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# c12) United States Patent 

# Levanon et al. 

# (54) PROCESSING OF POSITIVE-WORKING LITHOGRAPHIC PRINTING PLATE PRECURSOR 

(75) Inventors: Moshe Levanon, Ness-Ziona (IL); Moshe Nakash, Ramat Hashron (IL); Tanya Kurtser, Petach Tikva (IL) 

(73) Assignee: Eastman Kodak Company, Rochester, NY(US) 

( *) Notice: Subject to any disclaimer, the term ofthis patent is extended or adjusted under 35 U.S.C. 154(b) by 951 days. 

(21) Appl. No.: 12/195,468 

Aug. 21, 2008 (22) Filed: 

## (65) Prior Publication Data 

US 2010/0047723 Al Feb. 25, 2010 

(51) Int. Cl. G03F 7130 (2006.01) B41N 1/10 (2006.01) 

(52) U.S. Cl. ...................... 430/302; 430/326; 101/463.1 

(58) Field of Classification Search ........................ None See application file for complete search history. 

## (56) References Cited 

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<img src='content_image/942808.jpg'>

## U.S. PATENT DOCUMENTS 

## FOREIGN PATENT DOCUMENTS 

<img src='content_image/942823.jpg'>

# (IO) Patent No.: US 8,187,792 B2 

# May 29, 2012 (45) Date of Patent: 

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English translation ofJP 2006-018203, A (2006) from machine trans› lation from AIPN Japan Patent Office National Center for Industrial Property Information and Training, generated Jun. 22, 2011, 63 + 12 pages.* 

U.S. Appl. No. 11/677,599, filed Feb. 22, 2007, titled Radiation› Sensitive Compositions and Elements With Basic Development Enhancers, by M. Levanon et al. 

U.S. Appl. No. 11/769,766, filed Jun. 28, 2007, titled Radiation› Sensitive Compositions and Elements With Solvent Resistant Poly(Vinyl Acetal)s, by M. Levanon et al. 

U.S. Appl. No. 11/959,492, filed Dec. 19, 2007, titled Radiation› Sensitive Elements With Developability-Enhancing Compounds, by M. Levanon et al. 

U.S. Appl. No. 12/025,089, filed Feb. 4, 2008, titled Method of Imaging and Developing Positive-Working Imageable Elements, by M. Levanon et al. 

U.S. Appl. No. 12/125,084, filed May 22, 2008, titled Method of Imaging and Developing Positive-Working Imageable Elements, by M. Levanon et al. 

* cited by examiner 

Primary Examiner - Cynthia Hamilton 

(74) Attorney, Agent, or Firm - J. Lanny Tucker 

## (57) ABSTRACT 

Positive-working imageable elements can be imaged and pro› cessed using a processing solution that comprises at least 0.03 N of an organic amine or a mixture thereof, whose conjugated acids have a pKa greater than 9 and a boiling point greater than 150° C. The imageable element is a single-layer, infrared radiation-sensitive positive-working imageable element comprising a substrate and an infrared radiation absorbing compound. It also has an imageable layer that comprises a developability-enhancing compound and a poly(vinyl acetal) in which at least 25 mo! % of its recurring units comprise pendant phenol, naphtha!, or anthracenol groups that are sub› stituted with one or more electron-withdrawing groups. 

US008187792B2 

## OTHER PUBLICATIONS 

## 19 Claims, No Drawings 

