C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
400/3047
C08J 3/22 (2006.01) C08J 3/00 (2006.01) C08L 25/06 (2006.01) C08L 53/02 (2006.01) C08L 21/00 (2006.01)
Patent
CA 1100670
A B S T R A C T A composition is obtained by a process including mixing polystyrene with a master batch composition containing a mixture of a vinyl aromatic polymer, a rubbery dienic polymer and a sequenced copolymer of styrene and diene, the total styrene polymer content of this master batch composition including both the free polystyrene and the polystyrene present in the sequenced copolymer, being between 50 and 80% by weight of the composition, the total rubber content of this master batch composition, including both the rubbery dienic polymer and the dienic polymer present in the sequenced copolymer being between 20 and 50% by weight of the composition, the sequenced copolymer content being such that it introduces from 3 to 90% by weight of the total rubber in the composition, the total percent rubber content of said master batch composition being at least 1.5 times the total percent rubber content of the final composition. Simplified processing is achieved by this master batch technique which enables simple mechanical mixing of the three specific ingredients and the simple mixing of polystyrene with the master batch, thus elimin- ating the need for complicated and sensitive latex or mass polymerization techniques. The resultant compositions have improved impact properties as high impact poly- styrenes for molded plastic materials.
263923
Bertrand Jean N. M.
Bracke William J. I.
Zegers Jacques T. L.
Gowling Lafleur Henderson Llp
Labofina S.a.
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