Adhesive sheet

Abstract

To provide an adhesive sheet used in an electronic component transfer process, which preferably exhibits release properties upon irradiation with laser light of a predetermined wavelength. [Solution] An adhesive sheet according to an embodiment of the present invention is an adhesive sheet used in an electronic component transfer process, comprising a transparent layer and an absorbing layer disposed on one side of the transparent layer, wherein the transmittance of the transparent layer to light with a wavelength of 248 nm is 50% or more, the transmittance of the absorbing layer to light with a wavelength of 248 nm is 5% or less, and the tensile modulus of the transparent layer at 23°C is 0.1 MPa or more.

Claims

1. It comprises a permeable layer and an absorbing layer disposed on one side of the permeable layer, The transmittance of the transparent layer to light with a wavelength of 248 nm is 50% or more. The transmittance of the absorption layer at a wavelength of 248 nm is 5% or less. The tensile modulus of the permeable layer at 23°C is 0.1 MPa or higher. Adhesive sheets used in the electronic component transfer process.

2. The adhesive sheet according to claim 1, wherein the cured tensile modulus of the absorbent layer at 23°C is 3.0 MPa or more.

3. The adhesive sheet according to claim 1, wherein the permeable layer contains a hydroxyl group-containing polymer.

4. The adhesive sheet according to claim 1, wherein the permeable layer comprises a polymer that does not have a carbonyl group in its main chain.

5. The adhesive sheet according to claim 3, wherein the hydroxyl group-containing polymer does not have a carbonyl group in its main chain.

6. The adhesive sheet according to claim 1, wherein the permeable layer contains an isocyanate-based crosslinking agent.

7. The adhesive sheet according to claim 6, wherein the isocyanate-based crosslinking agent has an alicyclic structure.

8. The adhesive sheet according to claim 1, wherein the absorption layer includes an active energy ray curing adhesive.

9. The adhesive sheet according to claim 8, wherein the active energy ray curable adhesive comprises a polymer having a functional group having a carbon-carbon multiple bond.

10. The adhesive sheet according to claim 9, wherein the polymer having a functional group having a carbon-carbon multiple bond is a reaction product of a hydroxyl group-containing acrylic polymer and an isocyanate compound having both a radiation-polymerizable carbon-carbon double bond and an isocyanate group.

11. The adhesive sheet according to claim 1, wherein the electronic component is a mini LED or a micro LED.

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