Tapered block copolymers

Details Tapered block copolymers Tapered block copolymers

1991-11-26

1993-08-10

Michl, Paul R.

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

Synthetic resins

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

C08F 832

Patent

active

052349993

ABSTRACT:
Disclosed are bituminous blends having improved toughness and elasticity. The blends contain a bituminous binder and a tapered block copolymer formed from a monovinyl aromatic compound and a conjugated diene. Suitable tapered block copolymers include a tapered A-B-A type block copolymer of the A-t-B-t-A configuration, particularly those having an isolated monovinyl aromatic compound content of about 20 to about 90 weight percent, and tapered A-B-A type block copolymers of the A-B-t-A configuration having an isolated monovinyl aromatic compound content of about 20 to about 90 weight percent of the total monovinyl aromatic compound in the tapered block copolymer. Further disclosed is a method of making the blends. Further disclosed is a tapered A-B-A type block copolymer having an isolated monovinyl aromatic compound content of about 29 to about 75 weight percent.

REFERENCES:
patent: 3947536 (1976-03-01), Horiie et al.
patent: 4960842 (1990-10-01), Lo et al.
patent: 5013790 (1991-05-01), Tung et al.
patent: 5047484 (1991-09-01), Tung
patent: 5071920 (1991-12-01), Tung
J. McGrath, Anionic Polymerization, Kinetics, Mechanisms and Synthesis ACS Symposium Series 166, 397-400 (1981).

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