Patents by Inventor Tadatoshi Ogawa
Tadatoshi Ogawa 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: 6083629Abstract: A resin composition comprising 2 to 30 wt. parts of polyaminoamide and 98 to 70 wt. parts of a saponified ethylene-vinyl ester copolymer which comprises 20 to 60% of ethylene units based on the whole monomeric units and has a saponification degree for the vinyl ester units of at least 90%, and a shaped article comprising this resin composition.Type: GrantFiled: August 21, 1998Date of Patent: July 4, 2000Assignee: Sumitomo Chemical Company, LimitedInventors: Ryuma Kuroda, Taiichi Sakaya, Tadatoshi Ogawa
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Patent number: 5869573Abstract: A resin composition comprising 2 to 30 wt. parts of polyaminoamide and 98 to 70 wt. parts of a saponified ethylene-vinyl ester copolymer which comprises 20 to 60% of ethylene units based on the whole monomeric units and has a saponification degree for the vinyl ester units of at least 90%, and a shaped article comprising this resin composition.Type: GrantFiled: December 23, 1997Date of Patent: February 9, 1999Assignee: Sumitomo Chemical Company, LimitedInventors: Ryuma Kuroda, Taiichi Sakaya, Tadatoshi Ogawa
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Patent number: 5854326Abstract: A resin composition comprising 100 parts by weight of an aggregated inorganic layer compound and 200-10,000 parts by weight of a resin, the particle size of the aggregated inorganic layer compound satisfying the mathematical expressions (1):5<D/L and 1 .mu.m<D<1,000 .mu.Type: GrantFiled: August 28, 1996Date of Patent: December 29, 1998Assignee: Sumitomo Chemical Company, LimitedInventors: Taiichi Sakaya, Ryuma Kuroda, Tadatoshi Ogawa
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Patent number: 5721187Abstract: An oxygen absorber comprising an active carbon material layer and an oxygen absorbing layer comprising 15-80% by weight of a thermoplastic resin and 85-20% by weight of an oxygen absorbing agent, wherein the amount of the active carbon material is 0.2-15% by weight based on the oxygen absorbing agent. The oxygen absorber is easy to handle and excellent in oxygen absorbing performance, and does not deteriorate the flavor of foods and the like.Type: GrantFiled: December 27, 1995Date of Patent: February 24, 1998Assignee: Sumitomo Chemical Company, LimitedInventors: Tadatoshi Ogawa, Takanori Kume
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Patent number: 5462777Abstract: A wrapping multilayer film comprising at least 5 layers of(A) both the outermost layers each comprising an ethylene-.alpha.-olefin copolymer having an ethylene content of at least 50 mol %,(B) layers each comprising a propylene polymer and being disposed between the outermost layers (A), and(C) a layer comprising recycled resins and being disposed between the layers (B).Type: GrantFiled: June 28, 1994Date of Patent: October 31, 1995Assignees: Sumitomo Chemical Company, Limited, Kura Industrial Company, LimitedInventors: Haruo Hayashida, Akihiro Ichige, Tadatoshi Ogawa, Takeshi Yamada, Teruo Tada, Masaaki Zenigame, Toyoki Wano, Kazuo Kondo
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Patent number: 5115027Abstract: The polypropylene stretched film of the present invention is prepared by stretching a composition comprising a crystalline propylene polymer and 0.1 ppm by weight to 10% by weight of a nucleating agent, the composition having a melting point of 160.degree. C. or more, a crystallization temperature of 128.degree. C. or more and a 20.degree. C. xylene soluble portion of 3.0% by weight or less. The film has a high rigidity and a beautiful appearance as well as the characteristic properties inherent to crystalline propylene polymers. The film can be suitably used for food packaging and textile packaging.Type: GrantFiled: June 5, 1991Date of Patent: May 19, 1992Assignee: Sumitomo Chemical Company, LimitedInventors: Tadatoshi Ogawa, Seiichiro Ima, Kazuki Wakamatsu
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Patent number: 5032645Abstract: The polypropylene stretched film of the present invention is prepared by stretching a composition comprising a crystalline propylene polymer and 0.1 ppm by weight to 10% by weight of a nucleating agent, the composition having a melting point of 160.degree. C. or more, a crystallization temperature of 128.degree. C. or more and a 20.degree. C. xylene soluble portion of 3.0% by weight or less. The film has a high rigidity and a beautiful appearance as well as the characteristic properties inherent to crystalline propylene polymers. The film can be suitably used for food packaging and textile packaging.Type: GrantFiled: November 8, 1989Date of Patent: July 16, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Tadatoshi Ogawa, Seiichiro Ima, Kazuki Wakamatsu
