Patents by Inventor Tadao Yatsu
Tadao Yatsu 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: 5256363Abstract: Polyethylene terephthalates of the present invention are excellent in mechanical strength, heat resistance and transparency, and therefore blow molded containers molded from the present polyethylene terephthalate are excellent in high temperature filling properties when they are filled with juice, refrigerant beverage, carbonated beverage, seasonings, etc. Furthermore, the blow molded containers prepared from the present polyethylene terephthalates have such characteristic features that they are free from thermal deformation at the time when they are subjected to high temperature filling, they are readily subjected to sterilization treatment and hence excellent in high speed filling properties.Type: GrantFiled: December 4, 1992Date of Patent: October 26, 1993Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Mikio Hashimoto, Hiroji Niimi, Tadao Yatsu, Shigemi Shiraki
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Patent number: 5010146Abstract: In accordance with the present invention, there are provided polyester carbonate copolymers obtained by polymerization of a mixture of 20-80% by weight of an alkylene terephthalate oligomer [I] containing ethylene terephthalate as main structural units and having an intrinsic viscosity [.eta.], as measured at 25.degree. C. in o-chlorophenol, of less than 0.6 dl/g, and 20-80% by weight of a carbonate oligomer [II] containing 2,2-bis(4 -hydroxyphenyl)propane as main structural units and having an intrinsic viscosity [.eta.], as measured at 25.degree. C. in o-chlorophenol, of less than 0.6 dl/g, said copolymers having an intrinsic viscosity [.eta.], as measured at 25.degree. C. in o-chlorophenol, of 0.4-1.2 dl/g and a glass transition temperature (Tg) of 80.degree.-140.degree. C. with a single peak, and polyester resin compositions containing said copolymers, said resin composition being excellent in transparency, heat resistance and mechanical strength.Type: GrantFiled: June 14, 1989Date of Patent: April 23, 1991Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Masaki Kohsaka, Isaburou Higashi, Yoshinori Akana, Mikio Hashimoto, Tadao Yatsu
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Patent number: 4940616Abstract: Anti-gas permeation property and impact strength of a container such as a bottle which is made of polyethylene terephthalate resin by biaxially orienting blow molding are improved by using a multilayered structure of the polyethylene terephthalate and the other polyester of a dicarboxylic acid component containing a specific amount of isophthalic acid and a glycol component. The container is made preferably by preparing a preform which is a laminate of the polyethylene terephthalate and the other polyester in the molten state under pressure, and by biaxially orienting blow molding the preform.Type: GrantFiled: May 12, 1988Date of Patent: July 10, 1990Assignee: Mitsui Petrochemical IndustriesInventors: Tadao Yatsu, Nobuya Hinooka
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Patent number: 4874647Abstract: A transparent, heat resistant polyester composition having improved mechanical strength is provided, which comprises (A) 20 to 80% by weight of a polyalkylene terephthalate predominantly comprising ethylene terephthalate and having an intrinsic viscosity of from 0.6 to 1.2 dl/g, and (B) 20 to 80% by weight of a bisphenol-A polycarbonate having an intrinsic viscosity of from 0.6 to 1.2 dl/g, the composition having an intrinsic viscosity of from 0.6 to 1.2 dl/g and a single glass transition temperature of from 80.degree. to 130.degree. C. A polyester laminate may be molded as comprising a layer of the polyester composition and a layer of alkylene terephthalate. The molded polyester laminate can take any form including films and containers.Type: GrantFiled: November 28, 1988Date of Patent: October 17, 1989Assignee: Mitsui Petrochemical Industries, Inc.Inventors: Tadao Yatsu, Yoshinori Akana
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Patent number: 4731433Abstract: An aromatic copolyester comprising substantially equimolar proportions of [A] units derived from an aromatic dicarboxylic acid having 8 to 16 carbon atoms, and [B] units derived from an aromatic diol component; characterized in that(I) the diol component [B] is composed of 20 to 95 mole %, based on the total moles of compounds (a) and (b) below, of(a) a bisphenol compound represented by the formula ##STR1## wherein X represents a direct bond, or a divalent group selected from the class consisting of C.sub.1 -C.sub.8 alkylidene groups, O, S, SO, SO.sub.2 and CO, and(b) 5 to 80 mole %, based on the total moles of the compounds (a) and (b), of a compound selected from the group consisting of a specific divalent phenolic compound, and(II) the aromatic copolyester has an intrinsic viscosity [.eta.], determined at 60.degree. C. in pentafluorophenol, of at least 0.4 dl/g.Type: GrantFiled: August 2, 1985Date of Patent: March 15, 1988Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Tadao Yatsu, Takayuki Nakano, Toshiki Sotoyama
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Patent number: 4692506Abstract: A five-component copolyester not described in the prior art literature which comprises at least five components, i.e. (a) two aromatic dicarboxylic acid components composed of a major amount of an isophthalic acid component and a minor amount of another dicarboxylic acid component, (b) a diol component composed of an ethylene glycol component and optionally another diol component, (c) an aromatic monohydroxy-monocarboxylic acid component and (d) a polyfunctional compound component having at least three functional groups. The copolyester has excellent melt moldability, mechanical strength, transparency and gas-barrier property in a well balanced combination, and shows improved properties over conventional copolyesters containing a major amount of isophthalic acid as a dicarboxylic acid component.Type: GrantFiled: July 23, 1986Date of Patent: September 8, 1987Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Tadao Yatsu, Takayuki Nakano, Nobuya Hinooka, Tatsuo Kato
