IMPACT-RESISTANT COMPOSITIONS BASED ON THERMOPLASTIC METHACRYLIC (CO)POLYMER

摘要

The invention concerns thermoplastic impact-resistant compositions comprising (A) a thermoplastic methacrylic polymer or copolymer (P) including for the major part methyl methacrylate units, (B) at least an impact resistance enhancing additive and at least a grafted elastomeric polymer (C) bearing thermoplastic methacrylic (co)polymer groups (P) grafted at least in pendant position on an elastomeric copolymer (C DEG ), said elastomeric copolymer (C DEG ) being obtained from (i) at least a vinylaromatic monomer (C<1>), (ii) at least a monomer (C<2>) selected among the C1-C15 linear or branched alkyl acrylates, alkoxyalkyl acrylates wherein the alkyl group(s) have 1 to 4 carbon atoms and aralkyl acrylates wherein the alkyl group(s) has/have 1 to 15 carbon atoms and/or at least a diene monomer (C<3>) and (iii) optionally at least an ethylenically unsaturated monomer (C<4>) with pendant initiator function(s), said monomer(s) (C<4>) being necessary in the absence of monomer (C<3>), said grafted elastomeric copolymer (C) being dispersed in the matrix (A) in the form of nodules 10 to 500 nm in size capable of having a droplet, capsule-type single-inclusion and/or salami-type multiple inclusion morphology.