CHARLES H LEBLANC
Optometry in Kingsport, TN
License number
Massachusetts 486
Type
Dispensing Optician
Address
Address
Kingsport, TN 37664
Professional information
Stabilized Phenylenediamine Color Developer Compositions
US Patent:
6130029, Oct 10, 2000
Filed:
Jun 14, 1999
Appl. No.:
9/332648
Inventors:
Charles Hubert LeBlanc - Kingsport TN
Assignee:
Eastman Chemical Company - Kingsport TN
International Classification:
G03C 7413
US Classification:
430467
Abstract:
Disclosed is a method for the stabilization of dry N,N-dialkyl-p-phenylenediamine color developers and to the stabilized compositions thus obtained wherein the color developer which is susceptible to oxidative discoloration is intimately mixed with a stabilizing amount of an alkali metal metabisulfite, bisulfite or sulfite The method is particularly useful for the stabilization of salts of N-ethyl-N-(2-hydroxyethyl)4-amino-3-methylaniline.