Patents by Inventor Keiichi Kanaka
Keiichi Kanaka 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: 7087704Abstract: It is an object of the present invention to manufacture high quality thermotropic liquid-crystalline polymer generating no low boiling gas and inducing no discoloration resulted from thermal degradation at high yield. To manufacture a liquid-crystalline polymer having 50 mol % or larger ratio of constitutive unit introduced from 4-hydroxybenzoic acid, the reaction is conducted under the presence of an acylating agent and of a catalyst quantity of aromatic sulfonic acid.Type: GrantFiled: March 7, 2005Date of Patent: August 8, 2006Assignee: Polyplastics Co., Ltd.Inventors: Keiichi Kanaka, Shinya Yamada
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Patent number: 6956072Abstract: To provide a resin composition, in which a liquid crystal polymer is made into fiber in a molded article to exhibit an extremely high reinforcing effect which has not been available yet, and from which a molded article having an excellent mechanical strength can be manufactured in a stable manner. That is, a thermoplastic resin composition, wherein 100 parts by weight in total consisting of 99-50 parts by weight of a thermoplastic polyester resin (A) not forming an anisotropic molten phase and 1-50 parts by weight of a liquid crystal polymer (B) capable of forming an anisotropic molten phase is blended with 0.001-2.Type: GrantFiled: July 12, 2000Date of Patent: October 18, 2005Assignee: Polyplastics Co., Ltd.Inventors: Keiichi Kanaka, Toshio Shiwaku, Mineo Ohtake
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Publication number: 20050215754Abstract: It is an object of the present invention to manufacture high quality thermotrbpic liquid-crystalline polymer generating no low boiling gas and inducing no discoloration resulted from thermal degradation at high yield. To manufacture a liquid-crystalline polymer having 50 mol % or larger ratio of constitutive unit introduced from 4-hydroxybenzoic acid, the reaction is conducted under the presence of an acylating agent and of a catalyst quantity of aromatic sulfonic acid.Type: ApplicationFiled: March 7, 2005Publication date: September 29, 2005Applicant: Polyplastics Co., Ltd.Inventors: Keiichi Kanaka, Shinya Yamada
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Patent number: 6716367Abstract: A process for producing a liquid crystalline polymer with increased polymerization rate and reduced deposition of monomer-derived substances to the reaction vessel during production is provided. A liquid crystalline polymer having a constituent unit derived from 4-hydroxybenzoic acid in an amount 8 mol % or less is produced by conducting reaction at the presence of a catalytic amount of a catalyst comprising a potassium compound and a trivalent cobalt compound in combination.Type: GrantFiled: December 12, 2002Date of Patent: April 6, 2004Assignee: Polyplastics Co., Ltd.Inventors: Keiichi Kanaka, Katsutoshi Sakamoto
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Publication number: 20030127628Abstract: A process for producing a liquid crystalline polymer with increased polymerization rate and reduced deposition of monomer-derived substances to the reaction vessel during production is provided. A liquid crystalline polymer having a constituent unit derived from 4-hydroxybenzoic acid in an amount 8 mol % or less is produced by conducting reaction at the presence of a catalytic amount of a catalyst comprising a potassium compound and a trivalent cobalt compound in combination.Type: ApplicationFiled: December 12, 2002Publication date: July 10, 2003Inventors: Keiichi Kanaka, Katsutoshi Sakamoto
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Patent number: 5391689Abstract: A novel wholly aromatic polyester capable of forming an anisotropic melt phase is provided. Such polyester has been demonstrated to be capable of forming quality molded articles having a combination of excellent heat resistance and mechanical properties. The resulting polyester further is capable of readily being melt processed while using conventional equipment. Four essential recurring units are present in the polyester of the present invention wherein (I) is derived from 2,6-napthalenedicarboxylic acid and/or 4,4'-biphenyldicarboxylicacid; (II) is derived from another dicarboxylic acid (as defined) such as terephthalic acid; and (III) is derived from aromatic diols (as defined) such as 1,4-dihydroxybenzene and 4,4'-dihydroxybiphenyl; and (IV) is derived from another aromatic diol (as defined), such as 4,4'-dihydroxydiphenyl ether. In a preferred embodiment, an inorganic filler is dispersed therein.Type: GrantFiled: July 28, 1993Date of Patent: February 21, 1995Assignee: Polyplastics Co., Ltd.Inventors: Yukihiko Kageyama, Tatsuya Saito, Keiichi Kanaka, Kenji Hijikata
