Patents by Inventor Yukio Ikenaga
Yukio Ikenaga 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: 4886851Abstract: A polyacetal resin composition comprises polyacetal and a two- or more-stage polyacrylate comprising a rubber like first stage and a thermoplastic rigid final stage. It is useful for a metallized article with a high impact resistance.Type: GrantFiled: February 14, 1986Date of Patent: December 12, 1989Assignee: Polyplastics Company, Ltd.Inventors: Yukio Ikenaga, Masami Yamawaki
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Patent number: 4777204Abstract: A resin composition is suitable for molding to a gear and comprises 30 to 98 percent by weight of a resin being capable of the anisotropic phase in the molten state and the melt processing and 2 to 70 percent by weight of fibers such as metal fibers, carbon fibers, glass fibers, inorganic fibers, synthetic fibers and mineral fibers.Type: GrantFiled: June 22, 1987Date of Patent: October 11, 1988Assignee: Polyplastics Co., Ltd.Inventors: Yukio Ikenaga, Katsuhiko Takahashi, Kenji Hijikata, Toshio Kanoe, Tsuneyoshi Okada
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Patent number: 4772421Abstract: An electroconductive resin composite is produced by polymerizing at least one monomer a polymer of which is electroconductive in a matrix of a resin which exhibits the anisotropy in the melt phase to form a composite of the obtained polymer and the resin. The resin composite is obtained in the form of film and a moulded article.Type: GrantFiled: September 16, 1986Date of Patent: September 20, 1988Assignee: Polyplastics Co., Ltd.Inventors: Yukio Ikenaga, Katsuhiko Takahashi, Tsuneyoshi Okada, Kenji Hijikata, Toshio Kanoe
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Patent number: 4737398Abstract: A laminated film comprises a metallic film and a polymer layer which has been laminated on the metallic film, the polymer being anisotropic in the melt phase.Type: GrantFiled: November 26, 1985Date of Patent: April 12, 1988Assignee: Polyplastics Co., Ltd.Inventors: Yukio Ikenaga, Katsuhiko Takahashi, Tsuneyoshi Okada, Kenji Hijikata, Toshio Kanoe
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Patent number: 4730015Abstract: A polyacetal resin composition comprises a polyacetal resin as the matrix, (A) 0.01 to 2.0 percent by weight of a stabilizer selected from a benzotriazole compound, a benzophenone compound and an aromatic benzoate compound and (B) 0.01 to 2.0 percent by weight of a hindered amine compound and is improved in whetherability.Type: GrantFiled: July 22, 1985Date of Patent: March 8, 1988Assignee: Polyplastics Co., Ltd.Inventors: Yukio Ikenaga, Masami Yamawaki, Kunio Suzuki
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Patent number: 4726998Abstract: A magnetic disk comprises a substrate of a resin composition comprising a polymer being capable of the anisotropic phase in the molten state and a magnetic layer formed on at least one surface of said substrate. The substrate is a laminate of a plurality, preferably two, of monoaxially oriented sheets, eventually being multiaxially oriented.Type: GrantFiled: June 5, 1986Date of Patent: February 23, 1988Assignee: Polyplastics Co., Ltd.Inventors: Yukio Ikenaga, Katsuhiko Takahashi, Kenji Hijikata, Toshio Kanoe, Tsuneyoshi Okada
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Patent number: 4719171Abstract: An optical disc comprises a substrate formed from a polymer being capable of the anisotropic melt phase and being melt-processable, a recording layer having pits and grooves, formed on the substrate, and a metal coating layer, formed on the recording layer.Type: GrantFiled: March 30, 1987Date of Patent: January 12, 1988Assignee: Polyplastics Co., Inc.Inventors: Yukio Ikenaga, Katsuhiko Takahashi, Tsuneyoshi Okada, Kenji Hijikata, Toshio Kanoe
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Patent number: 4717624Abstract: A laminated sheet comprises a first layer of a melt-phase anisotropy exhibiting thermoplastic polymer, having a negative linear expansion coefficient in the direction of the polymer flow and a second layer having a positive linear expansion coefficient in the direction of the polymer flow, both layers having been laminated one on another in the alternative way, further each layer having a thickness such that the negative linear expansion coefficient of said first layer and the positive linear expansion coefficient of the second layer having been offset against each other.Type: GrantFiled: November 22, 1985Date of Patent: January 5, 1988Assignee: Hoechst Celanese CorporationInventors: Yukio Ikenaga, Katsuhiko Takahashi, Tsuneyoshi Okada, Kenji Hijikata, Toshio Kanoe
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Patent number: 4626371Abstract: A magnetic composite comprises a magnetic powder and a resin binder of a melt-processable polymer to form the anisotropic melt phase.Type: GrantFiled: September 9, 1985Date of Patent: December 2, 1986Assignee: Celanese CorporationInventors: Yukio Ikenaga, Katsuhiko Takahashi, Tsuneyoshi Okada, Kenji Hijikata, Toshio Kanoe
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Patent number: 4596847Abstract: A polyacetal resin composition is provided which has improved antistatic, heat stability and mechanical properties and contains a polyacetal homopolymer or copolymer, carbon black and a nonionic surfactant which is a polypropylene glycol/polyethylene glycol ether copolymer.Type: GrantFiled: November 12, 1985Date of Patent: June 24, 1986Assignee: Polyplastics Co., Ltd.Inventors: Takuzo Kasuga, Yukio Ikenaga, Masami Yamawaki, Keizo Tanimura
