Thermoplastic vulcanizates of carboxylated nitrile rubber and thermoplastic polyurethanes
AssigneeAdvanced Elastomer Systems, L.P.
InventorsTonson Abraham, Sabet Abdou-Sabet, Trazollah Ouhadi, Norman Barber
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Abstract
Low oil swell, non sticky readily processable carboxylated nitrile rubber-thermoplastic polyurethane vulcanizate compositions have increased upper service temperature over comparable thermoplastic polyurethanes. The compositions of the present invention are made utilizing a processing aid, for example, maleated polyolefins and addition type curing agents such as bisoxazolines or bisimidazolines. The compositions generally contain thermoplastic polyurethane as a continuous phase with the carboxylated nitrile rubber being dispersed therein.
Claims16
A thermoplastic vulcanizate composition, comprising a blend of a thermoplastic polyurethane and a carboxylated nitrile rubber, said blend being at least partially cured by an addition type curing agent selected from the group consisting of oxazolines, oxazines, and imidazolines, wherein said agent does not cause the evolution of volatiles during the curing of said rubber.
A process for preparing a thermoplastic vulcanizate composition comprising:
- dynamically vulcanizing a carboxylated nitrile rubber in the presence of a thermoplastic polyurethane, a processing aid, and an addition type curing agent selected from the group consisting of oxazolines, oxazines, and imidazolines, wherein said agent does not cause the evolution of volatiles during the curing of said rubber.
Dependencies are inferred from the claim text.