbonate-containing silane compound having a characteristic structure that at least two silicon atoms are linked by a carbon chain. The silane compound is chemically stable. When used as an additive to a nonaqueous electrolyte solution, the silane compound does not jeopardize the safety of lithium ion secondary batteries.Type: ApplicationFiled: May 29, 2019Publication date: December 5, 2019Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Shotaro Aoki, Yoichi Tonomura, Yasufumi Kubota, Ayumu Kiyomori
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Patent number: 9139603Abstract: A [3-(2-norbornyl)-2-norbornyl]silane compound having formula (1) is novel, wherein R1 is a monovalent hydrocarbon radical, X is halogen or an organoxy OR2, R2 is a monovalent hydrocarbon radical, n is 1 or 2 when X is halogen, and n is 0, 1 or 2 when X is organoxy. It is a useful reactant for forming surface coatings on electronic parts.Type: GrantFiled: October 24, 2013Date of Patent: September 22, 2015Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Yasufumi Kubota, Tohru Kubota
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Publication number: 20140121398Abstract: A [3-(2-norbornyl)-2-norbornyl]silane compound having formula (1) is novel, wherein R1 is a monovalent hydrocarbon radical, X is halogen or an organoxy OR2, R2 is a monovalent hydrocarbon radical, n is 1 or 2 when X is halogen, and n is 0, 1 or 2 when X is organoxy. It is a useful reactant for forming surface coatings on electronic parts.Type: ApplicationFiled: October 24, 2013Publication date: May 1, 2014Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Yasufumi KUBOTA, Tohru KUBOTA
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Patent number: 7834120Abstract: A novel monofunctional monomer having a cage oligosiloxane structure is represented by formula (1) wherein X is a polymerizable oxygen-containing C1-C40 group, R1 is a C1-C20 saturated hydrocarbon group, C6-C20 aromatic hydrocarbon group, C1-C20 organoxy group or halogen atom, and R is a non-polymerizable monovalent C1-C40 hydrocarbon group which is optionally halogenated. The monomer has improved compatibility with various solvents and polymerizable monomers. A method for preparing the same is also provided.Type: GrantFiled: October 4, 2005Date of Patent: November 16, 2010Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Ayumu Kiyomori, Tohru Kubota, Yasufumi Kubota, Takayuki Honma
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Publication number: 20060074213Abstract: A novel monofunctional monomer having a cage oligosiloxane structure is represented by formula (1) wherein X is a polymerizable oxygen-containing C1-C40 group, R1 is a C1-C20 saturated hydrocarbon group, C6-C20 aromatic hydrocarbon group, C1-C20 organoxy group or halogen atom, and R is a non-polymerizable monovalent C1-C40 hydrocarbon group which is optionally halogenated. The monomer has improved compatibility with various solvents and polymerizable monomers. A method for preparing the same is also provided.Type: ApplicationFiled: October 4, 2005Publication date: April 6, 2006Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Ayumu Kiyomori, Tohru Kubota, Yasufumi Kubota, Takayuki Honma
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Patent number: 6994945Abstract: Novel silicon-containing polymers are obtained by copolymerizing a vinylsilane monomer with a compound having a low electron density unsaturated bond such as maleic anhydride, maleimide derivatives or tetrafluoroethylene. Using the polymers, chemical amplification positive resist compositions sensitive to high-energy radiation and having a high sensitivity and resolution at a wavelength of less than 300 nm and improved resistance to oxygen plasma etching are obtained.Type: GrantFiled: March 1, 2002Date of Patent: February 7, 2006Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Takanobu Takeda, Jun Hatakeyama, Toshinobu Ishihara, Tohru Kubota, Yasufumi Kubota
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Patent number: 6943264Abstract: By reacting a branched siloxane compound of formula (2) containing compounds of formula (1) as an impurity with a disiloxane compound of formula (3) in the presence of an acid compound, there is prepared a branched siloxane of formula (2) containing a reduced level of compounds of formula (1). R1nSi(OSiR23)3-n(OR3)??(1) R1nSi(OSiR23)4-n??(2) R23SiOSiR23??(3) R1 is a monovalent hydrocarbon group, R2 and R3 are H or monovalent hydrocarbon groups, and n is 0 or 1.Type: GrantFiled: August 26, 2004Date of Patent: September 13, 2005Assignee: Shin-Etsu Chemical, Co., Ltd.Inventors: Yasufumi Kubota, Tohru Kubota
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Patent number: 6875881Abstract: A branched tetrasiloxane is prepared by preforming a liquid mixture of a disiloxane compound, an alcohol and an acid catalyst, adding a trialkoxysilane compound to the mixture for reaction, and adding water to the reaction mixture for co-hydrolysis, thereby forming a branched tetrasiloxane. The method is capable of preparing a branched tetrasiloxane, especially methyltris(trimethylsiloxy)silane having a sufficiently high purity to use as cosmetic oil in good yields.Type: GrantFiled: May 27, 2004Date of Patent: April 5, 2005Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Yasufumi Kubota, Tohru Kubota, Satoshi Onai, Koji Sakuta, Akira Yamamoto
