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Porous membrane of poly(metaphenylene isophthalamide) and process for producing the same

A technology of polym-phenylene isophthalamide and its manufacturing method, which is applied in the field of porous membrane and its manufacturing, and can solve the problems of increased average pore size and unsuitability

Inactive Publication Date: 2009-02-04
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a small amount of inorganic salt remains in the porous film of the final product, so it is not suitable as a material for electronic applications.
[0006] In addition, porous membranes made of aromatic polyamides are often subjected to stretching treatment in order to increase the surface porosity, but in this case, the average pore diameter also increases with the stretching treatment. there will be problems

Method used

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  • Porous membrane of poly(metaphenylene isophthalamide) and process for producing the same
  • Porous membrane of poly(metaphenylene isophthalamide) and process for producing the same
  • Porous membrane of poly(metaphenylene isophthalamide) and process for producing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0140] Porous membranes were produced under the conditions shown in Table 1. Specific steps are as follows.

[0141] The CONEX polymer was dissolved in N-methyl-2-pyrrolidone and adjusted so that the concentration of polym-phenylene isophthalamide was 10% by weight. The dope was cast onto a polypropylene film (at 140 g / cm 2 The contact pressure was applied 30 times on the rubbing treatment) so that the thickness was 140 μm. Next, the cast product was put into a 15° C. coagulation bath containing 60% by weight of N-methyl-2-pyrrolidone and 40% by weight of water for 5 minutes to obtain a coagulated film. Then, the solidified film was peeled off from the polypropylene film, and immersed in a water bath at 50° C. for 30 minutes. Furthermore, this solidified film was treated at 120° C. for 30 minutes, and then at 270° C. for 30 minutes, thereby obtaining a porous film of polym-phenylene isophthalamide.

[0142] The physical properties of the porous membrane are shown in Table ...

Embodiment 2

[0144] According to the method of Example 1, a porous membrane was produced under the conditions shown in Table 1.

[0145] The characteristics of the obtained porous membrane are shown in Table 1. As in Example 1, it was also excellent in liquid permeability, impregnation properties, mechanical properties, and the like.

[0146] Epoxy resin impregnation is also good, and it has good adhesion to copper foil when used as a prepreg.

Embodiment 3

[0148] Exactly the same operation as in Example 1 was carried out, and the cast product was put into a coagulation bath to form a coagulation film. The solidified film was then peeled off from the polypropylene film, and fixed with a metal frame so as not to shrink the solidified film. Next, this was thrown into a 65 degreeC coagulation bath containing 50 weight% of N-methyl-2-pyrrolidone and 50 weight% of water for 30 minutes. Then, this solidified film was removed from the metal frame, and immersed in a water bath at 50° C. for 30 minutes. The shrinkage at the end of immersion was 9.8% by area. Next, the solidified film was dried at 120° C. for 30 minutes. The shrinkage rate at this time was 19% by area ratio. Furthermore, it heat-processed at the temperature of 280 degreeC for 30 minutes, and obtained the porous membrane.

[0149] The film thickness of the obtained porous membrane was 55 μm, the porosity was 70%, the porosity of the surface (the surface not in contact w...

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Abstract

The invention provides a porous film having a plurality of connected pores, and a process for its production. The porous film of the invention is a porous film formed from highly heat resistant poly(metaphenylene isophthalamide), and having specific ranges for the open areas and difference between them on both surfaces, as well as specified ranges for the mean pore sizes and porosity on both surfaces. The permeability and impregnation with respect to substances such as air and water, as well as the dynamic strength, are therefore excellent, and the porous film can be used for filters, and for curing resin-impregnated prepregs, multilayer wiring boards, electronic package substrates and the like employing the porous film as a core material.

Description

technical field [0001] The invention relates to a porous membrane containing polym-phenylene isophthalamide and a manufacturing method thereof. The porous membrane can be used in various precision filter membranes, multilayer wiring substrates, electronic packaging substrates and flexible printed substrates using the porous membrane as a core material. Background technique [0002] Conventionally, a polyolefin-based porous film typified by polypropylene is known as a porous film. However, these porous membranes lack heat resistance, and when used at temperatures above, for example, 180° C., the membrane and pores thermally shrink to increase dimensional changes, resulting in a problem that the function as a porous membrane is reduced or lost. [0003] An aromatic polyamide porous membrane is known as a membrane having excellent heat resistance as a substitute thereof. Japanese Patent Publication No. 59-14494 describes a method for producing an aromatic polyamide porous fil...

Claims

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Application Information

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IPC IPC(8): C08J9/26B01D67/00B01D69/02B01D71/56C08J9/28H05K1/03
CPCH05K1/0366B01D69/02B01D67/0016C08J2377/10B01D67/0013B01D2323/12B01D71/56B01D2325/22C08J9/28C08J5/22C08J9/26B01D67/00165
Inventor 佐佐木毅城户伸明松村俊一
Owner TEIJIN LTD
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