Patent ID: 6177182
Filing Date: 2001-01-23
Classification: B41C,B41M,C08F,H05K,Y10S,Y10T

Abstract:
A lithographic printing plate consisting of a substrate plate comprising a coating of a near infrared absorption polymer comprising the following repeating units: ##STR19##whereinE represents the near infrared absorption segment, which exhibits strong absorption bands between 780 and 1200 nm;F represents the processing segment, which provides excellent film forming properties and solubility in aqueous solutions having pH between 2.0 and 14.0;G represents the thermally reactive segment, which undergoes localized chemical or physical reactions, with or without catalysts, upon localized exposure to near infrared laser light so that said polymer becomes locally:(i) insoluble in aqueous solutions if said polymer was soluble in aqueous solutions prior to exposure to near infrared light, or(ii) soluble in aqueous solutions if said polymer was insoluble in aqueous solutions prior to exposure to near infrared light;a, b and c represent the molar ratios, which vary from 0.01 to 1.00; and wherein said polymer has a molecular weight greater than about 5,000.