Process for the manufacture of a composition comprising a vinylaromatic polymer and a rubber by polymerization in the presence of a stable free radical
US6262179A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 1996 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | Feb 6, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F279/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the manufacture of a composition comprising a vinylaromatic polymer and a rubber, wherein the polymerization stage is carried out in the presence of a stable free radical in a polymerization mixture. The presence of the stable free radical in the polymerization mixture makes its possible to increase the melt index and to influence the size of the rubber nodules in the final composition by generally increasing the fraction, by volume, of the rubbery phase and by widening the distribution of the size of these nodules. This is reflected by an improvement both in the melt index and in the impact strength of the final composition, which makes the latter an ideal composition for injection molding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.