Process for preparing high impact monovinylaromatic polymers in the presence of a borane complex
US8399561B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 21, 2008 |
| Grant date | Mar 19, 2013 |
| Priority date | — |
| Expiry date | Oct 28, 2028 |
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 preparing a high impact monovinylaromatic polymer comprising admixing a rubber, at least one monovinylaromatic monomer and optionally one or more comonomer in the presence of at least a borane complex of the L-BH3 type wherein L is a Lewis base and polymerizing the monovinylaromatic monomer.The borane complex initiator, L may be an ether (e.g THF, tetrahydrofurane), a thioether (e.g dimethylthioether) or an amine. A preferred complex is an amine borane such as by way of example triethylamine borane.The present invention also relates to a high impact monovinylaromatic polymer having a weight ratio of grafted monovinylaromatic monomer and optional comonomer to the initial monovinylaromatic monomer and optional comonomer above 0.1%, advantageously above 2% and preferably in the range 2 to 4%.The invention is of particular interest to make high impact polystyrene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.