Selective cyclization of block copolymers

Details Selective cyclization of block copolymers Selective cyclization of block copolymers

1979-08-27

1981-02-03

Levin, Stanford M.

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

Synthetic resins

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

260 304A, 260 336A, 260 338UA, 525106, 525153, 525184, 525330, 525333, 525371, C08F 848

Patent

active

042489865

ABSTRACT:
There is disclosed a process for selectively cyclizing block polymers which comprises reacting 1 to 30 percent by weight solution of a block copolymer comprised of at least two different blocks, at least one of which blocks is a cyclizable block derived from a conjugated diene monomer of the general structure ##STR1## wherein: R.sub.1 is selected from a hydrocarbyl group containing one to twelve carbon atoms, R.sub.2 is selected from hydrogen or a hydrocarbyl group containing one to twelve carbon atoms; and at least one of which blocks is a non-cyclizable block derived from at least one member selected from the following classes of compounds:

REFERENCES:
"Polymer Chem. of Synthetic Elastomers," Chapter 10, Kennedy and Tornquist, eds., (1969).

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