Diffusible films

A blend, elastomer technology, used in the field of diffusion membranes

Inactive Publication Date: 2003-06-18
CELGARD LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these prior art teaches or suggests how to improve t...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Examples 1, 3, 5 and 7 are non-porous precursor (ie pre-stretch introduced porosity) films. Examples 2, 4, 6 and 8 are microporous films. All materials were blended by conventional melt blending techniques. Examples 1 and 2 are polyethylene (HDPE, density - 0.959, MFI - 0.42, medium molecular weight, narrow molecular weight distribution) with EPDM rubber (Mooney viscosity - 45, ethylene % - 69, dienes % - 0.5, narrow molecular weight distribution ) blends. Examples 3 and 4 are blends of polypropylene (isotactic homopolymer, density - 0.905, MFI - 1.5) and EPDM rubber (same as Examples 1 and 2). Examples 5 and 6 are blends of polypropylene (same as Examples 3 and 4) with EPR rubber (Mooney viscosity - 51, ethylene % - 61, narrow molecular weight distribution). Examples 7 and 8 are blends of polyethylene (HDPE, density - 0.961, MFI - 0.38) with EPDM rubber (Mooney viscosity - 52, ethylene % - 70, diene % - 3.4, broad molecular weight distribution). These films were co...

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PUM

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Abstract

A diffusion membrane is a microporous sheet comprising a blend of an aliphatic polyolefin and a thermoplastic olefin (TPO) elastomer. The blend comprises less than 10 percent by weight of the elastomer. The preferred polyolefins are selected from a group consisting of polyethylene, polypropylene, copolymers thereof, and blends thereof. The preferred TPO elastomers are selected from the group consisting of ethylene-propylene rubbers (EPR), ethylene-propylene-diene terpolymer rubbers (EPDM), and combinations thereof.

Description

field of invention [0001] A diffuser membrane is prepared from a blend of aliphatic polyolefin and thermoplastic olefin elastomer. Background of the invention [0002] A membrane is a structure that acts as a boundary between two different phases and resists the movement of molecules between the two phases to a greater or lesser degree. This movement is also called diffusion. Membranes can be solid, ie non-porous, or semi-permeable, ie microporous. These microporous structures act as diffusion barriers, as well as high-efficiency filters in the molecular size range, which pass ions, water and other solvents with very small molecules, but hardly permeate large molecules such as proteins and colloidal particles . These membranes are used in process operations such as waste liquid recovery, desalination, electrolysis, osmosis and dialysis, and in industrial applications such as flow regulators in lighters, membranes in oxygenators, charge storage devices such as batteries an...

Claims

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Application Information

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IPC IPC(8): B01D53/22B01D71/24B01D71/26B32B27/32C08J9/00C08L23/04C08L23/10C08L23/16H01M50/403H01M50/406H01M50/417H01M50/494
CPCC08L23/04B01D71/26H01M2/145H01M2/1653C08L23/16C08L23/10B01D71/24Y10T428/31909Y10T428/249953Y10T428/31938Y02E60/10H01M50/403H01M50/417H01M50/406H01M50/494C08L2666/04B32B27/32
Inventor K·V·尼盖恩D·K·西蒙斯R·W·考尔S·E·赫克斯
Owner CELGARD LLC
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