US 6,309,736 B1Granted

Low gauge films and film/nonwoven laminates

AssigneeKimberly-Clark Worldwide, Inc.

InventorsAnn Louise McCormack, Kevin George Hetzler, Karen Lynn English, Billy Ray Jones, Jr., Charles John Morell, Wiliam Bela Haffner, Glynis Allicia Walton, Lance James Garrett, Jr.

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

Disclosed herein is a low gauge, multilayer film which may be laminated to other materials such as, for example, fibrous nonwoven webs. The multilayer film may include one or more skin layers which in certain configurations comprise no more than about 15 percent of the overall thickness and in other configurations no more than about 10 percent of the overall thickness of the multilayer film. Such films and laminates have a wide variety of uses including, but not limited to, personal care absorbent products, articles of clothing and health care related items such as surgical drapes and gowns.

Claims32

Dependent claims

A breathable multilayer film, comprising:

a microporous breathable core layer, said core layer comprising an extrudable thermoplastic polymer and from about 40% to about 70% by weight filler and having a first exterior surface and a second exterior surface;
a first breathable skin layer attached to said first exterior surface of said core layer, said first skin layer comprising an extrudable thermoplastic polymer composition comprising from zero to 70% by weight of a first polvolefin and from 30% to 70% of a polymer selected from the group consisting of ethylene vinyl acetate, ethylene ethyl acrylate, ethylene methyl acrylate, ethylene butyl acrylate, ethylene acrylic acid, ethylene vinyl alcohol, polyester, nylon, polystyrene, polyurethane, and olefinic thermoplastic elastomers, wherein said first skin layer has a thickness less than about 2 microns;
and
wherein said multilayer film has a total thickness less than 30 microns and an overall WVTR of at least 800 g/m2/day and further wherein said multilayer film is liquid impermeable.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 08/882,712Filed 25 Jun 1997 · continuation in part
Priority: 20 Dec 1994
Granted: 30 Oct 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification47 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
A41D 31/145
Air permeable, i.e. capable of being penetrated by gases: using layered materials
A61F 13/15203
Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor;…:…
A61F 13/15699
Apparatus or processes for manufacturing: forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or…

Family

Application08/359,986Parent of this continuation · filed 20 Dec 1994
Application08/724,435Parent of this continuation-in-part · filed 1 Oct 1996
US 6,075,179 AParent of this continuation-in-part
Application08/724,435Parent of this continuation
US 6,309,736 B1This patent

From the US filing history. Foreign family members aren’t listed.