Granted Patent B2

US 11,135,335 · App. 15/901,240 · Granted Oct 5, 2021

Inventors: Iyad Muslet (West Chester, OH); Jerry Westerkamp (Loveland, OH)

Assignee: BERRY FILM PRODUCTS COMPANY, INC.

A61L15/225A61F13/4902A61F13/5116A61F13/51121A61F13/51401B32B7/12B32B27/00B32B27/08B32B27/302B32B27/32A61F2013/51147A61F2013/51409B32B2250/40B32B2307/732

Abstract

Claims (21)

1. A laminate comprising a substrate and a multilayer thermoplastic film, the multilayer thermoplastic film comprising an inner layer and two outer layers,

wherein the inner layer comprises a polymeric composition comprising (a) from about 55% to about 95% by weight of one or more non-hydrogenated styrenic block copolymers selected from the group consisting of SBS, SIS, and SIBS, and (b) an olefinic block copolymer;

and each outer layer comprises polypropylene and polyethylene, the polypropylene being at least 20% by weight and each outer layer has a thickness of from about 5% to about 15% of the total film thickness, and,

wherein the film has a constant force tear propagation of about 20% or less.

2. The laminate of claim 1 , wherein the non-hydrogenated styrenic block copolymers are present in an amount of from about 60% to about 90% by weight.

3. The laminate of claim 1 , wherein the thickness of each outer layer of the film is from about 1 micron to about 15 microns.

4. The laminate of claim 1 , wherein the film has a basis weight of from about 20 gsm to about 55 gsm.

5. The laminate of claim 1 , wherein the has a permanent set of less than about 8%.

6. The laminate of claim 1 , wherein the film has a machine-direction load at 10% strain of at least 3.5 N/cm.

7. The laminate of claim 1 , wherein the polymeric composition of the film further comprises a polypropylene-rich polymer.

8. The laminate of claim 1 , wherein each outer layer comprises from about 10% to about 50% by weight of LLDPE.

9. The laminate of claim 1 , wherein each outer layer comprises from about 10% to about 15% by weight of LDPE.

10. The laminate of claim 1 , wherein the polypropylene in each outer layer is present in an amount of from about 25% to about 80% by weight.

11. The laminate of claim 1 , wherein the laminate comprises bond sites throughout substantially the entire surface of the laminate.

12. The laminate of claim 11 , wherein the bond sites are ultrasonically-bonded sites.

13. The laminate of claim 1 , wherein the laminate comprises bond sites in at least one ultrasonically-bonded zone.

14. The laminate of claim 13 , wherein the width of each ultrasonically-bonded zone is from about 1 mm to about 5 mm.

15. The laminate of claim 13 , wherein the total width of the ultrasonically-bonded zones comprises from about 2% to about 8% of the width of the film.

16. The laminate of claim 13 , wherein the ultrasonically-bonded zone is in a tack-down region.

17. An absorbent article comprising the laminate of claim 1 .

18. The laminate of claim 1 , wherein each outer layer of the film comprises (i) 30% to 80% by weight polypropylene, (ii) LDPE, and (iii) LLDPE, and the inner layer comprises from about 60% to about 90% by weight non-hydrogenated styrenic block copolymers.

Assignments (40)