Gumming solution for use in the burning-in of offset-printing plates comprising water, a hydrophilic polymer and an organic acid derivative

US4786581A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Paul Stahlhofen · Wiesbaden, DE
• Loni Schell · Hofheim, DE

Key dates

• Filing date: Feb 9, 1987
• Grant date: Nov 22, 1988
• Expiry date: Feb 9, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G03F7/40
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A gumming solution is disclosed for use in the burning-in of irradiated and developed offset-printing plates. The gumming solution contains (a) water, (b) at least one hydrophilic polymer, and (c) at least one component derived from an organic acid. Component (b) comprises, for example, N-polyvinyl-pyrrolidone-(2) or polyacrylic acid, and component (c) comprises a water-soluble organic carboxylic acid, sulfonic acid, or phosphonic acid which has at least two acid functions and which is selected from the group consisting of benzene carboxylic acids, benzene sulfonic acids, benzene phosphonic acids, and alkane phosphonic acids, or one of the salts thereof (for example, disodium-benzene-1,3-disulfonate, mellitic acid, or methane-diphosphonic acid.) A process for the production of an offset-printing plate, using the aforesaid gumming solution in the burning-in of the plate, is also disclosed. With application of this gumming solution, washing of the printing plate prior to printing is rendered unnecessary, since the printing plate runs clean very rapidly during the printing process.