Halogenated isobutylene-based copolymers having enhanced...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

Reexamination Certificate

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C524S445000, C524S493000

Reexamination Certificate

active

10476541

ABSTRACT:
The invention provides a method for increasing the viscosity of halogenated (brominated) elastomeric copolymers of a C4to C7isomonoolefin (isobutylene) and a para-alkylstryrene (p-methylstyrene) by mixing the copolymer with a silica or clay particulate filler which has been contacted with an aminosilane containing at least one C1to C4alkoxy group and at least one primary, secondary or tertiary amine group. The resulting elastomer compositions are used to prepare thermoplastic elastomer blend compositions, containing more finely dispersed elastomers which results in compositions having improved mechanical properties.

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