Patent · US Expired

Fluoropolymers resistant to stress cracking

US6653379B2 · kind B2 · utility

0Cited by

13References

22Claims

0Family size

Assignee

3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

Thomas J. Blong · Woodbury, US
Lisa P. Chen · Okabena, US
Ralph Kaulbach · Emmerting, DE
Friedrich Kloos · Mainz, DE
Georg Burkard · Tönning, DE

Key dates

Filing date	Jul 12, 2001
Grant date	Nov 25, 2003
Priority date	—
Expiry date	Aug 14, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F214/262
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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:log(flex life cycles)&gE;0.71+4.0*(MFI(−0.294)), a method of making fluorothermoplastic compositions, a method of improving stress crack resistance, and fluorothermoplastic articles.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.