Photocurable composition, sealing agent, and cured product
AssigneeThreebond Co., Ltd.
InventorChiaki Matsui
Life of this patent
Estimating the term…
Abstract
A photocurable composition contains components (A) to (D). The composition contains 1 to 50 parts by mass of the following component (B) and 50 to 300 parts by mass of the component (C) relative to 100 parts by mass of the following component (A). The component (A) is a polyisobutylene having a (meth)acryloyl group in its molecule. The component (B) is a urethane-modified (meth)acrylate oligomer (excluding the component (A)). The component (C) is a (meth)acrylate monomer (excluding the component (A) and the component (B)). The component (D) is a photoinitiator.
Claims12
A photocurable composition comprising the following components (A) to (D), and containing 1 to 50 parts by mass of the following component (B) and 50 to 300 parts by mass of the component (C) relative to 100 parts by mass of the following component (A);
- component (A):
- a polyisobutylene having a (meth)acryloyl group in its molecule
- component (B):
- a urethane-modified (meth)acrylate oligomer that is different from the component (A)
- component (C):
- a (meth)acrylate monomer that is different from the component (A) and the component (B)
- component (D):
- a photoinitiator,
- wherein the photocurable composition has a structural viscosity ratio in a range from 3.0 or more to less than 5.5, the structural viscosity ratio being defined as a viscosity measured at a shear rate of 2 s−1 divided by a viscosity measured at a shear rate of 20 s−1, both of the viscosities being measured at 25° C. using a cone-plate viscometer.
Dependencies are inferred from the claim text.