Multilayer films, and articles made therefrom

Patent metadata

Field	Value
Publication number	US-11065848-B2
Application number	US-201615750357-A
Country	US
Kind code	B2
Filing date	Aug 30, 2016
Priority date	Sep 10, 2015
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A multilayer film including a core layer and two skin layers, wherein the core layer is positioned between the two skin layers, wherein the core layer includes a polyethylene composition including a high density polyethylene having a density of 0.930-0.965 g/cc and a melt index of 0.7-10.0 g/10 min, and wherein each skin layer independently includes a polypropylene composition including greater than 50 wt. %, based on the total weight of the polypropylene composition, of a propylene-based polymer.

First claim

We claim:

1. A multilayer film comprising:
a core layer and two skin layers;
wherein the core layer is positioned between the two skin layers;
wherein the core layer comprises a polyethylene composition comprising a high density polyethylene having a density of 0.930-0.955 g/cc and a melt index of 0.7-10.0 g/10 min and from 5 to 15%, by weight of the polyethylene composition, a low density polyethylene having a density of about 0.915-0.935 g/cc and a melt index of 0.2-15 g/10 min, wherein the polyethylene composition has an overall density of about 0.940-0.955 g/cc; and
wherein each skin layer independently comprises a polypropylene composition comprising greater than 50 wt. %, based on the total weight of the polypropylene composition, of a propylene-based polymer and from 5 wt. % to 30 wt. % of a low density polyethylene, wherein the propylene-based polymer is a combination of a polypropylene homopolymer and a propylene-based elastomer or plastomer.

2. The film of claim 1 , wherein the polyethylene composition has a a melt index of about 1.0-8.0 g/10 min.

3. The film of claim 1 , wherein the core layer comprises from about 50% to about 85% of the overall film thickness.

4. The film of claim 1 , wherein the two skin layers have an equal thickness.

5. The film of claim 1 , wherein the film exhibits at least one of the following properties:
a spencer dart impact strength of greater than 140 g;
a 2% secant modulus of greater than about 20,000 psi in the machine direction and greater than 20,000 psi in the cross direction;
a stress at break in the cross-direction of greater than about 1,800 psi, and in the machine direction of greater than about 1,700 psi; or
a puncture resistance greater than about 13 ft·lb f /in 3 .

6. The film of claim 1 , wherein the film exhibits at least one of the following properties:
a softness value difference of less than 15%, when compared to a 100% polyethylene film having a 2% secant modulus of greater than about 16,000 psi in the machine direction; or
a noise value of less than 0.5 dB between a frequency band of 1,000 Hz and 5,000 Hz.

7. The film of claim 1 , wherein the film has a basis weight of between about 8-30 gsm.

8. An ultrasonically bonded laminate comprising:
the multilayer film according to claim 1 ; and
a nonwoven substrate at least partially ultrasonically bonded to the multilayer film to form a laminate.

Assignees

• Dow Quim Mexicana S A De C V
• Dow Global Technologies Llc

Inventors

• Arteaga Larios Fabricio
• Degroot Jacquelyn A
• Kalihari Vivek

Classifications

• B32B2555/00

  Personal care · CPC title

• B32B2555/02

  Diapers or napkins · CPC title

• B32B2307/581

  Resistant to cut · CPC title

• B32B2307/54

  Yield strength; Tensile strength · CPC title

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title