Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1983-08-15
1984-12-04
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C08F27902
Patent
active
044865708
ABSTRACT:
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 polymerization of a vinyl aromatic monomer and an ethylenically unsaturated 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 polymerization 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.
REFERENCES:
patent: 4097550 (1978-06-01), Haaf
patent: 4269950 (1981-05-01), Abolins
Lordi Frank E.
Triplett Jacob
Atlantic Richfield Company
Kozak Dennis M.
Michl Paul R.
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