Title:
MULTILAYER TUBE
Document Type and Number:
WIPO Patent Application WO/2021/172251
Kind Code:
A1
Abstract:
The present invention provides a multilayer tube which is flexible and exhibits excellent durability in terms of airtightness, while containing, as a main component, a polytetrafluoroethylene. The present invention is achieved by a multilayer tube which contains, as a main component, a polytetrafluoroethylene, wherein if the total porosity (%) of the tube is taken on the horizontal axis of a coordinate graph and the Martens hardness HM3mN of the tube as described below is taken on the vertical axis, coordinate points representing characteristics of the multilayer tube are within a quadrangle that is bounded by four coordinate points, namely a (7.5, 0.25), b (8, 0.02), c (25, 0.38) and d (25, 0.03) on the graph. Meanwhile, HM3mN represents the Martens hardness at the time when the test force reaches 3 mN during the process of load application, with the maximum test force being set to 4 mN, if the inner surface of the tube is measured in accordance with ISO 14577.
Inventors:
AKUTSU RYO (JP)
Application Number:
PCT/JP2021/006539
Publication Date:
September 02, 2021
Filing Date:
February 22, 2021
Export Citation:
Assignee:
JUNKOSHA INC (JP)
International Classes:
B32B5/18; B32B1/08; B32B27/30; F16L11/04
Foreign References:
| JPH0872178A | 1996-03-19 | |||
| JPH071630A | 1995-01-06 | |||
| JP2012153076A | 2012-08-16 | |||
| JP2012136020A | 2012-07-19 | |||
| JP2018038783A | 2018-03-15 | |||
| JP27030194A | 1994-10-07 | |||
| JP7217896A | 1996-03-27 |
Other References:
See also references of EP 4112293A4
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