Patents by Inventor Tohru Kubota

Tohru 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).

  • Silylation of hydroxyl groups
    Publication number: 20030139619
    Abstract: A compound having a non-silanol hydroxyl group and a compound having a silanol group are subjected to dehydrative condensation in the presence of a compound of formula (1), (2) or (3):
    Type: Application
    Filed: January 21, 2003
    Publication date: July 24, 2003
    Inventors: Hiromi Nishiwaki, Ayumu Kiyomori, Tohru Kubota
  • Thexylchlorosilanes and making process
    Patent number: 6518447
    Abstract: 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: Grant
    Filed: November 5, 2001
    Date of Patent: February 11, 2003
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoichi Tonomura, Tohru Kubota, Yasufumi Kubota
  • Silyl (meth)acrylates having bulky substituent group and preparation thereof
    Patent number: 6498264
    Abstract: 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: Grant
    Filed: March 5, 2002
    Date of Patent: December 24, 2002
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoichi Tonomura, Tohru Kubota, Yasufumi Kubota
  • Silicon-containing polymer, resist composition and patterning process
    Publication number: 20020168581
    Abstract: 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: Application
    Filed: March 1, 2002
    Publication date: November 14, 2002
    Applicant: Shin-Etsu Chemical Co., Ltd.
    Inventors: Takanobu Takeda, Jun Hatakeyama, Toshinobu Ishihara, Tohru Kubota, Yasufui Kubota
  • Silyl (meth)acrylates having bulky substituent group and preparation thereof
    Publication number: 20020128503
    Abstract: 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: Application
    Filed: March 5, 2002
    Publication date: September 12, 2002
    Applicant: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoichi Tonomura, Tohru Kubota, Yasufumi Kubota
  • Preparation of bissilylnorbornane compounds
    Patent number: 6426427
    Abstract: A bissilylnorbornane compound is prepared by reacting 2,5-norbornadiene with a hydrogenchlorosilane in the presence of a mixture of a palladium compound and a phosphite or a palladium complex having a phosphate ligand as a catalyst. The bissilylnorbornane compound can be produced in high yields while suppressing formation of by-product nortricyclene.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: July 30, 2002
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoichi Tonomura, Tohru Kubota, Mikio Endo
  • Thexylchlorosilanes and making process
    Publication number: 20020055647
    Abstract: 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: Application
    Filed: November 5, 2001
    Publication date: May 9, 2002
    Applicant: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoichi Tonomura, Tohru Kubota, Yasufumi Kubota
  • PREPARATION OF BISSILYLNORBORNANE COMPOUNDS
    Publication number: 20020035286
    Abstract: A bissilylnorbornane compound is prepared by reacting 2,5-norbornadiene with a hydrogenchlorosilane in the presence of a mixture of a palladium compound and a phosphite or a palladium complex having a phosphite ligand as a catalyst. The bissilylnorbornane compound can be produced in high yields while suppressing formation of by-product nortricyclene.
    Type: Application
    Filed: August 24, 2001
    Publication date: March 21, 2002
    Applicant: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoichi Tonomura, Tohru Kubota, Mikio Endo
  • Preparation of halopropyldimethylchlorosilanes
    Patent number: 6359161
    Abstract: A halopropyldimethylchlorosilane is prepared by reacting dimethylchlorosilane with an allyl halide in the presence of an iridium catalyst. The reaction is effected in the presence of an internal olefin compound, typically 1,5-cyclooctadiene. The internal olefin compound suppresses deactivation of the iridium catalyst during reaction. Using a smaller amount of the iridium catalyst, the process produces the halopropyldimethylchlorosilane in high yields.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: March 19, 2002
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoichi Tonomura, Tohru Kubota, Mikio Endo
  • Polymers, resist compositions and patterning process
    Publication number: 20020012871
    Abstract: Polymers comprising recurring units of formula (1) are provided wherein R1 is a straight, branched or cyclic divalent C1-20 hydrocarbon group or a bridged cyclic hydrocarbon group, R is hydrogen atom or an acid labile group, 0≦m≦3, 0≦n≦3 and 0≦m+n≦6.
    Type: Application
    Filed: June 1, 2001
    Publication date: January 31, 2002
    Applicant: Shin-Etsu Chemical Co., Ltd.
    Inventors: Jun Hatakeyama, Toshiaki Takahashi, Toshinobu Ishihara, Jun Watanabe, Tohru Kubota, Yoshio Kawai
  • Process for preparing tetrakis (trimethylsily) silane and tris (trimethysilyl) silane
    Patent number: 6337415
    Abstract: Tetrakis(trimethylsilyl)silane is prepared by reacting tetrachlorosilane with chlorotrimethylsilane in the presence of lithium metal, adding a compound with active proton(s) to the reaction mixture for treating the residual lithium metal therewith while maintaining the mixture neutral or acidic, and separating tetrakis(trimethylsilyl)silane from the organic layer. The residual lithium metal is treated in a safe and simple manner. Reaction of the tetrakis(trimethylsilyl)silane with an alkyl lithium or alkali metal alkoxide, followed by acid hydrolysis, affords tris(trimethylsilyl)silane. The desired compounds are prepared in high yields and on an industrial scale.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: January 8, 2002
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Ayumu Kiyomori, Tohru Kubota, Takeshi Kinsho, Koji Hasegawa, Takeru Watanabe
  • Distillation of (meth) acryloxy-bearing alkoxysilane
    Patent number: 6334935
    Abstract: A (meth)acryloxy-bearing alkoxysilane is isolated and purified to a high purity by distilling a reaction solution containing the (meth)acryloxy-bearing alkoxysilane in a thin-layer distillation device at a temperature of 90-160° C. and a vacuum of 1-15 mmHg. The resulting alkoxysilane product does not give rise to the quality problem that the product will gradually whiten during storage owing to contact with air. The occurrence of self-polymerization of the alkoxysilane is restrained.
