Impact modified thermoplastic polyurethane molding...

Details Impact modified thermoplastic polyurethane molding... Impact modified thermoplastic polyurethane molding...

C - Chemistry, Metallurgy

08

L

400/3070

C08L 51/00 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2011871

IMPACT MODIFIED THERMOPLASTIC POLYURETHANE MOLDING COMPOSITIONS, A PROCESS FOR THEIR PREPARATION AND THEIR USE ABSTRACT OF DISCLOSURE The subject of the instant invention is impact modified thermoplastic polyurethane molding compositions, comprising: A) 70 to 99 parts by weight of at least one thermoplastic polyurethane elastomer (A); B) 1 to 30 parts by weight of at least one graft polymer (B), comprising: B1) an elastomer (B1) serving as a grafting basis having a glass temperature less than -40° C; and, B2) a grafting basis (B2) prepared in one or two steps, comprising; .alpha.-methylstyrene and acrylonitrile; or .alpha.- methylstyrene, styrene, and acrylonitrile; whereby in grafting basis (B2); i) the amount of .alpha.-methylstyrene units polymerized in situ is greater than the styrene units, ii) the weight ratio of the .alpha.-methylstyrene units or .alpha.- methylstyrene styrene units polymerized in situ to the acrylonitrile units is from 60:40 to 90:10; and, iii) the grafting degree lies between 15 and 30, the parts by weight of (A) and (B) total 100 parts by weight, C) 0 to 60 weight percent of at least one additive, based on the weight of (A) and (B). -31- , .. . .. .. . .. . .. .

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