Magnetic card comprising a polyester film, ultra-violet curing ink layer, a magnetic layer, and an antistatic adhesive layer comprising specified polymers
AssigneeTeijin Limited
InventorsMasayuki Fukuda, Sadayoshi Miura
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Abstract
The present invention relates to a polyester film having an antistatic highly adhesive layer and a process for producing the film, said layer comprising a copolymer (A) and a (co)polymer (B), said copolymer (A) being obtained by copolymerizing ##STR1## N-methylol acrylamide, and optionally an ethylenic compound having a carboxy group, and optionally a comonomer, and said (co)polymer (B) being obtained by copolymerizing ##STR2## and optionally a comonomer. The polyester film of the present invention is useful for magnetic cards and the like.
Claims5
A magnetic card comprising an antistatic adhesive film, an ink layer made of an ultra-violet-curing ink and a magnetic layer, both of said layers being provided on the adhesive film, wherein the adhesive film comprises a polyester film and an antistatic adhesive layer provided on at least one side of the polyester film, said adhesive layer comprising a copolymer (A) and a polymer (B) at a weight ratio of 95:5 to 50:50, the copolymer (A) having a second order transition temperature (Tg) of 10.degree.-80.degree. C. and being obtained by copolymerizing
- (a) 70-99% by weight of a compound represented by the following formula (I) ##STR11## wherein R.sub.1 is a hydrogen atom or a methyl group;
- and R.sub.2 is --COOR.sub.3 in which R.sub.3 is a straight or branched alkyl group of 1-20 carbon atoms), or R.sub.2 is ##STR12## or --C.tbd.N, (b) 1-10% by weight of the compound N-methylol(meth)acrylamide,
- (c) 0-5% by weight of an ethylenic compound having a carboxy group in the molecule, other than the compound (I), and
- (d) 0-29% by weight of another compound copolymerizable with the compounds of (a) to (c), the total of the compounds of (a) to (d) being 100% by weight,
- and the copolymer (B) having the molecular weight of 5,000 or more and being obtained by polymerizing or copolymerizing
- (e) 30-100% by weight of a compound represented by the following formula (II) ##STR13## wherein R.sub.4, R.sub.5 and R.sub.6 are independently a hydrogen atom or a lower alkyl group;
- R.sub.7 is a bivalent organic group;
- X is an alkali metal or --NH(R.sub.8).sub.3 in which R.sub.8 is a hydrogen atom or a lower alkyl group;
- and n is 0 or 1, and
- (f) 0-70% by weight of another compound copolymerizable with the compound (e), the total of the compounds of (e) and (f) being 100% by weight.
Dependencies are inferred from the claim text.