Pressure-sensitive adhesive
AssigneeXinmei Fontana Holding (Hong Kong) Limited
InventorsJin Seo Min, Hui Je Lee, Hyun Woo Choi, Jae Sung Hong
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Abstract
The present application may provide a pressure-sensitive adhesive with excellent reliability, which is applied to a flexible device, thereby effectively responding to repeated deformation and recovery, causing no defects (for example, observation of deformation traces and the like) before and after deformation, having excellent cuttability, workability, and recoverability, and causing no lifting, delamination, and/or bubble generation. The present application may also provide a pressure-sensitive adhesive film or an optical film, and a flexible device such as a foldable device or a rollable device, comprising the pressure-sensitive adhesive.
Claims13
A pressure-sensitive adhesive comprising a pressure-sensitive adhesive polymer,
- wherein the pressure-sensitive adhesive polymer is an acrylic copolymer exhibiting a glass transition temperature and a melting temperature simultaneously, and
- an absolute value of the change rate ΔG1′ of the storage elastic modulus of 1,700 or less according to Equation 1 below:
- Δ
-
- G
-
- 1
- ′
- =
- (
- G
- 25
- ′
- -
- G
- -
- 20
- ′
- )
- /
- 45
- [
- Equation
-
- 1
- ]
- wherein, G′25 is the storage elastic modulus of the pressure-sensitive adhesive at 25° C., and G′−20 is the storage elastic modulus of the pressure-sensitive adhesive at −20° C.;
- wherein the storage elastic modulus at −20° C. is 70,000 to 100,000 Pa;
- wherein the storage elastic modulus at 25° C. is at least 10,000 Pa;
- wherein the storage elastic modulus at 60° C. is at least 10,000 Pa;
- wherein an absolute value of the change rate ΔG2′ of the storage elastic modulus according to Equation 2 below is 1,100 or less:
- Δ
-
- G
-
- 2
- ′
- =
- (
- G
- 60
- ′
- -
- G
- -
- 20
- ′
- )
- /
- 80
- [
- Equation
-
- 2
- ]
- wherein, G′60 is the storage elastic modulus of the pressure-sensitive adhesive at 60° C., and G′−20 is the storage elastic modulus of the pressure-sensitive adhesive at −20° C.;
- wherein an absolute value of the change rate ΔG3′ of the storage elastic modulus according to Equation 3 below is 600 or less:
- Δ
-
- G
-
- 3
- ′
- =
- (
- G
- 60
- ′
- -
- G
- 25
- ′
- )
- /
- 35
- [
- Equation
-
- 3
- ]
- wherein, ΔG3′ is the storage elastic modulus of the pressure-sensitive adhesive at 60° C., and G′25 is the storage elastic modulus of the pressure-sensitive adhesive at 25° C.;
- wherein the TM of Equation 4 below is at least 400 um·MPa−1:
- TM
- =
- D
- /
- G
- -
- 20
- ′
- [
- Equation
-
- 4
- ]
- wherein, D is the thickness of the pressure-sensitive adhesive, and G′−20 is the storage elastic modulus of the pressure-sensitive adhesive at −20° C.
Dependencies are inferred from the claim text.