Elastomeric composition having oil resistance
An oil resistant polymer composition is disclosed that contains a thermoplastic elastomer combined with an olefin and vinyl acetate copolymer on an oleophobic agent. In one embodiment, the composition contains a thermoplastic polyester elastomer combined with an ethylene and vinyl acetate copolymer. In order to render the polymer composition oil resistant, the polymer composition can further contain an UHMW silicone, a fluoropolymer, and optionally a crosslinking agent and/or an antiplasticizer.
1. A polymer composition comprising a blend of:
a thermoplastic copolyester elastomer;
a second polymer comprising an olefin and vinyl acetate copolymer, and wherein the weight ratio between the thermoplastic copolyester elastomer and the olefin and vinyl acetate copolymer is from about 20:80 to about 80:20; and
an oleophobic agent comprising an ultrahigh molecular weight silicone.
2. A polymer composition as defined in claim 1 , wherein the ultrahigh molecular weight silicone has a kinematic viscosity of greater than about 100,000 mm 2 s −1 .
3. A polymer composition as defined in claim 1 , wherein the olephobic agent is present in the composition in an amount from about 0.05% to about 55% by weight.
4. A polymer composition as defined in claim 1 , wherein the composition contains a multi-functional crosslinking agent.
5. A polymer composition as defined in claim 1 , further containing an antiplasticizer.
6. A polymer composition as defined in claim 1 , wherein the olefin and vinyl acetate copolymer contains vinyl acetate in an amount from about 3 weight % to about 50 weight %.
7. A polymer composition as defined in claim 1 , wherein the olefin and vinyl acetate copolymer comprises an ethylene vinyl acetate copolymer.
8. A polymer composition as defined in claim 1 , wherein the polymer composition further comprises a coupling agent.
9. A polymer composition as defined in claim 1 , wherein the polymer composition further comprises a crosslinking agent comprising an epoxy functional group.
10. A polymer composition as defined in claim 1 , wherein the thermoplastic copolyester elastomer contains soft segments and hard segments.
11. A polymer composition as defined in claim 1 , wherein the thermoplastic copolyester elastomer comprises a multi-block copolyester elastomer.
12. A polymer composition as defined in claim 10 wherein the hard segments comprise ester units and the soft segments comprise an aliphatic polyester or a polyether glycol.
13. A molded article made from the polymer composition defined in claim 1 .
14. A cable or wire comprising a coating made from the polymer composition defined in claim 1 .
15. A case for an electronic device made from the polymer composition defined in claim 1 .
16. A grip or handle made from the polymer composition defined in claim 1 .
17. An interior automotive part made from the polymer composition defined in claim 1 .