Lithographic developer composition and method of use

US9588429B1 · kind B1 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Jianbing Huang · Trumbull, US
• Gerhard Hauck · Badenhausen, DE
• Celin Savariar-Hauck · Badenhausen, DE
• Andrea Pauls · Osterode, DE
• Dietmar Frank · Northeim, DE
• Oliver Piestert · Goslar, DE

Key dates

• Filing date: Sep 3, 2015
• Grant date: Mar 7, 2017
• Expiry date: Sep 3, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G03F7/40
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Lithographic printing plates are formed by imagewise exposing a single-layer or dual-layer positive-working lithographic printing plate precursor. The precursor has an outermost ink receptive layer containing a phenolic resin. The exposed precursor can be processed using a silicate-free developer composition having a pH of at least 12.5. This composition also includes an alkali metal hydroxide; a coating protecting agent that is a quaternary ammonium salt or phosphonium salt, or a mixture thereof, and a moderator for the coating protecting agent that is represented by the following general formula (I):wherein m is at an integer of at least 1 and up to and including 10 and M represents one or more counterions sufficient to balance the negatively-charged sulfonate groups.