Patents by Inventor Tadaaki Nishiyama
Tadaaki Nishiyama 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: 6858676Abstract: The present invention relates to an olefin derived copolymer and a thermoplastic resin composition using the olefin derived copolymer satisfying the following (1) and (2): (1) tensile strength at break measured based on JIS K6251 is 2.0 or less MPa; and (2) tensile elongation at break EB (%) of a resin composition obtained satisfies the following relational expression (expression 1) and (expression 2), when blended with a polypropylene derived resin that has 20 degree C. xylene soluble component of not more than 20 wt %. R[3/5]?R[2/6]?0.15??(expression 1) S[2/6]??800??(expression 2) (R[3/5] and R[2/6] are obtained by the following methods: a curve is obtained by plotting tensile elongation at break EB (%) (based on JIS K6251) of resin composition taken as vertical axis, and weight part rate Pa of a content of an olefin derived copolymer contained in a resin composition taken as horizontal axis; a multiple regression curve in section regions of Pa=0.30-0.50 and Pa=0.20-0.Type: GrantFiled: July 21, 1999Date of Patent: February 22, 2005Assignee: Sumitomo Chemical Company, Ltd.Inventors: Hirofumi Johoji, Hidetake Hozumi, Atsuko Ogawa, Tadaaki Nishiyama
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Publication number: 20040097650Abstract: A thermoplastic elastomer composition comprising the following components (A) and (B), wherein a weight ratio of the component (A)/the component (B) is from 5/95 to 95/5:Type: ApplicationFiled: September 5, 2003Publication date: May 20, 2004Inventors: Atsuko Ogawa, Tadaaki Nishiyama, Hidetake Hozumi
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Patent number: 6632541Abstract: An olefin based copolymer composition having excellent weather resistance and excellent recycling properties having an olefin based copolymer obtained by copolymerizing two or more olefins, wherein the olefins are selected from the group consisting of ethylene, propylene and alpha olefins having 4 to 20 carbon atoms, and the total number of carbon atoms of the two or more selected olefins is 6 or more in combination with other component(s).Type: GrantFiled: February 10, 1999Date of Patent: October 14, 2003Assignee: Sumitomo Chemical Company, LimitedInventors: Hirofumi Johoji, Hidetake Hozumi, Tadaaki Nishiyama
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Publication number: 20030114596Abstract: A thermoplastic elastomer composition comprising 5 to 95 wt % of the following (A) and 5 to 95 wt % of the following (B), wherein the flowability index I according to a test for flow properties with a capillary rheometer is 1.Type: ApplicationFiled: September 13, 2002Publication date: June 19, 2003Applicant: Sumitomo Chemical Company, LimitedInventors: Katsunari Inagaki, Tadaaki Nishiyama
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Patent number: 6562907Abstract: There is provided an olefin polymer having an elastic recovery of from 70 to 100% defined by the following formula (1), Elastic recovery=stress-residual deformation recovery×100/stretch deformation (1) wherein the stress-residual deformation recovery and the stretch deformation are obtained from a 100% strain hysteresis curve of a resin composition comprising 70 parts by weight of the olefin polymer and 30 parts by weight of one specific propylene-ethylene copolymer resin, provided that at least one resin composition satisfies the above-defined value of elastic recovery.Type: GrantFiled: November 27, 2001Date of Patent: May 13, 2003Assignee: Sumitomo Chemical Company, LimitedInventors: Hirofumi Johoji, Hidetake Hozumi, Tadaaki Nishiyama
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Patent number: 6541592Abstract: A thermoplastic elastomer composition comprising 5 to 95 wt % of the following (A) and 5 to 95 wt % of the following (B), wherein the flowability index I according to a test for flow properties with a capillary rheometer is 1.35 or more: (A) an ethylene-&agr;-olefin copolymer having a tensile stress M100 measured according to JIS-K-6251 of 2.5 MPa or less, (B) a polyolefin-based resin having a tensile stress M100 measured according to JIS-K-6251 of 2.5 MPa or more.Type: GrantFiled: August 9, 2000Date of Patent: April 1, 2003Assignee: Sumitomo Chemical Company, LimitedInventors: Katsunari Inagaki, Tadaaki Nishiyama
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Patent number: 6525138Abstract: There is disclosed a thermoplastic resin composition comprising; (A) 5 to 95% by weight of a thermoplastic resin having a melt flow rate of from 0.001 to 100 g/10 min. and a die swell ratio of not less than 1.7, and (B) 95 to 5% by weight of an olefin polymer satisfying the following formula (1), Ua≦1.5×Sa×(Ta/100)3.3 (1) wherein (i) Ua is a flexural modulus of a resin opposition for evaluation composed of 50 parts by weight of said olefin polymer and 50 parts by weight of a specific homopolypropylene resin, (ii) Sa is a flexural modulus of said homopolypropylene resin, and (iii) Ta is a containing ratio of said homopolypropylene resin in the resin composition for evaluation, provided that the sum of the component (A) and the component (B) is 100% by weight.Type: GrantFiled: July 27, 2001Date of Patent: February 25, 2003Assignee: Sumitomo Chemical Company, LimitedInventors: Hirofumi Johoji, Hidetake Hozumi, Tadaaki Nishiyama
