Patents by Inventor Kazuo Ishiwari
Kazuo Ishiwari 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: 7244503Abstract: To provide a PTFE laminated article having a sufficient adhesive strength and a PTFE backing sheet having a low permeability, in which a specific weight of a PTFE sheet can be maintained high. A specific weight of the PTFE sheet is maintained at 2.175 or more by carrying out thermo-fusing of the PTFE sheet and a film or sheet of heat-meltable resin such as PFA after interposing a layer of PTFE fine particles between them or by carrying out treatment for preventing a rapid temperature lowering after the thermo-fusing without interposing the layer of PTFE fine particles.Type: GrantFiled: October 13, 2005Date of Patent: July 17, 2007Assignee: Daikin Industries, Ltd.Inventors: Kazuo Ishiwari, Tatsuro Uchida, Masahiko Yamada
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Publication number: 20060037696Abstract: To provide a PTFE laminated article having a sufficient adhesive strength and a PTFE backing sheet having a low permeability, in which a specific weight of a PTFE sheet can be maintained high. A specific weight of the PTFE sheet is maintained at 2.175 or more by carrying out thermo-fusing of the PTFE sheet and a film or sheet of heat-meltable resin such as PFA after interposing a layer of PTFE fine particles between them or by carrying out treatment for preventing a rapid temperature lowering after the thermo-fusing without interposing the layer of PTFE fine particles.Type: ApplicationFiled: November 8, 2005Publication date: February 23, 2006Inventors: Kazuo Ishiwari, Tatsuro Uchida, Masahiko Yamada
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Publication number: 20060035089Abstract: To provide a PTFE laminated article having a sufficient adhesive strength and a PTFE backing sheet having a low permeability, in which a specific weight of a PTFE sheet can be maintained high. A specific weight of the PTFE sheet is maintained at 2.175 or more by carrying out thermo-fusing of the PTFE sheet and a film or sheet of heat-meltable resin such as PFA after interposing a layer of PTFE fine particles between them or by carrying out treatment for preventing a rapid temperature lowering after the thermo-fusing without interposing the layer of PTFE fine particles.Type: ApplicationFiled: October 13, 2005Publication date: February 16, 2006Inventors: Kazuo Ishiwari, Tatsuro Uchida, Masahiko Yamada
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Patent number: 6994908Abstract: To provide a PTFE laminated article having a sufficient adhesive strength and a PTFE backing sheet having a low permeability, in which a specific weight of a PTFE sheet can be maintained high. A specific weight of the PTFE sheet is maintained at 2.175 or more by carrying out thermo-fusing of the PTFE sheet and a film or sheet of heat-meltable resin such as PFA after interposing a layer of PTFE fine particles between them or by carrying out treatment for preventing a rapid temperature lowering after the thermo-fusing without interposing the layer of PTFE fine particles.Type: GrantFiled: July 22, 1999Date of Patent: February 7, 2006Assignee: Daikin Industries, Ltd.Inventors: Kazuo Ishiwari, Tatsuro Uchida, Masahiko Yamada
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Patent number: 6987224Abstract: A polytetrafluoroethylene mixed powder, which is obtained by mixing low molecular weight polytetrafluoroetylene powder and high molecular weight polytetrafluoroethylene powder obtained by emulsion polymerization of tetrafluoroethylene, wherein the low molecular weight polytetrafluoroetylene powder has a number average molecular weight of 1,000,000±500,000 and a maximum peak temperature of 327±5° C. in the endothermic curve appearing on the crystalline melting curve obtained by using a differential scanning calorimeter, the high molecular weight polytetrafluoroetylene powder has a number average molecular weight of 4,500,000±1,000,000 and a maximum peak temperature of 340±7° C. in the endothermic curve appearing on the crystalline melting curve obtained by using a differential scanning calorimeter, and the mixed powder has evident peak temperatures of 327±5° C. and 340±7° C. in the endothermic curve appearing on the crystalline melting curve obtained by using a differential scanning calorimeter.Type: GrantFiled: May 29, 2001Date of Patent: January 17, 2006Assignee: Daikin Industries, Ltd.Inventors: Katsutoshi Yamamoto, Hiroyuki Yoshimoto, Kazuo Ishiwari, Shinichi Yano