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Patent number: 5019442Abstract: The overlay film of the invention is obtained by forming a substrate layer composed of a resin composition comprising an ethylene copolymer such as ethylene-methacrylic acid ester copolymer and the like and a crystalline polyolefin having a melting point of 110.degree. C. or higher on at least one side of the base layer composed of a crystalline polyolefin and the like by any method such as co-extrusion-laminating and the like followed by cooling. The overlay film is excellent in physical properties such as the anti-blocking property and the like and gives a metal-deposited film with brilliant appearance exhibiting high adhesive strength to the metal layer by vapor-deposition treatment. The metal-deposited film is serviceable for extensive uses including wrapping materials.Type: GrantFiled: July 25, 1989Date of Patent: May 28, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Tadatoshi Ogawa, Seiichiro Ima
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Patent number: 4948657Abstract: A multi-layer shrink film obtained by forming an assembly which comprises an interlayer comprising a flexible propylene resin having a Vicat softening point of 115.degree. C. or less and/or a linear very low-density polyethylene having a density less than 0.91 g/cm.sup.3 sandwiched between outermost layers comprising a propylene resin having a Vicat softening point higher than that of the flexible propylene resin of interlayer and within the range of 80.degree.-150.degree. C. followed by stretching said assembly is disclosed. The film obtained according to the present invention is well suited for a multi-layer shring packaging film and the like.Type: GrantFiled: February 25, 1988Date of Patent: August 14, 1990Assignee: Sumitomo Chemical Company, LimitedInventors: Tadatoshi Ogawa, Teruaki Yoshida
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Patent number: 4786562Abstract: A polypropylene multi-layer film which comprises a crystalline polypropylene substrate layer having laminated to at least one side thereof a sheet of a resin composition comprising:(A) 10-90% by weight of a propylene random copolymer satisfying that(i) the comonomer content is 4-15% by weight,(ii) the Vicat softening point is 122.degree. C. or less, and(iii) the cold xylene-soluble portion content is 15% by weight or less,(B) 10-90% by weight of a copolymer of propylene and an .alpha.-olefin having four or more carbon atoms or a copolymer of propylene, an .alpha.-olefin having four or more carbon atoms and ethylene satisfying that:(i) the content of the .alpha.-olefin having four or more carbon atoms is 8-35 mole %,(ii) the ethylene content is 5 mole % or less,(iii) the cold xylene-soluble portion content is 15-70% by weight, and(iv) the .DELTA.haze is 5% or less, and(C) 0-15% by weight of a highly crystalline polypropylene having a melting point of 150.degree. C. or more.Type: GrantFiled: July 2, 1987Date of Patent: November 22, 1988Assignee: Sumitomo Chemical Company, LimitedInventors: Masahiro Kakugo, Tadatoshi Ogawa, Seiichiro Ima, Teruaki Yoshida
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Patent number: 4766157Abstract: Foamed particles of propylene-type polymer of substantially non-crosslinked type, wherein the propylene-type polymer particles have a Melt Index of from 0.1 to 20, said polymer is at least one member selected from the group consisting of:(a) a soft polypropylene homopolymer having an <mmmm> partial rate of a stereoregular pentad partial rate by .sup.13 C-NMR Spectrum of from 45 to 85% and a fusion heat quantity of from 5 to 22 cal/g; and(b) a random copolymer of propylene and an .alpha.-olefin having a carbon number of 4 or more, or a random copolymer of propylene, an .alpha.-olefin having a carbon number of 4 or more, and ethylene, in which the content of the .alpha.-olefin having a carbon number of 4 or more is from 7 to 30 mol %, the content of ethylene is 5 mol % or less, and the cold xylene-soluble matter of said copolymer is from 15 to 60 wt %, said polymer particles being foamed with the use of an evaporation type blowing agent.Type: GrantFiled: December 16, 1986Date of Patent: August 23, 1988Assignee: Sumitomo Chemical Company, LimitedInventors: Hideaki Yamada, Satoru Hosoda, Tadatoshi Ogawa
