Patent ID: 6624207
Filing Date: 2003-09-23
Classification: C08C,C08J

Abstract:
An aqueous polymer dispersion comprising rubber particles and polymer particles having a reinforcing action, wherein the rubber particles comprisex % by weight of an aromatic monovinyl compound and y % by weight of an aliphatic conjugated diene having from 4 to 9 carbon atoms in copolymerized form, and x is from 5 to 35 and y is from 65 to 95, and the polymer particles having a reinforcing action comprisefrom 50 to 90% by weight of a first, hard polymer phase A and from 10 to 50% by weight of a second, soft polymer phase B, where the polymer phase A has a glass transition temperature above 70Â° C. and comprises from 90 to 100% by weight of an aromatic monovinyl compound and up to 10% by weight of an aliphatic conjugated diene having from 4 to 9 carbon atoms in copolymerized form and the polymer phase B comprises xÂ±3% by weight of the aromatic monovinyl compound present in the rubber particles and yÂ±3% by weight of the aliphatic conjugated diene having from 4 to 9 carbon atoms present in the rubber particles in copolymerized form.