Conversion of alpha-methylstyrene-type monomers in the formation

Details Conversion of alpha-methylstyrene-type monomers in the formation Conversion of alpha-methylstyrene-type monomers in the formation

1981-06-29

1982-10-05

Hamrock, William F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C08F29700, C08F29704

Patent

active

043529127

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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Whitby-Synthetic Rubber, pp. 746-747 (Wiley) 1954.
Karoly "An Alpha-Methylstyrene Isoprene Block Copolymer" Div. Poly. Chem., Poly. Reprints vol. 10, #2, pp. 837-842.

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