Threebond Co., Ltd.

Kazuyuki Ueno

Takashi Nemoto

Yoshihide Arai

Yoshiaki Koga

The sheet-shaped photocurable composition of the present invention includes components (A) to (D) as follows, and is in a sheet shape at 25° C. in a state before curing:

Sheet-shaped photocurable composition, photocurable composition solution, method for producing sheet-shaped photocurable composition, and laminated body

The present invention provides a photocurable composition containing an ultraviolet absorber, which yields a cured material thereof having a high cutting capability against ultraviolet rays from the outside, a low yellow index, and colorlessness and transparency, both immediately after preparing the same and after a lapse of time of being left in a severe environment such as a high-temperature and high-humidity environment, an environment exposed to water or light, and the like. The present invention relates to a sheet-shaped photocurable composition including the following components (A) to (E): a component (A): a (meth)acrylate compound; a component (B): a film forming resin; a component (C): a photoinitiator; a component (D): a compound having a specific skeleton structure; a component (E): a compound having a specific group in the molecule.

Photocurable composition and cured material thereof

The present invention provides a photocurable composition containing an ultraviolet absorber, which has high photocurability and yields a cured material having a high cutting capacity against ultraviolet rays from the outside, a low yellow index, and colorlessness and transparency. The present invention relates to a sheet-shaped photocurable composition which includes the following components (A) to (D), and when a cured material obtained after photocuring the photocurable composition has a thickness of 150 μm, a yellow index of the cured material is 4.0 or less and a light transmittance of the cured material at a wavelength of 385 nm is 5.0% or less: a component (A): a (meth)acrylate compound, a component (B): a film forming resin, a component (C): a photoinitiator, and a component (D): an ultraviolet absorber.

Conventionally, a photocurable composition to which an ultraviolet absorber is added is difficult to form a colorless and transparent cured resin because the ultraviolet absorber itself is colored, and thus the photocurable composition is hardly to be used in a display apparatus required for colorlessness and transparency. Provided is a photocurable composition including a specific compound, wherein a light transmittance of 385 nm is 50% or less and a yellowness index is 3.0 or less in a state in which a cured resin having a thickness of 200 &#x3bc;m or less is interposed between alkali free glass plates each having a thickness of 0.7 mm.

Photocurable composition

The present invention makes it possible to maintain a high 180-degree peel strength of a photocurable composition having a film shape at 25&#xb0; C. in the state of not being cured against untreated PET as an adherend when bonding is performed by lamination at normal temperature. A photocurable composition having a film shape at 25&#xb0; C. in a state of not being cured, which contains the following components (A) to (C) and in which the photocurable composition contains 1 to 45 parts by mass of the component (B) with respect to 100 parts by mass of the component (A), a temperature of tan &#x3b4;=1 is 30&#xb0; C. to 60&#xb0; C. before curing, a storage elastic modulus at 25&#xb0; C. is 10.0&#xd7;10Pa or less after curing. Component (A): urethane-modified (meth)acrylate oligomer Component (B): film forming agent Component (C): photoinitiator

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Tokyo, Japan

Kazuyuki Ueno