Core-shell polymer for use in tire treads
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United States of America Patent
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Aug 17, 1993
Grant Date -
N/A
app pub date -
Nov 4, 1991
filing date -
Nov 4, 1991
priority date (Note) -
Expired
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Abstract
A novel rubbery polymer suitable for use in tire tread formulations is characterized in that the polymer comprises polymer particles which have from 2 to 6 domains, each domain comprising from 100 to about 40 weight percent of at least one C.sub.4 to C.sub.8 conjugated diolefin monomer, from 0 to about 60 weight percent of at least one C.sub.3 3 to C.sub.6 alkenyl nitrile monomer and from 0 to about 60 weight percent of at least one C.sub.8 to C.sub.12 monovinylidene aromatic monomer for a total of 100 weight percent of the domain, the monomer composition and/or molecular weight of one domain of each polymer particle differing from the monomer composition and/or molecular weight of each of the other domains of the polymer particle. A process for the production of the rubbery polymer is provided together with a rubber composition comprising the rubbery polymer and at least one diene-based polymer.
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