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Patent number: 4761462Abstract: A packaging transparent propylene copolymer film stretched in at least one direction, which consists of a copolymer of propylene and an .alpha.-olefin having 4 or more carbon atoms or a copolymer of propylene, an .alpha.-olefin having 4 or more carbon atoms and ethylene. The copolymer satisfies the following conditions;(1) the content of the .alpha.-olefin having 4 or more carbon atoms in the copolymer is 8-25 mole %,(2) the content of ethylene in the copolymer is 5 mole % or less,(3) the content of a cold xylene-soluble portion in the copolymer is 15-50% by weight, and(4) the flexural modulus of the copolymer is 2,500-7,000 kg/cm.sup.2.Type: GrantFiled: December 30, 1985Date of Patent: August 2, 1988Assignee: Sumitomo Chemical Company, LimitedInventors: Shuji Kitamura, Kiyohiko Nakae, Tadatoshi Ogawa, Teruaki Yoshida, Hajime Sadatoshi
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Patent number: 4675247Abstract: A laminated polypropylene film consisting of a crystalline polypropylene layer having laminated to at least one side thereof a copolymer layer, said copolymer being a random copolymer of propylene and an .alpha.-olefin having 4 or more carbon atoms or a random copolymer of propylene, an .alpha.-olefin having 4 or more carbon atoms and ethylene obtained by vapor phase polymerization in the substantial absence of a liquid medium and satisfying the following conditions (1) to (4):(1) the content of an .alpha.-olefin having 4 or more carbon atoms in the copolymer is 8 to 25 mole %,(2) the content of ethylene in the copolymer is 3 mole % or less,(3) the content of a cold xylene-soluble portion in the copolymer is 15 to 60% by weight, and(4) the content of a boiling n-heptane-insoluble portion in the copolymer is 7% by weight or more. Said laminated film has an excellent low-temperature heat-sealability, an excellent transparency, a low blocking and a good scratch resistance.Type: GrantFiled: December 24, 1984Date of Patent: June 23, 1987Assignee: Sumitomo Chemical Company, LimitedInventors: Shuji Kitamura, Kiyohiko Nakae, Tadatoshi Ogawa, Teruaki Yoshida, Hajime Sadatoshi
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Patent number: 4670529Abstract: A packaging shrink film consisting essentially of a random copolymer of propylene and an .alpha.-olefin having 4 or more carbon atoms or a random copolymer of propylene, an .alpha.-olefin having 4 or more carbon atoms and ethylene, said random copolymer satisfying the following conditions:(1) the content of an .alpha.-olefin having 4 or more carbon atoms in the copolymer is 8 to 30 mole %,(2) the content of ethylene in the copolymer is 3 mole % or less,(3) the content of a cold xylene-soluble portion in the copolymer is 15 to 60% by weight, and(4) the content of a boiling n-heptane-insoluble portion in the copolymer is 7% by weight or more, said film having been stretched. The packaging shrink film is soft and excels in low-temperature shrink characteristics as well as in transparency and gloss.Type: GrantFiled: December 10, 1984Date of Patent: June 2, 1987Assignee: Sumitomo Chemical Company, LimitedInventors: Shuji Kitamura, Kiyohiko Nakae, Tadatoshi Ogawa, Teruaki Yoshida, Hajime Sadatoshi
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Patent number: 4438238Abstract: An ethylene-.alpha.-olefin copolymer composition comprising two ethylene-.alpha.-olefin copolymers which are different in density, intrinsic viscosity and the number of short chain branching per 1000 carbon atoms. Extrusion processed materials, injection molded materials and films obtained from said composition are excellent in strength.Type: GrantFiled: January 25, 1982Date of Patent: March 20, 1984Assignee: Sumitomo Chemical Company, LimitedInventors: Nobuo Fukushima, Shuji Kitamura, Kiyohiko Nakae, Tadatoshi Ogawa, Kozo Kotani, Hidekazu Hosono
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Patent number: 4248651Abstract: An improved thermoforming process for the production of formed articles of corrugated plastic board having small radius curvatures and deep drawings, which comprises heating said corrugated plastic board at the portions to be formed into small radius curvatures or deep drawings more intensively than at the other portions, and applying pressure to said portions thereby crushing the rib structure in said portions without crushing the rib structure in said other portions.Type: GrantFiled: October 27, 1976Date of Patent: February 3, 1981Assignee: Sumitomo Chemical Company, LimitedInventors: Susumu Kojimoto, Tadatoshi Ogawa, Youzou Abe