Non-aqueous dispersion polymerization of conjugated diolefins
US4098980A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1976 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Jun 24, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F287/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the non-aqueous dispersion polymerization of a conjugated diolefin monomer, for instance, butadiene or isoprene, in a liquid hydrocarbon dispersion medium, for instance, n-butane or n-pentane with a Ziegler Natta catalyst, for instance, triisobutylaluminum/titanium tetrachloride while said conjugated diolefin is in the presence of a block copolymer dispersion stabilizer. The block copolymer dispersion stabilizer is a copolymer which contains at least two blocks of polymer linked by chemical valences, at least one block (A block) is soluble in liquid organic dispersion medium and at least another block (B block) is insoluble in the dispersion medium and the stabilizer acts to disperse polymers of conjugated diolefins which are formed in the stabilizer's presence. The A block is exemplified by polyisoprene, poly(t-butyl styrene) and poly(vinyl toluene). The B block is exemplified by polystyrene, poly(.alpha.-methyl styrene), a copolymer of styrene and isoprene, poly(methyl methacrylate) and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.