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US 11,680,191 B2Granted
Optical laminate
AssigneeShanjin Optoelectronics (Suzhou) Co., Ltd.
InventorsDong Hun Lee, Seul Ki Han, Hyun Hee Son
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Abstract
An optical laminate is provided where stable durability is secured even at a high temperature, particularly an ultra-high temperature of about 100° C. or higher, no white turbidity is caused, other physical properties required for the optical laminate are also excellent, and even in the case of being disposed adjacent to the electrode, corrosion of the relevant electrode or the like is not induced.
Claims20
An optical laminate comprising
- an optical film;
- and
- a pressure-sensitive adhesive layer formed on a side of the optical film,
- wherein the pressure-sensitive adhesive layer comprises a pressure-sensitive adhesive polymer having an alkyl (meth)acrylate unit having an alkyl group with 4 or more carbon atoms, an alkyl (meth)acrylate unit having an alkyl group with 3 or less carbon atoms, an aromatic group-containing monomer unit and a polar group-containing monomer unit that has a carboxyl group and an organic salt, and the polar group-containing monomer unit is present in an amount of 1.5 to 4.5 parts by weight relative to 100 parts by weight of the alkyl (meth)acrylate unit having an alkyl group with 4 or more carbon atoms, the pressure-sensitive adhesive layer has a room temperature storage elastic modulus of 0.07 MPa or more and a gel fraction of 80 wt % or more according to Equation 1 below:
- Gel fraction=B/A×100 [Equation 1]
- wherein, B/A is a ratio of a dry mass (B) (unit:
- g) of an insoluble fraction recovered after immersing the pressure-sensitive adhesive layer in ethyl acetate at room temperature for 24 hours to a mass (unit:
- g) (A) of the pressure-sensitive adhesive layer before immersing the pressure-sensitive adhesive layer in ethyl acetate, wherein an amount of the alkyl (meth)acrylate unit having an alkyl group with 4 or more carbon atoms in the pressure-sensitive adhesive polymer is in a range of 50 wt % to 70 wt %, wherein the alkyl (meth)acrylate unit having an alkyl group with 3 or less carbon atoms is included in the pressure-sensitive adhesive polymer in an amount of 30 to 65 parts by weight relative to 100 parts by weight of the alkyl (meth)acrylate unit having an alkyl group with 4 or more carbon atoms.
5 more elements
Dependencies are inferred from the claim text.