Shaped article of an oriented tetrafluoroethylene polymer

Details Shaped article of an oriented tetrafluoroethylene polymer Shaped article of an oriented tetrafluoroethylene polymer

1987-03-18

1989-04-11

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

264127, 2642902, C08F 1418, B27J 500, B29D 722

Patent

active

048207870

ABSTRACT:
A shaped article composed of an at least biaxially orientated tetrafluoroethylene polymer of ultrahigh molecular weight, which has a draw ratio of at least 3.0, a specific gravity of at least 1.8 and an orientation release stress at 200.degree. C. of at least 5 Kg/cm.sup.2. The shaped article has excellent creep resistant and gas barrier properties, and can advantageously be utilized as a sealant, a lining material, a bearing pad, a sliding pad or the like. The shaped article may be produced by compressing a preformed sheet of a tetrafluoroethylene polymer at a temperature of from 170.degree. to 400.degree. C., under such conditions that plug flow of the polymer is produced, followed by cooling in the compressed state.

REFERENCES:
patent: 4388259 (1983-06-01), Jewell et al.
patent: 4519969 (1985-05-01), Murakami
patent: 4597920 (1986-07-01), Golike
patent: 4610833 (1986-09-01), Kanesaki et al.
patent: 4617164 (1986-10-01), Kanesaki et al.
patent: 4620955 (1986-11-01), Kono et al.
patent: 4692295 (1987-09-01), Vinatier
patent: 4698195 (1987-10-01), Okumura et al.
patent: 4707314 (1987-11-01), Kawahigashi
"Modern Plastics Encyclopedia", 1986-1987, p. 548.

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