C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3031
C08L 55/02 (2006.01) C08F 279/04 (2006.01)
Patent
CA 1225772
ABS COMPOSITIONS AND PROCESS FOR PREPARING SAME ABSTRACT An intermediate for use in a polyblend con- sisting essentially of a copolymer of monoalkenyl aromatic monomer such as styrene and a ethylenically unsaturated nitrile monomer such as acrylonitrile surface grafted onto rubber which is dispersed in a matrix copolymer of the graft copolymer monomers, the dispersed phase being monomodal in particle size distribution and the weight percent of surface- grafted nitrile monomer being less by at least 2% than the weight percent nitrile monomer in the matrix. This intermediate with mismatched nitrile monomer can be blended with another rubber graft copolymer of different particle size dispersed in ungrafted matrix which contains matched nitrile monomer in the surface graft and matrix to provide a polyblend having proper- ties at least equivalent to those obtained by blending two rubber graft copolymers of different particle size dispersed in a matrix which each contain matched nitrile monomer levels in the surface graft and matrix. The mismatched intermediate is prepared by continuous mass polymerization.
468235
Mcfadden Fincham
Monsanto Company
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