Porous polytetrafluoroethylene material

Details Porous polytetrafluoroethylene material Porous polytetrafluoroethylene material

1986-07-15

1988-07-26

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521919, 264127, C08J 924

Patent

active

047601027

ABSTRACT:
A porous polytetrafluoroethylene material produced by forming a mixture of an adequate amount of a liquid lubricant and polytetrafluoroethylene fine powder having an average molecular weight of at least 6,000,000, an amorphous index larger than 0.1 and a number average primary particle size of 0.1 to 0.8 microns, and a clear endothermic peak at a temperature of 347.+-.3.degree. C. and an another endothermic peak or shoulder at a temperature between 330.degree. C. and the temperature of said clear endothermic peak on a crystalline melting chart recorded by a differential scanning calorimeter, removing the lubricant to obtain an unsintered PTFE material and expanding the unsintered polytetrafluoroethylene material at least monoaxially at a temperature higher than the melting point of polytetrafluoroethylene.

REFERENCES:
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patent: 3953566 (1976-04-01), Gore
patent: 4225547 (1980-09-01), Okita
patent: 4234535 (1980-11-01), Okita
patent: 4478898 (1984-10-01), Kato
patent: 4481158 (1984-11-01), Georlette, II et al.
patent: 4482516 (1984-11-01), Bowman et al.
patent: 4496507 (1985-01-01), Okita et al.

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