2,5-substituted tetrahydrofurans as anionic initiator modifiers

Details 2,5-substituted tetrahydrofurans as anionic initiator modifiers 2,5-substituted tetrahydrofurans as anionic initiator modifiers

1993-10-22

1995-01-31

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526173, 526209, 525271, 525272, 525314, 502156, 502172, C08F 448, C08F29704

Patent

active

053859944

ABSTRACT:
A method for improving the initiation efficiency during the anionic polymerization of 15 to 100 percent weight of a vinyl aromatic hydrocarbon monomers and 0 to 85 percent by weight of a conjugated diene monomer by conducting the polymerization in the presence of a catalytically effective amount of: (a) an organolithium initiator and (b) a 2,5-substituted tetrahydrofuran modifier having the structural formula: ##STR1## wherein R.sub.1 and R.sub.1 ' are independently H or an alkyl group containing 1 to 4 carbon atoms and R.sub.2 and R.sub.2 ' are alkyl group containing 1 to 4 carbon atoms.

REFERENCES:
patent: 3301840 (1967-01-01), Zelinski
patent: 3847883 (1974-11-01), Kamienski et al.
patent: 4429091 (1984-01-01), Hall
patent: 5112929 (1992-05-01), Hall

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