Photocurable composition, cured body, gasket in which cured body is used, watertight structure, and method for manufacturing gasket
AssigneeSekisui Polymatech Co., Ltd.
InventorYu Kekura
Life of this patent
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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.
Claims9
A photocurable composition comprising:
- a telechelic acrylic polymer having an acryloyl group at both ends, the telechelic acrylic polymer being present in an amount of 22 to 71 mass %;
- a polyfunctional acrylic polymer having acryloyl groups, the polyfunctional acrylic polymer being present in an amount of 7 to 54 mass %;
- a monofunctional acrylic monomer selected from a monofunctional alicyclic (meth)acrylic acid ester monomer, a monofunctional aliphatic (meth)acrylic acid ester monomer, a monofunctional ether-containing (meth)acrylic acid ester monomer, and a monofunctional imide-containing (meth)acrylic acid ester monomer, the monofunctional acrylic monomer being present in an amount of 3 to 27 mass %;
- a polyfunctional photocurable monomer being present in an amount of 0 to 10 mass %;
- and
- a fumed silica including at least one of a hydrophilic fumed silica or a fumed silica having a polar group, the fumed silica being present in an amount of 2 to 10 mass %, wherein
- 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.
Dependencies are inferred from the claim text.