Resinous linear copolymers having blocks with a heterogeneity in

Details Resinous linear copolymers having blocks with a heterogeneity in Resinous linear copolymers having blocks with a heterogeneity in

1975-11-10

1978-03-21

Michl, Paul R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260876B, C08F29704

Patent

active

040804070

ABSTRACT:
A resinous linear block copolymer of a monovinyl substituted aromatic compound and a conjugated diene wherein the polymerized monovinyl substituted aromatic compound blocks have a heterogeneity index within the range of about 2.3 to 4.5. The heterogeneity index is the ratio of weight average to number average molecular weight. Such compositions exhibit high impact strength and can be made either by blending two linear block copolymers made under different conditions so as to give different lengths of the polymerized monovinyl substituted aromatic compound blocks, or by adding the monovinyl substituted aromatic compound and a polymerization initiator in two or more increments prior to adding the conjugated diene.

REFERENCES:
patent: 3281383 (1966-10-01), Zelinski
patent: 3507934 (1970-04-01), Minor
patent: 3560593 (1971-02-01), Hsieh
patent: 3639517 (1972-02-01), Kitchen
patent: 3954696 (1976-05-01), Roest

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