Patents by Inventor Komei Yamasaki
Komei Yamasaki 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: 5698652Abstract: A styrenic polymer having a highly syndiotactic configuration (SPS) is herein disclosed in which the weight-average molecular weight of the styrenic polymer is in the range of 1.times.10.sup.4 to 2.times.10.sup.6 and in which the weight fraction of an extract extracted with methylene chloride from a gel obtained by dissolving the styrenic polymer in 1,2,4-trichlorobenzene and then cooling the solution is 10% by weight or less, and a molded article comprising the SPS is also disclosed.Type: GrantFiled: July 24, 1996Date of Patent: December 16, 1997Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Takuma Aoyama, Takaaki Uchida, Akitoshi Masuyama, Komei Yamasaki
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Patent number: 5612452Abstract: The present invention relates to a process for efficiently purifying a styrenic polymer which comprises adding a poor solvent alone or in combination with a swelling agent to a syndiotactic polystyrene produced by the use of a catalyst comprising (A) an aluminoxane or a coordination complex compound comprising a cation and an anion in which a plurality of radicals are bonded to a metal and (B) a transition metal compound, and treating the polystyrene under a controlled water content of 15 to 10,000 ppm to simultaneously carry out deactivation and deashing. The above process can efficiently remove residual metals without using a deashing agent and afford a highly pure high-grade crystalline styrenic polymer excellent in color tone.Type: GrantFiled: January 4, 1996Date of Patent: March 18, 1997Assignee: Idemitsu Kosan Co., Ltd.Inventors: Hideo Teshima, Komei Yamasaki
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Patent number: 5518817Abstract: A resin laminate comprising layer of styrene-based polymer having mainly syndiotactic configuration and a thermoplastic resin layer, a metallized laminate comprising a layer of the styrene-based polymer described above and a metal layer, and process for producing these laminates are disclosed. In the laminate, the styrene-based polymer layer and the thermoplastic resin layer may be biaxially stretched.The laminates are expected to be utilized for electrostatic capacitors, hot stamping foils, flexible printed circuit board substrates, food wrapping films, and other functional films including magnetic tapes, and ornament films.Type: GrantFiled: July 11, 1994Date of Patent: May 21, 1996Assignee: Idemitsu Kosan Co, Ltd.Inventors: Komei Yamasaki, Keisuke Funaki
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Patent number: 5389431Abstract: There are disclosed a nonwoven fabric comprising fibrillated three-dimensional network fibers prepared by the use of a styrenic polymer having a high degree of syndiotactic configuration as the pricipal component and also a process for producing the above nonwoven fabric comprising flash-spinning a homogeneous solution containing a styrenic polymer having a high degree of syndiotactic configuration.The resultant nonwoven fabric is excellent in heat resistance, dimensional stability and solvent resistance.Type: GrantFiled: January 7, 1993Date of Patent: February 14, 1995Assignee: Idemitsu Kosan Co., Ltd.Inventor: Komei Yamasaki
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Patent number: 5373031Abstract: A styrene-based polymer molding is obtained molding a styrene-based polymer having mainly syndiotactic configuration and then irradiating the molding thus obtained with electron rays. This molding is excellent in heat resistance and further inexpensive. Thus the molding is useful as a material required to have high heat resistance, such as a structural material, a food container material, a food wrapping material or an electric or electronic part material, particularly as an electric or electronic part material, because it is excellent in soldering resistance.Type: GrantFiled: September 20, 1993Date of Patent: December 13, 1994Assignee: Idemitsu Kosan Co., Ltd.Inventors: Keisuke Funaki, Komei Yamasaki
