Coupled block copolymers with improved tack for adhesives

Details Coupled block copolymers with improved tack for adhesives Coupled block copolymers with improved tack for adhesives

1977-06-23

1979-08-07

Michl, Paul R.

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

Synthetic resins

Ethylenically unsaturated reactant admixed with a preformed...

260 27BB, 525342, 525289, 525272, 525314, 525382, 525 93, 525122, 525123, 525153, 525154, 525359, 525386, C08F29704

Patent

active

041637640

ABSTRACT:
A monovinyl arene, such as styrene, is polymerized with a monofunctional lithium initiator, followed by addition of a conjugated diene, such as butadiene, with additional monofunctional lithium initiator. The resultant block copolymers are coupled to give linear coupled block copolymers or radial coupled block copolymers with a random distribution of homopolymer and copolymer branches. The polymers exhibit increased tack and improved creep resistance in adhesive compositions. The amount of initiator added as the second increment with the second monomer must be greater than the amount added as the first increment with the first monomer.

REFERENCES:
patent: 3352944 (1967-11-01), Wheat
patent: 3639517 (1972-02-01), Kitchen
patent: 3906057 (1975-09-01), Durst
patent: 3985830 (1976-09-01), Fetters
patent: 4051197 (1977-09-01), Fodor

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