The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 1994
Filed:
Dec. 24, 1992
Tsutami Misawa, Yokohama, JP;
Akira Ogiso, Yokohama, JP;
Rihoko Imai, Tokyo, JP;
Hisato Itoh, Yokohama, JP;
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JP;
Abstract
Dyes having the specific structural formula (1) set out below, their copper salt dyes, water-soluble azo dyes containing the dyes or the copper salt dyes, and polarizing films containing the water-soluble azo dyes: ##STR1## wherein A means a benzene or naphthalene ring having a sulfone group or a base thereof, Y and Z individually denote a group of the following formula (a): ##STR2## wherein R.sup.2 is a hydrogen atom, a methyl group, a methoxyl group or an ethoxyl group and R.sup.3 is a methyl, methoxyl or ethoxyl group, R.sup.1 represents an amino, C.sub.1-4 alkylamino, C.sub.2-4 alkylcarboxyamino, benzoylamino or phenylamino group bonded to the 6 or 7 position of the naphthalene ring, and X denotes a hydrogen, sodium, potassium or lithium atom, with the proviso that Y and Z are different but, when both R.sup.2 s are hydrogen atoms and both R.sup.3 s are methoxyl groups, Y and Z may be the same.