Release film and process for producing the film

Abstract

A film having an antistatic releasing agent layer comprising fiber-shaped carbon and disposed on at least one of the faces of a substrate film, a release film having a releasing agent layer disposed on one face of a substrate and an antistatic layer which comprises a cured product of a resin composition of the active energy ray curing type comprising fiber-shaped carbon or a combination of fiber-shaped carbon and an electrically conductive macromolecular compound and is disposed on the other face of the substrate film, and processes for producing the films. The release films have a relatively small thickness of the antistatic layer, exhibit the stable antistatic function, are excellent in smoothness, do not adversely affect hardening of the resin releasing agent, exhibit the excellent releasing function and provide the excellent productivity.

Description

Claims

1. A release film which comprises an antistatic layer comprising fiber-shaped carbon and a substrate film, wherein the fiber-shaped carbon is disposed on at least one face of the substrate film.

2. The release film according to claim 1, wherein the antistatic layer comprising fiber-shaped carbon is an antistatic releasing agent layer comprising the fiber-shaped carbon and a releasing agent.

3. The release film according to claim 2, wherein the releasing agent is a silicone-based releasing agent.

4. The release film according to claim 2, wherein the releasing agent is an agent selected from the group consisting of a releasing agents based on a compound having a long chain alkyl group, an alkyd resin-based releasing agent, an olefin resin-based releasing agent, rubber-based releasing agent and an acrylic releasing agent.

5. The release film according to claim 2, wherein the fiber-shaped carbon is contained in the antistatic layer in the amount of 0.1 to 30% by mass.

6. The release film according to claim 2, wherein the antistatic layer has a surface resistivity of 1012 Ω/□ or smaller.

7. The release film according to claim 2, wherein the antistatic layer has a thickness of 0.01 to 3 μm.

8. A process for producing a release film which comprises coating at least one face of a substrate film with a coating fluid comprising a releasing agent and fiber-shaped carbon to form a coating layer and drying the coating layer to form an antistatic releasing agent layer.

9. The release film according to claim 1, wherein the antistatic layer comprising fiber-shaped carbon comprises a cured product of a resin composition of an active energy ray curing type comprising fiber-shaped carbon, and a releasing agent layer which is disposed on a face of the substrate film opposite to a face having the antistatic layer disposed thereon.

10. The release film according to claim 9, wherein the resin composition of an active energy ray curing type further comprises an electrically conductive macromolecular compound.

11. The release film according to claim 10, wherein the electrically conductive macromolecular compound is at least one compound selected from the group consisting of a polyacetylene-based compound, polythiophene-based compound, polyaniline-based compound, polypyrrol-based compound, poly(phenylenevinylene)-based compound, poly(vinylene sulfide)-based compound, poly(p-phenylene sulfide)-based compound and poly(thienylenevinylene)-based compound.

12. The release film according to claim 9, wherein the fiber-shaped carbon is contained in the cured product in the amount of 0.1 to 30% by mass.

13. The release film according to claim 10, wherein the electrically conductive macromolecular compound is contained in the cured product in the amount of 0.01 to 10% by mass.

14. The release film according to claim 9, wherein the antistatic layer has a surface resistivity of 1013 Ω/□ or smaller.

15. The release film according to claim 9, wherein the antistatic layer has a thickness of 0.01 to 3 μm.

16. The release film according to claim 9, wherein the releasing agent is a silicone-based releasing agent.

17. The release film according to claim 9, wherein the releasing agent is selected from the group consisting of a releasing agent based on a compound having a long chain alkyl group, an alkyd resin-based releasing agent, an olefin resin-based releasing agent, a rubber-based releasing agent and an acrylic releasing agent.

18. The release film according to claim 9, wherein the releasing agent layer has a thickness of is 0.01 to 3 μm.

19. A process for producing a release film which comprises forming an antistatic layer on one face of a substrate film by coating the face with a resin composition of an active energy ray curing type comprising fiber-shaped carbon to form a coating layer, drying the coating layer to form a coating film and irradiating the coating film with an active energy ray to cure the coating film, and forming a releasing agent layer on an other face of the substrate film by coating the other face with a coating fluid comprising a releasing agent and drying the coating fluid to form a layer.

20. The release film according to claim 1, wherein the fiber-shaped carbon is a carbon nano tube which is a cylindrical hollow fiber-shaped material having an average outer diameter of about 0.5 to 120 nm and a average length of about 50 nm or greater.

21. The release film according to claim 2, wherein the fiber-shaped carbon nano tube which is a cylindrical hollow fiber-shaped material having an average outer diameter of about 0.5 to 120 nm and a average length of about 50 nm or greater.

22. The release film according to claim 21, wherein the releasing agent is a silicon-based releasing agent.

23. The release film according to claim 2, wherein the carbon nano tube is contained in the antistatic layer in the amount of 0.1 to 30% by mass; the antistatic layer has a surface resistivity of 1012 Ω/□ or smaller; and the antistatic layer has a thickness of 0.01 to 3 μm.

24. The release film according to claim 9, wherein the fiber-shaped carbon nano tube which is a cylindrical hollow fiber-shaped material having an average outer diameter of about 0.5 to 120 nm and an average length of about 50 nm or greater.

25. The release film according to claim 11, wherein the fiber-shaped carbon is a carbon nano tube which is a cylindrical hollow fiber-shaped material having an average outer diameter of about 0.5 to 120 nm and an average length of about 50 nm or greater.

26. The release film according to claim 25, wherein the carbon nano tube is contained in the antistatic layer in the amount 0.1 to 30% by mass; the electrically conductive macromolecular compound is contained in the cured product in an amount of 0.01 to 10% by mass; the antistatic layer has a surface resistivity of 1013 Ω/□ or smaller; and the antistatic layer has a thickness of 0.01 to 3 μm.