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US 8,465,844 B2Granted
Elastic attachment adhesive containing radial block copolymer
AssigneeHenkel AG & Co. KGaA
InventorsQiwei He, Michael G. Harwell
Life of this patent
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Abstract
Hot melt adhesive compositions containing radial polystyrene-polyisoprene/polybutadiene block copolymer and use as elastic attachment adhesive in the manufacture of disposable absorbent elastic articles.
Claims10
An elastic attachment hot melt adhesive comprising:
- (1) 15 wt % to about 35 wt % of a radial block copolymer component comprising (PS-PI- PB) nX wherein PS is polystyrene, PI is polyisoprene and PB is polybutadiene, X is the residue of a multifunctional coupling agent used in the production of the radial block copolymer, and n is equal to or greater than 3 and represents the number of PS-PI-PB arms appended to X,
- said radial block copolymer having a styrene content of from 25 wt % to about 50wt %,
- said radial block copolymer has a di-block percentage of less than about 25%, based on the amount of the radial block copolymer, and
- the number average molecular weight of each arm of said radial block copolymer is from about 30,000 to about 95,000;
- (2) about 1 wt% to about 6 wt% of a linear triblock copolymer selected from the group consisting of styrene-isoprene-styrene, styrene-butadiene-styrene and styrene-isobutylene styrene;
- and
- (3) about 30 wt% to about 70 wt % of a tackifying resin;
- wherein the wt% is based on the weight of the adhesive composition.
5 more elements
Dependencies are inferred from the claim text.