“ PROCESS FOR PREPARING P-PHENYLENEDIAMINE COLOR DEVELOPERS IN A CONCENTRATED FREE-BASE FORM“
Application 355/DELNP/2004 published 2006-03-10, filed 2004-02-17
An improved method for making a p-phenylenediamine color developeer concentrate in a free-base form wherein the sulfate or chloride salt of the color developer is contacted with an alkali metal hydroxide includes the steps of forming a liquid free-base layer and a water layer, separating the liquid free-base layer from the water layer; and mixing the liquid free-base with a water soluble hydroxy organic solvent, wherein the p-phenylenediamine color developer concentrate has at least 0.06 mol/l of a color developing agent in the free base form.
Applicant
EASTMAN CHEMICAL COMPANY
100 North Eastman Road, Kingsport, Tennessee 37660, USA
Inventor
1. RENEE ELLEN NIZIURSKI-MANN 2. LUCIAN BOLDEA 3. PHILIPP MONTGOMERY HUDNALL 4. MICHAEL WAYNE SALYER
International Info
Classification: G03C 7/413
Publication Number: WO 03/034147
Application Date: 2002-09-13
Priority Information
09/976,783 U.S.A. 2001-10-13