The West Company

Anthony S Esposito

Ghawamedin Bayan

A method of making a thermoplastic elastomer composition produced by dynamic vulcanization of SBR as a dispersed phase of cross linked SBR, and a co-continuous matrix of SEBS and polypropylene. The dynamic vulcanization step takes place under conditions of shear and temperature to reach the decomposition point of crosslinked SBR, at which time the crosslinking reaction is quenched. Compositions of superior properties are achieved using this method.

Method of making SBR thermoplastic elastomers

A thermoplastic elastomer composition is possible which has low coefficient friction, reduced stickiness and good structural integrity. A halobutyl rubber is cured by dynamic vulcanization in the presence of sufficient thermoplastic material to function as a continuous phase for the vulcanization. Thereafter, up to 25 parts based on 100 parts of the rubber of an uncured organopolysiloxane grafted EPDM polymer are admixed to form the final moldable product, resulting in a mixture which has good structural integrity and a smooth finished surface.

Modified halobutyl thermoplastic elastomer

A soft, high strength thermoplastic elastomeric composition for use in medical and pharmaceutical products, comprising an ethylene butylene block copolymer having terminal polystyrene units, a platicizer in an amount sufficient to soften the ethylene butylene phase of the copolymer, and a thermoplastic acrylic resin in an amount ranging from 15 to 65 parts per 100 parts of the copolymer.

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Pottstown, PA, United States of America

Anthony S Esposito