Mold release film and method for producing laminate

Patent metadata

Field	Value
Publication number	US-11724423-B2
Application number	US-202217718173-A
Country	US
Kind code	B2
Filing date	Apr 11, 2022
Priority date	Nov 30, 2017
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

Provided is a mold release film capable of transferring a concave-convex structure to the surface of an adhesive film.

First claim

The invention claimed is:

1. A method for producing a laminate, the method comprising
sequentially laminating a support, an adhesive sheet including an adhesive layer, and the mold release film, thereby producing the laminate,
wherein the mold release film comprises a concave-convex layer having a concave-convex structure on the surface of at least one surface side of a substrate,
wherein the concave-convex layer is a cured product formed of a phase separation composition comprising a component A, a component B, a crosslinking initiator C, and a mixed solution Z composed of a solution X and a solution Y,
component A and the component B both comprise an acrylic polymer,
a boiling point of the solution Y is higher than that of the solution X,
and the concave-convex structure comprises a structure in which a convex portion of the concave-convex structure forms an irregular and continuous shape in a plan view, and
wherein the concave-convex structure is transferred to one surface of the adhesive layer to be laminated with the mold release film by laminating the adhesive layer on the surface of the concave-convex layer of the mold release film (referred to as “concave-convex layer surface”), and the support is laminated on another surface of the adhesive sheet.

2. The method for producing a laminate according to claim 1 , wherein an adhesive agent composition is coated on the concave-convex layer surface, and the support is bonded therewith, whereby the adhesive sheet having the adhesive layer composed of the adhesive agent composition is laminated on the concave-convex layer surface.

3. The method for producing a laminate according to claim 1 , wherein an adhesive agent composition is coated on the surface of the support, and the mold release film is bonded and laminated such that the concave-convex layer surface of the mold release film is brought into contact with the coating surface of the adhesive agent composition.

4. The method for producing a laminate according to claim 1 , wherein the adhesive sheet is laminated between the support and the mold release film such that the concave-convex layer surface of the mold release film is brought into contact with the adhesive sheet.

5. The method for producing a laminate according to claim 1 ,
wherein the concave-convex structure of the mold release film has an area ratio of the convex portion to the surface of 10 to 90% and a maximum height difference of 0.5 μm or more, and
the maximum height difference in the concave-convex structure can be determined as the maximum value of the difference between the minimal value of the concave portion and the maximal value around the concave portion, or the difference between the maximal value of the convex portion and the minimal value around the convex portion.

6. The method for producing a laminate according to claim 1 , wherein the substrate is a biaxially stretched polyester film.

Assignees

• Mitsubishi Chem Corp

Inventors

• Sasaki Nobuaki
• Sato Yoshihide

Classifications

• B29C33/68 Primary

  Release sheets · CPC title

• B32B3/30

  characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B27/08

  of synthetic resin · CPC title

• C09J7/403 Primary

  characterised by the structure of the release feature · CPC title