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Stable and breathable film of improved toughness and method of making same

A thin film and microporous film technology, which is applied in the field of manufacturing this kind of film, can solve the problems of "aging" film strength and other issues

Inactive Publication Date: 2005-05-11
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Another manufacturing issue is the strength of "aged" films

Method used

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  • Stable and breathable film of improved toughness and method of making same
  • Stable and breathable film of improved toughness and method of making same
  • Stable and breathable film of improved toughness and method of making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0075] Eight resin compositions listed in Table I below were compounded. Films were formed and stretched on a machine direction orienter according to the conditions listed in Table I below.

[0076] film

[0077] film

[0078] film

[0079] film

[0080] film

[0081] The WVTR and transverse elongation at break properties of each stretched film were determined according to the following procedure. The results of these assays are listed in Table II below.

[0082] Stretching test

[0083] Films were determined according to Method 5102 Federal Test Method Standard No. 191A at maximum load ("CD Tensile Strength") and elongation at maximum load (in this case, the critical break in a direction 90° to both directions of orientation Elongation, "Critical CD Elongation at Break"). The sample size is 3 inches by 6 inches (2.54 cm by 15.24 cm), with the transverse direction of the sample running parallel to the 6 inch long side of the...

Embodiment 2

[0093] Laminates were prepared separately using Films A, G and H listed in Table I above. A sheet of absorbent material comprising polypropylene meltblown fibers mixed with pulp fibers, also known as a composite formed sheet, is placed under a shower head where hot melt is sprayed against the sheet at 350°F (176.7°C). A body adhesive, such as NS-5610 available from National Starch and Chemical Company of Bridgewater, NJ, is sprayed at a rate of about 2 grams per square meter. One of the above films was unwound from a roll and fed into a pair of nip rolls where the film was contacted with an absorbent sprayed with adhesive to form a laminate which was then wound into a roll. A 0.8 ounce per square yard (27.11 gsm) basis weight spunbond layer was then bonded to the film side of the laminate by the same hot melt lamination process. The WVTR of the three-layer laminate comprising each of the films was determined and compared to the WVTR of the film (by itself). The WVTR of the l...

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Abstract

The present invention relates to a uniaxially oriented microporous air-permeable film having excellent toughness in a direction perpendicular to the orientation direction. Such films include particulate fillers and a non-elastomeric material comprising ethylene and at least one C 4 -C 8 - Copolymers of alpha-olefin monomers, described in the industry as "ultra-tough", "next-generation materials", etc., and produced by "new" or "improved" catalyst systems or by metallocene or similar single-site catalysts. A method of manufacture is also disclosed.

Description

field of invention [0001] The present invention relates to the use of ethylene and at least one C 4 -C 8 - Breathable thermoplastic films of copolymers of alpha-olefins. Furthermore, the present invention relates to methods of making such films. Background of the invention [0002] The present invention is directed to breathable thermoplastic films. Such materials find widespread use, particularly in the area of ​​limited-use and disposable items. [0003] Traditionally, films have been used to provide barrier properties in limited-use or disposable items. Limited use or single use means that the product and / or components can only be used a few times or possibly only once before being discarded. Examples of such products include, but are not limited to, surgical and healthcare related products such as surgical drapes and laminates, disposable workwear such as coveralls and lab coats, and personal care absorbent products such as diapers, training pants, incontinence garm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61L15/18A61L15/22B32B27/32C08J5/18C08L23/06C08L23/08
CPCA61L15/18A61L15/24B32B27/32C08J5/18C08J2323/08C08L23/06C08L23/0815C08L2205/02C08L23/08C08L2666/06B32B5/022B32B7/12B32B2555/02B32B2555/00B32B27/205B32B2535/00B32B27/12B32B2307/516B32B2323/04
Inventor W·B·哈夫纳A·L·麦科马克V·A·托波尔卡雷夫
Owner KIMBERLY-CLARK WORLDWIDE INC