Agc Inc.

Shiro Ebata

Shinya Higuchi

Takehiro Kose

Shun Saito

Sho Masuda

Toshinori Tomita

Masakazu Ataku

To provide a modified PTFE excellent in heat resistance. The modified polytetrafluoroethylene comprises a polymer having units based on tetrafluoroethylene and a polymer having units based on a fluorine-free monomer, wherein the endothermic amount ratio R calculated by a prescribed method is at least 0.65.

Product, and method for producing stretched porous material

To provide a modified polytetrafluoroethylene excellent in breaking strength. The modified polytetrafluoroethylene comprises a polymer having units based on tetrafluoroethylene and a polymer having units based on a monomer represented by formula (1), wherein the content of the units based on a monomer represented by formula (1) is from 10 to 500 mass ppm, to all units in the modified polytetrafluoroethylene, and the standard specific gravity is from 2.155 to 2.175,CH═CR-L-R  Formula (1):wherein Rrepresents a hydrogen atom or an alkyl group, L represents a single bond, —CO—O—*, —O—CO—*, or —O—, * represents a bonding position to R, and Rrepresents a hydrogen atom, an alkyl group, or a nitrile group.

Modified polytetrafluoroethylene, molded product, and method for producing stretched porous material

To provide a method for producing modified polytetrafluoroethylene, in which formation of a fluorinated oligomer as a by-product is little. A method for producing modified polytetrafluoroethylene which contains substantially no Cfluorinated oligomer containing hydrophilic functional groups and which contains substantially no fluorinated surfactant, the method comprising conducting copolymerization of tetrafluoroethylene and a monomer having a polar group, in a liquid dispersion 1 comprising a polymer containing units derived from a non-fluorinated monomer and an aqueous medium, or in a solution 2 obtainable by mixing at least one member selected from the group consisting of a polyalkylene oxide compound and a hydrocarbon-containing surfactant, with an oxidizing agent, in an aqueous medium, under such a condition that the amount of the monomer having a polar group to be used, is at most 0.150 mass % to the whole amount of tetrafluoroethylene, to obtain modified polytetrafluoroethylene.

Method for producing modified polytetrafluoroethylene, method for producing modified polytetrafluoroethylene powder, and method for producing stretched porous material

A method for producing a modified polytetrafluoroethylene, the method including: polymerizing tetrafluoroethylene in an aqueous medium in which a polymer having units based on a fluorine-free monomer is present. The fluorine-free monomer is a monomer represented by formula (1): CH&#x2550;CR-L-R, where Ris a hydrogen atom or an alkyl group, L is a single bond, &#x2014;CO&#x2014;O&#x2014;*, &#x2014;O&#x2014;CO&#x2014;* or &#x2014;O&#x2014;, * is a bonding position to R, and Ris an alkyl group. To the total amount of tetrafluoroethylene supplied to the polymerization, a proportion of the polymer is from 0.001 to 0.050 mass %.

To provide a coated body excellent in weather resistance and excellent also in pressure marking resistance. The coated body comprises a substrate, an undercoating film, a prescribed intermediate coating film and a top coating film formed by curing a top coating material comprising the following components (1) to (3), in this order: (1) a fluorinated polymer having hydroxy groups or carboxy groups; (2) a curing agent for curing the fluorinated polymer; and (3) a prescribed ultraviolet absorber.

Coated body and building exterior member

A method for producing a fluorinated copolymer solution polymerizing a monomer mixture of a fluoro-olefin (A), a monomer (B) having a crosslinkable group and a monomer (C) having no fluorine atom and no crosslinkable group in the presence of an organic solvent and a compound having two or more piperidyl group represented by the formula (1): 

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Chiyoda-ku, Japan

Shiro Ebata