Process for the preparation of industrially applicable difunctio

Details Process for the preparation of industrially applicable difunctio Process for the preparation of industrially applicable difunctio

1995-05-09

1996-09-10

Schofer, Joseph L.

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

Synthetic resins

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

525271, 526180, 526340, 526347, 502157, 260665R, C08F29704, C07F 102

Patent

active

055546960

ABSTRACT:
Process for the preparation of an efficient industrial .alpha., .omega.-dilithio poly(conjugated diene) diinitiator having a peak molecular weight in the range of from 1000 to 3000, comprising the reaction of mono-organolithium initiator with diisopropenyl benzene in an apolar hydrocarbon solvent, optionally in the presence of a tertiary amine, followed by addition to the reaction mixture of a small amount of conjugated diene monomer and at least 15 vol % of an aromatic ether activator at a temperature in the range of from 0.degree. to 30.degree. C.; the use of said .alpha., .omega.-dithio initiator for the manufacture of symmetrical block copolymers by anionic polymerization, from monovinylaromatic, conjugated diene and/or polar vinyl compound monomers; and block copolymers so obtained having a combination of a narrow molecular weight distribution (Mw/Mn.ltoreq.1.20) and relatively low vinyl content (.ltoreq.18%).

REFERENCES:
patent: 3903168 (1975-02-01), Foss et al.
patent: 4822530 (1989-04-01), Bronstart et al.
patent: 5393843 (1995-02-01), Handlin et al.
patent: 5462994 (1995-10-01), Lo et al.
patent: 5464914 (1995-11-01), Lo et al.

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