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    • 7. 发明申请
    • RETARDATION FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY
    • 延迟膜,极化板和液晶显示器
    • US20150323703A1
    • 2015-11-12
    • US14649101
    • 2013-11-13
    • KONICA MINOLTA, INC.
    • Yuki KANEKOMasataka TAKIMOTOTakashi NANJIYOUTakahiro TAKAGIYuta SHIMANEMasumi NISHIMURA
    • G02B1/04G02B5/30C08J5/18G02F1/1335
    • G02B1/04C08K5/0008C08K5/0016C08K5/10C08K5/15C08K5/357C08K5/46C08L1/12C08L1/14C08L25/08C08L25/14C08L25/18C08L33/066C08L33/12G02B5/3083G02F1/133528G02F1/13363Y10T428/105
    • To provide a retardation film that, while maintaining a high retardation value, has increased durability such as moist heat resistance and can prevent the occurrence of color unevenness even if made in a size having a large area. The retardation film contains a cellulose ester as the primary component, has a film thickness of 15 μm or more and less than 40 μm, has a film thickness variation both in the widthwise direction and lengthwise direction of 0 to 4 μm, and satisfies an Rt humidity fluctuation represented by the formula (1) described below of 1% to 12%.Formula (1): Rt humidity fluctuation=(ΔRt value, a difference of retardation Rt(590) values in the thickness direction represented by the following formula (ii) measured at a wavelength of 590 nm after the film has been left to stand for 5 hours in each of a 23° C., 20% relative humidity environment and a 23° C., 80% relative humidity environment)/(Rt(590) value measured after the film has been left to stand for 5 hours in a 23° C., 55% relative humidity environment)×100.Formula (ii): Rt(590)={(nx+ny)/2−nz}×d(wherein nx represents a refractive index in the slow axis direction in the film plane, ny represents a refractive index in the direction perpendicular to the slow axis in the film plane, nz represents a refractive index in the thickness direction of the film, and d represents a film thickness (nm), respectively).
    • 为了提供在保持高延迟值的同时具有耐湿热性等耐久性的延迟膜,即使制成面积大的尺寸,也能够防止颜色不均匀的发生。 延迟膜含有纤维素酯作为主要成分,膜厚为15μm以上且小于40μm,宽度方向和长度方向的膜厚变化为0〜4μm,满足Rt 湿度波动由下述式(1)表示,为1%〜12%。 公式(1):Rt湿度波动=(&Dgr; Rt值,在膜被留下后在590nm波长下测量的由下式(ii)表示的厚度方向上的延迟Rt(590)值的差值 在23℃,20%相对湿度环境和23℃,80%相对湿度环境中的每一个中静置5小时)/(在静置5小时后测量的Rt(590)值 在23℃,55%相对湿度环境下)×100。 式(ii):Rt(590)= {(nx + ny)/ 2-nz}×d(其中,nx表示膜平面中的慢轴方向的折射率,ny表示与垂直于 膜平面中的慢轴,nz表示膜的厚度方向的折射率,d表示膜厚度(nm))。