Laminates for the manufacture of relief printing plates

US3990897A · kind A · utility

Assignee

• BASF SE

Inventors

• Manfred Zuerger
• Albert Elzer · Otterstadt, DE
• Peter Richter · Karlstein, DE
• August Wigger · Waldsee, DE
• Heinz-Ulrich Werther · Monsheim, DE

Key dates

• Filing date: Oct 22, 1974
• Grant date: Nov 9, 1976
• Expiry date: Oct 22, 1994

Classification

• Technology area (CPC G): Physics
• CPC primary: G03F7/11
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to relief plates for flexographic printing comprising a relatively soft elastomeric base (U) having a modulus of elasticity of from 10 to 200 kg/cm.sup.2 and a thickness of from 0.5 to 6 mm and, firmly bonded thereto, a thin, relatively hard, difficultly soluble intermediate layer Z having a modulus of elasticity of from 1 .times. 10.sup.3 to 2.1 .times. 10.sup.6 kg/cm.sup.2 and a thickness of from 5 to 500 .mu. and, firmly bonded to said intermediate layer Z, a relief layer P' consisting of a photocrosslinked elastomeric mixture having a modulus of elasticity of from 30 to 2000 kg/cm.sup.2 and a thickness of from 200 to 300 .mu., the modulus of elasticity of the photocrosslinked relief layer P' being the same as or higher than that of the base U and the neutral surface of the relief plate lying in or near the intermediate layer Z. The invention also relates to photosensitive laminates for the production of such plates.