Printed polyester films
AssigneeTeijin Limited
InventorsKinji Hasegawa, Yukio Mitsuishi, Shigeyoshi Masuda
Life of this patent
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Abstract
A printed polyester film comprising (I) a biaxially oriented polyester film containing more than 2% by weight to 10% by weight of polyethylene glycol having a molecular weight of 5,000 to 200,000 and a density of 1.390 to 1.410, said film being composed of a polyester in which at least 80% by weight of the entire structural units consists of an ethylene terephthalate unit, and (II) a printed layer formed by a printing ink containing a cellulose derivative as a binder, said printed layer being applied to at least a part of the surface of the film (I), and a process for preparation thereof.
Claims9
A printed polyester film comprising
- (I) a biaxially oriented polyester film which is a blend of (1) a polyethylene glycol containing polyester with (2) a polyester comprising at least 80% by weight, based on the entire structural units, of ethylene terephthalate units, said blend containing from 2.1% to 5% by weight of the blend of said polyethylene glycol having a molecular weight in the range of from 10,000 to 100,000 and having a density in the range of from 1.392 g/cm.sup.3 to 1.403/cm.sup.3, and
- (II) a printed layer formed by a printing ink containing a cellulose derivative as a binder, said printed layer being applied to at least a part of the surface of the film (I).
A printed polyester film comprising
- (I) a biaxially oriented polyester film having a density of from 1.390 to 1.410 g/cm.sup.3 which is prepared by mixing a polyethylene glycol-containing polyester master polymer with a polyester comprising at least 80% by weight, based on the entire structural units, of an ethylene terephthalate unit so that the content of polyethylene glycol in the final mixture becomes from 2.1% to 5% by weight, said master polymer being obtained by adding 7.5 to 20% by weight of polyethylene glycol having a molecular weight of 10,000 to 100,000 to a polyester comprising at least 80% by weight, based on the entire structural units of an ethylene terephthalate unit before the completion of the polymerization and then completing the polymerization;
- melt-extruding the resulting mixture into a film form;
- stretching the film at a temperature of 80.degree. to 120.degree. C. to 3.0 to 4.5 times in the machine direction and to 3.0 to 4.5 times in the transverse direction;
- and heat-setting the resulting stretched film at a temperature of 220.degree. to 245.degree. for 2 to 60 seconds, and
- (II) a printed layer formed by a printing ink containing a cellulose derivative as a binder, said printed layer being applied to at least a part of the surface of the film (I).
A printed polyester film comprising
- (I) a biaxially oriented polyester film having a density of from 1.390 g/cm.sup.3 to 1.410 g/cm.sup.3 and a crystal size in the direction of the 100 plane, determined by X-ray diffraction, of at least 55 angstroms and comprising a blend of (1) a polyethylene glycol-containing polyester master batch with (2) a polyester comprising at least 80% by weight, based on the entire structural units, of ethylene terephthalate units,
- wherein the polyethylene glycol of the master batch has a molecular weight of 10,000 to 100,000, the polyester of the master batch comprises at least 80% by weight, based on the entire structural units, of an ethylene terephthalate unit, the amount of the polyethylene glycol in the master batch is from 4 to 40% by weight and the total amount of the polyethylene glycol in the blend of (1) and (2) is more than 2% by weight but not more than 10% by weight, and
- (II) a printed layer formed by a printing ink containing a cellulose derivative as a binder, said printed layer being applied to at least a part of the surface of the film (I).
Dependencies are inferred from the claim text.