Heat resistant high impact polymer compositions and method of making same
US4486570A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1983 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Aug 15, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F287/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.