Semisintered polytetrafluoroethylene article and production ther

Details Semisintered polytetrafluoroethylene article and production ther Semisintered polytetrafluoroethylene article and production ther

1984-08-21

1986-06-24

Michl, Paul R.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521919, 528481, 264127, C08J 924

Patent

active

045968373

ABSTRACT:
A semisintered polytetrafluoroethylene article which is prepared by heating an unsintered polytetrafluoroethylene article at a temperature of at least the melting point of a sintered polymer, the article having an endothermic curve at a temperature of 345.+-.5.degree. C. on a crystalline melting chart measured with a differential scanning carolimeter and a crystalline conversion of from 0.10 to 0.85 defined by heat of fusion of the unsintered, semisintered and sintered polymer, and the crystallinity of the semisintered article measured by X-ray diffraction being from 80 to 93%. The article is expandable biaxially to afford a porous polytetrafluoroethylene material having an almost unporous surface.

REFERENCES:
patent: 3245972 (1966-04-01), Anderson et al.
patent: 3558583 (1971-01-01), Alsup et al.
patent: 3629219 (1971-12-01), Esker

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