Invention Grant
- Patent Title: Heat resistant release sheet and method for manufacturing same
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Application No.: US16498117Application Date: 2018-03-27
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Publication No.: US11123967B2Publication Date: 2021-09-21
- Inventor: Kurato Akiba , Yuta Kuroki
- Applicant: NITTO DENKO CORPORATION
- Applicant Address: JP Osaka
- Assignee: NITTO DENKO CORPORATION
- Current Assignee: NITTO DENKO CORPORATION
- Current Assignee Address: JP Osaka
- Agency: Greenblum & Bernstein P.L.C.
- Priority: JPJP2017-068007 20170330
- International Application: PCT/JP2018/012600 WO 20180327
- International Announcement: WO2018/181403 WO 20181004
- Main IPC: B32B27/30
- IPC: B32B27/30 ; B32B27/32 ; B29C33/68 ; B32B7/06

Abstract:
A heat resistant release sheet of the present disclosure includes a polyimide substrate, and a first polytetrafluoroethylene (PTFE) layer and a second PTFE layer that sandwich the polyimide substrate therebetween. PTFE composing the first PTFE layer and PTFE composing the second PTFE layer each have a number-average molecular weight of 6 million or more, and a peel force required to peel the first PTFE layer from the polyimide substrate is 0.5 N/20 mm or more, and a peel force required to peel the second PTFE layer from the polyimide substrate is less than 0.5 N/20 mm. The heat resistant release sheet of the present disclosure has a new structure and can also be used for thermocompression bonding at a higher temperature.
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