Silane diimidic tetracarboxylic perylene dyes and composite pigments

Abstract From the Canadian patent

Silane diimidic tetracarboxylic perylene dyes the com-, posite pigments obtainable there-from by means of grafting onto an inorganic substrate, and the processes for preparing same. The dyes have the general formula:, (I), in which R is the residue of a silane group of formula: (II), wherein n is 3, 4 or 5; q is 0 or 1; p is 2 or 3 and m is 0 1, 2, or 3 with the proviso that when q is 0 p is 3 and m is 0, 1 2 or, 3 and when q is 1 p is 2 and m is 0, 1 or 2; R2 is an alkyl C1- C4 or a phenyl; R3 is an alkoxyl C1-C2; R1 may be the same as R or represent an alkyl C1-C6, a cyclohexyl a phenyl which may be, substituted by one or more alkyl or alkoxyl groups C1-C6 or a halogen. The dyes and the …