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Patent number: 4675373Abstract: A substantially linear polyhydroxy polyether, which (1) is composed substantially of aromatic units and aliphatic units, the proportion of the aromatic units being 50 to 98 mole % based on the total amount of the aromatic units and the aliphatic units, (2) has an intrinsic viscosity, measured at 25.degree. C. in o-chlorophenol, of from 0.3 to 2 dl/g, and (3) has a glass transition, temperature of from 30.degree. to 120.degree. C. Two processes for preparing the polyhydroxy polyether are proposed. The polyhydroxy polyether is useful in applications which require gas-barrier property.Type: GrantFiled: April 16, 1986Date of Patent: June 23, 1987Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Tadao Yatsu, Etsuji Ishimaru, Kimiyoshi Miura
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Patent number: 4622268Abstract: A five-component copolyester not described in the prior art literature which comprises at least five components, i.e. (a) two aromatic dicarboxylic acid components composed of a major amount of an isophthalic acid component and a minor amount of another dicarboxylic acid component, (b) a diol component composed of an ethylene glycol component and optionally another diol component, (c) an aromatic monohydroxy-monocarboxylic acid component and (d) a polyfunctional compound component having at least three functional groups. The copolyester has excellent melt moldability, mechanical strength, transparency and gas-barrier property in a well balanced combination, and shows improved properties over conventional copolyesters containing a major amount of isophthalic acid as a dicarboxylic acid component.Type: GrantFiled: November 27, 1984Date of Patent: November 11, 1986Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Tadao Yatsu, Takayuki Nakano, Nobuya Hinooka, Tatsuo Kato
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Patent number: 4618386Abstract: Anti-gas permeation property and impact strength of a container such as a bottle which is made of polyethylene terephthalate resin by biaxially orienting blow molding are improved by using a multilayered structure of the polyethylene terephthalate and the other polyester of a dicarboxylic acid component containing a specific amount of isophthalic acid and a glycol component. The container is made preferably by preparing a preform which is a laminate of the polyethylene terephthalate and the other polyester in the molten state under pressure, and by biaxially orienting blow molding the preform.Type: GrantFiled: July 8, 1985Date of Patent: October 21, 1986Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Tadao Yatsu, Nobuya Hinooka
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Patent number: 4390683Abstract: A monoaxially or biaxially stretched film structure, or a heat-set structure thereof, of an unstretched film of an aromatic polyester of the poly-1,3-phenylene terephthalate type, said aromatic polyester having an intrinsic viscosity, determined in p-chlorophenol at 50.degree. C., of 0.4 to 2.0 and being composed of [A] polybasic carboxylic acid component units consisting of terephthalic acid units (a.sub.1) and units (a.sub.2) of a polybasic carboxylic acid other than terephthalic acid, the proportion of the units (a.sub.2) being up to 25 mole % based on the units (a.sub.1) and units (a.sub.2) combined, and [B] polyol component units consisting of resorcinol units (b.sub.1) and units (b.sub.2) of a polyol other than resorcinol, the proportion of the units (b.sub.2) being up to 25 mole % based on the units (b.sub.1) and (b.sub.2) combined.Type: GrantFiled: October 6, 1981Date of Patent: June 28, 1983Assignee: Mitsui Petrochemical Industries Ltd.Inventors: Tadao Yatsu, Akira Todo, Toshiki Sotoyama
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Patent number: 4144388Abstract: A film-forming and thermocurable vinyl alcohol-substituted acrylamide copolymer consisting essentially of(1) 0 to 20 mole% of a unit of the formula ##STR1## wherein R represents a group selected from the class consisting of alkyl groups with 1 to 7 carbon atoms and aryl groups with 6 to 7 carbon atoms, and n is 0 or 1,(2) 30 to 70 mole% of a unit of the formula ##STR2## wherein n is as defined above, (3) 0 TO 20 MOLE% OF A UNIT OF THE FORMULA ##STR3## wherein R' represents a hydrogen atom or a lower alkyl group, and R is as defined above, and(4) 30 to 70 mole% of a unit of the formula ##STR4## wherein R' is as defined above, R" represents a group selected from the class consisting of alkyl groups with 1 to 18 carbon atoms, cycloalkyl groups with 5 to 6 carbon atoms, hydroxyalkyl groups with 2 to 4 carbon atoms and aryl groups with 6 to 7 carbon atoms, and R"' represents a group selected from the class consisting of a hydrogen atom and the group R",the amount of each unit being based on the total amount in molType: GrantFiled: December 12, 1977Date of Patent: March 13, 1979Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Tadao Yatsu, Isaburo Higashi
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Patent number: 4107418Abstract: An improved process for copolymerizing the monomers (a) at least one monomer selected from the group consisting of monoolefins, non-conjugated polyenes, conjugated polyenes, haloolefins, unsaturated esters of carboxylic acids and unsaturated ethers and (b) an acrylic monomer under slurry polymerization conditions to give a copolymer containing the monomeric units (a) and (b) alternately connected to each other with good regularity which has a narrow molecular weight distribution and is not liable to gelling during its formation.Type: GrantFiled: September 13, 1976Date of Patent: August 15, 1978Assignee: Mitsui Petrochemical Industries Ltd.Inventors: Tadao Yatsu, Hiroshi Wakumoto