Shock vinylaromatic polymer by polymerization of a vinylaromatic monomer in the presence of free radical and a polymerization initiator
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United States of America Patent
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Nov 9, 2004
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N/A
app pub date -
Aug 31, 2001
filing date -
Jun 3, 1998
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Expired
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Abstract
The invention concerns a method for preparing a composition comprising a vinylaromatic polymer enclosing rubber nodules. The invention is characterised in that it includes a step for polymerising at least one vinylaromatic monomer in the presence of rubber, a polymerisation initiator and a stable free radical, said step being such that [F.sub.SFR.times.(SFR)]: [F.sub.AMO.times.(AMO)] range from 0.05 to 1, F.sub.FSR and F.sub.AMO representing the functionality of the stable free radical and the initiator respectively and (SFR) and (AMO) representing the molar quantities of the stable free radical and the initiator respectively, The final composition is particularly resistant to shock and/or shiny.
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