Dissimilar arm asymmetric radical or star block copolymers for a

Details Dissimilar arm asymmetric radical or star block copolymers for a Dissimilar arm asymmetric radical or star block copolymers for a

1994-11-09

1996-01-23

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...

525 98, 428352, 428355, C08F29704

Patent

active

054865743

ABSTRACT:
Radial or star asymmetric block copolymer of the following formulae and an improved tape assembly using the copolymers and improved adhesive and sealant compositions containing them
(I) (A--HD).sub.x --Y--(UD).sub.z or (II) (UD--A--HD).sub.x --Y or (lII) ((UD).sub.y --A--HD).sub.x --Y-(UD).sub.z wherein A is a vinyl aromatic hydrocarbon block having a molecular weight of from 4000 to 20,000, HD is a hydrogenated conjugated diene block having a molecular weight of from 10,000 to 100,000, Y is a multifunctional coupling agent, UD is a partially hydrogenated conjugated diene block having a molecular weight of from 1000 to 80,000, x is an integer from 2 to 30, y is 0 or 1, z is an integer from 1 to 20, and x+z ranges from 3 to 30.

REFERENCES:
patent: 4163764 (1979-08-01), Nash
patent: 4346193 (1982-08-01), Warfel
patent: 4391949 (1983-07-01), St. Clair
patent: 4849481 (1989-07-01), Rhodes et al.
patent: 5001199 (1991-03-01), Hoxmeier
patent: 5149895 (1992-09-01), Coolbaugh et al.

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