PURPOSE: To obtain an economically advantageous color polarizing film requiring no laminating and having a freely selected hue, superior polarizing performance, superior heat and moisture resistances, by stretching a hydrophobic polymer film in 2 steps.
CONSTITUTION: A hydrophobic polymer film is made dyeable by primary stretching and dyed with substantive color, disperse dye, acid dye or other dichromatic dye. In order to increase the degree of polarization by the orientation of the dye, secondary stretching is carried out in one direction or two directions perpendicular to each other. At this time, it is required that the stretching rate of the finally stretched film in one direction is made at least 1.1 times that of the film in the direction perpendicular to said direction.
HOSONUMA MAKOTO
YAMADA YASUYUKI
NISHIZAWA ISAO
| JPS547947A | 1979-01-20 | |||
| JPS5445153A | 1979-04-10 |