Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1989-06-30
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
049451405
ABSTRACT:
An improved process for the preparation of highly fluorinated phosphonitrilic elastomers is disclosed. The fluoroalkoxy substituents on phosphonitrilic fluoroelastomers which contain some or all fluoroalkoxy groups in which the terminal carbon bears one or more hydrogen atoms are exchanged with fully fluorinated alkoxide groups in which the terminal carbon bears three fluorines. The process is accomplished using a ligand replacement mixture of an alkali metal fluoroalkoxide of the formula MOC.sub.n.sup.f and a fluoroalcohol of the formula HOC.sub.n.sup.f' where C.sub.n.sup.f is --(CH.sub.2).sub.y (CF.sub.2).sub.n CF.sub.3 where y is an integer 1 or 2 and n is an integer from 0 to 20 and C.sub.n.sup.f' is the same or different from C.sub.n.sup.f where C.sub.n.sup.f' is --(CH.sub.2).sub.y (CF.sub.2).sub.n CF.sub.3 where y and n are as previously defined.
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.
Klobucar W. Dirk
Kolich Charles H.
Anderson Harold D.
Ethyl Corporation
Hammond Richard J.
Mosley T.
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