Readily process-able, oil-resistant thermoplastic vulcanizates
AssigneeParker-Hannifin Corporation
InventorsTonson Abraham, Aditya Jindal, Michael P. Mallamaci, Taylor L. Wilson
Life of this patent
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Abstract
Disclosed are thermoplastic vulcanizates comprising a plastic phase and a rubber phase and process for preparing such thermoplastic vulcanizates, wherein the plastic phase comprises a thermoplastic polymer and the rubber phase comprises a carboxylated nitrile rubber.
Claims25
A thermoplastic vulcanizate comprising a plastic phase and a rubber phase, wherein
- a) the plastic phase comprises from about 35 parts to about 95 parts by weight, based on 100 parts by weight of the plastic and rubber phases, of a plastic having a melting point of about 160° C. to about 260° C., wherein the plastic is
- i) a semi-crystalline engineering polyester,
- ii) a semi-crystalline copolyester elastomer,
- iii) a semi-crystalline aliphatic polyamide, or a mixture thereof;
- and
- b) the rubber phase comprises from about 65 parts to about 5 parts, by weight based on 100 parts by weight of the plastic and rubber phases, of a carboxylated nitrile rubber;
- and
- c) crosslinks between reactive groups in the carboxylated nitrile rubber.
A thermoplastic elastomer comprising a plastic phase and a rubber phase, wherein
- a) the plastic phase comprises from about 35 parts to about 95 parts by weight, based on 100 parts by weight of the plastic and rubber phases, of a plastic having a melting point of about 160° C. to about 260° C., wherein the plastic is
- i) a semi-crystalline engineering polyester,
- ii) a semi-crystalline copolyester elastomer,
- iii) a semi-crystalline aliphatic polyamide, or a mixture thereof;
- and
- b) the rubber phase comprises from about 65 parts to about 5 parts, by weight based on 100 parts by weight of the plastic and rubber phases, of a carboxylated nitrile rubber;
- and
- c) an optional plasticizer, wherein the amount of plasticizer, when present, is from about 0 parts to about 35 parts, based on 100 parts by weight of the plastic and rubber phases.
A process for producing a thermoplastic vulcanizate comprising mixing a composition comprising a plastic phase and a rubber phase with an addition type curing agent, wherein the mixing is carried out under conditions of shear and at a temperature above the melting point of the plastic phase, and wherein
- the plastic phase comprises from about 35 parts to about 95 parts by weight, based on 100 parts by weight of the plastic and rubber phases, of a plastic having a melting point of about 160° C. to about 260° C., wherein the plastic is
- a semi-crystalline engineering polyester,
- a semi-crystalline copolyester elastomer, or
- a semi-crystalline aliphatic polyamide, or mixtures thereof;
- and
- the rubber phase comprises from about 65 parts to about 5 parts, by weight based on 100 parts by weight of the plastic and rubber phases, of a carboxylated nitrile rubber.
Dependencies are inferred from the claim text.