Patents by Inventor Mamoru Tachikawa

Mamoru Tachikawa 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: 5986124
    Abstract: A method for preparing compounds containing (hydrocarbonoxy)silyl groups by reacting an unsaturated organic compound with a hydrido (hydrocarbonoxy)silane compounds by means of the catalytic action of platinum or a platinum compound in the presence of a carboxylic acid compound.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: November 16, 1999
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Mamoru Tachikawa, Kasumi Takei
  • Patent number: 5891529
    Abstract: Curable compositions comprising a substance that produces a base when exposed to radiation and a polymer molecule that contains silicon-hydrogen bonds which react with hydroxyl groups under the action of the base to form silicon-oxygen bonds (Si--O) and hydrogen molecules. These compositions cure when exposed to radiation. A pattern can be formed by placing a mask between a coating of the composition and the radiation source during this exposure episode and thereafter dissolving the uncured composition. The compositions have little weight loss during their cure, they can be cured by low intensity radiation, and they yield heat-resistant cured products.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: April 6, 1999
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian Robert Harkness, Mamoru Tachikawa
  • Patent number: 5861468
    Abstract: 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: Grant
    Filed: December 1, 1995
    Date of Patent: January 19, 1999
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian Robert Harkness, Mamoru Tachikawa, Kasumi Takeuchi
  • Patent number: 5861235
    Abstract: This invention pertains to a curable composition comprising a N-substituted 4-(o-nitrophenyl)dihydropyridine (a compound that generates base under the action of ultraviolet radiation) and a silanol-containing polymer that condenses under the action of the base generated to form a siloxane bond. The compositions of the instant invention cure by exposure to ultraviolet radiation. Cured patterns may be formed from the curable composition by interposing a mask between a film of the said composition and the radiation source during UV exposure, then dissolving and removing the uncured composition to form a pattern, and thereafter heating the residual material. The compositions can be cured by low-strength ultraviolet radiation and produce a highly heat-resistant cured product.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: January 19, 1999
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian R. Harkness, Mamoru Tachikawa, Kasumi Takei
  • Patent number: 5820944
    Abstract: The present invention pertains to a curable composition which comprises a) a N-substituted 4-(o-nitrophenyl)dihydropyridine which constitutes a base-generating substance that is caused to generate a base by the action of ultraviolet light, and (b) a silicone polymer (R.sub.2 SiO.sub.2/2)(RSiO.sub.3/2) containing silicon-hydrogen bonds (Si--H) which are capable of reacting with hydroxy groups to form silicon-oxygen bonds (Si--O) and hydrogen molecules (H.sub.2) under the effect of the base. This composition is cured by irradiation with ultraviolet light. Patterns are formed by placing a mask between a coating film of the composition and the ultraviolet light source during the irradiation with ultraviolet light, and then dissolving and removing the uncured portions of the composition following said irradiation.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: October 13, 1998
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian R. Harkness, Mamoru Tachikawa, Kasumi Takei
  • Patent number: 5789460
    Abstract: Curable compositions comprising a substance that produces a base when exposed to radiation and a polymer molecule that contains silicon-hydrogen bonds which react with hydroxyl groups under the action of the base to form silicon-oxygen bonds (Si--O) and hydrogen molecules. These compositions cure when exposed to radiation. A pattern can be formed by placing a mask between a coating of the composition and the radiation source during this exposure episode and thereafter dissolving the uncured composition. The compositions have little weight loss during their cure, they can be cured by low intensity radiation, and they yield heat-resistant cured products.
    Type: Grant
    Filed: January 24, 1996
    Date of Patent: August 4, 1998
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian Robert Harkness, Mamoru Tachikawa
  • Patent number: 5614603
    Abstract: The introduction of a highly spin-coatable silicone resin that does not produce large amounts of volatiles during its cure, and that is a precursor to highly heat-resistant, optically transparent cured products that exhibit an excellent hardness. The silicone resin comprises a silicone polymer of the general formula:(Ph.sub.2 SiO).sub.a (HSiO.sub.3/2).sub.b (R.sup.1 SiO.sub.3/2).sub.cin which R.sup.1 is hydrogen or C.sub.1 to C.sub.8 hydrocarbon group, possibly containing a heteroatom, Ph is a phenyl group and 6.ltoreq.a+b+c.ltoreq.1,000, 0.6>a/(a+b+c).gtoreq.0.4, and 1.0.gtoreq.b/(b+c).gtoreq.0.2.
