| 摘要 |
PURPOSE:To obtain the titled polarizing film having fine finished appearance by forming a mixture of a reducing agent with a digenetic dye and a specified substance on one side of an iodine-contg. polarizing film having a support formed on the other side and treating the film at high temp. and humidity. CONSTITUTION:An aqueous soln. contg. a mixture consisting of a reducing agent such as NaOH, a digenetic dye such as ''Direct Black 22'' and a water-soluble or water-swellable substance in which the reducing agent and the dye can be diffused and moved, e.g. starch in (0.5-2):(0.5-2):(1-6) weight ratio is applied to one side of an iodine-contg. polarizing film such as a polyvinyl alcohol film having a support of 25-500mum thickness such as a polyester film stuck to the other side so as to adjust the solid matter content to 0.1-20g/m<2>. The polarizing film is then treated at 40-90 deg.C high temp. and 70-98% high relative humidity for 1-60min to reduce iodine molecules in the applied part. The iodine molecules in the part are removed, and the digenetic dye is allowed to be adsorbed. |
