Daikin Industries, Ltd.

Kazuo Ishiwari

Takahiro Kitahara

Tatsuya Higuchi

Tetsuo Shimizu

Masahiko Yamada

Tatsuro Uchida

Tsuyoshi Noguchi

Yoshihisa Yamamoto

Yoshihide Higashihata

Hidenori Ozaki

Kozo Asano

Takayuki Araki

Taketo Kato

Katsutoshi Yamamoto

Hiroyuki Yoshimoto

Takeshi Inaba

Kazutaka Hosokawa

Shigehito Sagisaka

Noriyasu Yamane

Shinichi Yano

Tuyoshi Miyamori

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.

Polytetrafluoroethylene laminated article

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&#xb1;500,000 and a maximum peak temperature of 327&#xb1;5&#xb0; 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&#xb1;1,000,000 and a maximum peak temperature of 340&#xb1;7&#xb0; 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&#xb1;5&#xb0; C. and 340&#xb1;7&#xb0; C. in the endothermic curve appearing on the crystalline melting curve obtained by using a differential scanning calorimeter.

Polytetrafluoroethylene mixed powder used for insulation of product for high frequency signal transmission and product for high frequency signal transmission using the same

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.

Polytetrafluoroethylene molded product in block form and method for production thereof

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&deg; C., 5 kg-load) and a melting point of 90 to 230&deg; 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&times;Y/100&gE;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.

Fluoropolymer laminate

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&times;10 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.

Fluorochemical adhesive material and laminate made with the same

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&deg; C. under a load of 5 kg, and a melting point of 90 to 200&deg; 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. The fluororesin can also be molded at a lower temperature than conventional fluororesins, and thus can be heat bonded or co-extruded with general purpose resins having low heat resistance.

Tetrafluoroethylene copolymer and use thereof

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&deg; C. under a load of 5 kg, and a melting point of 90 to 200&deg; 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.

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.

Polyphenylene sulfide resin composition and process for preparing the

A meltable fluorine-containing resin composition comprising

Meltable fluorine-containing resin composition

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.

Sliding material composition

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.

Process for preparing polytetrafluoroethylene powder

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:

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Settsu, Japan

Kazuo Ishiwari