Polystyrene-polyisoprene-polystyrene block copolymers, hot melt

Details Polystyrene-polyisoprene-polystyrene block copolymers, hot melt Polystyrene-polyisoprene-polystyrene block copolymers, hot melt

1989-08-11

1992-09-01

Davis, Jenna L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

428349, 428355, 525 98, 525314, C08L 906

Patent

active

051439689

ABSTRACT:
Polystyrene-polyisoprene-polystyrene block copolymers, hot-melt adhesive compositions constituted of polystyrene-polyisoprene-polystyrene block copolymers, and articles of manufacture produced therefrom. These copolymers possess blocks of high average molecular weight polystyrene (12,000 to 20,000) and low overall average molecular weight (60,000 to 110,000) such that when blended in requisite proportions with a compatible tackifier resin, preferably also a secondary tackifying resin or plasticizing oil, and stabilizer, superior hot-melt adhesive compositions can be formed. The hot-melt adhesive compositions possess, inter alia, superior heat resistance, superior static time to failure with low viscosity, good peel adhesion, good tack, and high ability to bond to a polyethylene or polypropylene substrate at temperatures below that which may damage the substrate.

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patent: 4997709 (1991-03-01), Huddleston

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