Patents by Inventor Isao Sasaki
Isao Sasaki 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: 5132371Abstract: A methacrylimide-containing polymer comprising a polymer (A) comprised of 5-100 weight % of units represented by the formula (I): ##STR1## wherein R is H or C1-20 hydrocarbon group, and 0-95 weight % of units derived from an ethylenic monomer, wherein a polymer derived from at least one ethylenic monomer has been grafted onto the polymer (A). The methacrylimide-containing polymer is used as a blend with another thermoplastic polymer.Type: GrantFiled: December 11, 1989Date of Patent: July 21, 1992Assignee: Mitsubishi Rayon Company Ltd.Inventors: Isao Sasaki, Kozi Nishida, Masaharu Fujimoto
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Patent number: 5132359Abstract: A vinyl chloride resin composition having excellent impact resistance even at a low temperature and good weather resistance is disclosed. Such vinyl chloride resin composition comprises:(A) a vinyl chloride resin, and(B) a compound rubber type graft copolymerwherein one or more vinyl monomers are graft-polymerized onto a compound rubber that has an average particle diameter of 0.08 to 0.6 .mu.m and possesses such a structure that 1 to 10 wt. % of a polyorganosiloxane rubber component and 90 to 99 wt. % of a polyalkyl (meth)acrylate rubber component are entangled in an inseparable fashion, and the total amount of the polyorganosiloxane rubber component and the polyalkyl (meth)acrylate rubber component is 100 wt. %.Type: GrantFiled: July 13, 1990Date of Patent: July 21, 1992Assignee: Mitsubishi Rayon Company, Ltd.Inventors: Isao Sasaki, Naoki Yamamoto, Akira Yanagase
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Patent number: 5124403Abstract: Disclosed is a thermoplastic resin composition consisting essentially of(1) 1 to 97 parts by weight of a methacrylimide-containing thermoplastic polymer (A) containing at least 10% by weight of methacrylimide units of the general formula ##STR1## where R is a hydrogen atom or an aliphatic, aromatic or alicyclic hydrocarbon groups of 1 to 20 carbon atoms, the methacrylimide-containing polymer (A) including acid groups and acid anhydride group in an amount of not less than 0.41 milliequivalent per gram of the thermoplastic polymer;(2) 1 to 97 parts by weight of a thermoplastic polyester (B); and(3) 2 to 98 parts by weight of a polycarbonate resin (C); the combined amount of components (A) to (C) being 100 parts by weight.Type: GrantFiled: November 6, 1989Date of Patent: June 23, 1992Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Isao Sasaki, Kozi Nishida, Masaharu Fujimoto
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Patent number: 5096976Abstract: Disclosed is a thermoplastic methacrylimide-containing polymer comprising 2 to 100% by weight of structural units represented by the following formula (I): ##STR1## wherein R is hydrogen or a hydrocarbon group having 1 to 20 carbon atoms, and 0 to 98% by weight of structural units derived from an ethylenically unsaturated monomer, wherein the number of fine particles having a size of 0.5 to 25 .mu.m as measured by a particle counter in the polymer is not more than 50,000 per gram of the polymer.Type: GrantFiled: December 28, 1989Date of Patent: March 17, 1992Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Isao Sasaki, Kozi Nishida, Hisao Anzai
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Patent number: 5096968Abstract: A thermoplastic methacrylimide-containing polymer comprising 2 to 100% by weight of structural units represented by the following formula (I): ##STR1## wherein R is hydrogen or a hydrocarbon group having 1 to 20 carbon atoms, and 0 to 98% by weight of structural units derived from an ethylenically unsaturated monomer, wherein the content of iron in the polymer is not larger than 20 ppm and the difference between the maximum value and minimum value of the degree of imidization is preferably not larger than 5% by weight. This methacrylimide-containing polymer is used alone or as a blend thereof with another thermoplastic polymer.Type: GrantFiled: December 28, 1989Date of Patent: March 17, 1992Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Isao Sasaki, Kozi Nishida, Hisao Anzai, Masaharu Fujimoto
