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Breathable elastic film/nonwoven laminate

An elastic film, non-woven layer technology, applied in non-woven fabrics, fabrics, textiles and papermaking, etc., can solve problems such as reducing film strength

Inactive Publication Date: 2000-06-28
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, these holes created during stretching can also reduce the film strength

Method used

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  • Breathable elastic film/nonwoven laminate
  • Breathable elastic film/nonwoven laminate
  • Breathable elastic film/nonwoven laminate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] One piece of unvulcanized Silastic® supplied by Dow Corning (Midland, Michigan)  The silicone rubber sheet is embossed with a pattern of large triangular dots. The triangular dots (window areas) covered 16% of the total film area, while the unembossed areas (frames) between the dots covered 84% of the total film area. The film is vulcanized in a heated oven to fix the embossed graphics. The thickness of the cured film was 19 mils in the bezel area; 3.2 mils in the window area; and a weight average of 16.1 mils.

[0088] The MVTR of the film, measured using ASTM E96-80 (upright cup method) with minor modifications as above, was found to be 249 g / m 2 -24 hours. Flat film of the same thickness (16.1 mils), according to Figure 5 Calculated by the formula derived from the data, the expected MVTR is only 127 g / m 2 -24 hours, the formula is as follows:

[0089] MVTR = 4700 × (thickness, mil) -1.3

[0090] From the same formula it can be predicted that a perfectly fla...

Embodiment 2

[0097] Hytrel at 1 mil unstretched thickness  8171 (polyetherester) film laminated to Arnitel with reactive polyurethane adhesive  (polyetherester) nonwoven meltblown web. The laminate was then sold under the trade name Super 77 by 3M Company.  Sold patented technology spray adhesive bonded to reversibly necked spunbond polypropylene material. Reversible necking materials are described in US Patents 4,981,747 and 4,965,122 to Morman, the disclosures of which are incorporated herein by reference. The web used had an original basis weight of 0.8 osy, was necked from a width of 17.75 inches to a width of 8.5 inches, and then heat set in the necked state. The resulting 3-layer laminate combines: outer cover softness contributed by the necked spunbond layer, good elasticity contributed by the polyetherester film and the meltblown layer, good overall film barrier properties contributed by the polyetherester film (by Measured by AATCC 127-89, confirmed by water head exceeding ...

Embodiment 3

[0099] The purpose of carrying out this example is to investigate the comparison of the breathable elastic polyurethane film with the prior art breathable microporous film in the barrier ability of ammonia odor. 2 typical dishes (cups) for the determination of MVTR (as described in the test procedure above), each partially filled with approximately 50 cc of a commercially available ammonia-based cleaner known as "Lemon Fresh Parsons Ammonia Universal detergent". 1 mil thick with Dow Affinity  A sample of PL-1845-based microporous polyolefin film was placed over a cup, which was then sealed. Dow Affinity  PL-1845 is based on metallocene catalyzed linear low density polyethylene (LLDPE). The LLDPE is converted to microporous by the following procedure: the resin is mixed with more than 50 wt% calcium carbonate filler, the two components are melt blended, the blend is extruded into a film, and the extruded film is uniaxially stretched . A 1 mil thick sample of breathable e...

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Abstract

A breathable elastic laminate is formed by bonding a film including an elastic water vapor-soluble polymer to a neckable nonwoven web such that when the film is relaxed, the web is in a necked state. The breathable laminate is stretchable in a direction parallel to the narrowing or necking of the web. The laminate possesses excellent water vapor permeability but acts as a barrier to the passage of odor-causing chemicals including ammonia.

Description

field of invention [0001] This invention relates to breathable elastic laminates consisting of films and nonwoven webs. The laminate is particularly useful as an outer cover for "disposable" diapers and other personal care disposable articles. The laminate can also be used in breathable surgical gowns and other breathable applications. Background of the invention [0002] Various types of vapor-permeable, liquid-impermeable polymer films are known in the art. One method of making vapor permeable polymer films involves mixing a base polymer with a substantial amount (e.g., 10 to 70 wt%) of an organic or inorganic particulate filler, such as calcium carbonate, and extruding from the blend for the film. The matrix polymer may comprise polyolefins, such as polyethylene or polypropylene, or various olefin copolymers. The film may be a single layer film, a multilayer film comprising a filled layer as the main layer and a thin air permeable outer surface layer or a multilayer f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A41D31/02A61F13/15B32B27/12D04H13/00
CPCD04H13/007A61F13/5148B32B27/12A61F13/51478Y10S428/91A61F13/51466A41D31/02A61F13/51462A61F2013/51429A61F2013/5149A61F2013/51417A61F2013/53925D04H3/14Y10T428/24826Y10T442/681Y10T442/674Y10T442/66Y10T442/679Y10T442/68A41D31/185A41D31/145D04H13/00B32B5/022B32B27/285B32B2262/0276B32B2262/0253B32B27/40B32B27/36B32B27/34B32B25/20B32B25/10B32B2307/724
Inventor M·T·莫尔曼L·J·莫甘B·科享
Owner KIMBERLY-CLARK WORLDWIDE INC
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