Patent ID: 6319290
Filing Date: 2001-11-20
Classification: C09B,Y10S

Abstract:
Compounds of the general formula (I) ##STR28##wherein R.sub.1 represents hydrogen or a C.sub.1-4 -alkyl group;X represents:(a) the radical of a cyclic diamine other than an aromatic diamine, which can optionally be substituted;(b) the radical of an aromatic diamine, wherein said radical is a member selected from the group consisting of ##STR29##wherein R.sub.2 is a member selected from the group consisting of --H, and--OH, provided that when R.sub.2 is H, R.sub.1 is H; and ##STR30##wherein R.sub.3 is --OH;or(c) the radical of an aliphatic group, said radical represented by the formula ##STR31##andY represents hydrogen or an alkali metal, and mixtures of such compounds.