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Patent number: 5093417Abstract: A high-impact resin is prepared from a combination of (A) a polyphenylene ether, (B) a styrene polymer and (C) a rubbery elastomer composition having a particle diameter distribution, determined by the histogram method in units of 0.01 .mu.m, such that at least 80%, based on the number, of particles have a particle diameter of from 0.03 to 9 .mu.m and that the particle diameter distribution has two peak values: one of from 0.1 to 1 .mu.m and another of from 2 to 8 .mu.m. The rubbery elastomer composition is a blend of 50-95 weight % of a rubbery elastomer having a particle diameter distribution such that a peak occurs in the range of 0.1 to 1 .mu.m, with a rubbery elastomer having a particle diameter distribution such that a peak occurs in the range of 2 to 8 .mu.m.Type: GrantFiled: February 2, 1990Date of Patent: March 3, 1992Assignee: Mitsubishi Rayon Company Ltd.Inventors: Isao Sasaki, Naoki Yamamoto, Akira Yanagase, Masakazu Ito
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Patent number: 5073606Abstract: A methacrylimide containing polymer which is a thermoplastic polymer comprising from 2% to 100% by weight of a structural unit represented by the general formula: ##STR1## where R represents a hydrogen atom or an aliphatic group, aromatic group or cycloaliphatic hydrocarbon group with 1 to 20 carbon atoms and from 0 to 98% by weight of a structural unit derived from as ethylenic monomer, the polymer having(a) a molecular weight (Mw) of greater than 50,000 and less than 200,000 as measured by GPC, and(b) an amount of amide segments in the polymer of less than 5% by weight. The methacrylimide containing polymer has excellent transparency and heat resistance, as well as a low yellowness and aging coloration under heating.Type: GrantFiled: April 15, 1991Date of Patent: December 17, 1991Assignee: Mitsubishi Rayon Company, LimitedInventors: Isao Sasaki, Kozi Nishida, Hisao Anzai
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Patent number: 5064911Abstract: A methacrylimide containing polymer which is a thermoplastic polymer comprising from 2 to 100% by weight of a structural unit represented by the general formula: ##STR1## where R represents a hydrogen atom or an aliphatic group, aromatic group or cycloaliphatic hydrocarbon group with 1 to 20 carbon atoms and from 0 to 98% by weight of a structural unit derived from as ethylenic monomer, the polymer having(a) a molecular weight (Mw) of greater than 50,000 and less than 200,000 as measured by GPC, and(b) an amount of amide segments in the polymer of less than 5% by weight. The methacrylimide containing polymer has excellent transparency and heat resistance, as well as a low yellowness and aging coloration under heating.Type: GrantFiled: October 2, 1990Date of Patent: November 12, 1991Assignee: Mitsubishi Rayon Company, LimitedInventors: Isao Sasaki, Kozi Nishida, Hisao Anzai
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Patent number: 5064529Abstract: A membrane filter testing apparatus uses a control circuit for increasing the pressure at the primary side of a membrane filter fixedly accommodated in a housing and wetted with a liquid, by a gas at a predetermined rate, and checking whether the pressure at the primary side of the membrane filter is within a specified judging range after lapse of a predetermined period of time.Type: GrantFiled: August 22, 1989Date of Patent: November 12, 1991Assignee: Fujisawa Pharmaceutical Co., Ltd.Inventors: Shigemitsu Hirayama, Takamichi Akashi, Akio Ikuta, Isao Sasaki, Hiroshi Fukuda
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Patent number: 5047442Abstract: A photopolymerizable composition comprising a vinylic compound, a sulfur-containing compound and an .alpha.-diketone is disclosed. The sulfur-containing compound may be a mercaptobenzoic acid or a polysulfide.Type: GrantFiled: August 2, 1988Date of Patent: September 10, 1991Assignee: Mitsubishi Rayon Company LimitedInventors: Isao Sasaki, Nobuhiro Mukai