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Patent number: 6899932Abstract: A block-shaped baked molded article having little block deformation amount is obtained in order to reduce a loss of materials until a stable film or sheet can be cut from a block-shaped molded article. After a polytetrafluoroethylene powder is compression-molded to form a preform, the resultant preform is baked while being rotated, thereby to produce a polytetrafluoroethylene molded article.Type: GrantFiled: September 7, 1999Date of Patent: May 31, 2005Assignee: Daikin Industries, Ltd.Inventors: Kazuo Ishiwari, Tatsuro Uchida, Masahiko Yamada
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Patent number: 6780483Abstract: A layer of a tetrafluoroethylene copolymer having 30 to 81% by mole of tetrafluoroethylene and 70 to 19% by mole of at least one other monomer and having a carbonate group in a polymer chain or at a polymer chain terminal, which has a melt flow rate of 0.1 to 100 g/10 minutes (230° C., 5 kg-load) and a melting point of 90 to 230° C. and a layer of a polyolefin resin are adhered with a layer of an ethylene-vinyl acetate copolymer, which satisfies the following relationship: X×Y/100≧7.0, wherein X is a vinyl acetate content (% by mole) and Y is a saponification degree of a methyl ester (%). The resulting laminate has high resistance to fuels, and the layer of the tetrafluoroethylene copolymer having a carbonate group and the layer of the polyolefin resin are firmly adhered.Type: GrantFiled: February 25, 2002Date of Patent: August 24, 2004Assignee: Daikin Industries Ltd.Inventors: Tatsuya Higuchi, Hidenori Ozaki, Takahiro Kitahara, Kazuo Ishiwari
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Publication number: 20040112627Abstract: An insulating layer for high frequency signal transmission device having a low dielectric constant, low dielectric dissipation factor and improved end processability, and a material powder thereof are provided. A polytetrafluoroethylene mixed powder for insulation of a product for high-frequency signal transmission, which is obtained by mixing low molecular weight polytetrafluoroetylene powder and high molecular weight polytetrafluoroethylene powder obtained by emulsion polymerization of tetrafluoroethylene, wherein the low molecular weight polytetrafluoroetylene powder has a number average molecular weight of 1,000,000±500,000 and a maximum peak temperature of 327±5° C. in the endothermic curve appearing on the crystalline melting curve obtained by using a differential scanning calorimeter, the high molecular weight polytetrafluoroetylene powder has a number average molecular weight of 4,500,000±1,000,000 and a maximum peak temperature of 340±7° C.Type: ApplicationFiled: December 13, 2002Publication date: June 17, 2004Inventors: Katsutoshi Yamamoto, Hiroyuki Yoshimoto, Kazuo Ishiwari, Shinichi Yano
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Patent number: 6680124Abstract: A fluorine-containing adhesive material comprising a fluorine-containing ethylenic polymer having a carbonate group and/or a carboxylic halide group at a chain end or a side chain of polymer, wherein a total of a number of the carbonate groups and/or carboxylic halide groups is at least 150 relative to 1×106 main chain carbons, can directly impart the firm adherability to a substrate such as a metal, a glass or a resin while maintaining excellent properties such as resistance to chemicals, resistance to solvent, weatherability and resistance to stain possessed by a fluorine-containing polymer.Type: GrantFiled: November 6, 2000Date of Patent: January 20, 2004Assignee: Daikin Industries Ltd.Inventors: Takayuki Araki, Takahiro Kitahara, Shigehito Sagisaka, Taketo Kato, Takeshi Inaba, Kazuo Ishiwari, Tetsuo Shimizu, Hidenori Ozaki, Tatsuya Higuchi
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Patent number: 6538084Abstract: A tetrafluoroethylene copolymer comprising 30 to 81 mole % of tetrafluoroethylene and a 70 to 19 mole % of at least one other monomer, and having terminal carbonate groups at polymer chain ends, which has a melt flow rate of 0.1 to 100 g/10 min. at 200° C. under a load of 5 kg, and a melting point of 90 to 200° C., a laminate comprising a layer of the above tetrafluoroethylene copolymer, and a layer of other material, and a surface film or a transparent filler material for a solar cell, which comprises the above tetrafluoroethylene copolymer is disclosed. The fluororesin can be firmly adhered directly to other materials such as resins, metals, glass, crystalline silicon, polycrystalline silicon and amorphous silicon, while maintaining characteristics such as chemical resistance, solvent resistance, non-tackiness, electrical insulation properties, stain-proofing properties and flame retardance.Type: GrantFiled: December 11, 2001Date of Patent: March 25, 2003Assignee: Daikin Industries, Ltd.Inventors: Takahiro Kitahara, Kozo Asano, Kazuo Ishiwari, Yoshihide Higashihata, Tatsuya Higuchi
