申请人:American Hoechst Corporation
公开号:US04248959A1
公开(公告)日:1981-02-03
This invention relates to an improvement in a photochemical process for the preparation of printing plates wherein a printing plate comprising a photosensitive composition coated on a support is exposed to a pattern of laser light, the intensity of which light is modulated in accordance with an input source of information, and said printing plate is subsequently developed by removal from said support of that portion of the photosensitive coating composition which is not exposed to said pattern of laser light, the improvement comprising utilizing a pattern of laser light generated by a laser, and utilizing as a photosensitive composition a mixture consisting essentially of: (1) a negative-working condensate of a para-amino benzene diazonium compound present in an effective amount sufficient to sensitize said photosensitive composition to laser light, and (2) a colorant capable of absorbing light in the spectral range between about 450 -550 nm, said colorant selectively sensitizing the condensate to said laser light at a wavelength greater than about 450 nm, and being selected from the group consisting of azo, triarylmethane, xanthene and methine compounds.
本发明涉及一种用于制备印刷版的光化学过程的改进,其中包括在支撑物上涂覆光敏组分的印刷版,暴露于激光光的模式下,该光的强度根据输入信息的源进行调制,随后通过去除未暴露于激光光模式下的光敏涂层组分来开发该印刷版。该改进包括利用由激光产生的激光光模式,并利用作为光敏组分的混合物,其基本上由以下成分组成:(1)对氨基苯偶氮化合物的负作用缩合物,以足够的有效量存在于该光敏组分中,使其对激光光敏感,(2)一种色料,能够吸收在大约450-550纳米的波长范围内的光,该色料能够在大于约450纳米的波长下选择性地使缩合物对该激光光敏感,所述色料从偶氮,三芳基甲烷,三苯甲烷,黄原和甲烯化合物的组中选择。