Importance

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Abstract

A graft consisting of from 5 to 90% of a core A1 having a glass transition temperature above 25.degree. C. made up of, from 50 to 99.9% of a vinylaromatic monomer and from 0.1 to 10% of a polyfunctional crosslinking and/or graft-linking monomer optionally up to 49.9% of one or more copolymerizable monomers; from 5 to 90% of a first shell A2 of elastomeric material made up of from 50 to 99.8% of an alkyl acrylate and/or of a diene, from 0.1 to 10% of a polyfunctional graft-linking monomer, up to 49.8% of one or more copolymerizable unsaturated monomers and from 0.1 to 10% of one or more monomers containing acidic groups; from 5 to 90% of a second shell A3 of rigid material made up of from 50 to 99.9% of a vinylaromatic monomer, up to 10% of a polyfunctional cross-linking and/or graft-linking monomer, up to 49.9% of one or more copolymerizable monomers and from 0.1 to 20% of a monomer containing one or more basic groups; and optionally up to 85% of a third shell A4 of a copolymer of, from 1 to 99% of one or more vinylaromatic monomers and from 1 to 99% of one or more copolymerizable monomers. The percentages are by weight and based, in the case of the monomers, on the core or shells to which they belong and, in the case of the core and shells A1-A4, on the sum of A1 to A4.

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First Claim