Process for producing polymer film

Patent metadata

Field	Value
Publication number	US-10829601-B2
Application number	US-201615736616-A
Country	US
Kind code	B2
Filing date	Jun 17, 2016
Priority date	Jun 18, 2015
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

The present invention provides a process for producing a polymer film at high productivity: during a process for drying gripped portions of both edges of a gel film, a first heat treatment is performed by blowing hot air in the film width direction and a second heat treatment is performed by blowing hot air at gripped portions of both edges of the gel film in a direction parallel to the film running direction.

First claim

What is claimed is:

1. A process for producing a polymer film, the process comprising:
preparing a solution comprising a polymer, a precursor of the polymer, or a curing agent and the precursor of the polymer;
flow-casting the solution on a support body to mold the solution into a film;
heating the film such that a gel film is formed;
peeling the gel film from the support body: and
applying a heat treatment to the gel film while gripping the gel film at both edge portions in a film width direction,
wherein the heat treatment comprises a first heat treatment from a first heat treatment section that uniformly blows hot air in the width direction of the gel film and a second heat treatment from a second heat treatment section that continuously blows hot air to gripped edge portions in a direction parallel to a running direction of the gel film,
wherein the second heat treatment section is arranged between the first heat treatment section and the gel film; and wherein the first heat treatment is performed at a higher temperature than the second heat treatment.

2. The process of claim 1 , wherein the first heat treatment is performed at a temperature T 1 , and the second heat treatment is performed at a temperature T 2 , and wherein T 1 -T 2 is from 0.1° C. to 30° C.

3. The process of claim 2 , wherein the first heat treatment is performed in the first heat treatment section positioned at a distance D 1 from the gel film, and the second heat treatment is performed in the second heat treatment section positioned at a distance D 2 from the gel film, and wherein a ratio of D 2 /D 1 is 0.30 or less.

4. The process of claim 3 , wherein the distance D 2 is from 3 mm to 100 mm.

5. The process of claim 2 , wherein the polymer film is a polyimide film.

6. The process of claim 2 , wherein the first and second heat treatments are performed simultaneously.

7. The process of claim 2 , wherein the first heat treatment is performed before the second heat treatment.

8. The process of claim 2 , wherein the temperature T 1 is from 200° C. to 600° C.

9. The process of claim 2 , wherein the temperature T 1 is from 250° C. to 500° C.

10. The process of claim 1 , wherein the first heat treatment is performed in the first heat treatment section positioned at a distance D 1 from the gel film, and the second heat treatment is performed in the second heat treatment section positioned at a distance D 2 from the gel film, and wherein a ratio of D 2 /D 1 is 0.30 or less.

11. The process of claim 10 , wherein the polymer film is a polyimide film.

12. The process of claim 10 , wherein the first and second heat treatments are performed simultaneously.

13. The process of claim 10 , wherein the first heat treatment is performed before the second heat treatment.

14. The process of claim 10 , wherein the distance D 2 is from 3 mm to 100 mm.

15. The process of claim 10 , wherein the distance D 2 is from 5 mm to 50 mm.

16. The process of claim 1 , wherein the polymer film is a polyimide film.

17. The process of claim 16 , wherein the first and second heat treatments are performed simultaneously.

18. The process of claim 16 , wherein the first heat treatment is performed before the second heat treatment.

19. The process of claim 1 , wherein the first and second heat treatments are performed simultaneously.

20. The process of claim 1 , wherein the first heat treatment is performed before the second heat treatment.

Assignees

• Kaneka Corp

Inventors

• Uno Takashi
• Hanada Koji
• Niki Hayato

Classifications

• C08J2379/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• C08G73/1042

  Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds · CPC title

• C09D179/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• C08G73/1071

  Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain · CPC title

• C08G73/105

  with oxygen only in the diamino moiety · CPC title