Thermal waterless lithographic printing plate
    373.
    发明授权
    Thermal waterless lithographic printing plate 失效
    无水平版印刷版

    公开(公告)号:US5919600A

    公开(公告)日:1999-07-06

    申请号:US128887

    申请日:1998-08-04

    Abstract: A waterless or driographic printing plate which can be thermally imaged by an infrared laser is composed of a substrate; a thermal imaging layer containing a photothermal conversion material, such as an infrared absorbing material, and a thermoplastic polyurethane with pendent allyl groups; and a crosslinked silicone polymer top layer. It was discovered that when the imaging layer contains an allyl functional polyurethane mixed with an infrared absorbing dye or pigment, the polymeric layer will have enhanced solubility in certain solvents when exposed to infrared radiation. In addition, the polymeric layer continues to exhibit excellent adhesion to the silicone in unexposed areas so that the infrared absorbing layer can endure development with a suitable organic solvent, or a solvent mixture. Mild brushing or rubbing with the developing solvent readily removes laser-struck portions of the infrared imaging layer while unexposed areas remain firmly intact.

    Abstract translation: 可通过红外激光热成像的无水或流体印刷版由基板构成; 包含光热转换材料如红外吸收材料的热成像层和具有侧链烯丙基的热塑性聚氨酯; 和交联的硅氧烷聚合物顶层。 已经发现,当成像层含有与红外吸收染料或颜料混合的烯丙基官能聚氨酯时,当暴露于红外辐射时,聚合物层将在某些溶剂中具有增强的溶解度。 此外,聚合物层在未曝光区域中继续表现出对硅酮的优异粘合性,使得红外线吸收层可以用合适的有机溶剂或溶剂混合物持续显影。 用显影溶剂进行轻度刷涂或摩擦可以很容易地去除红外成像层的激光打击部分,而未曝光的区域保持牢固地完整。

    Lithographic element comprising support and hydrophilic layer
    375.
    发明授权
    Lithographic element comprising support and hydrophilic layer 失效
    包含支撑层和亲水层的平版印刷元件

    公开(公告)号:US5665521A

    公开(公告)日:1997-09-09

    申请号:US591409

    申请日:1996-01-25

    Inventor: Yoshihiro Takagi

    Abstract: A lithographic element comprises a support and a hydrophilic layer. The hydrophilic layer contains fine particles of silicon dioxide dispersed in gelatin. The particles have an average particle size in the range of 0.1 to 10 .mu.m. The particles are contained in the layer in an amount of not more than 2 g per m.sup.2. The gelatin has an average molecular weight in the range of 10,000 to 300,000.

    Abstract translation: 光刻元件包括支撑体和亲水层。 亲水层包含分散在明胶中的二氧化硅细颗粒。 颗粒的平均粒径在0.1〜10μm的范围内。 颗粒以不超过2g / m2的量包含在层中。 明胶的平均分子量为10,000〜300,000。

    Offset printing plates
    380.
    发明授权
    Offset printing plates 失效
    偏移打印板

    公开(公告)号:US3474719A

    公开(公告)日:1969-10-28

    申请号:US3474719D

    申请日:1966-07-05

    Applicant: GAF CORP

    Inventor: LEVINOS STEVEN

    Abstract: 1,177,527. Photo-sensitive materials. GAF CORP. April 14, 1967 [April 15, 1966; July 5, 1966], No. 17346/67. Heading G3C. A photo-sensitive material comprises a metal support coated with an alkali-soluble intermediate layer consisting of a copolymer with 80-99% mole per cent of acrylate units and 1-20% of acrylic acid units, and with a layer containing a quinone diazide and a water-insoluble, alkali-resistant polymer. Specified polymers are polyvinyl acetate, polymethyl acrylate or methacrylate, cellulose ethers and esters and phenolmodified coumarone-indene resins. The support may be aluminium, copper, coated aluminium or chromium copper-aluminium. The material is imagewise exposed and developed with a polyhydric alcohol to remove the un-exposed areas to produce a negative printing plate; the copolymer layer being hydrophilic. If the developer contains an amine, the copolymer and light-sensitive layers are removed in the exposed areas and the bared metal surface etched to produce either a positive or a negative printing plate.

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