Novel polytetrafluoroethylene fine powder

Details Novel polytetrafluoroethylene fine powder Novel polytetrafluoroethylene fine powder

1986-04-29

1987-12-22

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

524546, C08F 1426

Patent

active

047147482

ABSTRACT:
Polytetrafluoroethylne fine powder is disclosed 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 micron, and further having a clear endothermic peak at a temperature of 347.degree..+-.3.degree. C. and 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. An unsintered article is made which is sintered and expanded at a temperature higher than the melting point of the polytetrafluoroethylene to give a porous article having improved properties.

REFERENCES:
patent: Re31341 (1983-08-01), Koizumi et al.
patent: 2874152 (1959-02-01), Bolstad et al.
patent: 3006881 (1961-10-01), Bolstad et al.
patent: 3088941 (1963-05-01), Uhland
patent: 3535301 (1970-10-01), Groppelli et al.
patent: 3953412 (1976-04-01), Saito et al.
patent: 4078134 (1978-03-01), Kuhls et al.
patent: 4363900 (1982-12-01), Shimzu et al.

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