Method for manufacturing resin thin film stripped pieces

Patent metadata

Field	Value
Publication number	US-11634636-B2
Application number	US-201916982124-A
Country	US
Kind code	B2
Filing date	Mar 26, 2019
Priority date	Mar 30, 2018
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

A method for producing flakes of a resin thin film including: a step (1) of forming a resin thin film on a substrate film to obtain a multilayer film; a step (2) of pressing the multilayer film by a member having a concavo-convex shape to form cracks in the resin thin film; and a step (3) of stripping the resin thin film from the substrate film to obtain flakes. The step (2) is preferably performed with a pressing pressure of 100 MPa or less. The resin thin film is preferably formed of a cured product of a photocurable liquid crystal composition. The resin thin film is preferably a cholesteric resin layer.

First claim

The invention claimed is:

1. A method for producing flakes of a resin thin film comprising:
a step (1) of forming a resin thin film on a substrate film to obtain a multilayer film;
a step (2) of, after the step (1), forming cracks in a grid pattern in the resin thin film by pressing the multilayer film with a plurality of members each having a concavo-convex shape; and
a step (3) of, after the step (2), stripping the resin thin film from the substrate film to obtain flakes,
wherein the resin thin film is a cholesteric resin layer.

2. The method for producing flakes of a resin thin film according to claim 1 , wherein the step (2) is performed with a pressing pressure of 100 MPa or less.

3. The method for producing flakes of a resin thin film according to claim 1 , wherein the resin thin film is formed of a cured product of a photocurable liquid crystal composition.

4. The method for producing flakes of a resin thin film according to claim 1 , wherein
the step (3) includes:
a step (3A) of spraying a fluid onto a portion of the resin thin film where the cracks have been formed to blow away the resin thin film having the cracks formed therein;
a step (3B) of collecting the blown resin thin film; and
a step (3C) of pulverizing the collected resin thin film.

5. A method for producing flakes of a resin thin film comprising:
a step (1) of forming a resin thin film on a substrate film to obtain a multilayer film;
a step (2) of, after the step (1), forming cracks in a grid pattern in the resin thin film by pressing the multilayer film with a plurality of members each having a concavo-convex shape; and
a step (3) of, after the step (2), stripping the resin thin film from the substrate film to obtain flakes, wherein
the step (3) includes:
a step (3A) of spraying a fluid onto a portion of the resin thin film where the cracks have been formed to blow away the resin thin film having the cracks formed therein;
a step (3B) of collecting the blown resin thin film; and
a step (3C) of pulverizing the collected resin thin film.

6. The method for producing flakes of a resin thin film according to claim 5 , wherein the step (2) is performed with a pressing pressure of 100 MPa or less.

7. The method for producing flakes of a resin thin film according to claim 5 , wherein the resin thin film is formed of a cured product of a photocurable liquid crystal composition.

Assignees

• Zeon Corp

Inventors

• Warabiminami Yusuke

Classifications

• G02F1/133536

  Reflective polarizers (G02F1/13362 takes precedence) · CPC title

• C09K19/24

  linked by a chain containing nitrogen-to-nitrogen bonds · CPC title

• B42D25/364

  Liquid crystals · CPC title

• B29C59/026

  of layered or coated substantially flat surfaces · CPC title

• B29C2793/009

  after shaping · CPC title