Polyester film for fabrication
AssigneeTeijin Limited
InventorsTadashi Ono, Kinji Hasegawa, Takeo Asai, Yoji Murakami
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Abstract
A biaxially oriented polyester film comprising a copolyester which contains a lubricant having an average particle diameter of no greater than 2.5 .mu.m and has a melting point of from 210.degree. to 245.degree. C., the film having a plane orientation coefficient of from 0.10 to 0.16, a thermal shrinkage at 150.degree. C. of no higher than 10%, and a density of lower than 1.385 g/cm.sup.3, and optionally a refractive index in a direction of thickness of from 1.495 to 1.530 as well as a film plane refractive index of from 1.61 to 1.66 in all directions.
Claims5
A biaxially oriented polyester film for laminating a metal plate to be used for manufacturing a vessel or can comprising a copolyethylene terephthalate which contains a lubricant having an average particle of diameter of no greater than 2.5 .mu.m and has a melting point of from 210.degree. to 245.degree. C., said film having a thickness of from 10 to 75 .mu.m, a plane orientation coefficient of from 0.10 to 0.16, a thermal shrinkage at 150.degree. C. of no higher than 10%, a density of lower than 1.385 g/cm.sup.3, a refractive index in a direction of thickness of from 1.495 to 1.530, and a film plane refractive index of from 1.61 to 1.66 in all directions, wherein a current value measured in a rust prevention test on a vessel or can prepared by deep drawing from a metal plate on which said film is laminated is no higher than 0.2 mA, said current value being measured in accordance with the test method as described in the Resistance to Impact Fracture test recited in the specification.
Dependencies are inferred from the claim text.