Patents by Inventor Chihiro Imai

Chihiro Imai 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).

  • Patent number: 4966981
    Abstract: In a process for the preparation of epoxy group-containing alkoxy silanes by hydrosililation of a terminally unsaturated epoxy compound with a hydro-alkoxy silane using a platinum catalyst, the improvement comprising carrying out the hydrosililation in the presence of an alcohol. By this process formation of the internally sililated isomer can be suppressed and the desired terminally sililated poduct can be produced at an approximately 100% selectivity.
    Type: Grant
    Filed: March 5, 1990
    Date of Patent: October 30, 1990
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Haruko Takai, Taiji Sakiyama, Kimishige Matsuzaki, Toshio Nozaki, Yoshiharu Okumura, Chihiro Imai
  • Patent number: 4921901
    Abstract: A novel block copolymer is disclosed which includes a random ethylene-propylene copolymer segment (A) and a methacrylate segment (B). The block copolymer has a number-average molecular weight of about 1,000 to about 600,000 and a ratio of (A) to (B) of 15/85 to 97/3 by weight.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: May 1, 1990
    Assignee: Toa Nenryo Kogyo KK
    Inventors: Satoshi Ueki, Tokuo Makishima, deceased, Chihiro Imai
  • Patent number: 4914163
    Abstract: According to the present invention, heterocyclic copolymers comprising recurring units [A] and [B] having specific structures are obtained by hydrolyzing reaction products of diisocyanate compounds having specific structures with tolidine diisocyanate and hydrogen cyanide.The heterocyclic copolymers thus obtained are excellent in mechanical strength, heat resistance and solvent resistance.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: April 3, 1990
    Assignees: Tonen Sekiyu Kagaku Kabushiki Kaisha, Nitto Chemical Industry Co., Ltd.
    Inventors: Kazuyuki Sakota, Wataru Minoshima, Takayuki Masuda, Chihiro Imai, Tetsuro Nakahama, Toshimitsu Sugawara, Yoshio Nakagawa
  • Patent number: 4912170
    Abstract: This invention relates to a p-methyl styrene polymer represented by the following formula: ##STR1## Z denotes a group such as a functional group. Poly p-methylstyrene (PPMS) is lithiated by reaction with n-butyllithium. The lithiated PPMS is used to prepare polymers containing functional groups. As an example, a solution of PPMS (MW 260,000), 1.0 g in 20 ml of cyclohexane, was reacted with n-butyllithium, 8.5 mmol, and tetramethylethylenediamine, 8.7 mmol, for 20 hours to obtain a precipitate. The precipitate was dissolved in THF, and CO.sub.2 was blown into the solution. The solution was washed with an aqueous solution of HCl and dropped into methanol to obtain a solid polymer having carboxyl group functionality.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: March 27, 1990
    Assignee: Toa Nenryo Kogyo K.K.
    Inventors: Tadashi Niwa, Masayuki Kato, Yoshio Taguchi, Chihiro Imai, Tokuo Makishima, deceased, by Nobuko Makishima, legal representative
  • Patent number: 4888436
    Abstract: A process for preparing aminopropyl alkoxy silanes comprising reacting an allylamine having at least one active hydrogen atom attached to the amine nitrogen atom with a hydro-alkoxy silane having from 1 to 3 alkoxy groups attached to the silicon atom in the presence of a rhodium complex having inorganic ligands, at least one of said ligands being carbonyl. By this process the desired gamma-isomer can be prepared in a high selectivity and yield within a short reaction time. When the reaction is carried out in the presence of carbon monoxide and/or a cyclic olefinic compound, the selectivity and yield of the gamma-isomer can be further improved. The presence of carbon monooxide in the reaction system further serves to lengthen the catalyst life and to reduce the amount of the catalyst to be used.
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: December 19, 1989
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Kouji Shiozawa, Haruko Takai, Kazutoshi Takatsuna, Nobukazu Okamoto, Yoshiharu Okumura, Chihiro Imai
  • Patent number: 4849483
    Abstract: A process for producing a catalyst component for polymerization of olefins which comprises contacting (a) a metal oxide with (b) a magnesium alkoxide, contacting the resulting contact product with (c) a halogen-containing compound, and finally contacting the resulting contact product with (d) a titanium compound.