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Patent number: 5357014Abstract: There are disclosed a styrenic resin molding having a high crystallinity and excellent in heat resistance, solvent resistance and transparency, and a process for producing the same. Specifically the present invention provides an orientable or thermoformable non-oriented styrenic resin molding having a crystallinity of 25% or more, a spherulite radius of 10 .mu.m or less and a haze of 5% or less and comprising a styrenic polymer having a high degree of syndiotactic configuration; a process for producing the above non-oriented molding; a transparent styrenic-resin molding having a crystallinity of 30% or more which is obtained by thermoforming or orienting the above non-oriented molding at an expansion ratio by area of 1.2 or more; and the process for producing the same.Type: GrantFiled: August 3, 1992Date of Patent: October 18, 1994Assignee: Idemitsu Kosan Co., Ltd.Inventors: Takaaki Uchida, Tomoaki Takebe, Keisuke Funaki, Komei Yamasaki
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Patent number: 5346950Abstract: A resin composition comprising 5 to 95 parts by weight of a saponified product of an ethylene-vinyl acetate copolymer (A) having an ethylene content of 20 to 60 mol % and a degree of saponification of at least 90% and 95 to 5 parts by weight of a styrene-based polymer (B) having mainly syndiotactic configuration. The resin composition has gas barrier properties and a markedly improved heat resistance.Type: GrantFiled: October 25, 1993Date of Patent: September 13, 1994Assignees: Kuraray Co., Ltd., Idemitsu Petrochemical Co., Ltd.Inventors: Taichi Negi, Akira Mochizuki, Shiro Nagata, Komei Yamasaki, Keisuke Funaki, Takashi Sumitomo
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Patent number: 5322869Abstract: Styrene-based resin composition containing as main components (A) 100 parts by weight of a styrene-based polymer having mainly a syndiotactic configuration and (B) 0.01 to 25 parts by weight of one or more nucleating agents selected from the group consisting of (1) metal salts of organic acids having an average particle diameter of not more than 50 .mu.m, (2) inorganic compounds having an average particle diameter of not more than 50 .mu.m, (3) organophosphorus compounds having an average particle diameter of not more than 50 .mu.m, and (4) metal salts of ionic hydrocarbon copolymer, and a process for producing styrene-based resin moldings by molding the above styrene-based resin composition at a temperature between room temperature and 200.degree. C. The resin composition of the present invention is suitable for injection molding and extrusion molding, and provides moldings which are of high crystallinity and are excellent in heat resistance, solvent resistance, chemical resistance and so forth.Type: GrantFiled: December 18, 1991Date of Patent: June 21, 1994Assignee: Idemitsu Kosan Co., Ltd.Inventors: Komei Yamasaki, Takashi Sumitomo, Toshikazu Ijitsu, Hiroshi Yamada, Toshihiro Furusawa
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Patent number: 5292587Abstract: Disclosed are a material for extrusion molding comprising a styrene-based polymer having a high degree of syndiotactic configuration, a melt viscosity of 10.sup.3 to less than 10.sup.6 poise measured at 300.degree. C. and a shearing rate of 10/sec, and a crystallinity of 15% or more, a process for preparation of the said material and a process for preparation of a molding product therefrom.The molding product prepared according to the present invention has excellent properties such as heat resistance and chemical resistance.Type: GrantFiled: August 17, 1992Date of Patent: March 8, 1994Assignee: Idemitsu Kosan Co., Ltd.Inventors: Keisuke Funaki, Komei Yamasaki
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Patent number: 5286762Abstract: A styrene-based polymer molding is obtained by molding a styrene-based polymer having mainly syndiotactic configuration and then irradiating the molding thus obtained with electron rays. This molding is excellent in heat resistance and further inexpensive. Thus the molding is useful as a material required to have high heat resistance, such as a structural material, a food container material, a food wrapping material or an electric or electronic part material, particularly as an electric or electronic part material, because it is excellent in soldering resistance.Type: GrantFiled: March 8, 1993Date of Patent: February 15, 1994Assignee: Idemitsu Kosan Company LimitedInventors: Keisuke Funaki, Komei Yamasaki
