Branched copolymer pressure sensitive hot melt adhesive
AssigneeH. B. Fuller Licensing & Financing, Inc.
InventorCarolyn M. Anderson
Life of this patent
Estimating the term…
Abstract
An improved hot melt, pressure sensitive adhesive. The adhesive has a unique combination of excellent heat stability and higher tack. The adhesive is utilized in disposable articles such as diapers and sanitary napkins. The adhesive employs a saturated A-B-A block copolymer such as S-EB-S or S-EP-S with B or C side chains such as isoprene or ethylene-propylene.
Claims6
A hot melt, pressure sensitive adhesive composition comprising:
- (a) about 5 to about 30 percent by weight of a first block copolymer comprising a substantially saturated A-B-A block copolymer having B or C side chains wherein A is polystyrene, B is selected from the group consisting of ethylene-propylene, ethylene-butylene and mixtures thereof, and C is selected from the group consisting of isoprene, butadiene, and mixtures thereof;
- (b) about 3 to about 10 percent by weight of a second block copolymer selected from the group consisting of styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer and mixtures thereof;
- (c) about 10 to 50 percent by weight of a plasticizer;
- and
- (d) 0 to 65 percent by weight of a solid tackifying agent.
A disposable article selected from the group consisting of disposable diapers, sanitary napkins, bed pads, incontinent pads, surgical drapes, wherein said article comprises an adhesive composition comprising:
- (a) about 5 to about 30 percent by weight of a first block copolymer comprising a substantially saturated A-B-A block copolymer having B or C side chains wherein A is polystyrene. B is selected from the group consisting of ethylene-propylene, ethylene-butylene and mixtures thereof, and C is selected from the group consisting of isoprene, butadiene, and mixtures thereof;
- (b) about 3 to about 10 percent by weight of a second block copolymer selected from the group consisting of styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer and mixtures thereof;
- (c) about 10 to 50 percent by weight of a plasticizer;
- and
- (d) 0 to about 85 percent by weight of a solid tackifying agent.
Dependencies are inferred from the claim text.