Block copolymers having improved combinations of properties

Details Block copolymers having improved combinations of properties Block copolymers having improved combinations of properties

1995-11-06

1997-12-02

Warzel, Mark L.

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

Synthetic resins

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

525 89, 525250, 525271, 526173, 526174, C08F29704, C08L 5302

Patent

active

056937180

ABSTRACT:
Block copolymer compositions, comprising for a major part of linear triblock copolymers, comprising two terminal predominantly poly(monovinylaromatic) blocks having a real molecular weight in the range of from 5,000 to 25,000 and one predominantly poly(boutadiene) midblock, said triblock copolymer having a monovinylaromafic content in the range of from 10 to 55 wt %, an apparent total molecular weight in the range of from 15,000 to 300,000, and an amount of from 0 to 40 wt % of a diblock copolymer relative to the total block copolymer composition weight, containing a predominantly poly(monovinylaromatic) block and a predominantly poly(boutadiene) block similar to those of the triblock copolymer component; said block copolymer composition having a free poly(vinylaromatic) content of at most 7 wt %, and shaped articles derived from said block copolymer composition.

REFERENCES:
patent: 3819767 (1974-06-01), Shimomura et al.
patent: 3911054 (1975-10-01), Roest et al.
patent: 4163764 (1979-08-01), Nash
patent: 4260694 (1981-04-01), Schwab
patent: 5171800 (1992-12-01), Broustert
patent: 5405903 (1995-04-01), Van Westrenen et al.
Frank C. Jagisch and Jean M. Tancrede, New Styrene Block Copolymers for Tape and Label Use, pp. 8-24.
International Search Report dated Mar. 17, 1995.

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