Vulcanization of fluoroalkoxyphosphazene polymers
AssigneeHorizons Incorporated, a division of Horizons Research Incorporated
InventorsJohn C. Vicic, Richard W. Sicka
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Abstract
The properties of fluoroalkoxyphosphazene polymers are improved by compounding the polymers with certain fillers some of which may be reactive, a class of polyfunctional coagents, a vulcanizing agent and possibly other additives and thereafter vulcanizing the resulting compositions. The resulting vulcanizates have improved properties and extend the utility of the phosphazene polymers for use as mechanical goods, seals, O-rings and gaskets for extreme service environments.
Claims19
A process for the production of thermally stable, fluid resistant vulcanized polyphosphazene copolymers, terpolymers and mixtures thereof which comprises mixing 100 parts by weight of unvulcanized elastomeric polyphosphazene polymer represented as consisting of randomly distributed repeating units having the following formulae ##EQU2## in which OR and OR' are selected from the group consisting of fluoroalkoxy groups represented by the formula Z(CF.sub.2).sub.n CH.sub.2 O-- wherein Z represents H or F and n is an integer between 2 and 9 and aryloxy groups with:
- 0. 1 to 20 parts by weight of a coagent which is at least trifunctional and taken from the class of compounds which contain allyl, vinyl, propenyl, acrylate, or methacrylate moieties on aliphatic or aromatic or heterocyclic nuclei;
- 20 to 150 parts by weight of a reactive silane treated clay or aluminum silicate filler;
- up to 10 parts by weight or metal oxide selected from the group consisting of MgO, ZnO, ZrO.sub.2, or BaZrO.sub.3 ;
- up to 10 parts by weight of a vulcanizing agent selected from the group consisting of benzoyl peroxide, dicumyl peroxide, and 2,5-bis(t-butylperoxy)2,5-dimethylhexane;
- and thereafter vulcanizing the resulting composition.
A vulcanizable composition suitable for the production of thermally stable, fluid resistant articles comprising:
- between about 0.1 to 20 parts by weight of a coagent which is at least trifunctional and taken from the class of compounds which contain allyl, vinyl, propenyl, acrylate, or methacrylate moieties on aliphatic or aromatic or heterocyclic nuclei;
- 20 to 150 parts by weight of a reactive silane treated clay or aluminum silicate filler;
- up to 10 parts be weight of metal oxide selected from the group consisting of MgO, ZnO, ZrO.sub.2 or BaZrO.sub.3 ;
- up to 10 parts by weight of a vulcanizing agent selected from the group consisting of benzoyl peroxide, dicumyl peroxide and 2,5-bis(t-butylperoxy)2,5-dimethylhexane;
- and
- 100parts by weight of unvulcanized elastomeric polyphosphazene polymer represented as consisting of randomly distributed repeating units having the following formulae ##EQU3## in which OR and OR' are selected from the group consisting of fluoroalkoxy groups represented by the formula Z(CF.sub.2).sub.n CH.sub.2 O-- wherein Z represents H or F and n is an integer between 2 and 9 and aryloxy groups.
Dependencies are inferred from the claim text.