Process for decolorizing of polymers of the vinylaromatic-conjugated diene type
US4877863A · kind A · utility
4Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1988 |
| Grant date | Oct 31, 1989 |
| Priority date | — |
| Expiry date | Sep 20, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Vinyl aromatic-conjugated diene copolymers having polymer chains which end with an alkali metal and which are obtained by the polymerization in solution of at least one vinyl aromatic hydrocarbon and of a conjugated diene in the presence of a catalyst based on an alkali metal are decolorized by treating the copolymer with a monocarboxylic acid of general formula EQU (Y).sub.2-n --X--(R--COOH).sub.n in which X is S, S--CH.sub.2 --S, or S--S, and Y and R are alkyl radicals having 1 to 16 carbon atoms and n is 1 or 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.