Breathable Elastic Composite
This invention concerns an elastic multilayer composite, comprising a non-elastic film layer and an elastic nonwoven layer. This invention also concerns a process for manufacturing an elastic multilayer composite, comprising: forming the composite using a non-elastic film layer and an elastic nonwoven layer.
1 . An elastic multilayer composite, comprising a non-elastic film layer adjacent to an elastic nonwoven layer.
2 . The composite of claim 1 , wherein adhesive is between the non-elastic film layer and the elastic nonwoven layer.
3 . The composite of claim 1 , wherein the layers adhere to one another at a multiplicity of points, and wherein those bond points are formed via heat and pressure.
4 . The composite of claim 1 , wherein the elastic nonwoven layer is a spunbonded fabric.
5 . The composite of claim 1 , wherein the elastic nonwoven layer is formed of bicomponent fibers, wherein the bicomponent fibers include an inner first component and an outer second component, wherein the first component is a thermoplastic elastomer, wherein the first component comprises at least 50% of the fibers, and wherein the second component is polyethylene, polypropylene, or a blend of polyethylene and polypropylene.
6 . The composite of claim 1 , wherein the nonwoven layer is composed of bicomponent fibers having a sheath/core, multilobal, or tipped multilobal structure.
7 . The composite of claim 1 , wherein the nonwoven layer is composed of bicomponent fibers which have not been activated.
8 . The composite of claim 1 , wherein the nonwoven layer is composed of bicomponent fibers which have been stretch activated.
9 . The composite of claim 1 , wherein the composite has a two-layer structure.
10 . The composite of claim 1 , wherein the composite has a three-layer structure.
11 . The composite of claim 1 , wherein the entire composite is stretch activated.
12 . The composite of claim 1 , wherein the non-elastic film is breathable.
13 . The composite of claim 1 , wherein the non-elastic film is a multilayered film, a monolithic film, a cast film, a net, a foam, a scrim, or a non-woven, woven or knitted fabric.
14 . A process for manufacturing an elastic multilayer composite, comprising: forming a composite of at least non-elastic film layer and at least one elastic nonwoven layer.
15 . A process according to claim 14 whereby the laminate is formed using thermopoint bonding.
16 . A process according to claim 14 whereby the layers are formed using extrusion lamination.
17 . The process of claim 14 , wherein adhesive is between the non-elastic film layer and the elastic nonwoven layer.
18 . The process of claim 14 , wherein the elastic nonwoven is a spunbonded nonwoven.
19 . The process of claim 14 , wherein the elastic nonwoven layer is formed of bicomponent fibers, wherein the bicomponent fibers include an inner first component and an outer second component, wherein the first component is a thermoplastic elastomer, wherein the first component comprises at least 50% of the fibers, and wherein the second component is polyethylene, polypropylene, or a blend of polyethylene and polypropylene.
20 . The process of claim 14 , wherein the nonwoven layer is composed of bicomponent fibers having a sheath/core, multilobal, or tipped multilobal structure.
21 . The process of claims 14 , wherein the nonwoven layer is composed of bicomponent fibers which have not been activated.
22 . The process of claim 14 , wherein the nonwoven layer is composed of bicomponent fibers which have been stretch activated.
23 . The process of claim 14 , wherein the composite has a two-layer structure, not inclusive of an optional adhesive layer.
24 . The process of claim 14 , wherein the composite has a three-layer structure, not inclusive of two optional adhesive layers.
25 . The process of claim 14 , wherein the entire composite is stretch activated.
26 . The process of claim 14 , wherein the lamination is conducted using melt adhesive lamination.
27 . The process of claim 14 , wherein the lamination is conducted using extrusion lamination.
28 . The process of claim 14 , wherein the lamination is conducted at a plurality of spaced apart points using thermopoint bonding.
29 . The composite of claim 14 , wherein the elastic nonwoven layer has a tensile strength less than the tensile strength of the non-elastic film.
30 . The process of claim 16 , wherein the lamination is conducted at a plurality of spaced apart points using thermopoint bonding.
31 . The composite of claim 16 , wherein the elastic nonwoven layer has a tensile strength less than the tensile strength of the non-elastic film.
32 . The composite of claim 14 , wherein the nonelastic film is formed of a polymer of ethylene, propylene, butylene, pentene, hexene, heptene, and octene, as well as copolymers, terpolymers, and blends thereof, ethylene vinyl acetate (EVA), ethylene ethyl acrylate (EEA), ethylene acrylic acid (EAA), ethylene methyl acrylate (EMA), ethylene butyl acrylate, polyurethane, poly(ether-ester) and poly(amid-ether) block copolymers, and any combination thereof.
33 . The composite of any of claim 14 , wherein the elastic nonwoven layer is formed of bicomponent fibers, wherein the bicomponent fibers include an inner first component and an outer second component, wherein the second component is less elastic than the first component, wherein the first component is a thermoplastic elastomer, wherein the second component is present in the bicomponent fibers in between about 1 and about 20 percent.
34 . The composite of claim 14 , wherein the elastic nonwoven layer is formed of bicomponent fibers, wherein the bicomponent fibers include an inner first component and an outer second component, wherein the second component is less elastic than the first component, wherein the first component is a thermoplastic elastomer, wherein the first component is formed from a polyurethane, a block copolyester, a block copolyamide, a styrenic block polymer, a polyolefin elastomer, and combinations thereof.