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Patent number: 5270353Abstract: Disclosed is a resin composition which comprises (a) 5 to 95% by weight of a styrene-based polymer having a syndiotactic configuration, (b) 95 to 9% by weight of a thermoplastic resin having at least one polar group selected from a carboxyl group, a hydroxyl group and an amino group at the terminal; and (c) 0.01 to 15 parts by weight of a styrene-based copolymer obtained by copolymerizing a styrene compound with a vinyl compound having an epoxy group or a styrene-based copolymer obtained by copolymerizing a styrene compound with an .alpha.,.beta.-unsaturated carboxylic acid anhydride based on 100 parts by weight of the aobve components (a) and (b). The composition exhibits no laminar peeling and has an excellent appearance because affinity and dispersibility of the styrene-based polymer and the thermoplastic resin are improved, and a polystyrene-based resin composition improved in mechanical strength can also be obtained without using a complicated process.Type: GrantFiled: October 18, 1991Date of Patent: December 14, 1993Assignee: Idemitsu Kosan Co., Ltd.Inventors: Akikazu Nakano, Takashi Sumitomo, Komei Yamasaki, Keisuke Funaki
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Patent number: 5183871Abstract: Disclosed are a styrene polymer molding material which has a high degree of syndiotacticity, a weight average molecular weight of 50,000 or more, and at least one melting points of 285.degree. C. or higher, and a process for producing the same by melting a styrene polymer having a high degree of syndioacticity and then molding it under a stress of 1.times.10.sup.6 dyne/cm.sup.2 or higher.The styrene polymer molding material of the present invention has excellent heat resistance. In addition, according to the process of the present invention, the above polymer molding material having excellent heat resistance can be prepared by a simple operation, and thus has marked advantages for practical use.Type: GrantFiled: May 14, 1990Date of Patent: February 2, 1993Assignee: Idemitsu Kosan Co., Ltd.Inventors: Komei Yamasaki, Funaki Keisuke
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Patent number: 5164479Abstract: Disclosed are a material for extrusion molding comprising a styrene-based polymer having a high degree of syndiotactic configuration, a melt viscosity of 10.sup.3 to less than 10.sup.6 poise measured at 300.degree. C. and a shearing rate of 10/sec, and a crystallinity of 15% or more, a process for preparation of the said material and a process for preparation of a molding product therefrom.The molding product prepared according to the present invention has excellent properties such as heat resistance and chemical resistance.Type: GrantFiled: January 16, 1990Date of Patent: November 17, 1992Assignee: Idemitsu Kosan Co., Ltd.Inventors: Keisuke Funaki, Komei Yamasaki
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Patent number: 5156797Abstract: Nonwoven fabrics are disclosed, which are produced by molding a material containing as a main component a styrene-based polymer with mainly syndiotactic configuration, in such a manner that a difference between the absolute value of heat of fusion .vertline..DELTA.Hf.vertline. and the absolute value of crystallizing enthalpy on heating .vertline..DELTA.Htcc.vertline. of the molded polymer is at least 1 cal/g. These nonwoven fabrics are excellent in heat-resistant and chemical-resistant characteristics, and are suitable for use as medical fabrics, industrial filters, battery separators and so forth.Type: GrantFiled: October 10, 1991Date of Patent: October 20, 1992Assignee: Idemitsu Kosan Co., Ltd.Inventors: Komei Yamasaki, Keisuke Funaki
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Method of storing food or plant materials by wrapping with a stretched syndiotactic polystyrene film
Patent number: 5145950Abstract: A method of wrapping plant materials for storage by wrapping the plant materials with a food wrapping material obtained by stretching a styrene-based polymer film with mainly syndiotactic configuration. The wrapping material is transparent, has gloss and is excellent in physical properties such as gas permeability and heat resistance making it very useful in the method for wrapping material such as vegetables and fruits requiring permeation and diffusion of gases such as oxygen and carbon dioxide.Type: GrantFiled: February 4, 1991Date of Patent: September 8, 1992Assignee: Idemitsu Kosan Co., Ltd.Inventors: Keisuke Funaki, Komei Yamasaki -
