Antistatic Laminated Polyester Film

May 1, 2007

Patented is an antistatic film comprising a polyester film and an antistatic coating film on at least one surface of the polyester film. The antistatic coating film features a polymer with a polymerized unit represented by the following formula (1): wherein R1 and R2 each independently represent a hydrogen atom or a methyl group, R3 represents an alkylene group having 2 to 10 carbon atoms, R4 and R5 each independently represent an alkyl group having 1 to 5 carbon atoms, R6 represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a hydroxyalkyl group having 2 to 10 carbon atoms, and Y- represents a halogen ion, a halogenated alkyl ion, a nitrate ion, a sulfate ion, an alkyl sulfate ion, a sulfonate ion or an alkyl sulfonate ion. The polymer also includes a polymerized unit derived from a reactive acrylic monomer in addition to the polymerized unit represented by the formula (1). The antistatic coating film comprises a binder resin in addition to the polymer. The amounts of the polymer and the binder resin are 10 to 90 weight % and 10 to 90 weight %, respectively, based on their total. The binder resin is at least one selected from the group consisting of a polyester resin and an acrylic resin. The antistatic coating film further comprises 3 to 25 parts by weight of polymer with an oxazoline group based on 100 parts by weight of the total of the polymer and the binder resin.
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