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: March 25, 1997
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian R. Harkness, Mamoru Tachikawa, Kasumi Takeuchi
  • Patent number: 5516871
    Abstract: There is disclosed a diphenylsiloxane oligomer functionalized at both terminals and methods for the preparation thereof, said oligomer having the following general formulaG-(OSiPh.sub.2).sub.m O-G (i)wherein Ph denotes a phenyl radical, m is 3 to 50 and G has a formula independently selected from the group consisting of ##STR1## in which R, R.sup.4 and R.sup.5 are independently selected from the group consisting of methyl, phenyl and R.sup.1, R.sup.1 is selected from the group consisting of hydrogen and a monovalent hydrocarbon group having 2 to 8 carbon atoms excluding phenyl, tolyl, xylyl, and ethylphenyl radicals, Q is a divalent hydrocarbon group and k is independently 0 to 3 at each terminus of said oligomer with the proviso that k is >0 at one terminus of said oligomer, at least one substituent among R, R.sup.4 and R.sup.5 in formula (ii) is R.sup.1 and, when both R.sup.4 and R.sup.5 groups at one terminus of said oligomer are phenyl, groups R.sup.4 and R.sup.
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: May 14, 1996
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian R. Harkness, Mamoru Tachikawa
  • Patent number: 5502229
    Abstract: There is disclosed a diphenylsiloxane oligomer functionalized at both terminals, and methods for the preparation thereof, said oligomer having the following general formula G-(OSi(Ph).sub.2).sub.m O--G wherein Ph denotes a phenyl radical, m is 3 to 50 and G is has a formula independently selected from the group consisting of ##STR1## in which R.sup.1 is independently selected from the group consisting of hydrogen and a monovalent hydrocarbon group having 2 to 8 carbon atoms, said monovalent hydrocarbon group excluding phenyl, tolyl, xylyl, and ethylphenyl radicals, R is independently selected from the group consisting of R.sup.1, methyl radical and phenyl radical, Q is a divalent hydrocarbon group and n is an integer having a value of 1 to 3.
    Type: Grant
    Filed: March 14, 1995
    Date of Patent: March 26, 1996
    Assignee: Dow Corning Asia, Ltd.
    Inventors: Brian R. Harkness, Mamoru Tachikawa, Kasumi Takeuchi
  • Patent number: 5446180
    Abstract: Novel 1-aza-3-oxa-4-silacyclohex-1-ene compounds, and tautomers thereof, having utility as chemical modifiers or cross linkers for hydroxy-containing organic or inorganic substances are disclosed, said compounds being represented by the general formula (I) ##STR1## wherein R.sup.1 and R.sup.2 each independently denotes a monovalent organic group having 1 to 6 carbon atoms selected from the group consisting of saturated hydrocarbon groups and unsaturated hydrocarbon groups, R.sup.3 deontes an organic group having 1 to 30 carbon atoms selected from the group consisting of saturated hydrocarbon groups and unsaturated hydrocarbon groups, said R.sup.3 groups optionally containing a heteroatom selected from the group consisting of oxygen, nitrogen, sulfur, silicon, fluorine, chlorine, bromine and iodine, Me denotes a methyl radical and n is an integer having a value of 1 to 4.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: August 29, 1995
    Assignee: Dow Corning Asia Ltd.
    Inventor: Mamoru Tachikawa
  • Patent number: 5281737
    Abstract: The present invention introduces novel 1-aza-2-silacyclobutane compounds whose nitrogen is substituted by a hydrocarbon group or heteroatom-containing hydrocarbon group, whose N--Si bond remains highly reactive, and which are very effective as silanol endblocking agents and silane coupling agents. The present invention also introduces a method for the preparation of these novel 1-aza-2-silacyclobutanes by the intramolecular hydrosilylation reaction of N,N-disubstituted aminosilane.
    Type: Grant
    Filed: July 1, 1993
    Date of Patent: January 25, 1994
    Assignee: Dow Corning Japan, Ltd.
