Lithographic printing starting plate

Details Lithographic printing starting plate Lithographic printing starting plate

2007-07-17

2007-07-17

Gilliam, Barbara L. (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

C430S271100, C430S278100, C430S302000, C430S309000, C430S434000, C430S435000, C430S494000, C430S944000, C430S945000

Reexamination Certificate

active

10945971

ABSTRACT:
A positive-working lithographic printing starting plate for an infrared laser is provided that includes a support having a hydrophilic surface and a heat-sensitive layer provided above the support. The heat-sensitive layer includes a water-insoluble and alkali-soluble resin, an infrared-absorbing dye, and a sulfonium salt represented by Formula below. The heat-sensitive layer increases its solubility in aqueous alkaline solution upon exposure to an infrared laser.(In the formula, R1and R2independently denote an optionally substituted alkyl group having 1 to 12 carbons, an optionally substituted cycloalkyl group having 3 to 8 carbons, an optionally substituted aralkyl group having 7 to 12 carbons, or an optionally substituted aryl group having 6 to 15 carbons, R1and R2may bond to each other to form a cyclic structure; Ar denotes an optionally substituted aromatic hydrocarbon group having 6 to 15 carbons and having at least one OH group at the ortho- and/or para-position; and X−denotes an anion of an organic acid.)

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