Patent ID: 6130029
Filing Date: 2000-10-10
Classification: G03C

Abstract:
A stabilized, substantially anhydrous composition comprising an N,N-dialkyl-p-phenylenediamine color developer selected from salts of N,N-diethyl-4-amino-3-methylaniline, N-(2-methanesulfonamidoethyl)-N-ethyl-4-amino-3-methylaniline and N-ethyl-N-(2-hydroxyethyl)-4-amino-3-methylaniline which is subject to oxidative discoloration in a finely divided form and about 0.05 to 1.0 weight percent of an alkali metal metabisulfite, bisulfite or sulfite, based on the total weight of the color developer and the alkali metal metabisulfite, bisulfite or sulfite.