Heat mode sensitive imaging element for making positive working printing plates

US6342336B2 · kind B2 · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Eric Verschueren · Merksplas, BE
• Marc Van Damme · Heverlee, BE
• Joan Vermeersch · Deinze, BE
• Guido Hauquier · Nijlen, BE
• Jorg Jung · Flörsheim, DE
• Helmuth Haberhauer · Taunusstein, DE

Key dates

• Filing date: Mar 5, 1999
• Grant date: Jan 29, 2002
• Expiry date: Mar 5, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41C2210/266
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

According to the present invention there is provided a heat mode imaging element for making a lithographic printing plate having on a lithographic base with a hydrophilic surface a first layer including a polymer, soluble in an aqueous alkaline solution but not in water and less than 5% by weight versus the polymer, soluble in the aqueous alkaline solution of a hydrophilic polymer and a top layer on the same side of the lithographic base as the first layer which top layer is IR-sensitive and unpenetrable for or insoluble in an alkaline developer wherein said first layer and said top layer may be one and the same layer; characterized in that said top layer contains a compound selected from the group consisting of a polymer in an amount from 30 mg to 500 mg/m2, a triaryl methane dye and a phthalocyanine dye.