EXTRUDED SAN FOAMS
    53.
    发明专利

    公开(公告)号:CA2773246A1

    公开(公告)日:2011-03-10

    申请号:CA2773246

    申请日:2010-09-06

    Applicant: BASF SE

    Abstract: The invention relates to a closed-cell extruded foam that can be produced (a) by at least one styrene-acrylonitrile copolymer (SAN), and optionally at least one thermoplastic polymer from the group consisting of styrene copolymers, polyolefins, polyacrylates, polycarbonates (PC), polyesters, polyamides, polyether sulfones (PES), polyether ketones (PEK) and polyether sulfides, in order to form a polymer melt, (b) introducing between 1 and 12 wt. % (in relation to P) of a foaming constituent (T) containing less than 0.2 wt. % of water (in relation to P) and b1) between 15 and 95 wt. % (in relation to T) of carbon dioxide and b2) between 5 and 85 wt. % (in relation to T) of at least one co-foaming agent selected from the group consisting of C1-C4 alcohols and C1-C4 carbonyl compounds, into the polymer melts in order to form an expandable melt, (c) extruding the expandable melt in a region of lower pressure while expanding to form the extruded foam, and (d) optionally adding additives to form the polymer components (P) in at least one of the steps a), b) and/or c).

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