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    THERMOPLASTISCHE FORMMASSEN MIT VERBESSERTEN OPTISCHEN EIGENSCHAFTEN
    31.
    发明公开
    THERMOPLASTISCHE FORMMASSEN MIT VERBESSERTEN OPTISCHEN EIGENSCHAFTEN 有权
    具有改进的光学性能的热塑性模塑材料

    公开(公告)号：EP1937772A1

    公开(公告)日：2008-07-02

    申请号：EP06793774.8

    申请日：2006-09-25

    Applicant: BASF SE

    Inventor： WEBER, Martin ,  GOTTSCHALK, Axel ,  ITTEMANN, Peter ,  HÖNL, Hans

    IPC: C08L33/12 ,  C08L25/12 ,  C08L51/00

    CPC classification number: C08L33/12 ,  C08F279/02 ,  C08F285/00 ,  C08L25/12 ,  C08L35/06 ,  C08L51/04 ,  C08L55/02 ,  C08L2205/03 ,  C08L2666/02 ,  C08L2666/04

    Abstract: The present invention relates to thermoplastic plastic moulding compositions, comprising a mixture composed of (A) from 30 to 69% by weight, based on the entirety of components (A), (B) and (C), of a methyl methacrylate polymer, (B) from 30 to 69% by weight, based on the entirety of components (A), (B) and (C), of a copolymer, obtainable via polymerization of a vinylaromatic monomer and of a vinyl cyanide, and (C) from 1 to 40% by weight, based on the entirety of components (A), (B) and (C), of a graft copolymer, obtainable from (C1) from 60 to 90% by weight, based on (C), of an agglomerated core based on a 1,3-diene, (C2) from 5 to 20% by weight, based on (C), of a first graft shell composed of a vinylaromatic monomer, of an alkyl methacrylate, and, if appropriate, of a crosslinking monomer, and (C3) from 5 to 20% by weight, based on (C), of a second graft shell composed of an alkyl (meth)acrylate polymer, with the proviso that the quantitative ratio of (C2) to (C3) is in the range from 2:1 to 1:2, and it is inventively significant here that the core (C1) has a monomodal particle size distribution, the average particle size D50 of the core (C1) (determined by the method mentioned in the description) is in the range from 300 to 400 nm, and the difference between the refractive index (nD-C) of the entire component (C) and the refractive index (nD-AB) of the entire matrix of components (A) and (B) is in the range from 0.003 to 0.008, each of the refractive indices being measured by the methods mentioned in the description, and also to processes for preparation of these moulding compositions, to their use, and to the mouldings obtainable therefrom.

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