Hydrophilic copolymers and their use in reprography

US5262244A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Raimund J. Faust · Wiesbaden, DE
• Silvia Lutz · Mainz, DE
• Engelbert Pliefke · Wiesbaden, DE

Key dates

• Filing date: Mar 1, 1993
• Grant date: Nov 16, 1993
• Expiry date: Mar 1, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31699
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to a hydrophilic copolymer having the general structure: EQU . . . --(A).sub.m -- . . . --(B).sub.n -- . . . --(C).sub.o -- . . . --(D).sub.p -- . . . in which PA0 A is at least one polymerizable monomer having an acidic side group, PA0 B is at least one polymerizable monomer having a basic side group, PA0 C is at least one polymerizable monomer having a non-polar, non-hydrophilic side group, and PA0 D is at least one polymerizable monomer capable of increasing the hydrophilic character of monomer A or to form a chelate with monomer A, PA0 m, n, o and p are the monomer contents of monomers A, B, C and D, respectively, in mol %, with m+n+o+p=100 mol %, with the proviso that m and n are each.gtoreq.2 mol % and p is .gtoreq.1 mol %, wherein the copolymer is a linear copolymer having a random structure of the monomers. The copolymer is useful as a hydrophilizing agent for lithographic and offset printing plates, and as a binder in light-sensitive lithographic layers.