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US 4,051,103 AGranted
Stabilization of polyfluorophosphazenes with zinc hippurate
AssigneeThe Firestone Tire & Rubber Company
InventorsDelmar Frederick Lohr, Jr., Jung Wong Kang
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Abstract
When polyphosphazenes are exposed to elevated temperatures, their physical properties deteriorate. The addition of zinc bis hippurate to polyphosphazene rubbers has been found to result in improved retention of the physical properties of polyphosphazenes. Further the use of such an additive does not adversely affect the ability of peroxy compounds to cure the polyphosphazenes to form vulcanizates.
Claims11
A polyphosphazene composition stabilized against thermal aging comprising (1) a polyphosphazene represented by the general formula:
- ##STR4## wherein n represents an integer from 20 up to about 50,000 and X and X.sub.1 each represent a monovalent substituent selected from the groups consisting of alkoxy, substituted alkoxy, aryloxy, substituted aryloxy, hydroxy, and amino, and X and X.sub.1 are randomly distributed along the --P.dbd.N-- backbone and the polyphosphazene includes one or two or more randomly distributed groups, and (2) a stabilizer consisting of an organic compound compatible with said polyphosphazene and present in an amount sufficient to stabilize said polyphosphazene against thermal degradation, said organic compound being zinc bis hippurate.
Dependencies are inferred from the claim text.