Sumitomo Chemical Company, Limited

Yoshiteru Ohta

Narutoshi Hayashi

Toru Ashida

Takashi Omura

Naoki Harada

Kingo Akahori

Masumi Suetsugu

Nobutaka Kunimi

Kouji Toishi

Mahito Fujita

Sang-tae Kim

The present invention provides a disazo compound of the formula (I) or a salt thereof wherein A represents 4-sulfophenyl or 6,8-disulfo-2-naphtyl, one of Rand Rrepresents hydrogen or methyl. The present invention also provides a dye-based polarizing film comprising a base material and the disazo compound of the formula (I) or the salt thereof contained in the base material. The disazo compound of the present invention provides a polarizing film, which is excellent in light resistance and initial polarizing performance, particularly light resistance when used as a polarizing element.

Disazo compound or salt thereof and polarizing film using the same

Polyazo compound or salt thereof and dye-based polarization film containing the same

A polymer having an O-substituted vinylphenol unit represented by the following formula (I)

Polymers having O-substituted vinylphenol unit and resist compositions containing them

A polyazo compound represented by the following formula (I): ##STR1## wherein A represents unsubstituted phenylene or naphthylene;

Polyazo compound and method for dyeing or textileprinting fiber material

There is provided a bisazo compound which is useful as a reactive dye for dyeing or printing a fiber material in an orange to scarlet or red color; the bisazo compound being represented by the following formula (1): ##STR1## wherein m and n represents 0 or 1; W represents a divalent connecting group represented by --NH-- or --NHCONH--;

Fiber-reactive bisazo compound

A bisazo compound represented by the formula (I) in the free acid form, ##STR1## wherein D is unsubstituted or substituted phenyl or naphthyl; A and B are independently unsubstituted or substituted phenylene or naphthylene; R is hydrogen or unsubstituted or substituted lower alkyl; X is aromatic amino residue or aliphatic amino residue; arid Y is a group represented by the formula, ##STR2## wherein R.sup.1 is hydrogen or unsubstituted or substituted alkyl, W.sub.0 is unsubstituted or substituted alkylene; and Z is vinyl or --CH.sub.2 CH.sub.2 Z.sub.1, in which Z.sub.1 is a group capable of being split by the action of an alkali; is a reactive dye useful for dyeing or printing fiber materials having hydroxy groups and/or amide groups to brown or violet color, and can provide dyed or printed products with superior fastness properties and dyeing properties such as build-up property.

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Nara, Japan

Yoshiteru Ohta