Recording material having a pigment-coloured radiation-sensitive layer

US6667142B2 · kind B2 · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Michael Dorr · Cambridge, US
• Andreas Elsasser · Idstein, DE

Key dates

• Filing date: Oct 16, 2001
• Grant date: Dec 23, 2003
• Expiry date: Jan 9, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G03F7/105
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to a recording material having a substrate and a negative-working, radiation-sensitive layer which contains a diazonium salt, at least one film-forming, polymeric binder and organic colored pigments, on the surface of which an organic polymeric dispersant has been adsorbed and which are additionally dispersed in an organic polymeric binder which does not permanently combine with the pigments chemically or physically. The dispersant generally has groups, in particular primary, secondary or tertiary amino groups or derivatives thereof, which act as anchor groups on the colored pigment particles. The pigments themselves are preferably phthalocyanine pigments. As a result of the predispersing, aggregation of the pigment particles is effectively prevented so that uniform coloration of the radiation-sensitive layer is achieved. During development of the imagewise exposed recording materials, the colored pigment particles form virtually no insoluble precipitates. In the prepared printing plates, the printing parts are distinguished from the substrate material through being clearly visible and having high contrast.