Patent number: 5109068Abstract: There is disclosed a styrene-based polymer composition which comprises(A) 10 to 98% by weight of a styrene-based polymer having syndiotactic configuration with a racemic pentad of 30% or more and(B) 90 to 2% by weight of polyphenylene ether having an inrinsic viscosity of 0.28 dl/g or more at 30.degree. C. in chloroform.Also, a flame retarder, a flame-retardant aid, a rubber-like elastomer or an inorganic filler may optionally be added to the composition.Further, also disclosed is a stretched molding comprising stretching the above composition.Type: GrantFiled: August 2, 1989Date of Patent: April 28, 1992Assignee: Idemitsu Kosan Co., Ltd.Inventors: Komei Yamasaki, Keisuke Funaki, Akikazu Nakano, Takashi Sumitomo
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Patent number: 5089353Abstract: A multi-layer material with a layer (A) of a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol % and a degree of saponification of at least 90% and a layer (B) of a styrene-based polymer having mainly syndiotactic configuration, or a resin composition comprising 5 to 95 parts by weight of a saponified product of an ethylene-vinyl acetate copolymer (A) having an ethylene content of 20 to 60 mol % and a degreee of saponification of at least 90% and 95 to 5 parts by weight of a styrene-based polymer (B) having mainly syndiotactic configuration has gas barrier properties and markedly improved heat resistance.In a molding comprising the resin composition or the multi-layer material, contents (food) can be stored for a long period of time at ambient temperature. Moreover, after retort sterilization, the container can be heated by boiling, or in a microwave oven or a grill oven (at 220 to 240.degree. C.Type: GrantFiled: September 28, 1989Date of Patent: February 18, 1992Assignees: Kuraray Co., Ltd., Idemitsu Petrochemical Co., Ltd.Inventors: Taichi Negi, Akira Mochizuki, Shiro Nagata, Komei Yamasaki, Keisuke Funaki, Takashi Sumitomo
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Patent number: 5079075Abstract: Nonwoven fabrics are disclosed, which are produced by molding a material containing as a main component a styrene-based polymer with mainly syndiotactic configuration, in such a manner that a difference between the absolute value of heat of fusion .vertline..DELTA.Hf.vertline. and the absolute value of crystallizing enthalpy on heating .vertline..DELTA.Htcc.vertline. of the molded polymer is at least 1 cal/g. These nonwoven fabrics are excellent in heat-resistant and chemical-resistant characteristics, and are suitable for use as medical fabrics, industrial filters, battery separators and so forth.Type: GrantFiled: June 1, 1989Date of Patent: January 7, 1992Assignee: Idemitsu Kosan Co., Ltd.Inventors: Komei Yamasaki, Keisuke Funaki
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Patent number: 5030506Abstract: The present invention is directed to a polyolefin type resin laminate that comprises a base layer made of a polyolefin type resin consisting mainly of butene-1 type polymer in which the content of other .alpha.-olefin unit of 15 mol % or below, the intrinsic viscosity [.eta.] is 1.2 to 4.0 dl/g, the ratio Mw/Mn of the weight-average molecular weight [Mw] to the number-average molecular weight [Mn] is from 2 to 10, and the haze is 50% or below, and layers each provided on each of the opposite surfaces of said base layer and made of a polyolefin type resin having a melt index [MI] of 0.1 to 30 g/10 min, the haze of each of the latter layers being up to that of said base layer, characterized in that the haze of said laminate is 3% or below, the strain recovery rate is 90% or over and the ratio of the tear strength in the M. D. to the tear strngth in the T. D. is from 0.25 to 4.Type: GrantFiled: December 22, 1988Date of Patent: July 9, 1991Assignees: Idemitsu Petrochemical Company Ltd., Neste OyInventors: Takashi Yamawaki, Komei Yamasaki
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Patent number: 5004649Abstract: A resin laminate comprising a layer of styrene-based polymer having mainly syndiotactic configuration and a thermoplastic resin layer, a metallized laminate comprising a layer of the styrene-based polymer described above and a metal layer, and process for producing these laminates are disclosed. In the laminate, the styrene-based polymer layer and the thermoplastic resin layer may be biaxially stretched.The laminates are expected to be utilized for electrostatic capacitors, hot stamping foils, flexible printed circuit board substrates, food wrapping films, and other functional films including magnetic tapes, and ornament films.Type: GrantFiled: March 23, 1989Date of Patent: April 2, 1991Assignee: Idemitsu Kosan Co., Ltd.Inventors: Komei Yamasaki, Keisuke Funaki