Branched block, copolymer, procedures for its preparation and us

Details Branched block, copolymer, procedures for its preparation and us Branched block, copolymer, procedures for its preparation and us

1993-04-28

1994-05-24

Seidleck, James J.

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

Synthetic resins

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

525 95, 525 98, 525314, 525250, C08L 5302, C08F29704

Patent

active

053149513

ABSTRACT:
A branched block copolymer is described, which can be defined by the formula (B.sub.1 --T--A--B.sub.2).sub.n X, where B.sub.1 and B.sub.2 are polydiene blocks, A is an aromatic polyvinyl block, T is a random copolymer segment made up of dienic monomeric and aromatic vinyl units, X is a coupling radical having a valence equal to n, and n is a whole number ranging from 3 to 20.
This kind of block copolymer is used in formulations of adhesives having an excellent balance of adhesive, cohesive, rheological characteristics, as well as resistance to heat oxidation, and in compositions together with thermoplastic polymers capable of giving products with improved shock resistance and transparency.

REFERENCES:
patent: 3644588 (1972-02-01), Hassell
patent: 4153647 (1979-05-01), Glukhovskoi et al.
patent: 4524184 (1985-06-01), Murray
patent: 4874821 (1989-10-01), Agostinis et al.
patent: 5079296 (1992-01-01), Thompson et al.
patent: 5164455 (1992-11-01), Agostinis et al.

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