    Inventor: Mamoru Tachikawa
  • Patent number: 5281736
    Abstract: The present invention relates to a method for the preparation of 1-aza-2-silacyclopentane compounds whose nitrogen is substituted by a hydrocarbon group or a heteroatom-containing hydrocarbon group. The method comprises effecting an intramolecular hydrosilylation reaction of a N,N-disubstituted aminosilane. In a preferred method, the intramolecular hydrosilylation reaction is conducted in the presence of a rhodium-containing catalyst.
    Type: Grant
    Filed: June 23, 1993
    Date of Patent: January 25, 1994
    Assignee: Dow Corning Japan, Ltd.
    Inventor: Mamoru Tachikawa
  • Patent number: 5037908
    Abstract: An improved process for polymerizing butene-1 in the presence of a polymerization catalyst composed of (a) a catalyst component containing titanium and halogen as essential constituents and (b) an organometallic compound, wherein the improvement comprises bringing said catalyst component into contact with an activity inhibitor when said catalyst component is activated or after said catalyst component has been activated with said organometallic compound, and subsequently polymerizing butene-1.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: August 6, 1991
    Assignee: Toa Nenryo Kogyo K.K.
    Inventors: Mamoru Tachikawa, Satoshi Ueki, Masato Sakuma, Makoto Miyazaki
  • Patent number: 4921988
    Abstract: A process for preparing aminopropyl silanes in which an allylamine is reacted with a hydrosilane in the presence of a catalyst comprising (i) metallic rhodium or a rhodium compound and (ii) a basic compound. By the proposed process the corresponding gammaaminopropyl silane can be prepared in a high selectivity and yield within a short period of reaction time.
    Type: Grant
    Filed: December 6, 1988
    Date of Patent: May 1, 1990
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Kazutoshi Takatsuna, Mamoru Tachikawa, Kouji Shinozawa, Masashi Nakajima, Akihito Shinohara, Yoshiharu Okumura
  • Patent number: 4897501
    Abstract: In a process for preparing aminopropyl alkoxy silanes comprising reacting an allylamine with a hydro-alkoxy silane in the presence of a rhodium catalyst, the improvement which comprises use of a rhodium phosphide or its oligomer as said rhodium catalyst. By this process the desired gamma-isomer can be prepared in a high selectivity and yield within a short reaction time.
    Type: Grant
    Filed: July 29, 1988
    Date of Patent: January 30, 1990
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Kazutoshi Takatsuna, Mamoru Tachikawa, Kouji Shiozawa, Nobukazu Okamoto, Yoshiharu Okumura
  • 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: 4775651
    Abstract: Silanes are produced by the disproportionation and/or redistribution reaction of chlorosilanes using a novel catalyst having a longer life and consisting of a quaternary phosphonium salt bonded to an organic macromolecule or polymer, represented by the following general formula: ##STR1## wherein .circle.P.circle. is an organic macromolecule or polymer, A is a bridging group between phosphorus and the organic macromolecule or polymer, R.sup.1, R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, C.sub.1 -C.sub.20 alkyl groups and aralkyl groups such as benzyl and phenethyl groups, which can contain oxygen or halogen atoms, and X is a halogen atom.
    Type: Grant
    Filed: November 17, 1987
    Date of Patent: October 4, 1988
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Mamoru Tachikawa, Kazutoshi Takatsuna, Kouji Shiozawa, Yoshiharu Okumura, Takeo Koyama
  • 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: 4725420
    Abstract: Silanes are produced by the disproportionation and/or redistribution reaction of chlorosilanes using a novel catalyst having a longer life and consisting of a quaternary phosphonium salt bonded to an organic macromolecule or polymer, represented by the following general formula: ##STR1## wherein .circle.P is an organic macromolecule or polymer, A is a bridging group between phosphorus and the organic macromolecule or polymer, R.sup.1, R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, C.sub.1 -C.sub.20 alkyl groups and aralkyl groups such as benzyl and phenethyl groups, which can contain oxygen or halogen atoms, and X is a halogen atom.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: February 16, 1988
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Mamoru Tachikawa, Kazutoshi Takatsuna, Kouji Shiozawa, Yoshiharu Okumura, Takeo Koyama
  • 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