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Patent number: 4579935Abstract: The polymer or a copolymer of trioxane copolymer is manufactured by adding 0.001 to 2.0 wt. % of a stereo-hindering phenol to the monomer mixture in advance to the polymerization step and polymerizing trioxane and an optional co-monomer in the presence of a cationic, active catalyst and said phenol.Type: GrantFiled: April 17, 1985Date of Patent: April 1, 1986Assignee: Polyplastics Co., Ltd.Inventors: Takuzo Kasuga, Takeshi Asano, Yukio Ikenaga, Masami Yamawaki, Yasuyuki Takeda, Koichi Ichimura
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Patent number: 4578408Abstract: Disclosed is a photodiscoloration-resistant polyester resin composition comprising 100 parts by weight of a polyester resin and, incorporated therein, (1) 3 to 50 parts by weight of a brominated cyanuric acid ester compound; and (2) a benzotriazole-type ultraviolet stabilizer in an amount of up to 5 parts by weight per 100 parts by weight of the polyester resin. This composition is excellent in the flame retardance and photodiscoloration resistance, and bleeding of the contained flame retardant does not occur in this composition.Type: GrantFiled: August 6, 1982Date of Patent: March 25, 1986Assignee: Polyplastics Co., Ltd.Inventors: Masatoshi Matsuoka, Yukio Ikenaga, Osamu Matsuno
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Patent number: 4559380Abstract: A polyacetal composition which comprises polyacetal, an aliphatic ester of a polyhydric alcohol having a hydroxy group, polyethylene glycol, and an organometallic salt, wherein the organometallic salt is present in an amount of from 0.01 to 5 percent by weight based on the total composition.Type: GrantFiled: April 8, 1985Date of Patent: December 17, 1985Assignee: Polyplastics Company, Ltd.Inventors: Takuzo Kasuga, Yukio Ikenaga, Masami Yamawaki, Keizo Tanimura
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Patent number: 4555357Abstract: Polyacetal resin composition containing electrically conductive carbon black is improved in respect to stability to heat by incorporating thereinto an amide compound.Type: GrantFiled: September 12, 1983Date of Patent: November 26, 1985Assignee: Polyplastics Company, Ltd.Inventors: Takuzo Kausga, Yukio Ikenaga, Kunio Suzuki
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Patent number: 4547565Abstract: A trioxane copolymer is manufactured by adding to trioxane and a co-monomer, 0.0001 to 2.0 percent by weight, based on the total weight of the monomers, of one or more sterically hindered phenols, then co-polymerizing the resultant mixture in the presence of a cation-active catalyst, and then treating the resultant copolymer by heating it at a temperature which is higher than the melting point of the copolymer to melt the copolymer and decompose and remove unstable parts of the copolymer.Type: GrantFiled: June 8, 1984Date of Patent: October 15, 1985Assignee: Polyplastics Company, Ltd.Inventors: Takuzo Kasuga, Takeshi Asano, Yukio Ikenaga, Masami Yamawaki, Yasuyuki Takeda, Koichi Ichimura
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Patent number: 4418162Abstract: A method for the surface treatment of polyacetal resin characterized in that the resin is treated with an acidic solution containing chloride ions and sulfuric acid ions can activate the surface so that the shaped article can be easily plated.Type: GrantFiled: December 28, 1981Date of Patent: November 29, 1983Assignee: Polyplastics Co., Ltd.Inventors: Takuzo Kasuga, Yukio Ikenaga, Masami Yamawaki
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Patent number: 4390684Abstract: A continuous polymerization method to obtain polymer production in the form of fine particles from a liquid polymerization medium; the reaction being conducted in a polymerization reactor wherein mixing is effected by the action of a plurality of elliptical paddles mounted on each of dual rotating shafts, characterised in that the dual shafts are rotated in reverse directions to each other, and the paddles being enclosed by walls of the reactor with the inside surface of the walls closely defining the surface generated by the rotation of the ends of both sets of paddles; and with the ends of major axes of the elliptical paddles on one rotating shaft periodically approaching the ends of minor axes of the corresponding elliptical paddles on the other rotating shaft to effect a mixing action as well as a longitudinal shearing action across a notional interface between the two shafts. The method is particularly useful for the polymerization of trioxane.Type: GrantFiled: August 12, 1981Date of Patent: June 28, 1983Assignee: Polyplastics Co., Ltd.Inventors: Hiroyasu Komazawa, Tadashi Mori, Yukio Ikenaga, Hiroshi Hotta, Tuneyasu Nakashima
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Patent number: 4274986Abstract: A polyacetal composition having excellent antistatic characteristics, good surface luster and moldability is disclosed. The composition embodying these properties includes a polyacetal resin and incorporated therein, a polyhydric alcohol fatty acid ester including a hydroxyl group and a polyethylene glycol.Type: GrantFiled: May 5, 1980Date of Patent: June 23, 1981Assignee: Celanese CorporationInventors: Yukio Ikenaga, Osamu Matsuno