Patent ID: 6852764

Claim:
A process for the production of a cork for liquid containers comprising providing a masterbatch which comprises: (a) from 20 to 60 wt. % of a thermoplastic elastomer re resulting from the copolymerization of a vinylaromatic monomer and a conjugated diene monomer containing from 80 to 20 wt. % of the vinylaromatic polymer and 20 to 80 wt. % of the conjugate diene polymer; (b) from 8 to 30 wt. % of a vinylaromatic polymer, other than the thermoplastic elastomer of subparagraph (a); (c) from 10 to 30 wt. % of at least one processing aid which decreases the viscosity of the masterbatch allowing improved processing speed; (d) optionally up to 20 wt. % of one or more additives selected from the group consisting of lubricity agents, which improve the introduction of the cork in containers and fillers; (e) a blowing agent; and (f) molding said masterbatch to form a cork.