Adhesive film and process for producing the same

Patent metadata

Field	Value
Publication number	US-2017283667-A1
Application number	US-201615312880-A
Country	US
Kind code	A1
Filing date	May 2, 2016
Priority date	Mar 9, 2016
Publication date	Oct 5, 2017
Grant date	—

Abstract

The present invention provides an adhesive film hardly suffering from fisheyes and deposition of dirt and dusts thereonto and having excellent mechanical strength and heat resistance as well as good adhesion properties, which can be suitably used as various surface protective films, etc. The present invention relates to an adhesive film comprising a polyester film and an adhesive layer formed on at least one surface of the polyester film, in which the adhesive layer comprises a resin having a glass transition point of not higher than 0° C., and an antistatic agent, and a thickness of the adhesive layer is not more than 10 μm.

First claim

1 . An adhesive film comprising a polyester film and an adhesive layer formed on at least one surface of the polyester film, in which the adhesive layer comprises a resin having a glass transition point of not higher than 0° C. and an antistatic agent, and a thickness of the adhesive layer is not more than 10 μm.

2 . The adhesive film according to claim 1 , wherein the adhesive layer comprises a crosslinking agent.

3 . The adhesive film according to claim 2 , wherein the crosslinking agent is at least one compound selected from the group consisting of a melamine compound, an isocyanate-based compound, an epoxy compound, an oxazoline compound, a carbodiimide-based compound, a silane coupling compound, a hydrazide compound and an aziridine compound.

4 . The adhesive film according to claim 1 , further comprising a functional layer formed on a surface of the polyester film which is opposite to the surface provided with the adhesive layer.

5 . The adhesive film according to claim 1 , wherein the resin having a glass transition point of not higher than 0° C. is a polyester resin.

6 . The adhesive film according to claim 5 , wherein the resin having a glass transition point of not higher than 0° C. is a polyester resin comprising an aliphatic polycarboxylic acid.

7 . The adhesive film according to claim 1 , wherein the resin having a glass transition point of not higher than 0° C. is a (meth)acrylic resin comprising a (meth)acrylate unit comprising an alkyl group having not less than 4 carbon atoms at an ester end thereof.

8 . The adhesive film according to claim 1 , wherein the antistatic agent is a polymer-type antistatic agent.

9 . The adhesive film according to claim 8 , wherein the polymer-type antistatic agent comprises a conductive polymer.

10 . The adhesive film according to claim 1 , wherein the adhesive layer has an adhesion strength to a polymethyl methacrylate plate of 1 to 5000 mN/cm.

11 . A process for producing an adhesive film, comprising the steps of:
forming a coating layer on at least one surface of a polyester film to prepare a coated film, in which the coating layer comprises a resin having a glass transition point of not higher than 0° C. and an antistatic agent; and drawing the coated film in at least one direction thereof.

12 . The process for producing an adhesive film according to claim 11 , wherein the adhesive layer comprises a crosslinking agent.

13 . The process for producing an adhesive film according to claim 12 , wherein the crosslinking agent is at least one compound selected from the group consisting of a melamine compound, an isocyanate-based compound, an epoxy compound, an oxazoline compound, a carbodiimide-based compound, a silane coupling compound, a hydrazide compound and an aziridine compound.

14 . The process for producing an adhesive film according to claim 11 , wherein the adhesive film further comprises a functional layer formed on a surface of the polyester film which is opposite to the surface provided with the adhesive layer.

15 . The process for producing an adhesive film according to claim 11 , wherein the resin having a glass transition point of not higher than 0° C. is a polyester resin.

16 . The process for producing an adhesive film according to claim 15 , wherein the resin having a glass transition point of not higher than 0° C. is a polyester resin comprising an aliphatic polycarboxylic acid.

17 . The process for producing an adhesive film according to claim 11 , wherein the resin having a glass transition point of not higher than 0° C. is a (meth)acrylic resin comprising a (meth)acrylate unit comprising an alkyl group having not less than 4 carbon atoms at an ester end thereof.

18 . The process for producing an adhesive film according to claim 11 , wherein the antistatic agent is a polymer-type antistatic agent.

19 . The process for producing an adhesive film according to claim 18 , wherein the polymer-type antistatic agent comprises a conductive polymer.

20 . The process for producing an adhesive film according to claim 11 , wherein the adhesive layer has an adhesion strength to a polymethyl methacrylate plate of 1 to 5000 mN/cm.

Assignees

• Mitsubishi Chem Corp

Inventors

• Kawasaki Taishi

Classifications

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• B05D5/10

  to obtain an adhesive surface · CPC title

• C09J133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C09D7/48

  Stabilisers against degradation by oxygen, light or heat · CPC title

• C08K3/346

  Clay · CPC title