Title:
WATERPROOFING AIR-PERMEABLE MEMBRANE
Document Type and Number:
Japanese Patent JP2020157233
Kind Code:
A
Abstract:
To provide a waterproofing air-permeable membrane that prevents a deterioration of oxygen permeation performance.SOLUTION: The waterproofing air-permeable membrane having a permeability of 1 or less obtained in a liquid permeability measurement test of the following (1) to (5): (1) a polyethylene terephthalate-made nonwoven fabric (base weight amount: 220 to 300 g/mm2) is laminated on a face opposite to a treated water contact face in the waterproofing air-permeable membrane to obtain a test piece of 50 mm square, and ten pieces of the test pieces are prepared, (2) the ten test pieces are put on a glass plate so that nonwoven fabric side faces are brought contact with the glass plate to fix the test pieces with a tape having a width of 10 mm, (3) 10 ml of a test solution prepared by dissolving 0.7 mass% of perfluoroalkyl group-containing carboxylate and 0.3 mass% of Allura Red in ion-exchanged water is dropped on the respective treated water contact faces at one time with pipettes, (4) the respective test pieces are left standing still at a temperature of 25±5°C and a humidity of 50±10% for 18 hours, and (5) the permeability is defined as the number of the test piece(s) for which the permeation of the test solution through the test piece(s) can be confirmed from the glass plate side.SELECTED DRAWING: Figure 1
Inventors:
ISHII YOSHIKAZU
Application Number:
JP2019059722A
Publication Date:
October 01, 2020
Filing Date:
March 27, 2019
Export Citation:
Assignee:
SEKISUI CHEMICAL CO LTD
International Classes:
C02F3/10; B01F1/00; B01F5/06; B01J4/00; B32B7/02
Domestic Patent References:
| JP2019037974A | 2019-03-14 | |||
| JP2016187802A | 2016-11-04 | |||
| JP2014061505A | 2014-04-10 | |||
| JP2006258764A | 2006-09-28 | |||
| JP2017087191A | 2017-05-25 | |||
| JP2020089838A | 2020-06-11 |
Attorney, Agent or Firm:
Patent Business Corporation Saegusa International Patent Office