| 摘要 |
The present invention relates to a method for tinting optical films comprising:
(a) coating onto an optical film a liquid coating composition comprising, in a water miscible organic solvent, 1 part of cellulose acetate butyrate (CAB), from 0.1 to 2 parts by weight of dicyclohexyl phthalate, from 0.1 to 1 part by weight of isocyanatoalkyltrialcoxysilane, and at least 0.5 moles of H 2 O per mole of hydrolysable alcoxy groups of isocyanatoalkyltrialcoxysilane,
(b) submitting said coated composition to a drying step so as to form an image-receiving CAB layer on the optical film,
(c) printing the dried image-receiving CAB layer with a sublimation dye by means of a thermal transfer printer,
(d) submitting the resulting printed film and image-receiving CAB layer to a thermal treatment so as to transfer the printed sublimation dye from the image-receiving layer to the underlying optical film, and
(e) removing the image-receiving CAB layer by means of a suitable solvent. The present invention is also drawn to a tinted optical film obtained by such a method, an optical article containing such a film and a liquid coating composition for implementing the method. |
