PMMA MOULDING COMPOUNDS WITH IMPROVED IMPACT RESISTANCE
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Abstract
The invention describes a novel impact modifier, built up from core-shell1- and shell 2, the core being capable of plastic deformation. Good mechanical properties were achieved using a small amount of impact modifier.
93 Citations
20 Claims
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1-12. -12. (canceled)
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13. An impact resistant modifier consisting of at least one multistage emulsion polymer of bonded units of:
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i) a core (C) of the following polymerized monomeric components;
a) from 53 to 92.9% by weight of C1-C8-alkyl methacrylate b) from 7 to 35% by weight of C1-C8-alkyl acrylate c) from 0.1 to 2% by weight of at least one crosslinker, and d) from 0 to 8% by weight of one or more styrene derivatives;
ii) a first shell (S1) of the following polymerized monomeric components;
a) from 75 to 99.9% by weight of at least one C1-C8-alkyl acrylate b) from 0 to 25% by weight of one or more styrene derivatives, and c) from 0.1 to 2% by weight of at least one crosslinker, and iii) a second shell (S2), of the following polymerized monomeric components;
a) from 80 to 100.00% by weight of at least one C1-C8-alkyl methacrylate, b) from 0 to 20% by weight of at least one C1-C8-alkyl acrylate, and c) from 0 to 5% by weight of at least one regulator. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A molding comprising a molding composition comprising from 3 to 80% by weight of the impact modifier consisting of a multistage emulsion polymer of bonded units of:
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i) a plastically deformable core (C) of the following polymerized monomeric components;
a) from 53 to 92.9% by weight of C1-C8-alkyl methacrylate b) from 7 to 35% by weight of C1-C8-alkyl acrylate c) from 0.1 to 2% by weight of at least one crosslinker, and d) from 1 to 5% by weight of one or more styrene derivatives;
ii) an elastomeric first shell (S1) of the following polymerized monomeric components;
a) from 75 to 99.9% by weight of at least one C1-C8-alkyl acrylate b) from 0 to 25% by weight of one or more styrene derivatives, and c) from 0.1 to 2% by weight of at least one crosslinker, and iii) a hard second shell (S2), of the following polymerized monomeric components;
a) from 80 to 100.00% by weight of at least one C1-C8-alkyl methacrylate, b) from 0 to 20% by weight of at least one C1-C8-alkyl acrylate, and c) from 0 to 5% by weight of at least one regulator, and from 97 to 20% by weight of a thermoplastic molding composition comprising polymerized units of methyl methacrylate.
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Specification