Production of haze-free block copolymers
US6281327A · kind A · utility
1Cited by
3References
11Claims
0Family size
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Inventor
Key dates
| Filing date | Jun 7, 2000 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Jun 7, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing a vinyl aromatic-conjugated diene block copolymer, the process comprising solution polymerising at least one vinyl aromatic hydrocarbon and a conjugated diene in the presence of a catalyst based on an alkali metal to produce copolymer chains which end with an alkali metal and treating the copolymer chains in solution with an alkyl dicarboxylic acid having at least 2 carbon atoms and the acid being in the form of a slurry in an organic liquid with the acid being granulated and having an average granule size of less than 50 microns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.