Prepolymerization process for producing a conjugated diene compo

Details Prepolymerization process for producing a conjugated diene compo Prepolymerization process for producing a conjugated diene compo

1990-08-31

1992-03-17

Bleutge, John C.

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

Synthetic resins

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

525269, 525316, 526 86, 526114, 526122, 526133, 526153, 526157, C08F23610, C08F 412

Patent

active

050969706

ABSTRACT:
A conjugated diene compound prepolymer solution useful for the production of a vinyl aromatic compound high impact polymer material is produced by a process in which a prepolymerization mixture is prepared from 1 to 70 parts by weight of a conjugated diene compound and 30 to 99 parts by weight of a vinyl aromatic compound, and is prepolymerized at 0.degree. C. to 150.degree. C. in the presence of a prepolymerization catalyst which can cause the conjugated diene compound to be selectively polymerized but is substantially not effective for the polymerization of the vinyl aromatic compound to an extent such that the conjugated diene compound and the vinyl aromatic compound are prepolymerized at degrees of conversion of the conjugated diene compound at least 50% and 10% or less, respectively, and the resultant prepolymer solution is further polymerized by a radical or anionic polymerization method so that the vinyl aromatic compound is polymerized with the conjugated diene compound prepolymer.

REFERENCES:
patent: 3299178 (1967-01-01), Short et al.
patent: 3644587 (1972-02-01), Finberg
patent: 4429089 (1984-01-01), Pedretti
patent: 4575538 (1986-03-01), Hsieh
Chemical Abstracts, vol. 103, 1985, No. 103:105820r, "Impact Modifiers for Styrene Polymers", p. 38.

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