Disposable pull-on diaper having a low force, slow recovery elastic waist
A disposable pull-on diaper having a wearer-facing surface and a garment-facing surface; a longitudinal centerline and a lateral centerline; a front waist region, a back waist region, and a crotch region disposed between the front and back waist regions. The front waist region and back waist region of the pull-on diaper interconnect to form a waist opening and leg openings. The pull-on diaper includes an absorbent assembly and an elastic belt. The absorbent assembly includes a liquid pervious topsheet, a liquid impervious backsheet, and an absorbent core disposed between the topsheet and backsheet. The elastic belt may exhibit less than about 80% of the maximum force after 15 seconds as measured by the Percent Release Test.
1. A disposable pull-on diaper having a wearer-faceable surface; a longitudinal centerline and a lateral centerline; a front waist region, a back waist region, and a crotch region disposed between the front and back waist regions, wherein the front waist region and back waist region are joined to form a waist opening and leg openings; the pull-on diaper comprising an absorbent assembly and an elastic belt;
wherein the absorbent assembly comprises a liquid pervious topsheet, a liquid impervious backsheet, and an absorbent core disposed between the topsheet and backsheet;
wherein the elastic belt exhibits less than about 80% of the maximum force after 15 seconds as measured by the Percent Release Test;
wherein the elastic belt comprises a plurality of elastic strands that each include a slow recovery elastomer that are stretch bonded between the topsheet and the backsheet, the slow recovery elastomer comprising between about 40% and about 50% of a modifying resin; and
wherein the modifying resin raises a glass transition temperature of a soft phase of an elastomeric polymer.
2. The disposable pull-on diaper of claim 1 wherein the elastic belt exhibits less than about 50% of the maximum force after 15 seconds as measured by the Percent Release Test.
3. The disposable pull-on diaper of claim 1 wherein the elastic belt exhibits less than about 20% of the maximum force after 15 seconds as measured by the Percent Release Test.
4. The disposable pull-on diaper of claim 1 wherein the elastic belt exhibits less than about 90% of the maximum force after 45 seconds as measured by the Percent Release Test.
5. The disposable pull-on diaper of claim 1 wherein the elastic belt exhibits less than about 70% of the maximum force after 45 seconds as measured by the Percent Release Test.
6. The disposable pull-on diaper of claim 1 wherein the elastic belt exhibits less than about 55% of the maximum force after 45 seconds as measured by the Percent Release Test.
7. The disposable pull-on diaper of claim 1 wherein the elastic belt further exhibits a 30% Recovery Time of at least 0.1 second.
8. The disposable pull-on diaper of claim 1 wherein the elastic belt further exhibits a 30% Recovery Time of at least 1 second.
9. The disposable pull-on diaper of claim 1 wherein the elastic belt further exhibits a 30% Recovery Time of at least 5 seconds.
10. The disposable pull-on diaper of claim 1 wherein the elastic belt further exhibits a 30% Recovery Time of at least 10 seconds.
11. The disposable pull-on diaper of claim 1 wherein the elastic belt exhibits a recovery speed of less than about 508 mm/min.
12. The disposable pull-on diaper of claim 1 wherein the elastic belt further exhibits a maximum normalized force of at least about 0.15 N/cm as measured by the Percent Release Test.
13. The disposable pull-on diaper of claim 1 wherein the elastic belt further exhibits at least about 30% release after 180 seconds as measured by the Percent Release Test.
14. The disposable pull-on diaper of claim 1 wherein the elastic belt further exhibits at least about 60% release after 180 seconds as measured by the Percent Release Test.
15. The disposable pull-on diaper of claim 1 wherein the elastic belt further exhibits at least about 90% release after 180 seconds as measured by the Percent Release Test.
16. The disposable pull-on diaper of claim 1 wherein the slow recovery elastomer includes an elastomeric polymer selected from the group consisting of styrenic block copolymers, natural and synthetic rubbers, polyisoprene, neoprene, polyurethanes, silicone rubbers, hydrocarbon elastomers, ionomers, and combinations thereof.
17. The disposable pull-on diaper of claim 16 wherein the elastomeric polymer is a block copolymer comprising a soft block and at least one substantially hard block.
18. The disposable pull-on diaper of claim 1 wherein the modifying resin is selected from the group consisting of unhydrogenated C5 hydrocarbon resins; C9 hydrocarbon resins; partially and fully hydrogenated C5 hydrocarbon resins; C9 hydrocarbon resins; cycloaliphatic resins; terpene resins; poly(t-butylstyrene) and oligomers thereof; rosin and rosin derivatives; coumarone indenes; polycyclopentadiene and oligomers thereof; phenolic resins; indene polymers, oligomers and copolymers; acrylate and methacrylate oligomers, polymers, and copolymers; and combinations thereof.
19. The disposable pull-on diaper of claim 1 wherein the slow recovery elastomer exhibits at least about 20% post elongation strain after 15 seconds of recovery at 22° C.