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: January 1, 2002
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Katsuhiro Uehara, Mikio Endo, Tohru Kubota, Satoshi Uchida, Kanji Murofushi
  • Preparation of halopropyldimethylchlorosilanes
    Publication number: 20010053861
    Abstract: A halopropyldimethylchlorosilane is prepared by reacting dimethylchlorosilane with an allyl halide in the presence of an iridium catalyst. The reaction is effected in the presence of an internal olefin compound, typically 1,5-cyclooctadiene. The internal olefin compound suppresses deactivation of the iridium catalyst during reaction. Using a smaller amount of the iridium catalyst, the process produces the halopropyldimethylchlorosilane in high yields.
    Type: Application
    Filed: May 11, 2001
    Publication date: December 20, 2001
    Inventors: Yoichi Tonomura, Tohru Kubota, Mikio Endo
  • DISTILLATION OF (METH) ACRYLOXY-BEARING ALKOXYSILANE
    Publication number: 20010050217
    Abstract: A (meth)acryloxy-bearing alkoxysilane is isolated and purified to a high purity by distilling a reaction solution containing the (meth)acryloxy-bearing alkoxysilane in a thin-layer distillation device at a temperature of 90-160° C. and a vacuum of 1-15 mmHg. The resulting alkoxysilane product does not give rise to the quality problem that the product will gradually whiten during storage owing to contact with air. The occurrence of self-polymerization of the alkoxysilane is restrained.
    Type: Application
    Filed: June 18, 1999
    Publication date: December 13, 2001
    Inventors: KATSUHIRO UEHARA, MIKIO ENDO, TOHRU KUBOTA, SATOSHI UCHIDA, KANJI MUROFUSHI
  • Preparation of tris (trimethylsilyl) silylethyl esters
    Patent number: 6291696
    Abstract: An industrially acceptable process for preparing 2-[tris(trimethylsilyl)silyl]ethyl (meth)acrylate in high yields involves reacting 2-[tris(trimethylsilyl)silyl]ethyl acetate with an alcohol in the presence of a catalyst to form 2-[tris(trimethylsilyl)silyl]ethanol, then reacting it with a (meth)acrylate ester.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: September 18, 2001
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Takeshi Kinsho, Koji Hasegawa, Takeru Watanabe, Tohru Kubota, Ayumu Kiyomori
  • Preparation of bis(3-aminopropyldimethylsilyl)benzene compounds
    Patent number: 6274754
    Abstract: 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: Grant
    Filed: May 10, 1999
    Date of Patent: August 14, 2001
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Tohru Kubota, Mikio Endo, Yasufumi Kubota
  • Preparation of tris (trimethylsilyl) silylethyl esters
    Publication number: 20010007909
    Abstract: An industrially acceptable process for preparing 2-[tris(trimethylsilyl)silyl]ethyl (meth)acrylate in high yields involves reacting 2-[tris(trimethylsilyl)silyl]ethyl acetate with an alcohol in the presence of a catalyst to form 2-[tris(trimethylsilyl)silyl]ethanol, then reacting it with a (meth)acrylate ester.
    Type: Application
    Filed: January 5, 2001
    Publication date: July 12, 2001
    Inventors: Takeshi Kinsho, Koji Hasegawa, Takeru Watanabe, Tohru Kubota, Ayumu Kiyomori
  • Hydrosilylation of 4-vinyl-1-cyclohexene
    Patent number: 6245925
    Abstract: By reacting 4-vinyl-1-cyclohexene with a hydrogenchlorosilane compound in the presence of a platinum catalyst to give a reaction solution containing a monosilyl compound, removing the residual 4-vinyl-1-cyclohexene and isomers thereof from the reaction solution, and reacting the monosilyl compound again with the hydrogenchlorosilane compound, an organic silicon compound in which the two double bonds in 4-vinyl-1-cyclohexene have been hydrosilylated is produced in high yields.
    Type: Grant
    Filed: July 27, 2000
    Date of Patent: June 12, 2001
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoichi Tonomura, Tohru Kubota, Mikio Endo
  • Silylation of hydroxyl group-containing compound
    Patent number: 6239303
    Abstract: A hydroxyl group-containing compound is silylated by reacting it with an organohydrosilane compound in the presence of a ruthenium complex catalyst having carbonyl groups as ligands. Silylation takes place in a short time while the amount of the catalyst is minimized.
    Type: Grant
    Filed: October 17, 2000
    Date of Patent: May 29, 2001
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Kenji Funatsu, Tohru Kubota, Mikio Endo
  • Preparation of 1,3-bis(3-aminopropyl)tetramethyldisiloxane
    Patent number: 6087520
    Abstract: By subjecting to hydrosilylation a hydrogendimethylalkoxysilane compound and an N-silylated allylamine compound in the presence of a platinum catalyst, adding an alcohol to the reaction product to effect desilylation reaction, and hydrolyzing the resulting 3-aminopropyldimethylalkoxysilane compound, 1,3-bis(3-aminopropyl)tetramethyldisiloxane is prepared. The end product free of isomers and of quality can be prepared through simple steps, at a low cost and in high yields.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: July 11, 2000
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Tohru Kubota, Mikio Endo