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MOUSSES ET PROCÉDÉS DE FORMATION DE MOUSSES DE COPOLYMÈRES À CHAÎNE ÉTENDUE/RAMIFIÉS DE MONOMÈRES AROMATIQUES SUBSTITUÉS DE VINYLIDÈNE
MOUSSES ET PROCÉDÉS DE FORMATION DE MOUSSES DE COPOLYMÈRES À CHAÎNE ÉTENDUE/RAMIFIÉS DE MONOMÈRES AROMATIQUES SUBSTITUÉS DE VINYLIDÈNE
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摘要
A foaming composition useful to make an extruded foam is comprised of : a copolymer of a vinylidene aromatic monomer and an unsaturated compound containing nucleophilic groups, a copolymer of vinylidene aromatic monomer and an unsaturated compound having electrophilic groups; and a blowing agent. The foaming composition may be made into a foam by heating the foaming composition to a temperature sufficient to melt and react said copolymers to form a chain extended/branched copolymer and extruding the foaming composition from a higher pressure to a lower pressure to form an extruded foam comprised of the chain extended/branched copolymer. The foam is comprised of a chain extended/branched copolymer that is the reaction product of (i) a copolymer of one or more vinylidene aromatic monomers and one or more unsaturated compounds containing nucleophilic groups, and (ii) a copolymer of one or more vinylidene aromatic monomers and one or more unsaturated compounds having electrophilic groups.
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