Transparent supports for photographic products
AssigneePolaroid Corporation
InventorCharles K. Chiklis
Life of this patent
Estimating the term…
Abstract
Transparent elements useful as supports for photographic image-carrying and/or image-recording layers are provided comprising a polyester film base having an anti-reflection coating on one surface. Image-carrying and/or image-recording layers may be coated on the opposed surface. The polyester film base of the transparent element has an index of refraction of at least 1.6, and the anti-reflection coating comprises a fluorinated polymer and has an optical thickness of a quarter wave. An isocyanate in the anti-reflection coating or between said coating and the polyester film base increases the abrasion resistance of the fluorinated polymer anti-reflection coating.
Claims41
A transparent element comprising a polyester film base having coated directly on at least one surface thereof an anti-reflection coating comprising a fluorinated polymer, said anti-reflection coating having an index of refraction of about 1.3 to 1.45 and a quarter wave optical thickness, the index of refraction of said anti-reflection coating being at least 0.2 less than that of said polyester film base, said element including an isocyanate in said coating or between said coating and said transparent polyester support, said isocyanate being present in a quantity effective to increase the abrasion resistance of said fluorinated polymer coating.
A transparent element comprising a polyethylene terephthalate film base, said film base having an index of refraction of at least 1.6 and having coated directly on one surface thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.09 to about 0.11 micron, and an index of refraction at least about 0.20 less than the index of refraction of said polyethylene terephthalate, said element including an isocyanate in said coating or between said coating and said transparentpolyester support, said isocyanate being present in a quantity effective to increase the abrasion resistance of said fluorinated polymer coating.
A transparent element comprising a polyethylene terephthalate film base, said film having an index of refraction of at least 1.6 and having coated directly on both surfaces thereof an anti-reflection coating comprising a copolymer of vinylidene fluoride, said anti-reflection coating having a quarter wave optical thickness, a physical thickness of about 0.09 to about 0.11 micron, and an index of refraction at least about 0.20 less than the index of refraction of said polyethylene terephthalate, said element including an isocyanate in said coating or between said coating and said transparent polyester support, said isocyanate being present in a quantity effective to increase the abrasion resistance of said fluorinated polymer coating.
The method which comprises coating directly on a polyester self-supporting film having an index of refraction of at least 1.6, a solution comprising an organic solvent and at least one fluorinated polymer dissolved therein at a coverage which will provide a fluorinated polymer layer having a quarter wave optical dry thickness, and drying said coating by evaporating said solvent at an elevated temperature, the index of refraction of said coating being about 1.3 to 1.45 and at least 0.2 less than that of said polyester film, said coating solution being applied at room temperature and including an isocyanate in a quantity effective to increase the abrasion resistance of said fluorinated polymer.
Dependencies are inferred from the claim text.