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Patent number: 5040204Abstract: A cordess telephone apparatus with a paper reporting an incoming signal from a parent device or a radio telephone. When the parent device receives a calling signal from a subscriber's line or when a switch is operated at the parent device or the radio telephone, the pager is started by a signal delivered via a radio circuit from the parent device or the radio telephone. The pager is mounted removably on the radio telephone.Type: GrantFiled: October 2, 1987Date of Patent: August 13, 1991Assignee: Kabushiki Kaisha ToshibaInventors: Isao Sasaki, Koichi Ito
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Patent number: 5023302Abstract: A methacrylimide group-containing polymer having good optical characteristics, especially a resistance to coloration under heating and above to retain good light-transmitting characteristics for a long time even at a high temperature, is prepared by polymerizing methacrylic acid, a methacrylic acid ester, or a monomer mixture predominantly comprised of methacrylic acid or an ester thereof in the absence of a mercaptan chain transfer agent, and then imidizing the thus-prepared polymer. The resulting polymer is useful as the core component of a light-transmitting fiber having a core-sheath structure.Type: GrantFiled: August 28, 1989Date of Patent: June 11, 1991Assignee: Mitsubishi Rayon Company, Ltd.Inventors: Hisao Anzai, Isao Sasaki, Kozi Nishida, Hideaki Makino, Masami Ohtani, Katsuhiko Shimada
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Patent number: 5011887Abstract: A thermoplastic resin composition superior in heat stability and impact resistance, which comprises 95-5% by weight of a thermoplastic polymer (A) selected from homopolymers and copolymers of ethylenic unsaturated monomers or from polymers of bifunctionally reactive compounds and 5-95% by weight of a compound-rubber-based graft copolymer which is produced by the graft polymerization of one or more vinyl monomers onto compound rubber particles having an average diameter of 0.08-0.6 .mu.m and structures in which 10-90% by weight of a polyorganosiloxane rubber component and 90-10% by weight of a polyalkyl(meth)acrylate rubber component are tangled together so as not to be separable from each other.Type: GrantFiled: March 8, 1989Date of Patent: April 30, 1991Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Isao Sasaki, Naoki Yamamoto, Akira Yanagase
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Patent number: 4994523Abstract: An impact-resistant resin composition having excellent impact resistance, weather resistance, surface appearance and wear characteristics is disclosed.The resin composition comprises:(A) a compound rubber type graft copolymer wherein at least one vinyl monomers is graft-polymerized onto a compound rubber that has an average particle diameter of 0.08 to 0.6 .mu.m and possesses such a structure that 10 to 90 wt. % of a polyorganosiloxane rubber component and 10 to 90 wt. % of a polyalkyl (meth)acrylate rubber component are entangled in an inseparable fashion, and the total amount of the polyorganosiloxane rubber component and the polyalkyl (meth)arcylate rubber component is 100 wt. %; and(B) a vinyl polymer obtained by polymerizing 70 to 100 wt. % of at least one vinyl monomer selected from the group consisting of aromatic alkenyl compounds, vinyl cyanide compounds, and alkyl (meth)acrylates with 0 to 30 wt. % of other vinyl monomer copolymerizable with them.Type: GrantFiled: January 23, 1989Date of Patent: February 19, 1991Assignee: Mitsubishi Rayon Company LimitedInventors: Isao Sasaki, Naoki Yamamoto, Akira Yanagase
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Patent number: 4994522Abstract: A vinyl chloride resin composition having excellent impact resistance even at a low temperature and good weather resistance is disclosed. Such vinyl chloride resin composition comprises:(A) a vinyl chloride resin, and(B) a compound rubber type graft copolymer wherein one or more vinyl monomers are graft-polymerized onto a compound rubber that has an average particle diameter of 0.08 to 0.6 .mu.m and possesses such a structure that 1 to 99 wt. % of a polyorganosiloxane rubber component and 1 to 990 wt. % of a polyalkyl (meth)acrylate rubber component are entangled in an inseparable fashion, and the total amount of the polyorganosiloxane rubber component and the polyalkyl (meth)acrylate rubber component is 100 wt. %.Type: GrantFiled: January 23, 1989Date of Patent: February 19, 1991Assignee: Mitsubishi Rayon Company LimitedInventors: Isao Sasaki, Naoki Yamamoto, Akira Yanagase
