Resin layer having a specific elastic modulus, optical film, and image displaying device
One embodiment of the present disclosure provides a resin layer 10 used for an image displaying device, wherein a shear storage elastic modulus G′ of the resin layer 10 , at 25° C. and frequency range of 500 Hz or more and 1000 Hz or less, is 30 MPa or more and 200 MPa or less, and a glass transition temperature of the resin layer 10 is 50° C. or more.
1 . An optical film with a foldable stacked structure,
the optical film comprising a resin layer and a hard coating layer,
wherein
a shear storage elastic modulus G′ of the resin layer, at 25° C. and frequency range of 500 Hz or more and 1000 Hz or less, is 30 MPa or more and 200 MPa or less;
a glass transition temperature of the resin layer is 50° C. or more and 90° C. or less;
the hard coating layer is provided on one surface side of the resin layer so as to be in contact with the resin layer; and
the resin layer comprises a urethane-based resin.
2 . The optical film according to claim 1 , wherein a thickness is 20 μm or more and 150 μm or less.
3 . The optical film according to claim 1 , further comprising a resin substrate provided on one surface side of the resin layer.
4 . The optical film according to claim 1 , wherein a crack or a breakage does not occur in the optical film, when a test wherein the optical film is folded by 180° so as a distance between opposing side portions of the optical film is 10 mm, is repeatedly carried out for 100,000 times under 23° C. environment.
5 . The optical film according to claim 4 , wherein a crack or a breakage does not occur in the optical film, when a test wherein the optical film is folded by 180° so as a distance between opposing side portions of the optical film is 10 mm, is repeatedly carried out for 100,000 times under −40° C. environment.
6 . The optical film according to claim 1 , wherein the hard coating layer has a thickness of 3 μm or more and 10 μm or less.
7 . The optical film according to claim 1 , wherein the hard coating layer comprises a cured product of a composition containing a polyfunctional (meth)acrylate and inorganic particles.
8 . An image displaying device comprising
a displaying element; and
the optical film according to claim 1 , placed on an observer side relative to the displaying element.
9 . The image displaying device according to claim 8 , wherein the displaying element is an organic light emitting diode element.
10 . An optical film with a foldable stacked structure,
the optical film comprising a resin layer and a hard coating layer, wherein
a shear storage elastic modulus G′ of the resin layer, at 25° C. and frequency range of 500 Hz or more and 1000 Hz or less, is 30 MPa or more and 200 MPa or less;
a glass transition temperature of the resin layer is 50° C. or more and 90° C. or less;
the hard coating layer is provided on one surface side of the resin layer so as to be in contact with the resin layer; and
the resin layer comprises 15 to 90 parts by mass of a urethane (meth)acrylate having 2 to 4 (meth)acryloyl groups and a weight average molecular weight of 1,500 to 20,000.
11 . An image displaying device comprising
a displaying element; and
the optical film according to claim 10 , placed on an observer side relative to the displaying element.
12 . An optical film with a foldable stacked structure,
the optical film comprising a resin layer and a hard coating layer, wherein
a shear storage elastic modulus G′ of the resin layer, at 25° C. and frequency range of 500 Hz or more and 1000 Hz or less, is 30 MPa or more and 200 MPa or less;
a glass transition temperature of the resin layer is 50° C. or more and 90° C. or less;
the hard coating layer is provided on one surface side of the resin layer so as to be in contact with the resin layer; and
the resin layer comprises 5 to 50 parts by mass of a polyfunctional (meth)acrylate selected from pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, and dipentaerythritol hexaacrylate.
13 . An image displaying device comprising
a displaying element; and
the optical film according to claim 12 , placed on an observer side relative to the displaying element.
14 . An optical film with a foldable stacked structure,
the optical film comprising a resin layer and a hard coating layer, wherein
a shear storage elastic modulus G′ of the resin layer, at 25° C. and frequency range of 500 Hz or more and 1000 Hz or less, is 30 MPa or more and 200 MPa or less;
a glass transition temperature of the resin layer is 50° C. or more and 90° C. or less;
the hard coating layer is provided on one surface side of the resin layer so as to be in contact with the resin layer; and
the resin layer comprises 5 to 10 parts by mass of a monofunctional (meth)acrylate selected from phenoxyethyl acrylate, dicyclopentanyl acrylate, and isobornyl acrylate.
15 . An image displaying device comprising
a displaying element; and
the optical film according to claim 14 , placed on an observer side relative to the displaying element.