Composition comprising a vinylaromatic polymer and a rubber and process for obtaining it
AssigneeElf Atochem S. A.
InventorsTarek Sarraf, Thomas Edward Jenkins
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Abstract
The invention relates to polymer compositions of high impact strength, comprising a vinylaromatic polymer and a rubber, and to a process for their manufacture. These compositions are obtained by virtue of the use of two polybutadienes whose viscosities, measured at 25.degree. C. at a concentration of 5% in styrene, are, respectively, between 120 and 350 centipoises in the case of one and between 30 and 90 centipoises in the case of the other.
Claims27
Polymer composition comprising a vinylaromatic polymer and a rubber containing polybutadiene, wherein the rubber is derived from a high-viscosity polybutadiene and from a low-viscosity polybutadiene, the said high-viscosity polybutadiene exhibiting a linear structure, a cis- 1,4 structure content higher than 80% and a viscosity, measured at 25.degree. C. at a concentration of 5% by weight in styrene, ranging from 120 to 350 centipoises, and the said low-viscosity polybutadiene exhibiting a cis-1,4 structure content lower than 80% and a viscosity, measured at 25.degree. C. at a concentration of 5% by weight in styrene, ranging from 30 to 90 centipoises.
Process for the manufacture of a polymer composition comprising a vinylaromatic polymer and a rubber, comprising a stage of polymerization of at least one vinylaromatic monomer in the presence of a high-viscosity polybutadiene and of a low-viscosity polybutadiene and optionally of an organic solvent, wherein the high-viscosity polybutadiene exhibits a linear structure, a cis-1,4 structure content higher than 80% and a viscosity, measured at 25.degree. C. at a concentration of 5% in styrene, ranging from 120 to 350 centipoises, and the low-viscosity polybutadiene exhibits a cis-1,4 structure content lower than 80% and a viscosity, measured at 25.degree. C. at a concentration of 5% by weight in styrene, ranging from 30 to 90 centipoises.
Dependencies are inferred from the claim text.