Patent ID: 7589154

Claim:
Process for the production of thermoplastic vulcanizates, which comprises (a) preparing a mixture of polymeric materials, including a matrix and a disperse phase component, and (b) carrying out dynamic vulcanization of the disperse phase component, said dynamic vulcanization comprising the steps of: b.1) grafting an organic silane on said disperse phase component, whereby to produce grafted disperse phase component chains; and b.2) cross-linking said disperse phase component chains in the presence of a cross-linking agent comprising an acid; wherein the weight ratio of said cross-linking agent to said organic silane is from 1:3 to 1:1, and the duration of said cross linking is from a minute to half an hour; and wherein said grafting and said cross-linking are carried out in the molten state of said disperse phase component in the absence of water addition into said mixture of polymeric materials.