Fluoropolymers resistant to stress cracking

Details Fluoropolymers resistant to stress cracking Fluoropolymers resistant to stress cracking

2006-01-10

2006-01-10

Wu, David W. (Department: 1713)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C524S379000, C524S544000, C524S545000, C524S805000, C526S089000, C526S206000, C526S247000

Reexamination Certificate

active

06984697

ABSTRACT:
The invention provides a fluorothermoplastic composition comprising interpolymerized units derived from about 94 to about 97.5 mole percent (mol %) tetrafluoroethylene (TFE), about 2 to about 3 mol % perfluoro (propyl vinyl ether) (PPVE), and about 0.5 to about 3 mol % hexafluoropropylene (HFP). The invention also provides a fluorothermoplastic composition comprising interpolymerized units derived from about 94 to about 97 mol % TFE, about 0.75 to about 3 mol % PPVE, and about 1.5 to about 3.5 mol % HFP. These fluorothermoplastic compositions have a flex life that fits the equation:in-line-formulae description="In-line Formulae" end="lead"?log(flex life cycles)≧0.71+4.0*(MFI(−0.294)),in-line-formulae description="In-line Formulae" end="tail"?a method of making fluorothermoplastic compositions, a method of improving stress crack resistance, and fluorothermoplastic articles.

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International Standard ISO 4599, “Plastics—Determination of Resistance To Environmental Stress Cracking (ESC)—Bent Strip Method”, First Edition—Apr. 15, 1986.

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