    Type: Grant
    Filed: April 16, 1987
    Date of Patent: July 18, 1989
    Assignee: Toa Nenryo Kogyo K.K.
    Inventors: Mamoru Tachikawa, Masato Sakuma, Satoshi Ueki, Chihiro Imai, Tokuo Makishima
  • Patent number: 4820674
    Abstract: A process for preparing a hydrosilylation catalyst by dissolving chloroplatinic acid H.sub.2 PtCl.sub.6 in a cyclic ether or cyclic ester containing at least 3 carbon atoms, and maintaining the resulting solution at a temperature of at least 30.degree. C.
    Type: Grant
    Filed: January 27, 1988
    Date of Patent: April 11, 1989
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Kouji Shiozawa, Yoshiharu Okumura, Chihiro Imai, Nobukazu Okamoto
  • Patent number: 4801654
    Abstract: A block copolymer is disclosed which includes an ethylene-propylene copolymer segment (A) and a tetrahydrofuran segment (B). The weight ratio of (A) to (B) is 5/95 to 95/5, and the block copolymer has a number-average molecular weight of about 1,000 to about 1,000,000.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: January 31, 1989
    Assignee: Toa Nenryo Kogyo K.K.
    Inventors: Tokuo Makishima, deceased, by Nobuko Makishima, legal representative, Satoshi Ueki, Chihiro Imai
  • Patent number: 4788261
    Abstract: A polyarylene sulfide resin composition with an improved moldability and heat resistance is provided which comprises (a) 40 to 99% by weight of a polyarylene sulfide resin and (b) 1 to 60% by weight of a polyparabanic acid having the following recurring unit: ##STR1## wherein Z and Z.sup.1 are oxygen atoms or NH group, Z and Z.sup.1 being not simultaneously NH groups, and R is ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are hydrogen atoms or methyl groups, and X and X.sup.1 are bonds, CH.sub.2 groups, oxygen atoms, sulfur atoms, SO.sub.
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: November 29, 1988
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Yoshio Taguchi, Youichi Imai, Tadashi Niwa, Masayuki Kato, Chihiro Imai
  • Patent number: 4737555
    Abstract: A process for producing a catalyst component for polymerization of olefins which comprises contacting (a) a metal oxide with (b) an organomagnesium compound represented by the formula RMgR' wherein R denotes a hydrocarbyl group and R' denotes a hydrocarbyl group or a halogen atom, contacting the resulting contacting product with (c) carbon dioxide, and further contacting the resulting contact product with (d) a titanium compound. Optionally, the carbon dioxide contacted contact product can be treated with the halogen-containing compound prior to contact with the titanium compound.
    Type: Grant
    Filed: April 22, 1987
    Date of Patent: April 12, 1988
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Mamoru Tachikawa, Satoshi Ueki, Masato Sakuma, Chihiro Imai, Tokuo Makishima
  • Patent number: 4704438
    Abstract: A novel styrene copolymer having a functional group, i.e. silyl group on the para-position of the aromatic ring, useful as a functional polymer, is provided. An effective process for the production thereof comprises contacting a random or block copolymer of p-methylstyrene and .alpha.-methylstyrene with an organolithium compound to lithiate partly the p-methyl group in the copolymer and then reacting the lithiated copolymer with a silicon compound represented by the general formula (R.sup.1)(R.sup.2)(R.sup.3)SiX wherein R.sup.1, R.sup.2 and R.sup.3 are, same or different, alkyl groups with 1 to 6 carbon atoms or alkenyl groups with 2 to 6 carbon atoms, at least one of R.sup.1, R.sup.2 and R.sup.3 being an alkenyl group, and X is a halogen atom.
    Type: Grant
    Filed: April 6, 1987
    Date of Patent: November 3, 1987
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Tadashi Niwa, Masayuki Kato, Yoshio Taguchi, Chihiro Imai
  • Patent number: 4704433
    Abstract: A novel block copolymer is disclosed which includes a random ethylene-propylene copolymer segment (A) and a methacrylate segment (B). The block copolymer has a number-average molecular weight of about 1,000 to about 600,000 and a ratio of (A) to (B) of 15/85 to 97/3 by weight.
