Process for surface treating phosphonitrilic fluoroelastomers

Details Process for surface treating phosphonitrilic fluoroelastomers Process for surface treating phosphonitrilic fluoroelastomers

1989-07-24

1990-07-31

Anderson, Harold D.

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

Synthetic resins

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

528399, C08G 7902

Patent

active

049451391

ABSTRACT:
A process for treating the surface of a cured phosphonitrilic fluoroelastomer of the formula ##STR1## where x is an integer of from about 3 to about 50,000, Q and Q' are the same or different and are fluoroalkoxy of the formula --OCH.sub.2 (CF.sub.2).sub.m CF.sub.2 Z where m is an integer from 0 to 20 and Z is hydrogen or fluorine and Q" is a group having some olefinic unsaturation with a solution of an alkali metal fluoroalkoxide of the formula MOC.sub.n.sup.f where M is an alkali metal and C.sub.n.sup.f is a fluorocarbon moiety of the formula --(CH.sub.2).sub.y (CF.sub.2).sub.n CF.sub.3 where y is 1 or 2 and n is an integer from 1 to 20. The process of this invention causes the replacement of some of the Q and Q' groups with --OC.sub.n.sup.f. The decreased number of Q and Q' where Z is hydrogen results in a cured phosphonitrilic fluoroelastomer surface displaying improved resistance to polar solvents.

REFERENCES:
patent: 3370020 (1968-02-01), Allcock et al.
patent: 3515688 (1970-06-01), Rose
patent: 3888800 (1975-06-01), Allcock
patent: 4005171 (1977-01-01), Reynard et al.

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