Reinforced rubber dispersions, their preparation and use
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United States of America Patent
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Jul 20, 1999
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N/A
app pub date -
Jun 27, 1996
filing date -
Jul 14, 1995
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Expired
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Abstract
Aqueous, highly concentrated rubber dispersions, containing a reinforcing multiphase polymer dispersion comprising 60 to 95% by weight of aromatic monovinyl compounds and 40 to 5% by weight of aliphatic conjugated dienes having 4 to 9 carbon atoms, the particles of the reinforcing component consisting of a) 20 to 75% by weight of a hard inner phase having a glass transition temperature above 70.degree. C., consisting of 90 to 100% by weight of aromatic monovinyl compounds and 10 to 0% by weight of aliphatic conjugated dienes having 4 to 9 carbon atoms, b) 78 to 15% by weight of a soft outer phase having a glass transition temperature below 20.degree. C., consisting of 30 to 70% by weight of aromatic monovinyl compounds and 70 to 30% by weight of aliphatic conjugated dienes having 4 to 9 carbon atoms, and c) 2 to 10% by weight of transition regions between these phases, whose copolymer compositions are between those of the hard and of the soft phases.
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