Method for manufacturing pressure-sensitive adhesive film

Patent metadata

Field	Value
Publication number	US-11091672-B2
Application number	US-201716343615-A
Country	US
Kind code	B2
Filing date	Oct 31, 2017
Priority date	Nov 4, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

The present application relates to a method for manufacturing a pressure-sensitive adhesive film. In an embodiment, a method for manufacturing a pressure-sensitive adhesive film having a pressure-sensitive adhesive layer and a base layer includes applying a pressure-sensitive adhesive composition on at least one side of a base layer, where the pressure-sensitive adhesive composition comprises an isocyanate compound, a metal compound and an acrylic polymer; and drying the pressure-sensitive adhesive composition at a temperature of 100° C. or higher to form a pressure-sensitive adhesive layer on the base layer.

First claim

The invention claimed is:

1. A method for manufacturing a pressure-sensitive adhesive film, the pressure-sensitive adhesive film having a pressure-sensitive adhesive layer and a base layer, the method comprising:
applying a pressure-sensitive adhesive composition to at least one side of a base layer, wherein the pressure-sensitive adhesive composition comprises an isocyanate compound, a metal compound, and an acrylic polymer; and
drying the pressure-sensitive adhesive composition at a temperature of 110° C. to 130° C. to form a pressure-sensitive adhesive layer on the base layer,
wherein the metal compound comprises at least one metal of iron (Fe), zinc (Zn), zirconium (Zr), and a ligand that is diketonate,
wherein craters are present in the pressure-sensitive adhesive layer at a number of 5/m 2 or less,
wherein the craters have a diameter of 500 μm or less and a depth of 7 μm or less, and
wherein a color index of the pressure-sensitive adhesive layer ranges from 0.35 to 0.49.

2. The method for manufacturing a pressure-sensitive adhesive film according to claim 1 , wherein the metal compound comprises an iron (Fe) metal and a diketonate ligand.

3. The method for manufacturing a pressure-sensitive adhesive film according to claim 1 , wherein the acrylic polymer comprises a (meth)acrylate monomer having a hydroxy group as a polymerized unit.

4. The method for manufacturing a pressure-sensitive adhesive film according to claim 1 , wherein the isocyanate compound is a bifunctional or multifunctional compound.

5. The method for manufacturing a pressure-sensitive adhesive film according to claim 1 , wherein the base layer comprises any one of a polyester film, a polytetrafluoroethylene film, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a vinyl chloride copolymer film, or a polyimide film.

6. The method for manufacturing a pressure-sensitive adhesive film according to claim 1 , wherein the pressure-sensitive adhesive composition comprises 0.01 to 0.5 parts by weight of the metal compound and 1 to 20 parts by weight of the isocyanate compound, relative to 100 parts by weight of the acrylic polymer.

7. The method for manufacturing a pressure-sensitive adhesive film according to claim 1 , wherein the pressure-sensitive adhesive composition further comprises a curing retardant.

8. The method for manufacturing a pressure-sensitive adhesive film according to claim 7 , wherein the curing retardant is one or more of methyl acetoacetate, ethyl acetoacetate, octyl acetoacetate, oleyl acetoacetate, lauryl acetoacetate, stearyl acetoacetate, acetylacetone, 2,4-hexanedione or benzoylacetone.

9. The method for manufacturing a pressure-sensitive adhesive film according to claim 1 , further comprising:
laminating a release film on the pressure-sensitive adhesive layer after the drying step.

10. The method for manufacturing a pressure-sensitive adhesive film according to claim 9 , further comprising:
curing, after the lamination of the release film, at a temperature range of 30° C. to 60° C.

11. An optical laminate, comprising:
an optical film; and
a pressure-sensitive adhesive film, which is manufactured according to the method of claim 1 , formed on one side or both sides of the optical film,
wherein the pressure-sensitive adhesive film comprises a pressure-sensitive adhesive layer and a base layer,
wherein craters are present in the pressure-sensitive adhesive layer at a number of 5/m 2 or less,

wherein the craters have a diameter of 500 μm or less and a depth of 7μm or less, and
wherein a color index of the pressure-sensitive adhesive layer ranges from 0.35 to 0.49,
wherein the method comprises:
applying a pressure-sensitive adhesive composition to at least one side of the base layer, wherein the pressure-sensitive adhesive composition comprises an isocyanate compound, a metal compound, and an acrylic polymer; and
drying the pressure-sensitive adhesive composition at a temperature of 110° C. to 130° C. to form the pressure-sensitive adhesive layer on the base layer,
wherein the metal compound comprises at least one metal of iron (Fe), zinc (Zn), zirconium (Zr), and a ligand that is diketonate.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Hui Je
• Park Byung Su
• Kwon Yoon Kyung

Classifications

• C08K5/0091

  Complexes with metal-heteroatom-bonds · CPC title

• B32B2037/1253

  curable adhesive · CPC title

• B32B37/12

  characterised by using adhesives · CPC title

• C08G2170/40

  Compositions for pressure-sensitive adhesives · CPC title

• C09J175/04

  Polyurethanes · CPC title