Hydrosilylation crosslinking
AssigneeAdvanced Elastomer Systems, L.P.
InventorsRobert Eugene Medsker, Raman Patel
Life of this patent
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Abstract
An improved process for the preparation of thermoplastic elastomers by hydrosilylation crosslinking, in which a platinum containing hydrosilylation catalyst is used in combination with specific diene-containing rubbers. A fully crosslinked rubber component is obtained in the thermoplastic elastomer composition.
Claims19
In a process for the hydrosilylation crosslinking of a composition comprising a blend of a thermoplastic resin and an unsaturated rubber by dynamic vulcanization, the improvement which comprises employing a hydrosilylation crosslinking agent and from about 0.01 to about 4 ppm, based on the weight of the rubber and expressed as platinum metal, of a platinum-containing hydrosilylation catalyst in combination with an EPDM rubber containing 5-vinyl-2-norborene as a diene monomer, whereby a fully crosslinked rubber is obtained in a matrix of thermoplastic resin.
A process for the production of a thermoplastic elastomer composition, which process comprises the steps of:
- a) mixing a thermoplastic resin and an EPDM rubber containing 5-vinyl-2-norbornene as a diene monomer component,
- b) adding a hydrosilylation agent to the mixture from (a),
- c) blending the mixture from (b) at a temperature sufficient to cause the mixture to flow,
- d) incorporating into the mixture a platinum-containing hydrosilylation catalyst in an amount ranging from about 0.01 to about 4 parts per million parts of rubber, based on the weight of the rubber and expressed as platinum metal, and
- e) masticating the mixture from (d) until the rubber is fully crosslinked.
In a thermoplastic elastomer composition comprising a blend of thermoplastic resin and unsaturated EPDM rubber which has been crosslinked by dynamic vulcanization, the improvement comprising a composition in which the rubber contains 5-vinyl-2-norbornene as a diene monomer, and is crosslinked using a hydrosilylation crosslinking agent an from about 0.01 to about 4 ppm, based on the weight of the rubber and expressed as platinum metal, of a platinum-containing hydrosilylation catalyst.
Dependencies are inferred from the claim text.