Patent ID: 11939473
Assignee: CELANESE INTERNATIONAL CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 12:
13. A process for producing a thermoplastic vulcanizate composition, the process comprising:
(a) supplying to a mixer at least the following components: (i) a cross-linkable rubber comprising an ethylene propylene diene terpolymer, (ii) a thermoplastic polymer comprising a propylene ethylene copolymer, (iii) a first polysiloxane composition comprising a migratory siloxane polymer physically dispersed in a first thermoplastic material, wherein the migratory siloxane polymer of first polysiloxane composition has a viscosity ranging from 30,000 to 70,000 mPa.s (measured at 25° C.), and (iv) a second polysiloxane composition comprising a non-migratory, siloxane polymer bonded to a second thermoplastic material; and
(b) mixing the components (i) to (iv) under conditions such that the thermoplastic polymer melts and the rubber is at least partially crosslinked to produce a heterogeneous product comprising particles of the at least partially crosslinked rubber dispersed in a matrix comprising the thermoplastic polymer, wherein a rubber phase comprising the cross-linkable rubber constitutes from 10 to 80 wt. % of the composition, a thermoplastic phase comprising the thermoplastic polymer constitutes from 5 to 75 wt. % of the composition, the first polysiloxane composition constitutes from 0.2 to 20 wt. % of the composition, and the second polysiloxane composition constitutes from 0.2 to 20 wt. % of the composition.