PURPOSE: To facilitate the formation of a printing plate material suitable for relief printing or the like, by applying light of a specified wavelength through a pattern mask against a polymeric material capable of undergoing phot-Fries rearrangement and thereby introducing thereto hydroxyl or amino groups after the pattern.
CONSTITUTION: A polymeric material is prepared from a polymerix compound having an aryl ester, aryl amide, or aryl carbonate unit in the main chain or a side chain and being capable of undergoing photo-Fries rearrangement (e.g., polyphenyl methacrylate or poly-N-acetylaminostyrene). Near-ultraviolet to far-ultraviolet light of a wavelength of 210W390nm is applied through a pattern mask against the polymeric material to effect Fries rearrangement after the pattern to introduce hydroxyl or amino groups to render the material hydrophilic after the pattern. A negative or positive pattern can be obtained by developing the material.
KOSHIBA MITSUNOBU
YOKOYAMA YASUAKI
HARITA YOSHIYUKI
