Diketopyrrolopyrrole pigments in platelet form

USRE35009E · kind E · reissue

Assignee

• Ciba-Geigy · US

Inventors

• Philippe Bugnon · Le Mouret, CH
• Fritz Herren · Fribourg, CH
• Bernhard Medinger · Giffers, CH

Key dates

• Filing date: Oct 28, 1993
• Grant date: Aug 1, 1995
• Expiry date: Oct 28, 2013

Classification

• Technology area (CPC —): General

Abstract

Organic pigments selected from the diketopyrrolopyrrole, azo, isoindolinone and isoindoline series, which pigments consist of .Iadd.at least .Iaddend.50% by weight of platelets which are from 5 to 50 .mu.m long, 2 to 50 .mu.m wide and 0.01 to 5 .mu.m thick, with the proviso that the ratios of length:thickness and width:thickness must be at least 3. The pigments in platelet form are excellently suited to producing effect colorations in high molecular weight organic material and in cosmetic products.