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Publication number: 20020128412Abstract: A tetrafluoroethylene copolymer comprising 30 to 81 mole % of tetrafluoroethylene and a 70 to 19 mole % of at least one other monomer, and having terminal carbonate groups at polymer chain ends, which has a melt flow rate of 0.1 to 100 g/10 min. at 200° C. under a load of 5 kg, and a melting point of 90 to 200° C., a laminate comprising a layer of the above tetrafluoroethylene copolymer, and a layer of other material, and a surface film or a transparent filler material for a solar cell, which comprises the above tetrafluoroethylene copolymer is disclosed. The fluororesin can be firmly adhered directly to other materials such as resins, metals, glass, crystalline silicon, polycrystalline silicon and amorphous silicon, while maintaining characteristics such as chemical resistance, solvent resistance, non-tackiness, electrical insulation properties, stain-proofing properties and flame retardance.Type: ApplicationFiled: December 11, 2001Publication date: September 12, 2002Applicant: Daikin Industries Ltd.Inventors: Takahiro Kitahara, Kozo Asano, Kazuo Ishiwari, Yoshihide Higashihata, Tatsuya Higuchi
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Patent number: 6372870Abstract: A tetrafluoroethylene copolymer comprising 30 to 81 mole % of tetrafluoroethylene and a 70 to 19 mole % of at least one other monomer, and having terminal carbonate groups at polymer chain ends, which has a melt flow rate of 0.1 to 100 g/10 min. at 200° C. under a load of 5 kg, and a melting point of 90 to 200° C. This copolymer can be firmly adhered directly to other materials such as general-purpose resins while maintaining the good properties of fluororesins such as chemical resistance, weather resistance, solvent resistance, non-tackiness, electrical insulation, stain-proofing properties, and flame retardance, molded at a lower temperature than conventional fluororesins, and heat bonded or co-extruded with general-purpose resins having low heat resistance.Type: GrantFiled: December 23, 1999Date of Patent: April 16, 2002Assignee: Daikin Industries Ltd.Inventors: Takahiro Kitahara, Kozo Asano, Kazuo Ishiwari, Yoshihide Higashihata, Tatsuya Higuchi
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Patent number: 5784677Abstract: An electrophotographic printer includes: a photosensitive drum; a latent image forming portion for forming electrostatic latent images on the photosensitive drum based on print information; a developing portion for developing the electrostatic latent images using toner; an intermediate transfer drum for receiving the toner images from the photosensitive drum; a transportation portion for delivering a recording medium; and a transfer roll for transferring the toner image from the intermediate transfer roll to the recording medium. A pressure force P.sub.1 between the photosensitive drum and the intermediate transfer drum is less than a pressure force P.sub.2 between the transfer roll and the intermediate transfer drum. P.sub.1 and P.sub.2 may also have the relationship P.sub.1 .gtoreq.P.sub.2 sin.theta., where .theta.Type: GrantFiled: May 31, 1996Date of Patent: July 21, 1998Assignee: Toray Industries Inc.Inventors: Yoshihiro Tamura, Hidetoshi Hara, Yuichi Nakao, Kazuo Ishiwari
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Patent number: 5470901Abstract: A polyphenylene sulfide resin composition comprising 100 parts by weight of a polyphenylene sulfide resin and 0.5 to 50 parts by weight of a crosslinked fluorine-containing elastomer, which has improved impact resistance while keeping excellent properties of the polyphenylene sulfide resin.Type: GrantFiled: January 23, 1995Date of Patent: November 28, 1995Assignee: Daikin Industries, Ltd.Inventors: Kazuo Ishiwari, Yoshihisa Yamamoto, Tetsuo Shimizu
