Expanded porous polytetrafluoroethylene film having elastic...

Details Expanded porous polytetrafluoroethylene film having elastic... Expanded porous polytetrafluoroethylene film having elastic...

2011-07-12

2011-07-12

Del Sole, Joseph S (Department: 1743)

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

C264S210100

Reexamination Certificate

active

07976751

ABSTRACT:
An expanded porous polytetrafluoroethylene film having residual strain of at most 11.0% as measured after a load required to indent a rod, which is in a columnar form that its outer diameter is at least 2 mm and at least 1.9 times as much as the thickness of the film, and has a smooth plane perpendicular to its axis at a free end surface thereof and a modulus of longitudinal elasticity of at least 1.0×104kgf/mm2, up to 20% of the film thickness at a strain rate of 100%/min from the free end surface is applied repeatedly 20 times, and a production process of the porous film, in which a step of compressing an expanded porous polytetrafluoroethylene film having a high draw ratio is provided.

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