Polyester film
AssigneeToray Industries, Inc.
InventorsKenji Tsunashima, Takashi Mimura, Takashi Sumiya, Hiroshi Kuboyama
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Abstract
The present invention is directed to a polyester film comprising at least at its surface portion oriented sulfonic acid groups and/or salts thereof with an orientation degree of 5-100, which has an excellent adhesiveness, especially excellent anti-alkaline adhesiveness. The present invention also makes it possible to provide a polyester film having, in addition to the excellent adhesiveness, an excellent transparency, antistatic property and waterproof property.
Claims16
A composite polyester film comprising a polyester-based film and a surface layer laminated on at least one surface of the base film, the surface layer containing oriented styrenesulfonic acid groups and/or salts thereof with an orientation degree of 5-100.
A composite polyester film comprising:
- a base film containing a styrenesulfonic acid polymer or copolymer having sulfonic acid groups and/or salts thereof, the content of the styrenesulfonic acid polymer or copolymer being 2 ppm to 20% by weight;
- and
- at least one surface film laminated on at least one surface of the base film, wherein said surface film comprises a polyester film comprising at least in its surface portion oriented styrenesulfonic acid groups and/or salts thereof with an orientation degree of 5-100.
Dependencies are inferred from the claim text.