Stretch laminate, method of making, and absorbent article
A stretch laminate includes a first layer including an elastomer film, the first layer having a surface, and a second layer including a nonwoven material, the second layer having a surface that is attached to the surface of the first layer. The tensile behavior in the transverse direction of the stretch laminate is within about 2.5 N/cm of the tensile behavior in the transverse direction of the film at an engineering strain of about 1.5, and exists independent of mechanical activation. A method of making the stretch laminate and an absorbent article having at least one region defined by the stretch laminate are also provided.
1. A stretch laminate comprising:
(a) a first layer comprising an elastomer film, the first layer having a surface;
(b) a second layer comprising a nonwoven material, the second layer having a surface that is attached to the surface of the first layer; and
(c) a third layer comprising a nonwoven material, the third layer having a surface that is attached to the first layer on a surface opposite the second layer;
wherein the first, second and third layers are bonded together by an attachment mechanism selected from the group consisting of heat bonding, pressure bonding, ultrasonic bonding, dynamic mechanical bonding and combinations thereof; and
wherein the tensile behavior in the transverse direction of the stretch laminate is within about 2.5 N/cm of the tensile behavior in the transverse direction of the film at an engineering strain of about 1.5, and exists independent of mechanical activation.
2. The stretch laminate according to claim 1 , wherein the tensile behavior in the transverse direction of the stretch laminate is within about 1 N/cm of the tensile behavior in the transverse direction of the film at an engineering strain of about 1.5.
3. The stretch laminate according to claim 1 , wherein the laminate has an energy recovery value of 0.1 or higher for engineering strains between about 0.5 to about 2.5.
4. The stretch laminate according to claim 1 , wherein the film has an energy recovery value of 0.1 or higher for engineering strains between about 1.5 and about 2.5.
5. The stretch laminate according to claim 1 , wherein the attachment mechanism comprises ultrasonic bonding.
6. A method of making a stretch laminate, the method consisting essentially of:
(a) providing an elastomer film;
(b) attaching a first nonwoven layer to the elastomer film;
(c) attaching a second nonwoven layer to the elastomer film, the second layer being attached to the elastomer film on a surface opposite the first nonwoven layer;
wherein the attaching steps are accomplished via an attachment mechanism selected from the group consisting of heat bonding, pressure bonding, ultrasonic bonding, dynamic mechanical bonding and combinations thereof; and
wherein the tensile behavior in the transverse direction of the stretch laminate so made is within about 2.5 N/cm of the tensile behavior in the transverse direction of the film at an engineering strain of about 1.5, and exists independent of mechanical activation.
7. The method according to claim 6 , wherein the tensile behavior in the transverse direction of the stretch laminate is within about 1 N/cm of the tensile behavior in the transverse direction of the film at an engineering strain of about 1.5.
8. The method according to claim 6 , wherein the laminate has an energy recovery value of between 0.1 or greater for engineering strains between about 0.5 to about 2.5.
9. The method according to claim 6 , wherein the film has an energy recovery value of 0.1 or greater for engineering strains between about 1.5 and about 2.5.
10. An absorbent article having a waist region and a crotch region, the article comprising:
(a) a backsheet having a longitudinal axis;
(b) a topsheet attached to the backsheet and having a body-facing surface, the topsheet comprising porous foams, reticulated foams, apertured plastic films, or woven or nonwoven materials of natural fibers, synthetic fibers, or a combination of natural and synthetic fibers;
(c) an absorbent core disposed between the backsheet and the topsheet; and
(d) a stretch laminate according to claim 1 .
11. The absorbent article according to claim 10 , wherein the tensile behavior in the transverse direction of the stretch laminate is within about 1 N/cm of the tensile behavior in the transverse direction of the film at an engineering strain of about 1.5.
12. The absorbent article according to claim 10 , wherein the stretch laminate has an energy recovery value of 0.1 or higher for engineering strains between about 0.5 to about 2.5.
13. The absorbent article according to claim 10 , wherein the elastomer film has an energy recovery value of 0.1 or higher for engineering strains between about 1.5 and about 2.5.
14. The absorbent article according to claim 10 , wherein the waist region comprises the stretch laminate and the stretch laminate is attached to the backsheet.
15. The absorbent article according to claim 10 , wherein the waist region comprises a side flap and comprises the stretch laminate, and the stretch laminate is attached to the backsheet.
16. The absorbent article according to claim 15 , wherein a fastener is attached to the side flap.
17. The absorbent article according to claim 10 , wherein the waist region comprises a side panel and comprises the stretch laminate, and the stretch laminate is attached to the backsheet.
18. The absorbent article according to claim 10 , wherein the absorbent article is a diaper.
19. The absorbent article according to claim 10 , wherein the absorbent article is a pant.