Patents by Inventor Yukitaka Goto
Yukitaka Goto 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: 6448356Abstract: An ethylene-&agr;-olefin copolymer which is a copolymer of ethylene with a C3-20 &agr;-olefin and which satisfies the following conditions (a) to (c): (a) the density (D) is from 0.850 to 0.950 g/cm3, (b) the relation between the melt tension (MT) and the melt flow rate (MFR) at 190° C. satisfies the following formula (1): log(MT)≧−0.91×log(MFR)+0.06 (1), and (c) the following three formulae (2), (3) and (4) are satisfied: Tmax≦972D−813 (2) logW60≦−0.114 Tmax+9.48 (3) logW90≧0.0394 Tmax−2.95 (4) where D is the density, Tmax is the elution peak temperature (°C.) by the cross fractionation measurement, W60 is the weight percentage (wt %) of a soluble content at 60° C. or lower, and W90 is the weight percentage (wt %) of a soluble content at 90° C. or higher.Type: GrantFiled: August 20, 2001Date of Patent: September 10, 2002Assignee: Mitsubishi Chemical CorporationInventors: Yumito Uehara, Yoshiyuki Ishihama, Yukitaka Goto
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Publication number: 20020035227Abstract: An ethylene-&agr;-olefin copolymer which is a copolymer of ethylene with a C3-20 &agr;-olefin and which satisfies the following conditions (a) to (c):Type: ApplicationFiled: August 20, 2001Publication date: March 21, 2002Applicant: Mitsubishi Chemical CorporationInventors: Yumito Uehara, Yoshiyuki Ishihama, Yukitaka Goto
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Patent number: 5693719Abstract: An ethylene polymer which is useful for molding inflation film having a particularly excellent moldability is provided.The ethylene polymer is obtainable by the first and second steps and satisfying the following conditions (a) to (d):(a) the polymer produced in the first polymerization step having an weight average molecular weight (Mw,.sub.1) in the range of 6.times.10.sup.5 to 4.times.10.sup.6 ;(b) the ratio (Mw,.sub.2 /Mw,.sub.1) of the weight average molecular weight of the polymer produced in the first polymerization step (Mw,.sub.1) and the weight average molecular weight of the polymer produced in the second polymerization step (Mw,.sub.2) being in the range of 0.7 to 1.4;(c) the molecular weight in which the integration fraction from the low molecular weight is equal to 1/2 of the weight fraction (W.sub.2) of the polymer produced in the second polymerization step being in the range of 5.times.10.sup.3 to 3.times.10.sup.4 ; and(d) the weight fraction (W.sub.Type: GrantFiled: December 15, 1995Date of Patent: December 2, 1997Assignee: Mitsubishi Chemical CorporationInventors: Yukitaka Goto, Nobuaki Sakurai, Tadashi Takahashi, Katsumi Hirakawa, Yoichi Maeda, Yoshihiko Sasaki, Satoshi Nishimura, Masataka Souda
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Patent number: 5374677Abstract: A thermoplastic polymer composition comprising: (i) 100 parts by weight of a thermoplastic polymer component which comprises an ethylene-propylene rubber, an ethylene copolymer and a propylene polymer (including an ethylene-propylene block copolymer), and (ii) 0 to 7 parts by weight of talc, the thermoplastic polymer component being composed of, according to fractionation using o-dichlorobenzene as a solvent, component (A) which is a component soluble in the solvent at 40.degree. C., component (B) which is a component insoluble in the solvent at 40.degree. C. but soluble at 110.degree. C., and component (C) which is a component insoluble in the solvent even at 110.degree. C. in such a proportion that the total amount of the components (A) and (B) is from 50 to 70 parts by weight, the weight ratio of the component (A) to the component (B) being from 0.5 to 1.5, and the amount of the component (C) is from 50 to 30 parts by weight.Type: GrantFiled: June 19, 1992Date of Patent: December 20, 1994Assignees: Mitsubishi Petrochemical Company Limited, Toyota Jidosha Kabushiki KaishaInventors: Takeyoshi Nishio, Takao Nomura, Nobuya Kawamura, Hiroki Sato, Akihiko Uchikawa, Ikuo Tsutsumi, Yukitaka Goto
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Patent number: 5302653Abstract: A thermoplastic polymer composition comprising: (i) 100 parts by weight of a thermoplastic polymer component which comprises an ethylene-propylene rubber, an ethylene copolymer and a propylene polymer (including an ethylene-propylene block copolymer), and (ii) 7 to 25 parts by weight of talc, the thermoplastic polymer component being composed of, according to fractionation using o-dichlorobenzene as a solvent, component (A) which is a component soluble in the solvent at 40.degree. C., component (B) which is a component insoluble in the solvent at 40.degree. C. but soluble at 110.degree. C., and component (C) which is a component insoluble in the solvent even at 110.degree. C. in such a proportion that the total amount of the components (A) and (B) is from 50 to 70 parts by weight, the weight ratio of the component (A) to the component (B) being from 0.5 to 1.5, and the amount of the component (C) is from 50 to 30 parts by weight; the composition having a flexural modulus of 10,000 to 20,000 kg/cm.sup.2.Type: GrantFiled: January 24, 1992Date of Patent: April 12, 1994Assignees: Mitsubishi Petrochemical Company Limited, Toyota Jidosha Kabushiki KaishaInventors: Takeyoshi Nishio, Nobuya Kawamura, Takao Nomura, Hiroki Sato, Akihiko Uchikawa, Ikuo Tsutsumi, Yukitaka Goto
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Patent number: 4992168Abstract: An apparatus for fractionally measuring a polymer comprising: a flow path change valve unit A having an inlet for pouring a sample polymer solution, a loop for metering the sample polymer solution, an internal standard solution pouring mechanism including a loop for metering the liquid and a valve for pouring the liquid, and a valve for changing the system flow path; a composition fractionation unit B which is provided with a column filled with a filler, and which permits the polymer dissolved in the sample polymer solution transferred from the loop for metering the sample polymer solution to precipitate on the filler, and then fractionally dissolves the polymer by stepwisely raising the temperature in the column; a molecular size fractionation unit C which is provided with a column filled with a filler, and which fractionates, depending upon the molecular size, the sample polymer fraction solution which has undergone composition fractionation in the unit B and which is batchwisely transferred therefrom; a soType: GrantFiled: March 3, 1989Date of Patent: February 12, 1991Assignee: Mitsubishi Petrochemical Company LimitedInventors: Shigeru Takayama, Yukitaka Goto
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Patent number: 3962157Abstract: A modified polyolefin composition having excellent physical properties such as bending rigidity, bending strength, impact strength, and the like can be prepared by melting and kneading a mixture of a radical generating agent such as benzoyl peroxide, a porous filler, and a polyolefin composed primarily of propylene and, if necessary, a polar vinyl monomer at a high temperature above the decomposition temperature of the radical generating agent.Type: GrantFiled: August 26, 1974Date of Patent: June 8, 1976Assignee: Mitsubishi Petrochemical Company LimitedInventors: Seikou Nakano, Yukitaka Goto, Takayuki Inoue