Nippon Kayaku Kabushiki Kaisha

Polatechno Co., Ltd.

Junji Toda

Kouichi Tanaka

Kunihiro Ichimura

Eiichi Ogawa

Hideyoshi Fujisawa

Kenichiro Yoshioka

Norio Ishizuki

A phase difference film which comprises a liquid crystal film having a liquid crystal comprised of a cellulose derivative as a liquid crystal compound (cellulose derivative liquid crystal) being oriented in a specific direction, preferably said phase difference film wherein said orientation in a specific direction is fixed. In said liquid crystal film, through changing appropriately the molecular weight of the cellulose derivative, the composition of the liquid crystal, the degree of the orientation, and the like, films having various wave length dispersion characteristics can be prepared with ease, and further a phase difference film satisfying the following relationship: &#x394;n450=&#x394;n550=&#x394;n650 (1) wherein &#x394;n550 represents a double refractive index at a wave length of 550 nm, &#x394;n450 represents a double refractive index at a wave length of 450 nm, and &#x394;n650 represents a double refractive index at a wave length of 650 nm, can be prepared without laminating a plurality of phase difference films. Said phase difference film, used in combination with a polarizing film, exhibits excellent reflection preventing effect, contrast improving effect, double refraction compensating effect, and the like.

Liquid crystalline compound and reterdation difference film using the same

Polarizing element, polarizing plate, and process for production thereof

A chromium complex compound represented as the free acid form by the formula (I): ##STR1## wherein X.sup.1 represents a hydrogen atom, a methyl group, a methoxy group or a sulfonic acid group; X.sup.2, X.sup.3 and X.sup.4 represent independently a hydrogen atom, a chlorine atom, a methyl gorup, a methoxy group, a carboxyl group or a sulfonic acid group; Y represents a hydrogen atom or a sulfonic acid group; Z represents a chlorine atom, a fluorine atom or --N.sup.30 (R).sub.3 (R represents a C.sub.1 to C.sub.4 -alkyl group), ##STR2## and M represents a hydrogen atom or an alkali metal, a process for producing the chromium complex compound (I) and a method for dyeing cellulosic fibers with the same. The chromium complex compound represented by formula (I) is excellent in affinity to cellulosic fibers and in color-yield, build-up properties and fastness properties. These compounds are dyes for cellulosic fibers.

Chromium complex compound

Growing community of inventors

Saitama, Japan

Junji Toda