Increasing the reactivity of coupling of block polymers
US4399260A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 4, 1982 |
| Grant date | Aug 16, 1983 |
| Priority date | — |
| Expiry date | Jan 4, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F297/044
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is disclosed a process for the preparation of thermoplastic block polymers which comprises contacting conjugated diolefinic monomers selected from the group consisting of isoprene, piperylene, 2-ethyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene and 1,3-butadiene, and the like, mixed with at least one polyvinyl aromatic coupling compound selected from the group of o, m and p-divinylbenzene, 1,2,4-trivinylbenzene, 1,8-divinylnaphthalene, 1,2-divinyl-3,4-dimethylbenzene, 2,4-divinylbiphenyl, 3,5,4'-trivinylbiphenyl and 1,3,5-trivinylbenzene under solution polymerization conditions with a polystyryllithium catalyst which has been prepared by reacting an alkyllithium compound with a styrene monomer selected from the group consisting of styrene, alpha-methylstyrene, p-methylstyrene, p-t-butylstyrene, 3-methylstyrene, 1-vinylnaphthalene, and the like, in which an amount of polyvinyl aromatic coupling compound ranges from about 1.0 to about 6 vinyl groups of the polyvinyl aromatic coupling compound per mole of active lithium catalyst used, in which the living block copolymer is treated with (A) a polar compound selected from the group consisting of ethylene glycol dimethyl ether (glyme…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.