Polytetrafluoroethylene membrane, method for producing the same, and filter
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- KOMEMTEC CO LTD
- Filing Date
- 2024-12-04
- Publication Date
- 2026-06-16
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
【0023】 本発明によるPTFE膜は、組織均一性、引張強度、気孔度および気孔サイズに優れているので、高能率フィルタ媒体、フィルタパック、およびフィルタユニットに有用に使用することができる。
Smart Images
Figure 2026097098000001_ABST
Abstract
Claims
1. A process for producing a PTFE composition comprising first PTFE particles, second PTFE particles, and additives; A step of manufacturing a PTFE sheet by extruding the PTFE composition; and A method for producing a PTFE film, comprising the step of stretching the PTFE sheet.
2. The method for producing a PTFE film according to claim 1, wherein the first PTFE particles and the second PTFE particles have different heats of melt.
3. The method for producing a PTFE film according to claim 2, wherein the mixed weight ratio of the first PTFE particles to the second PTFE particles is in the range of 6:4 to 2:
8.
4. The method for producing a PTFE film according to claim 2, wherein the mixed weight ratio of the first PTFE particles to the second PTFE particles is in the range of 5:5 to 3:
7.
5. The method for producing a PTFE film according to claim 2, wherein the heat of melting of the first PTFE particles, calculated by performing DSC analysis under a heating rate condition of 10°C / min, is in the range of 60 to 70 J / g, and the heat of melting of the second PTFE particles is in the range of 50 to 60 J / g.
6. A method for producing a PTFE film according to claim 5, wherein the heat of melting of the first PTFE particles is in the range of 61 to 66 J / g, and the heat of melting of the second PTFE particles is in the range of 52 to 58 J / g.
7. The method for producing a PTFE film according to claim 2, wherein the difference in melting temperature between the first PTFE particles and the second PTFE particles is 2.0°C or less.
8. The method for producing a PTFE film according to claim 2, wherein the difference in melting temperature between the first PTFE particles and the second PTFE particles is 1.0°C or less.
9. The method for producing a PTFE film according to claim 1, wherein the additive is a hydrocarbon mixed solution, and the molar ratio of hydrocarbons having 9 to 10 carbon atoms to hydrocarbons having 10 to 13 carbon atoms is in the range of 8:2 to 6:
4.
10. The method for producing a PTFE film according to claim 9, wherein the additive is contained in 10 to 30% by weight of the PTFE composition.
11. A PTFE film manufactured by the manufacturing method described in claim 1.
12. The PTFE film according to claim 11, wherein the pore size is in the range of 0.2 to 0.5 μm and the porosity is in the range of 70 to 90%.
13. A filter medium comprising a PTFE film according to claim 11 and a breathable support member laminated on the PTFE film.
14. A filter pack comprising a pleated filter medium according to claim 13.
15. A filter unit comprising a filter pack according to claim 14 and a frame that supports the peripheral edge of the filter pack.