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Breathable multilayer films with breakable skin layers

A technology of breathable film and surface layer, which is applied in the direction of layered products, thin material processing, household appliances, etc., and can solve the problems of not adding compatibilizers

Inactive Publication Date: 2008-11-05
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The '988 application does not address the addition of compatibilizers to the incompatible polymers of the skin or layers

Method used

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  • Breathable multilayer films with breakable skin layers
  • Breathable multilayer films with breakable skin layers
  • Breathable multilayer films with breakable skin layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Multilayer films are prepared by coextruding a core layer with two skin layers. The core layer is made from the following materials: 20 wt% linear low density polyethylene (LLDPE), manufactured by The Dow Chemical Company ("Dow") under the trade name Dowlex 2517; 20 wt% low density polyethylene (LDPE) manufactured by Dow under the trade name Dowlex 2047AC; 60 wt% calcium carbonate coated with 1 wt% behenic acid, manufactured by ECC International (Sylacauga, Alabama), trade name 2029. Each skin layer is made of the following materials: 58.5 wt% heterophasic polypropylene available from Montell under the trade name Catalloy KS 357P; 39 wt% Styron 615APR available from Dow Chemical Company as a compatibilizer; 2 wt% Kraton G1652 available from From KratonPolymers, as a stabilizer.

[0089] Quench cast extruded three-layer film. After forming the film, the film is stretched by passing the film through a machine direction orienter (DMO). The film was stretched 4.26 time...

Embodiment 2 and comparative example 1

[0091] Multilayer films are prepared by coextruding a core layer with two skin layers. The core layer is made from the following materials: 20 wt% linear low density polyethylene (LLDPE), manufactured by The Dow Chemical Company ("Dow") under the trade name Dowlex 2517; 20 wt% low density polyethylene (LDPE) manufactured by Dow under the trade name Dowlex 2047AC; 60 wt% calcium carbonate coated with 1 wt% behenic acid, manufactured by ECC International (Sylacauga, Alabama), trade name 2029. The skin layer was prepared from the ingredients shown in Table 2.

[0092] Table 2

[0093] components

Comparative example 1

Example

2a

Example

2b

Example

2c

Example

2d

ADFLEX 357P

(PP / PE Copoly) 1

49.75％

58.82％

49.02％

58.82％

49.02％

Escorene

LD768.36(EVA) 2

49.75％

-

-

-

-

LQA006(LDPE) 3

-

...

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Abstract

A breathable multilayer film having a breathable core layer and at least one skin layer is disclosed. The core layer prepared by from a mixture containing a thermoplastic polymer and a particulate filler and the skin layer or layers are prepared from a mixture of at least two incompatible polymers and a polymer which compatiblizes the incompatible polymers. The addition of the compatiblizer in the skin layer improves the film forming consistency. In addition, the core layer contains voids around the particulate filler and the skin layer or layer has cracks or voids, which provides breathability to the multilayer film. Stretching of the film after the layers are coextruded together forms the voids and / or cracks. The multilayer film of the present invention can be laminated with woven and nonwoven materials and the multilayer film of the present invention, whether or not the films are laminated with other materials, are useful in a wide variety of personal care products, medical garments and other product in which breathability is desired.

Description

field of invention [0001] The present invention relates to a breathable multilayer film having a core layer and one or two adjacent skin layers. The core layer contains a mixture of thermoplastic polymer and particulate filler and becomes moisture vapor (water vapor) permeable when the film is stretch thinned after coextrusion with the skin layer or layers. The skin layer or layers prevent fouling of the filler particles in the core layer on the die lip during coextrusion. Cracks, voids, tears and / or ruptures form in the skin layer or layers during stretching, thereby increasing the breathability of the overall film. Background of the invention [0002] Breathable stretch thinned films and laminates comprising breathable films and nonwoven webs are used in diaper backings, other personal care products and medical garments. For example, US Patent 5,695,868 to McCormack discloses a breathable film and a breathable cloth-like film / nonwoven composite comprising the film therma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B32B27/18A41D13/00A41D13/12A41D31/00A41D31/02A61F13/15A61F13/49A61F13/514B29C55/00B29C55/02B32B27/08B32B27/12B32B27/20
CPCB29C55/023Y10S428/91B32B27/32B32B27/20B29C55/005B29K2105/04B29K2105/16Y10T428/249986Y10T442/678Y10T428/249955Y10T442/674Y10T428/249958Y10T428/249981Y10T428/249953Y10T428/31913Y10T428/31909B32B2305/20B32B2270/00B32B7/12B32B2437/00B32B2307/724B32B5/022B32B2323/16B32B2323/046B32B2323/10B32B27/302B32B2250/24B32B2325/00B32B27/08B32B2555/02
Inventor J·D·图克尔
Owner KIMBERLY-CLARK WORLDWIDE INC