| 摘要 |
<p>A laser written, heat sensitive printing plate having an improved binder, and a method of preparation is disclosed. A transfer donor sheet having thereon, a layer or layers at least one of which comprises a vinyl polymeric binder having recurring units of the following formula: <CHEM> wherein: R<1> represents cyano, isocyanate, azide, sulfonyl, nitro, phosphoric, phosphonyl, heteroaryl, or <CHEM> where X is O, S, NR, or N<+)<R)2; R<3> is R, OR, O-M<+>, OCOOR, SR, NHCOR, NHCON(R)2, N(R)2 or N<+)<R)3; M<+> is an alkali or ammonium moiety; R is hydrogen, halogen, or an alkyl or cycloalkyl group; and R<2> is hydrogen, alkyl or from the same list as R<1>; and a laser light absorber, is placed in face-to-face contact with a receiver sheet having a support with a hydrophilic surface. The assemblage is imagewise exposed with a high intensity laser beam that transfers the binder to the receiver to produce a lithographic printing plate. A negative working plate is produced wherein exposed regions of the receiver accept conventional printing inks while the unexposed regions are hydrophilic. The transfer requires relatively low exposure and no post processing is necessary.</p> |