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Patent number: 5394232Abstract: An electrophotographic printer method for a printer including a photosensitive drum; a latent image former for forming electrostatic latent images based on the color-separated print information for individual colors on the photosensitive drum; a wet developer for developing the electrostatic latent images successively into toner images for the individual colors using liquid toners of different colors corresponding to the print information and for squeezing surplus liquid toners on the photosensitive drum; an intermediate transfer drum so that the toner images of the individual colors developed on the photosensitive drum are successively transferred to and deposited in layers to form a multicolor toner image; a transportation device for delivering a recording medium; and a transfer-fixing device for transferring to and fixing the multicolor toner image on the recording medium.Type: GrantFiled: March 22, 1993Date of Patent: February 28, 1995Assignee: Tokyo Industries, Inc.Inventors: Yoshihiro Tamura, Hara Hidetoshi, Yuichi Nakao, Kazuo Ishiwari
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Patent number: 5179167Abstract: A meltable fluorine-containing resin composition comprising(A) a copolymer which has a molecular weight distribution peak in a lower molecular weight region and is selected from the group consisting of a tetrafluoroethylene/hexafluoropropylene copolymer and a copolymer of tetrafluorethylene and at least one fluorovinyl ether of the formula:CF.sub.2 .dbd.CF--O--R.sub.fwherein R.sub.f is a fluoroalkyl group having 1 to 10 carbon atoms, and(B) a copolymer which has a molecular weight distribution peak in a higher molecular weight region and is selected from the group consisting of a tetrafluoroethylene/hexafluoropropylene copolymer and a copolymer of tetrafluoroethylene and at least one fluorovinyl ehter of the formula:CF.sub.2 .dbd.CF--O--R.sub.fwherein R.sub.f is the same as defined above, which has good mechanical properties and molding properties.Type: GrantFiled: October 5, 1989Date of Patent: January 12, 1993Assignee: Daikin Industries, Ltd.Inventors: Kazuo Ishiwari, Tsuyoshi Noguchi
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Patent number: 5159019Abstract: A sliding material composition comprising (a) 100 parts by weight of polyphenylene sulfide and (b) 5 to 100 parts by weight of a resin mixture of 10 to 90% by weight of a melt processable fluorine-containing resin and 90 to 10% by weight of polytetrafluoroethylene, which has good abrasion resistance and lubricating properties without the deterioration of impact strength.Type: GrantFiled: June 5, 1991Date of Patent: October 27, 1992Assignee: Daikin Industries Ltd.Inventors: Yoshihisa Yamamoto, Tuyoshi Miyamori, Kazuo Ishiwari
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Patent number: 5118788Abstract: Polytetrafluoroethylene powder having an average particle size of 1 to 30 .mu.m and a specific surface area of 2 to 6 m.sup.2 /g is prepared by heating unsintered polytetrafluoroethylene powder having a melting point of 313.degree. to 330.degree. C. at a temperature in a range from a temperature 70.degree. C. lower than the melting point to a temperature lower than the melting point and comminuting the heated powder.Type: GrantFiled: May 6, 1991Date of Patent: June 2, 1992Assignee: Daikin Industries Ltd.Inventors: Kazutaka Hosokawa, Tetsuo Shimizu, Kazuo Ishiwari, Noriyasu Yamane
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Patent number: 5041500Abstract: A heterogeneous meltable fluorine-containing polymer blend composition which comprises a tetrafluoroethylene/hexafluoropropylene copolymer and a copolymer of tetrafluoroethylene and at least one fluorovinyl ether of the formula:CF.sub.2 .dbd.CF--O--R.sub.f (I)wherein R.sub.f is a fluoroalkyl group having 1 to 10 carbon atoms, which is easily molded and provides an article having good mechanical properties.Type: GrantFiled: September 25, 1989Date of Patent: August 20, 1991Assignee: Daikin Industries, Ltd.Inventors: Kazuo Ishiwari, Tsuyoshi Noguchi
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Patent number: 4690869Abstract: A transparent coating material comprises a polymer which contains at least 50 wt. % of a structural unit represented by the formula ##STR1## wherein X is fluorine or alkyl having 1 to 6 carbon atoms, and R.sup.1 is fluoroalkyl.Type: GrantFiled: January 23, 1986Date of Patent: September 1, 1987Assignee: Daikin Kogyo Co., Ltd.Inventors: Akira Ohmori, Kazuo Ishiwari