FIELD: physics.
SUBSTANCE: invention relates to a polymer which absorbs in the near infrared region, containing at least two different side infrared chromophoric groups which are covalently bonded to the main polymer chain which is soluble in resin bases, at least one of which is an indole cyanine dye and the other benz[e]indole cyanine dye. When using pre-printing coating of a photosensitive positive offset plate, stabilisation time required after production is considerably shorter and the additional process of conditioning before use is avoided. Pre-printing plates are preferably plates exposed to the image by a laser which emits in the near infrared region at wavelength between 780 nm and 850 nm.
EFFECT: improvement of operational characteristics.
11 cl, 2 tbl, 6 ex
