SULFOACIDS OF SUBSTITUTED N,N′-DIPHENYLDIIMIDES AND DIBENZIMIDAZOLES OF 3,4,9,10-ANTANTRONTETRACARBOXYLIC ACID AS MATERIALS FOR FORMING SUPERTHIN LIGHT- AND THERMOSTABLE GRAY COLOR POLARIZING COATINGS Russian patent published in 1995 - IPC

FIELD: organic chemistry. SUBSTANCE: new compounds sulfoacids of substituted N,N′-diphenyldiimides or dibenzimidazoles of 3,4,9,10-antantrontetracarboxylic acid were synthesized by sulfonation of corresponding derivatives of 3,4,9,10-antantrontetracarboxylic acid or 1,1′- binaphthyl-4,4′,5,5′,8,8′ -hexacarboxylic acid at 80-130 C. Synthesized water-soluble dyes show capability to form lyotropic mesomorphic phase that allows to form superthin thermostable polarizing gray color coatings with high light stability (up to 7-8 points). EFFECT: enhanced quality of material. 1 tbl