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Publication number: 20050049427Abstract: By reacting a branched siloxane compound of formula (2) containing compounds of formula (1) as an impurity with a disiloxane compound of formula (3) in the presence of an acid compound, there is prepared a branched siloxane of formula (2) containing a reduced level of compounds of formula (1). R1nSi(OSiR23)3-n(OR3)??(1) R1nSi (OSiR23)4-n??(2) R23SiOSiR23??(3) R1 is a monovalent hydrocarbon group, R2 and R3 are H or monovalent hydrocarbon groups, and n is 0 or 1.Type: ApplicationFiled: August 26, 2004Publication date: March 3, 2005Inventors: Yasufumi Kubota, Tohru Kubota
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Publication number: 20040242912Abstract: A branched tetrasiloxane is prepared by preforming a liquid mixture of a disiloxane compound, an alcohol and an acid catalyst, adding a trialkoxysilane compound to the mixture for reaction, and adding water to the reaction mixture for co-hydrolysis, thereby forming a branched tetrasiloxane. The method is capable of preparing a branched lo tetrasiloxane, especially methyltris(trimethylsiloxy)silane having a sufficiently high purity to use as cosmetic oil in good yields.Type: ApplicationFiled: May 27, 2004Publication date: December 2, 2004Inventors: Yasufumi Kubota, Tohru Kubota, Satoshi Onai, Koji Sakuta, Akira Yamamoto
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Patent number: 6518447Abstract: Chlorosilane compounds having a thexyl group which is a bulky substituent group are novel. The compounds are useful silylating agents because stable silylated products are obtained due to the bulky substituent group.Type: GrantFiled: November 5, 2001Date of Patent: February 11, 2003Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Yoichi Tonomura, Tohru Kubota, Yasufumi Kubota
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Patent number: 6498264Abstract: Silyl (meth)acrylate compounds each having attached to a silicon atom one very bulky tertiary hydrocarbon group and two branched hydrocarbon groups each having a hydrocarbon group at &agr;- or &bgr;-position or two cyclic hydrocarbon groups are very stable to hydrolysis and are useful raw materials from which hydrolyzable, self-erodible polymers for ship bottom paints are prepared.Type: GrantFiled: March 5, 2002Date of Patent: December 24, 2002Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Yoichi Tonomura, Tohru Kubota, Yasufumi Kubota
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Publication number: 20020128503Abstract: Silyl (meth)acrylate compounds each having attached to a silicon atom one very bulky tertiary hydrocarbon group and two branched hydrocarbon groups each having a hydrocarbon group at &agr;- or &bgr;-position or two cyclic hydrocarbon groups are very stable to hydrolysis and are useful raw materials from which hydrolyzable, self-erodible polymers for ship bottom paints are prepared.Type: ApplicationFiled: March 5, 2002Publication date: September 12, 2002Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Yoichi Tonomura, Tohru Kubota, Yasufumi Kubota
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Publication number: 20020055647Abstract: Chlorosilane compounds having a thexyl group which is a bulky substituent group are novel. The compounds are useful silylating agents because stable silylated products are obtained due to the bulky substituent group.Type: ApplicationFiled: November 5, 2001Publication date: May 9, 2002Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Yoichi Tonomura, Tohru Kubota, Yasufumi Kubota
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Patent number: 6274754Abstract: 1,2-, 1,3- or 1,4-bis(3-aminopropyldimethylsilyl)benzene is prepared by effecting hydrosilylation reaction between N,N-bis(trimethylsilyl)allylamine and 1,2-, 1,3- or 1,4-bis(dimethylsilyl)benzene in the presence of a platinum catalyst, followed by detrimethylsilylation reaction. The process is simple and inexpensive to synthesize the end compound in high yields without forming isomers.Type: GrantFiled: May 10, 1999Date of Patent: August 14, 2001Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Tohru Kubota, Mikio Endo, Yasufumi Kubota
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Patent number: 5440063Abstract: Dimethylchlorosilane and a triorganochlorosilane of the formula: R.sup.1 R.sup.2 R.sup.3 SiCl wherein R.sup.1, R.sup.2, and R.sup.3 are independently selected from monovalent hydrocarbon groups are concurrently prepared by reacting dimethyldichlorosilane with a SiH bond-containing silane compound of the formula: R.sup.1 R.sup.2 R.sup.3 SiH in the presence of a Lewis acid catalyst. The method is especially effective for concomitant preparation of dimethylchlorosilane and trimethylchlorosilane or t-butyldimethylchlorosilane in an inexpensive, simple, safe manner and in high yields.Type: GrantFiled: November 3, 1994Date of Patent: August 8, 1995Assignee: Shin-Etsu Chemical Company, LimitedInventors: Masaki Takeuchi, Akira Yamamoto, Mikio Endo, Tohru Kubota, Yasufumi Kubota