Reinforced rubber dispersions, their preparation and use

Details Reinforced rubber dispersions, their preparation and use Reinforced rubber dispersions, their preparation and use

C - Chemistry, Metallurgy

08

L

C08L 9/00 (2006.01) C08F 285/00 (2006.01) C08J 9/12 (2006.01) C08J 9/30 (2006.01)

Patent

CA 2181114

Aqueous, highly concentrated rubber dispersions, contain- ing a reinforcing multiphase polymer dispersion compris- ing 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 rein- forcing component consisting of a) 20 to 75% by weight of a hard inner phase having a glass transition temperature above 70°C, consisting of 90 to 100% by weight of aromatic monovinyl com- pounds and 10 to 0% by weight of aliphatic con- jugated 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°C, consisting of 30 to 70% by weight of aromatic monovinyl com- pounds and 70 to 30% by weight of aliphatic con- jugated 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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