C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3047
C08L 51/06 (2006.01) C08L 53/00 (2006.01)
Patent
CA 1197939
IMPROVED HEAT RESISTANT HIGH IMPACT POLYMER COMPOSITIONS AND METHOD OF MAKING SAME ABSTRACT OF THE DISCLOSURE A styrenic copolymer composition having increased resistance to heat, markedly improved impact resistance and excellent processability for injection molding, extrusion, thermal formability and the like is made by the polymeriza- tion of a vinyl aromatic monomer and an ethylenically un- saturated dicarboxylic acid moiety in the presence of at least two different rubbery additives. At least one, but not all of the rubbery additives consists of a copolymer of from 40 to 95% by weight of a vinyl aromatic monomer and 5 to 60% by weight of a conjugated diene monomer. This admixture permits addition of up to about 40% or more by weight of the total product of the rubbery additives. The properties achieved offer an attractive balance found only in higher priced engineering polymer materials. The poly- merization process is preferably continuous and of the free radical type. It is significant that the process affords energy conservation, even though it is adapted to handling higher concentrations of rubbery additives than hitherto found possible.
390900
Lordi Frank E.
Triplett Jacob
Atlantic Richfield Company
Osler Hoskin & Harcourt Llp
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