Nitrile polymer vulcanizate and process for the production threrof
AssigneeBayer Aktiengesellschaft
InventorEzio Campomizzi
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Abstract
A nitrite polymer vulcanizate having improved hot air aging characteristics is described. The nitrile polymer vulcanizate may be produced admixing a composition comprising: (i) a nitrite polymer; (ii) a filler; (iii) an additive selected from the group comprising a strong base, a salt of a strong base and a weak acid, a salt of a weak acid, a carbodiimide, a polycarbodiimide and mixtures thereof; and (iv) a vulcanization system. A vulcanizable composition useful for producing such a vulcanizate and a method for improving the hot air aging characteristics of a nitrite polymer are also described.
Claims30
A vulcanizable composition comprising:
- (i) a nitrile polymer;
- (ii) a filler;
- (iii) an additive selected from the group comprising a strong base, a salt of a strong base and a weak acid, a salt of a weak acid, a carbodiimide, a polycarbodiimide and mixtures thereof;
- and
- (iv) a vulcanization system.
A method for improving the hot air aging characteristics of a nitrile polymer comprising the step of admixing a nitrite polymer with an additive selected from the group comprising:
- a strong base, a salt of a strong base and a weak acid, a salt of a weak acid, a carbodiimide, a polycarbodiimide and mixtures thereof.
A hydrogenated nitrile polymer vulcanizate having a hot air aging time to reach 100% elongation at break of at least about 200 hours when measured pursuant to ASTM-D573-88 at 150° C., the vulcanizate derived from a sulfur-based vulcanization system
Dependencies are inferred from the claim text.