| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a negative photosensitive planographic printing plate having high sensitivity to near IR rays at 700 nm or more, excellent elution property and plate wear, and excellent storage property with little decrease in the elution property with time or little change in the sensitivity. <P>SOLUTION: The planographic printing plate has a photopolymerizable photosensitive layer containing a sensitized dye which imparts sensitivity in a wavelength region from 700 nm to 900 nm and an organic boron compound as a radical generating agent, wherein the photosensitive layer contains a thiourea compound expressed by general formula (I). In formula (I), each of R<SB>1</SB>to R<SB>4</SB>represents a hydrogen atom or an unsubstituted alkyl group, wherein R<SB>1</SB>to R<SB>4</SB>may be identical or different from one another and R<SB>2</SB>and R<SB>4</SB>may form a five-member or six-member ring. <P>COPYRIGHT: (C)2008,JPO&INPIT |