    Type: Grant
    Filed: May 24, 1985
    Date of Patent: November 3, 1987
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Satoshi Ueki, Chihiro Imai, Tokuo Makishima, deceased
  • Patent number: 4686199
    Abstract: A process for producing a catalyst component for polymerization of olefins which comprises contacting (a) a metal oxide with (b) a magnesium alkoxide, contacting the resulting contact product with (c) a halogen-containing compound, and finally contacting the resulting contact product with (d) a titanium compound.
    Type: Grant
    Filed: November 27, 1985
    Date of Patent: August 11, 1987
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Mamoru Tachikawa, Masato Sakuma, Satoshi Ueki, Chihiro Imai, Tokuo Makishima
  • Patent number: 4683275
    Abstract: A copolymer of p-methylstyrene and N-substituted maleimide exhibits high temperature stability.
    Type: Grant
    Filed: September 20, 1985
    Date of Patent: July 28, 1987
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Masayuki Kato, Yoshio Taguchi, Chihiro Imai, Tokuo Makishima, deceased
  • Patent number: 4678767
    Abstract: A process for producing a catalyst component for polymerization of olefins which comprises contacting (a) a metal oxide with (b) an organomagnesium compound represented by the formula RMgR' wherein R denotes a hydrocarbyl group and R' denotes a hydrocarbyl group or a halogen atom, contacting the resulting contacting product with (c) carbon dioxide, and further contacting the resulting contact product with (d) a titanium compound. Optionally, the carbon dioxide contacted product can be treated with the halogen-containing compound prior to contact with the titanium compound.
    Type: Grant
    Filed: November 27, 1985
    Date of Patent: July 7, 1987
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Mamoru Tachikawa, Satoshi Ueki, Masato Sakuma, Chihiro Imai, Tokuo Makishima
  • Patent number: 4647550
    Abstract: A catalyst component for the polymerization of olefins which is prepared by contacting a contact reaction product of (a) a metal oxide, (b) an organic magnesium compound, and (c) an alkoxy group-containing compound held in contact with (d) a titanium compound.
    Type: Grant
    Filed: July 31, 1985
    Date of Patent: March 3, 1987
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Tadanao Kohora, Satoshi Ueki, Mamoru Tachikawa, Chihiro Imai, Tokuo Makishima, deceased
  • Patent number: 4426314
    Abstract: According to a first aspect of this invention, there is provided A magnesium-containing solid, obtained by contacting the reaction product of (1):(A) metallic magnesium;(B) a halogenated hydrocarbon of the general formula RX in which R stands for an alkyl, aryl or cycloalkyl group having 1 to 20 carbon atoms, and X stands for a halogen atom; and(C) an alkoxy compound of the general formula X'.sub.m C(OR').sub.4-m in which X' stands for a hydrogen or halogen atom, or an alkyl, aryl or cycloalkyl group having 1 to 10 carbon atoms, R' stands for an alkyl, aryl or cycloalkyl group having 1 to 20 carbon atoms, and m is 0, 1 or 2, with (2) an electron donative compound and hydrogen halide. The supported transition metal in combination with an organoaluminum co-catalyst is employed as an olefin polymerization catalyst.
    Type: Grant
    Filed: November 10, 1981
    Date of Patent: January 17, 1984
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Makoto Miyazaki, Takeshi Nomura, Chihiro Imai, Makoto Yoda
  • Patent number: 4402863
    Abstract: According to this invention, there is provided a magnesium-containing solid, obtained by contacting the reaction product of (1):a magnesium-containing solid, obtained by contacting the reaction product of:(a) metallic magnesium;(b) a halogenated hydrocarbon of the general formula RX in which R stands for an alkyl, aryl or cycloalkyl group having 1 to 20 carbon atoms, and X stands for a halogen atom; and(c) an alkoxy compound of the general formula X'.sub.m C(OR').sub.4-m in which X' stands for a hydrogenor halogen atoms, or an alkyl, aryl or a cycloalkyl group having 1 to 10 carbon atoms, R' stands for an alkyl, aryl or cycloalkyl group having 1 to 20 carbon atoms and m is 0, 1 or 2, with (2) an organic aluminum compound.The magnesium-containing solid is employed as a carrier for a transition metal halide. The supported transition metal halide in combination with an aluminum alkyl cocatalyst such as aluminum triethyl is usefully employed for the polymerization of olefins.
    Type: Grant
    Filed: November 10, 1981
    Date of Patent: September 6, 1983
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Makoto Miyazaki, Takeshi Nomura, Chihiro Imai, Makoto Yoda