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Cast films, microporous membranes, and method of preparation thereof

A technology of cast thin film and microporous membrane, applied in the field of microporous membrane, which can solve the problems of lack of shape control and membrane performance

Inactive Publication Date: 2013-01-09
波利威乐赞助有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although several authors have investigated the use of various resins to form porous membranes, there is still a lack of information on morphology control and membrane properties

Method used

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  • Cast films, microporous membranes, and method of preparation thereof
  • Cast films, microporous membranes, and method of preparation thereof
  • Cast films, microporous membranes, and method of preparation thereof

Examples

Experimental program
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Embodiment Construction

[0072] The following embodiments are provided as non-limiting examples.

[0073] In the previously mentioned method, the gas used to cool the film may be air. It can also be various other gases such as nitrogen, argon, helium etc. which are commercially available.

[0074] For example, cast films can be prepared by extruding the film at a draw ratio (DR) of at least 50, 55, 60, 65, 70, 75, or 80. For example, the draw ratio may be from about 50 to about 100 or from about 60 to about 90.

[0075] For example, the film can have a thickness of about 20 μm to about 60 μm, about 30 μm to about 50 μm, or about 32 μm to about 45 μm.

[0076] According to one embodiment, gas can be blown onto the film by means of at least one gas knife.

[0077] For example, the cast film can be a single layer film or a multilayer film (eg, having 2 to 10 layers, 2 to 7 layers, 2 to 5 layers, 2 to 4 layers, 2 layers, or 3 layers).

[0078] For example, the gas cooling rate may be at least 0.5, 0.6...

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Abstract

There is provided a method for controlling the morphology of a cast film. The method comprises extruding a cast film by controlling a cooling rate of the cast film by applying on the film a gas at a gas cooling rate of at least about 0.4 cm3 / s per kg / hr in accordance with the extrudate flow rate.

Description

technical field [0001] The present invention relates to the field of microporous membranes obtained by means of cast film (cast film) precursors. More specifically, the present invention relates to methods for controlling the morphology of cast films. Background technique [0002] Among various resins, polypropylene (PP) is a well-known semi-crystalline polymer, and, compared with polyethylene (PE), PP has a higher melting point, lower density, and higher chemical resistance. properties, as well as better mechanical properties, which make it useful in many industrial applications. [0003] Crystalline phase orientation in semicrystalline polymers such as polypropylene can enhance many of their properties, especially mechanical, impact, barrier, and optical properties [1]. Obtaining an oriented structure in PP is of great benefit for many processes such as film blowing, spinning, film casting, etc. In these processes, a polymer melt is subjected to shear (in the die) and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/88B01D67/00B29C47/04B29D7/01B29C48/08B29C48/10
CPCB01D69/12B29K2023/12B29C47/8875B29C55/005B01D67/002B01D67/0027B01D2323/08B29C47/0021B29C47/0026B01D71/26B29K2023/06B29K2105/04B29C55/023B29C48/08B29C48/10B29C48/914B29C48/917Y10T428/249978B01D2323/081B01D69/1216B01D2323/082B01D69/1212B01D71/261B01D71/262B01D67/00B29D7/01B29C48/16
Inventor 赛义德·赫萨莫德丁·塔巴塔贝皮埃尔·卡雷奥阿卜杜拉·阿吉
Owner 波利威乐赞助有限公司