Invention Grant
- Patent Title: Multilayer tube
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Application No.: US17764286Application Date: 2020-09-30
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Publication No.: US11673380B2Publication Date: 2023-06-13
- Inventor: Shintarou Umeyama , Kouzou Makino , Yoshihiro Inui
- Applicant: SEKISUI CHEMICAL CO., LTD.
- Applicant Address: JP Osaka
- Assignee: SEKISUI CHEMICAL CO., LTD.
- Current Assignee: SEKISUI CHEMICAL CO., LTD.
- Current Assignee Address: JP Osaka
- Agency: Wenderoth, Lind & Ponack, L.L.P.
- Priority: JP 2019179798 2019.09.30
- International Application: PCT/JP2020/037291 2020.09.30
- International Announcement: WO2021/066066A 2021.04.08
- Date entered country: 2022-03-28
- Main IPC: B32B27/32
- IPC: B32B27/32 ; B32B1/08 ; B32B27/08

Abstract:
A multilayer tube is provided which suppresses the amount of calcium and organic component leaching to a low level and which can be realized as a tube that has mechanical properties at 60° C. This multilayer tube includes a first polyolefin resin layer configuring the innermost layer, and a second polyolefin resin layer arranged outside of the first polyolefin resin layer; the amount of calcium leaching, measured in accordance with SEMI F-57, of the material of the first polyolefin resin layer is less than 30 μg/m2; the ratio of the thickness of the first polyolefin resin layer to the total thickness of the first polyolefin resin layer and the second polyolefin resin layer is 0.011-0.17. By means of this configuration, it is possible to suppress the amount of leaching of calcium and organic substances to a low level, and to realize a pipe having a strength that takes into account a 60° C. use environment.
Public/Granted literature
- US20220347989A1 MULTILAYER TUBE Public/Granted day:2022-11-03
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