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Patent number: 4989947Abstract: A core-clad plastic optical fiber is described, comprising a polyglutarimide series polymer having a polymeric structural unit represented by formula (I) ##STR1## wherein R represents a hydrogen atom, an alkyl group, a cycloalkyl group, or an aromatic group and n represents a positive integer,having a thermal deformation temperture of at least 120.degree. C. as a core, and an organic polymer having a refractive index lower than the refractive index of the core as a clad layer, said plastic optical fiber having the characteristic that the light transmission loss measured at 655 nm is not more than 500 dB/km.Type: GrantFiled: January 10, 1989Date of Patent: February 5, 1991Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Isao Sasaki, Kozi Nishida, Masaru Morimoto, Hisao Anzai, Hideaki Makino
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Patent number: 4980418Abstract: Disclosed are thermoplastic resins comprising block copolymers composed of polyester segments and vinyl polymer segments and having excellent thermal resistance and moldability, as well as several processes for preparing same. Among these thermoplastic resins, block copolymers formed of amorphous aromatic polyester segments and polystyrene resin segments are also useful as optical resins.Type: GrantFiled: June 26, 1989Date of Patent: December 25, 1990Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Isao Sasaki, Naoki Yamamoto, Hiroshi Mori, Akira Nakata
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Patent number: 4977197Abstract: A photopolymerizable dental composition, which comprises:(A) an organic composite filler obtained by polymerizing at least one carboxylic acid monomer of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom, a C.sub.1 -C.sub.15 alkyl group, a --COOY group, a halogen atom, or a phenyl group or a derivative thereof; R.sub.2 is a hydrogen atom, a C.sub.1 -C.sub.15 alkyl group, a --COOZ group, a halogen atom, or a phenyl group or a derivative thereof; R.sub.3 is a hydrogen atom, a C.sub.1 -C.sub.15 alkyl group, a halogen atom, or a phenyl group or a derivative thereof; and each of X, Y and Z is a hydrogen atom, NH.sub.4 or an alkali metal atom; or the formula: ##STR2## wherein each of R.sub.4 and R.sub.5 is a hydrogen atom, a C.sub.1 -C.sub.Type: GrantFiled: May 12, 1988Date of Patent: December 11, 1990Assignee: Mitsubishi Rayon Company LimitedInventors: Isao Sasaki, Nobuhiro Mukai, Hitoshi Ige
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Patent number: H1004Abstract: A thermoplastic resin composition comprising:(A) 1-99 parts by weight of polymethacrylimide and(B) 99-1 parts by weight of ethylene-ethyl acrylate copolymer, polyamide-imide, polyether-ether ketone, or polyether sulfone. The thermoplastic resin composition has a high impact strength as well as good processability.Type: GrantFiled: July 18, 1989Date of Patent: December 3, 1991Assignee: Mitsubishi Rayon Company LimitedInventors: Isao Sasaki, Kozi Nishida, Hisao Anzai
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Patent number: H1042Abstract: Disclosed herein are thermoplastic resin compositions. They contain, a principal components, (A) a methacrylimide-containing polymer containing at least 10% by weight of methacrylimide units represented by the following formula (1): ##STR1## wherein R represents a hydrogen atom or an aliphatic, aromatic or alicyclic hydrocarbon group having 1-20 carbon atoms, and (B) at least one polymer selected from the group consisting of (B-1) chlorinated polyolefins and (B-2) thermoplastic polyurethanes.Type: GrantFiled: November 3, 1989Date of Patent: April 7, 1992Inventors: Isao Sasaki, Kozi Nishida, Masaharu Fujimoto