Conversion of alpha-methylstyrene-type monomers in the formation of copolymers with conjugated diene monomers
US4246372A · kind A · utility
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Key dates
| Filing date | May 4, 1979 |
| Grant date | Jan 20, 1981 |
| Priority date | — |
| Expiry date | May 4, 1999 |
Classification
- Technology area (CPC —)General
Abstract
Copolymers of alpha-methylstyrene-type monomers and conjugated diene monomers are prepared by polymerizing an alpha-methylstyrene monomer using a first polar activator, adding a small amount of a conjugated diene monomer to cap the block of alpha-methylstyrene-type monomer polymer, and further adding a conjugated diene monomer and polymerizing with a second polar activator effective for copolymerization of residual alpha-methylstyrene-type monomer. The resulting copolymer can be coupled to form linear or radial block copolymers.
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