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Breathable films and process for producing them

A breathable film and film technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve problems such as insufficient strength to be used alone

Inactive Publication Date: 2001-02-28
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Breathable films by themselves provide vapor permeability and liquid barrier, but are usually not strong enough to be used alone

Method used

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  • Breathable films and process for producing them
  • Breathable films and process for producing them
  • Breathable films and process for producing them

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[0074] According to 6 kinds of filling polymer formulations, they were compounded and made into films on a film blowing line, and then uniaxially stretched using a longitudinal orienter. The obtained membranes were tested for WVTR using the procedure given above, and the hydraulic head pressure (resistance to hydraulic pressure) was also measured for some samples. Some also had tensile strength determined using the procedure described above. The following polymers were used in the formulation:

[0075] A. Exxon ICP PD-7623 E7, an impact copolymer containing 91wt% propylene and 9wt% ethylene, with a melt flow rate (230°C) of 7-10g / 10min; density, 0.90g / cc; crystallinity about 45% . The copolymer contains linear propylene segments and ethylene-propylene rubber segments.

[0076] B. Union Carbide 6D82, a propylene-ethylene random copolymer comprising 94.5 wt% propylene and 5.5 wt% ethylene, has a melt flow rate (230°C) of 7 g / 10 min.

[0077] C. Dow NG3310, a linear low de...

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Abstract

A breathable film having improved physical and barrier properties includes a stretched impact modified polyolefin matrix and a particulate filter. The impact modified polyolefin matrix includes at least one impact polypropylene copolymer, alone or in combination with other polymers. The film, and laminates including the film, provide excellent moisture breathability and excellent barrier to penetration by liquids. Laminates including the film may be used in diaper outercovers and other applications requiring breathability and resistance to penetration by liquids.

Description

field of invention [0001] The present invention relates to breathable polyolefin films having improved physical and barrier properties over conventional films of the same thickness. The present invention also includes methods of making such high impact strength (high impact) breathable films. Background of the invention [0002] Vapor-permeable, liquid-impermeable polymer films are known in the art. One method of making a polymeric film vapor permeable involves mixing a matrix polymer with a substantial amount (eg, 10-70 wt%) of an organic or inorganic particulate filler such as calcium carbonate, and extruding the blend into a film. The matrix polymer may include polyolefins such as polypropylene or polyethylene, various olefin copolymers and / or polymer blends. The film may be a monolayer film, a multilayer film comprising a filled film as its major layer, or a multilayer film comprising more than one filled layer. [0003] The film is then heated and stretched, causing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/12C08J5/18C08K3/26C08L23/02C08L23/10C08L23/14C08L23/16
CPCC08L23/142C08J2323/14B32B27/12C08L23/16C08K2003/265C08K3/26C08J5/18C08L23/02C08L23/10C08L2666/04B32B2262/0253B32B27/32B32B27/20B32B5/18B32B7/12B32B2305/30B32B2305/026B32B2307/724B32B2266/025
Inventor P·M·科利夫克K·G·赫茨勒
Owner KIMBERLY-CLARK WORLDWIDE INC
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