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Patent number: 5233016Abstract: Normally solid, melt-stable copolyester molding resins are formed of the polycondensation reaction product of(a) an aromatic dicarboxylic acid or an ester-forming derivative thereof, (b) an aliphatic dihydroxy compound which includes at least 35 mole % of of units derived from 1,4-cyclohexanedimethanol, and (c) a melt-stable effective amount between 0.1 to 35 mole %, based on the amount of the aromatic dicarboxylic acid, of an ester-forming diol compound of the following formula I:HO--R--O--A--O--R--OH (I)wherein A is a divalent organic radical having at least one aromatic ring, and R is a divalent organic radical selected from aliphatic hydrocarbon groups having 2 to 8 carbon atoms and polyoxyalkylene groups.Type: GrantFiled: December 27, 1991Date of Patent: August 3, 1993Assignee: Polyplastics Co., Ltd.Inventors: Keiichi Kanaka, Kenji Hijikata
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Patent number: 5232969Abstract: Novel moldable, highly stable, normally solid polyoxymethylene resin compositions and molded articles formed of the same include a stabilizing effective amount of an alkoxy-substituted phenoxy-containing compound having the formula (I) or (II):Ar.sup.1 --O--X (I)Ar.sup.2 (--O--X).sub.s (II)where Ar.sup.1 represents an aryl group having no hydroxyl groups directly bonded thereto as a substituent, Ar.sup.2 represents a benzene or naphthalene ring having no hydroxyl groups directly bonded thereto as a substituent, and s represents the number of alkoxy-derivative substituents. Preferably, Ar.sup.1 in formula (I) is a phenyl, biphenyl or naphthyl group, and Ar.sup.2 in formula (II) is benzene (with s being 2). Ar.sup.1 and Ar.sup.2 in formulas (I) and (II) may only be substituted with the --OX group, or may also contain other alkoxy group substituents.Type: GrantFiled: December 19, 1991Date of Patent: August 3, 1993Assignee: Polyplastics Co., Ltd.Inventors: Toshiro Murao, Kaoru Yamamoto, Keiichi Kanaka, Mitsuharu Kusagaya
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Patent number: 5221729Abstract: A polyester exhibiting melt anisotropy and improved thermal stability is provided which consists essentially of structural units represented by the formulas (i) to (iii), wherein: ##STR1## wherein Ar.sub.1 is 1,4-phenylene and/or 2,6-naphthalene, Ar.sub.2 is 2,6-naphthalene and/or 2,7-naphthalene, and X.sub.3 is an aliphatic hydrocarbon containing 2 to 8 carbon atoms.Type: GrantFiled: September 20, 1991Date of Patent: June 22, 1993Assignee: Polyplastics Co., Ltd.Inventors: Keiichi Kanaka, Noriyuki Hayashi, Toshihiro Kobashi, Yukihiko Kageyama, Kenji Hijikata
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Patent number: 5183878Abstract: An improved easily processable wholly aromatic polyester exhibiting melt anisotropy and excellent thermal stability is provided which consists essentially of the structural units (i) to (iii) wherein: ##STR1## and wherein Ar.sub.1 is 1,4-phenylene, Ar.sub.2 is 2,6-naphthalene and 2,7-naphthalene, and Ar.sub.3 is 1,4-phenylene and/or 4,4'-biphenylene.Type: GrantFiled: September 20, 1991Date of Patent: February 2, 1993Assignee: Polyplastics Co., Ltd.Inventors: Keiichi Kanaka, Noriyuki Hayashi, Toshihiro Kobashi, Yukihiko Kageyama, Kenji Hijikata
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Patent number: 5182359Abstract: Moldable polyester resins having high melt-phase stability and which form substantially no thermal decomposition products during melt-phase processing have a carboxyl end group concentration of no greater than 40 milliequivalent/kg, and are the reaction product of (a) an aromatic dicarboxylic acid or its ester-forming derivative, (b) an aliphatic dihydroxy compound having 2 to 8 carbon atoms, and (c) an ester-forming comonomer having the general formula (I):HO--R--O--A--O--R--OH (I)wherein A represents a divalent organic radical having at least one aromatic ring, R represents a divalent organic radical selected from the group consisting of aliphatic hydrocarbon groups and polyoxyalkylene groups each having 2 to 8 carbon atoms. The ester-forming comonomer is incorporated into the polyester resin chain in an amount between 0.01 to 7 molar %, based on the aromatic dicarboxylic acid.Type: GrantFiled: June 27, 1991Date of Patent: January 26, 1993Assignee: Polyplastics Co., Ltd.Inventors: Keiichi Kanaka, Kenji Hijikata
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Patent number: 5179192Abstract: An improved polyester exhibiting melt anisotropy and excellent thermal stability is provided which consists essentially of the structural units (I) to (III) wherein: ##STR1## wherein Ar.sub.1 is 1,4-phenylene, Ar.sub.2 is a mixed system of 2,6-naphthalene and 2,7-naphthalene, and Ar.sub.3 is an aromatic ring containing 6 or more carbon atoms, the unit (I) accounting for 15 to 90 mole percent and the unit (II) for 20 to 70 mole percent of the total amount of the structural units, and the percentage of 2,7-naphthalene to the total amount of Ar.sub.2 in the unit (II) being between 10 and 90 mole percent.Type: GrantFiled: September 20, 1991Date of Patent: January 12, 1993Assignee: Polyplastics Co., Ltd.Inventors: Keiichi Kanaka, Noriyuki Hayashi, Toshihiro Kobashi, Yukihiko Kageyama, Kenji Hijikata
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Patent number: 4902776Abstract: Poly-p-phenylene is produced by reaction of benzene with oxygen gas in the presence of a chloride of a metal having a lower valence and aluminum chloride.Type: GrantFiled: January 12, 1988Date of Patent: February 20, 1990Assignee: Hidefumi HiraiInventors: Hidefumi Hirai, Naoki Toshima, Keiichi Kanaka, Atsunori Koshirai