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Publication number: 20020120065Abstract: There is provided an olefin polymer having an elastic recovery of from 70 to 100% defined by the following formula (1),Type: ApplicationFiled: November 27, 2001Publication date: August 29, 2002Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Hirofumi Johoji, Hidetake Hozumi, Tadaaki Nishiyama
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Publication number: 20020072561Abstract: An olefin-based copolymer composition comprising the following component (a) in combination with any one component selected from the following components (b) to (i):Type: ApplicationFiled: February 10, 1999Publication date: June 13, 2002Inventors: HIROFUMI JOHOJI, HIDETAKE HOZUMI, TADAAKI NISHIYAMA
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Publication number: 20020055592Abstract: There is disclosed a thermoplastic resin composition comprising:Type: ApplicationFiled: July 27, 2001Publication date: May 9, 2002Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Hirofumi Johoji, Hidetake Hozumi, Tadaaki Nishiyama
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Patent number: 6288191Abstract: The present invention relates to an ethylene-isoprene random copolymer having an isoprene content of about 1 to 45% by mole, or an ethylene-isoprene copolymer having a Q-value of about 3.5 or less, wherein the Q-value is a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) The copolymer may be made using a catalyst comprising a compound of formula I, II or III, wherein M1 is a group IV transition metal, J is a group XIV atom, A and X3 are group XVI atoms, and Cp1 is a cyclopentadienyl-type group.Type: GrantFiled: March 3, 1999Date of Patent: September 11, 2001Assignee: Sumitomo Chemical Company, LimitedInventors: Tadaaki Nishiyama, Atsuko Ogawa
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Patent number: 6084046Abstract: A random copolymer comprising ethylene, an .alpha.-olefin and a branched conjugated polyvalent olefin, wherein (i) ethylene, the .alpha.-olefin and an iodine value respectively satisfy the following inequalities: 0<ethylene<100 (% by mol), 0<.alpha.-olefin<100 (% by mol) and 0<iodine value<370 (g/100 g), (ii) an intrinsic viscosity [.eta.] measured in decalin at 135.degree. C. of the random copolymer satisfies the following inequality: 0.1 (dl/g)<[.eta.]<10 (dl/g) and (iii) a molecular weight distribution (Mw/Mn).ltoreq.5.Type: GrantFiled: February 9, 1998Date of Patent: July 4, 2000Assignee: Sumitomo Chemical Company, LimtedInventors: Hirofumi Johoji, Tsuyoshi Takei, Tadaaki Nishiyama
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Patent number: 5610226Abstract: A composition is disclosed which contains about 80.0 to about 99.9% by weight of a (meth)acrylate monomer having a structure represented by a formula (I) or a mixture of the (meth)acrylate monomer and alkyl acrylate having an alkyl ester comprising alcohol of 1 to 8 carbon atoms, and about 20.0 to about 0.1% by weight of a crosslinking monomer copolymerizable with the (meth)acrylate monomer. The composition can be used in formulating elastomeric compositions having a favorable balance of properties.Type: GrantFiled: May 22, 1995Date of Patent: March 11, 1997Assignee: Sumitomo Chemical Company, LimitedInventors: Keisaku Yamamoto, Kiyoshi Ikeda, Masahiro Fukuyama, Tadaaki Nishiyama
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Patent number: 5516862Abstract: A process for producing ethylene-.alpha.-olefin copolymer rubbers which comprises mixing a vanadium compound-containing solution and an alcohol-containing solution with stirring for 10-600 seconds to obtain a mixed solution, immediately feeding the mixed solution into a polymerization vessel containing an organoaluminum compound, and copolymerizing ethylene and an .alpha.-olefin, or ethylene, an .alpha.-olefin and a non-conjugated diene compound in the polymerization vessel. According to this process, the activity of polymerization catalyst can be maintained at a high level, no by-product of the reaction of the vanadium compound and the alcohol is deposited as precipitate in the apparatus and no such additional operations as bubbling is necessary.Type: GrantFiled: September 7, 1994Date of Patent: May 14, 1996Assignee: Sumitomo Chemical Company, LimitedInventors: Keisaku Yamamoto, Kizuku Wakatsuki, Hayato Saba, Tadaaki Nishiyama