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US 12,674,083 B2Granted
Pressure-sensitive adhesive layer
AssigneeLG Chem, Ltd.
InventorsByung Su Park, Hyun Cheol Kim, Hyon Gyu Park
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Abstract
The present application provides a pressure-sensitive adhesive layer comprising at least first and second regions having different physical properties, wherein the difference in physical properties, such as an elastic modulus or creep strain rate is maintained relatively large for each region, and the difference in physical properties, such as a peel force or recovery rate is maintained relatively small for each region.
Claims11
A pressure-sensitive adhesive layer, comprising:
- a first region and
- a second region,
- wherein an absolute value of a difference in storage elastic moduli of the first and second regions according to Equation 5 below is 10% or more, and
- wherein an absolute value of a difference in peel forces of the first and second regions according to Equation 8 below is 40% or less, and
- wherein the pressure-sensitive adhesive layer comprises a crystalline acrylic copolymer having a melting point of −20° C. or less:
- DM60=100×(M60.1−M60.2)/M60.2 [Equation 5]
- DPG=100×(PG,1−PG,2)/PG,2 [Equation 8]
- wherein, DM60 is the difference in the storage elastic moduli, M60.1 is a storage elastic modulus of the first region at 60° C., and M60.2 is a storage elastic modulus of the second region at 60° C.;
- and DPG is the difference in the peel force, PG,1 is a peel force of the first region to a glass, and PG,2 is a peel force of the second region to the glass.
6 more elements
Dependencies are inferred from the claim text.