Mixtures of an aromatic vinyl resin and of polyphenylene ether with improved impact strength
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United States of America Patent
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N/A
Issued Date -
Apr 11, 2002
app pub date -
Jun 20, 2001
filing date -
Jun 20, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a rigid material based on PPO and an aromatic vinyl resin with improved impact strength comprising: 99 to 20% of a resin (A) consisting of a mixture of PPO and of an aromatic vinyl resin, 1 to 80% of an impact modifier comprising at least one block copolymer S-B-M in which: each block is linked to the other by means of a covalent bond or an intermediate molecule linked to one of the blocks by a covalent bond and to the other block by another covalent bond, M consists of MMA monomers optionally copolymerized with other monomers and comprises at least 50% by weight of methyl methacrylate (MMA), B is incompatible with the resin (A) and with the M block and its glass transition temperature Tg is less than the temperature for using the rigid material, S is incompatible with the B block and the M block and its Tg or its melting point m.p. is greater than the Tg of B, S is compatible with the resin (A). The aromatic vinyl resin is advantageously polystyrene and the triblock S-B-M consists of polystyrene, polybutadiene and PMMA respectively.
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