Tetrafluoroethylene copolymer, its production method and...

Details Tetrafluoroethylene copolymer, its production method and... Tetrafluoroethylene copolymer, its production method and...

2006-07-04

2006-07-04

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S250000, C526S234000, C526S919000

Reexamination Certificate

active

07071273

ABSTRACT:
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.

REFERENCES:
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patent: 2005/0064195 (2005-03-01), Kobayashi et al.
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U.S. Appl. No. 11/080,636, filed Mar. 16, 2005, Oharu et al.

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