Patent ID: 7534832

Claim:
An acrylic impact modifier having a multilayered structure, which comprises: a) 0.5 to 40 parts by weight (based on the weight of the total composition) of a seed comprising a copolymer of vinyl monomers and hydrophilic monomers, comprising: on the basis of the weight of the seed monomers, i) 65 to 99.4 parts by weight of vinyl monomers; ii) 0.5 to 30 parts by weight of hydrophilic monomers; and iii) 0.1 to 5 parts by weight of crosslinking monomers; b) 50 to 89.5 parts by weight (based on the weight of the total composition) of a rubbery core surrounding the seed and consisting essentially of: on the basis of the weight of the core monomers, i) 95.0 to 99.9 parts by weight C 2 to C 8 alkyl acrylate; and ii) 0.1 to 5.0 parts by weight of crosslinking monomers; and c) 10.0 to 49.5 parts by weight (based on the weight of the total composition) of a shell surrounding the a rubbery core and comprising: on the basis of the weight of the shell monomers, i) 95.0 to 99.9 parts by weight of C 1 to C 4 alkyl methacrylate; and ii) 0.1 to 5.0 parts by weight of crosslinking monomers.