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AssigneeAsahi Glass Company, Limited
InventorsShigeki Kobayashi, Shinya Higuchi, Masataka Arai, Hiroki Nagai
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Provided are a tetrafluoroethylene copolymer excellent in paste extrudability, which comprises a unit based on tetrafluoroethylene and a unit based on a monomer represented by a formula of CF2═CF—O—(CF2)nCF═CF2 (wherein n is an integer of from 1 to 6), wherein a content of the unit based on the monomer represented by the formula is from 0.1 to 0.5% by mass, wherein a particle size of a primary particle is from 0.1 to 0.5 μm, wherein a standard specific gravity is from 2.14 to 2.25, wherein a paste extrusion pressure is from 24.5 to 73.5 MPa and wherein the copolymer remains not undergoing melt molding; a fine powder of a tetrafluoroethylene copolymer; and a production method and a paste extruded product thereof. The TFE copolymer is excellent in paste extrudability and the molded product thereof is excellent in heat resistance and transparency.
A tetrafluoroethylene copolymer capable of undergoing paste extrusion comprising a unit based on tetrafluoroethylene and a unit based on a monomer represented by the following general formula (1), wherein a content of the unit based on the monomer represented by the general formula (1) is from 0.1 to 0.5% by mass, wherein a particle size of a primary particle is from 0.1 to 0.5 μm, wherein a standard specific gravity is from 2.14 to 2.25, wherein the copolymer is capable of undergoing paste extrusion at a pressure of from 24.5 to 73.5 MPa without undergoing melt molding,
A method for producing a tetrafluoroethylene copolymer comprising effecting an emulsion polymerization of tetrafluoroethylene with a monomer represented by the following general formula (1) under such a condition that a polymerization amount of the monomer represented by the general formula (1) is in a range of from 0.1 to 0.5% by mass, thereby obtaining a tetrafluoroethylene copolymer capable of undergoing paste extrusion which has a particle size of a primary particle of from 0.1 to 0.5 μm and a standard specific gravity of from 2.14 to 2.25, wherein the copolymer is capable of undergoing paste extrusion at a pressure of from 24.5 to 73.5 MPa without undergoing melt molding,
Dependencies are inferred from the claim text.