Invention Grant
- Patent Title: Photocurable composition, cured body, gasket in which cured body is used, watertight structure, and method for manufacturing gasket
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Application No.: US17791518Application Date: 2021-03-24
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Publication No.: US11613645B2Publication Date: 2023-03-28
- Inventor: Yu Kekura
- Applicant: SEKISUI POLYMATECH CO., LTD.
- Applicant Address: JP Saitama
- Assignee: SEKISUI POLYMATECH CO., LTD.
- Current Assignee: SEKISUI POLYMATECH CO., LTD.
- Current Assignee Address: JP Saitama
- Agency: Cermak Nakajima & McGowan LLP
- Agent Tomoko Nakajima
- Priority: JPJP2020-057493 20200327
- International Application: PCT/JP2021/012404 WO 20210324
- International Announcement: WO2021/193770 WO 20210930
- Main IPC: C08L33/14
- IPC: C08L33/14 ; F16J15/10

Abstract:
A photocurable composition is provided. A cured product formed by curing the photocurable composition has reworkability and excellent heat resistance while having flexibility. The photocurable composition includes a telechelic acrylic polymer having an acryloyl group at both ends; a polyfunctional acrylic polymer having acryloyl groups; a monofunctional acrylic monomer; and a fumed silica including at least one of a hydrophilic fumed silica or a fumed silica having a polar group. The photocurable composition has a Martens hardness of 0.07 to 0.75 N/mm2, where the Martens hardness is a hardness after the photocurable composition is cured.
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