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Microporous material from ethylene-chlorotrifluoroethylene copolymer and method for making same

A technology of chlorotrifluoroethylene and microporous materials, which is applied in the field of preparing such materials and manufacturing microporous materials, and can solve the problems that premixing technology cannot provide fast enough

Inactive Publication Date: 2014-05-07
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when used in the TIPS process to make ECTFE microporous materials by extrusion, nucleating agents tend to agglomerate and / or separate out of solution / dispersion as they pass through the extrusion system
Premixing techniques generally do not provide a sufficiently fast rate of crystallization of ECTFE or the desired morphology (e.g., spherulite matrix)

Method used

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  • Microporous material from ethylene-chlorotrifluoroethylene copolymer and method for making same
  • Microporous material from ethylene-chlorotrifluoroethylene copolymer and method for making same
  • Microporous material from ethylene-chlorotrifluoroethylene copolymer and method for making same

Examples

Experimental program
Comparison scheme
Effect test

example

[0113] Additional embodiments of the present invention are further illustrated in the following non-limiting examples.

[0114] Fabrication of Microporous ECTFE Materials

[0115] Microporous ECTFE materials were prepared using a twin-screw extruder equipped with a melt pump, neck tube, and sheet die (set above a patterned casting wheel) or hollow fiber die (set above a water-filled quench bath). The preparation steps of the microporous material include: melt extrusion; casting / quenching; solvent washing to remove diluent; drying to remove solvent; The sample's pore size, porosity, thickness, and water flow resistance are then determined.

[0116] Material :

[0117] The following material is referred to in various instances:

[0118] polymer : ECTFE fluoropolymers commercially available from Solvay Solexis, New Jersey, USA under the trade designations "Halar 902", "Halar 901" and "Halar 300DA".

[0119] Thinner : Dibutyl sebacate ("DBS") commercially available fro...

example 1-10

[0136] Microporous ECTFE materials were prepared using the components and concentrations shown in Table 1. According to the test method described herein, the properties of the test example materials are tested, and the test results are shown in Table 2.

[0137] Table 1

[0138]

[0139] Table 2

[0140] example

example 11

[0142] The melt blended composition (Halar 902ECTFE copolymer, 0.22% by weight of DBS and olefin / blue nucleating agent, same as Example 5) was extruded through a hollow fiber die and cast into a filled chamber maintained at 120°F (49°C). In a water quenching bath, the microporous ECTFE material is prepared in this way. The resulting material is a porous ECTFE hollow fiber. The hollow fibers were washed in a solvent to remove the DBS diluent, dried, and stretched longitudinally in hot air at 250°F (121°C) at a stretch ratio of 2:1. Isopropanol immediately wets the fiber, indicating that it is porous.

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PUM

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Abstract

Microporous material having a spherulitic matrix made from ethylene chlorotrifluoroethylene copolymer has a plurality of pores having an average pore size greater than about 0.01 micrometer. The material is made by thermally induced phase separation (TIPS) process that includes melt mixing ethylene chlorotrifluoroethylene copolymer, diluent and nucleating agent to provide a melt mixed composition; shaping the melt mixed composition; cooling the shaped melt mixed composition to induce phase separation of the ethylene chlorotrifluoroethylene copolymer to provide a phase separated material; and stretching the phase separated material to provide the microporous material. The microporous material may be incorporated into articles and the articles may include one, two or more layers of microporous material.

Description

[0001] The present invention relates to microporous materials made from ethylene-chlorotrifluoroethylene copolymers, and to methods of making such materials. Background technique [0002] The potential use of microporous materials made from ethylene-chlorotrifluoroethylene ("ECTFE") copolymer, a solvent-resistant material, is widely recognized in the art. Microporous materials can often be fabricated using phase separation methods such as "thermally induced phase separation" ("TIPS"). However, the TIPS method has not been successfully used to fabricate ECTFE microporous materials that can also withstand further processing, such as removal of diluent and material stretching to impart high porosity. ECTFE membranes generally lack the strength required to withstand folding and pleating in the manner required to create high surface area filter materials, eg, suitable for placement in filter cartridges. [0003] Nucleating agents have been used in the preparation of microporous ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/00B29C48/04B29C48/08
CPCB01D69/02B01D71/26B01D2325/02B01D2325/48B32B5/32B01D71/32C08J2327/04C08J2327/12B29C67/20B01D71/76B32B5/18B01D67/002C08J2327/02B01D2323/42C08J5/18B32B27/28B32B5/022B32B5/024B32B5/026B32B15/08B32B27/065B32B27/08B32B27/12B32B27/20B32B27/32B32B27/322B32B2250/04B32B2255/26B32B2307/21B32B2307/4026B32B2307/518B32B2307/704B32B2307/7145B32B2307/734B32B2457/10B29C48/08B29C48/914B29C48/919Y10T442/469Y10T442/3366Y10T428/249978Y10T442/652C08F210/02C08F214/24C08J9/00B29C48/04
Inventor 詹姆士·S·姆罗津斯基兰德尔·P·斯温森卡尔-迪艾特·韦兰德特乔纳森·F·赫斯特
Owner 3M INNOVATIVE PROPERTIES CO