Compatibilized abs-polycarbonate molding composition

Details Compatibilized abs-polycarbonate molding composition Compatibilized abs-polycarbonate molding composition

C - Chemistry, Metallurgy

08

L

C08L 69/00 (2006.01) C08L 25/00 (2006.01) C08L 25/12 (2006.01) C08L 33/00 (2006.01) C08L 51/04 (2006.01) C08L 55/02 (2006.01) C08L 25/02 (2006.01)

Patent

CA 2328869

A thermoplastic molding composition containing a blend of polycarbonate, vinyl copolymer, such as SAN, and a graft polymer, such as ABS is disclosed. The invention resides in the finding that the incorporation of a compatibilizing agent which comprises a polymeric resin having a number average molecular weight of at least about 21,000 and which is miscible with the grafted phase of the graft polymer and which contains secondary amine reactive groups in its structure yields stable compositions having improved mechanical properties especially at low temperatures.

Cette composition de moulage thermoplastique contient un mélange de polycarbonate, de copolymère vinylique, tel qu'un copolymère de styrène-acrylonitrile (SAN), et d'un polymère séquencé, tel qu'un acrylonitrile-butadiène-styrène (ABS). L'invention porte notamment sur le fait qu'en incorporant un agent de compatibilisation, lequel comprend une résine polymère possédant un poids moléculaire moyen en nombre d'au moins 21000, est miscible avec la phase greffée du polymère greffé et contient des groupes réactifs d'amine secondaire dans sa structure, on obtient des compositions stables possédant des propriétés mécaniques améliorées, notamment à basses températures.

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