Process for making high impact polymers from diene polymer and vinyl aromatics
US4098847A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1976 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Jun 7, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F279/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of high gloss, high impact vinyl aromatic hydrocarbons which process comprises (1) subjecting a solution of rubber and vinyl aromatic hydrocarbon monomer to mass polymerization conditions in the presence of a chain transfer agent for a period of 4 to 10 hours until the reaction mass reaches a viscosity of 1800 to 2000 cps., said chain transfer agent being introduced into the reaction mass in two portions, a first portion representing 50 to 90% of the total chain transfer agent to be present during the mass polymerization and being added to said solution at or before the beginning of said mass polymerization and a second portion representing 10 to 50% being added just prior to the end of said mass polymerization, (2) subjecting said reaction mass to suspension polymerization conditions and (3) recovering high impact polymeric vinyl aromatic hydrocarbons having improved high gloss characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.