Production of polystyrene for foaming applications using a...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/00 (2006.01)

Patent

CA 2553277

It has been discovered that improved polystyrene products may be obtained by polymerizing styrene in the presence of at least one multifunctional initiator that is trifunctional or tetrafunctional and at least one lower functionality initiator that is difunctional or monofunctional. These polymers may have increased Mz, increased MFI, and increased MWD. Optionally the resin may include at least one chain transfer agent, at least one cross-linking agent and/or a styrene-conjugated diene-styrene block copolymer. The presence of the multifunctional initiator tends to cause more branched structures in the polystyrene.

On a découvert que des produits en polystyrène améliorés peuvent être obtenus en polymérisant du styrène en présence d~au moins un initiateur multifonctionnel qui est trifonctionnel ou tétrafonctionnel et au moins un initiateur à fonctionnalité inférieure qui est difonctionnel ou monofonctionnel. Ces polymères peuvent avoir une Mz accrue, une MFI accrue, et une MWD accrue. Eventuellement, la résine peut comprendre au moins un agent de transfert de chaîne, au moins un agent de réticulation et/ou un copolymère séquencé diène-styrène conjugué au styrène. La présence de l~initiateur multifonctionnel tend à créer plus de structures ramifiées dans le polystyrène.

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