Disposable article hot melt adhesive
AssigneeAdherent Laboratories, Inc.
InventorsWilliam L. Bunnelle, Thomas H. Quinn
Life of this patent
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Abstract
A hot melt adhesive comprises an ethylene α-olefin copolymer, an acid anhydride modified polyolefin and a hydrogenated tackifying resin. The hot melt adhesive has excellent viscoelastic properties and can be used in a variety of applications. In one application, attaching an elastic band to a flexible film, the adhesive has excellent viscosity and, in a finished absorbent article, a minimal creep characteristic. Also disclosed is a disposable article using the adhesive to adhere adjacent surfaces within the disposable article including an elastic band to a polyolefin backing film, for example, in a diaper, incontinent article or other such structure.
Claims123
A hot melt adhesive, compounded for elastic attachment to a substrate, the adhesive comprising:
- (a) an effective amount of an ethylene α-olefin copolymer having a melt index greater than about 800 g-10 min−1 and density less than about 0.89 g-cm2;
- (b) about 0.05 to about 35 wt % of a polyethylene polymer having randomly oriented substituents comprising an acid anhydride group, wherein the amount of acid anhydride is characterized by a saponification number of about 0.05 to about 15, the polyethylene polymer having a molecular weight Mn of about 2000 to about 10,000;
- and
- (c) about 30 to 80 wt % of a hydrogenated tackifier,
- wherein the hot melt adhesive has a Brookfield viscosity at 150° C. of about 2000 to about 16000 cP and a creep less than about 70%.
A method of applying a hot melt adhesive onto a substrate, the method comprising applying to a substrate a formulation comprising:
- (a) an effective amount of an ethylene α-olefin copolymer having a melt index greater than about 800 g-10 min−1 and density less than about 0.89 g-cm2.
- (b) about 0.05 to about 35 wt % of a polyethylene polymer having randomly oriented substituents comprising an acid anhydride group, wherein the amount of acid anhydride is characterized by a saponification number of about 0.05 to about 15, the polyethylene polymer having a molecular weight Mn of about 2000 to about 10,000;
- and
- (c) about 30 to 80 wt % of a hydrogenated tackifier,
- wherein the hot melt adhesive has a Brookfield viscosity at 150° C. of about 2000 to about 16000 cP and a creep of less than about 70%.
A disposable article, selected from the group consisting of a diaper, an adult incontinent diaper, and a bed pad, the article comprising a polymer film and an elastic wherein the film and elastic are joined by an adhesive layer positioned between the elastic and the film, the adhesive layer comprising a hot melt adhesive comprising:
- (a) an effective amount of an ethylene α-olefin polymer having a melt index greater than about 800 g-10 min−1 and density less than about 0.89 g-cm2;
- (b) about 0.05 to about 35 wt % of a polyethylene polymer having randomly oriented substituents comprising an acid anhydride group, wherein the amount of acid anhydride is characterized by a saponification number of about 0.05 to about 15, the polyethylene polymer having a molecular weight Mn of about 2000 to about 10,000;
- and
- (c) about 40 to 60 wt % of a hydrogenated tackifier,
- wherein the hot melt adhesive has a Brookfield viscosity 150° C. of about 2000 to about 16000 cP and a creep less than about 70%.
Dependencies are inferred from the claim text.