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US 6,774,069 B2Granted
Hot-melt adhesive for non-woven elastic composite bonding
AssigneeKimberly-Clark Worldwide, Inc.
InventorsPeiguang Zhou, Lance J. Garrett, Jr.
Life of this patent
Estimating the term…
Abstract
Hot-melt adhesive compositions of atactic polypropylene and isotactic polypropylene are particularly suitable for bonding non-woven elastic composites. A selected amount of isotactic polypropylene is blended with a selected amount of atactic polypropylene to prepare an adhesive composition having one or more performance properties (e.g., bond strength) that are superior to the performance properties of conventional hot-melt adhesives.
Claims70
A laminated structure comprising:
- a non-woven substrate;
- at least one elastic strand;
- and
- a hot-melt adhesive composition bonding the non-woven substrate and the at least one elastic strand to one another, wherein the adhesive composition includes between about 50 and about 90 weight percent atactic polypropylene having a degree of crystallinity of less than about 20% and a number-average molecular weight between about 500 and about 40,000, and between about 5 and about 50 weight percent isotactic polypropylene having a degree of crystallinity of at least about 40% and a number-average molecular weight between about 3,000 and about 150,000, wherein the adhesive composition has a melt index between about 200 and about 1800 grams per 10 minutes and is hot-melt processable at less than about 450 degrees Fahrenheit.
1 more element
A laminated structure comprising:
- a first non-woven elastic substrate;
- a second non-woven substrate;
- and
- a hot-melt adhesive composition bonding the first non-woven elastic substrate and the second non-woven substrate to one another, wherein the adhesive composition includes between about 50 and about 90 weight percent atactic polypropylene having a degree of crystallinity of less than about 20% and a number-average molecular weight between about 500 and about 40,000, and between about 5 and about 50 weight percent isotactic polypropylene having a degree of crystallinity of at least about 40% and a number-average molecular weight between about 3,000 and about 150,000, wherein the adhesive composition has a melt index between about 200 and about 1800 grams per 10 minutes and is hot-melt processable at less than about 450 degrees Fahrenheit.
1 more element
An absorbent article comprising:
- a first elastomeric substrate;
- a second substrate;
- and
- a hot-melt adhesive composition bonding the first substrate and the second substrate to one another, wherein the adhesive composition includes between about 50 and about 90 weight percent of an atactic polypropylene having a degree of crystallinity of less than about 20% and a number-average molecular weight between about 500 and about 40,000, and between about 5 and about 50 weight percent of an isotactic polypropylene having a degree of crystallinity of at least about 40% and a number-average molecular weight between about 3,000 and about 150,000, wherein the adhesive composition has a melt index between about 200 and about 1800 grams per 10 minutes and is hot-melt processable at less than about 450 degrees Fahrenheit.
1 more element
Dependencies are inferred from the claim text.