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    5.
    发明专利
    未知

    公开(公告)号：DE69817345T2

    公开(公告)日：2004-06-09

    申请号：DE69817345

    申请日：1998-05-15

    Applicant: KODAK POLYCHROME GRAPHICS LLC

    Inventor： ZHONG XING-FU ,  SHIMAZU KEN-ICHI ,  PAPPAS PETER ,  HARMS H ,  DO THI ,  SARAIYA SHASHIKANT ,  KEAVENEY P

    IPC: B41C1/10 ,  G03F1/00

    Abstract: Presensitized lithographic plates are prepared which permit direct formation of printable images on plates by digital computerization without the intervening formation of a photographic image with a quality that allows the plates to be used for high volume printing applications. The lithographic printing plate has a structure which contains a substrate; a positive or negative working photosensitive layer; and a thermally sensitive masking layer which is opaque to the actinic radiation but which is soluble in an aqueous medium. The masking layer contains a heat softenable disperse phase which is insoluble in the aqueous medium; a polymeric continuous phase which is soluble or swellable in the aqueous medium; and a colorant which strongly absorbs radiant energy and converts the radiant energy to heat. In use the masking layer is digitally exposed to a computer controlled laser image so that exposed image areas of the masking are insolublized in the aqueous medium; soluble areas of the mask layer are then removed to form an opaque image mask on the photosensitive layer which is then exposed to actinic radiation passing through the mask to solubilize or insolubilize exposed areas of the photosensitive layer; the photosensitive layer is then developed with the developer liquid to remove the soluble areas and any overlying mask areas to form the lithographic printing plate. Both wet and waterless lithographic printing plates may be digitally prepared in this manner.

    6.
    发明专利
    未知

    公开(公告)号：DE69817345D1

    公开(公告)日：2003-09-25

    申请号：DE69817345

    申请日：1998-05-15

    Applicant: KODAK POLYCHROME GRAPHICS LLC

    Inventor： ZHONG XING-FU ,  SHIMAZU KEN-ICHI ,  PAPPAS PETER ,  HARMS H ,  DO THI ,  SARAIYA SHASHIKANT ,  KEAVENEY P

    IPC: B41C1/10 ,  G03F1/00

    Abstract: Presensitized lithographic plates are prepared which permit direct formation of printable images on plates by digital computerization without the intervening formation of a photographic image with a quality that allows the plates to be used for high volume printing applications. The lithographic printing plate has a structure which contains a substrate; a positive or negative working photosensitive layer; and a thermally sensitive masking layer which is opaque to the actinic radiation but which is soluble in an aqueous medium. The masking layer contains a heat softenable disperse phase which is insoluble in the aqueous medium; a polymeric continuous phase which is soluble or swellable in the aqueous medium; and a colorant which strongly absorbs radiant energy and converts the radiant energy to heat. In use the masking layer is digitally exposed to a computer controlled laser image so that exposed image areas of the masking are insolublized in the aqueous medium; soluble areas of the mask layer are then removed to form an opaque image mask on the photosensitive layer which is then exposed to actinic radiation passing through the mask to solubilize or insolubilize exposed areas of the photosensitive layer; the photosensitive layer is then developed with the developer liquid to remove the soluble areas and any overlying mask areas to form the lithographic printing plate. Both wet and waterless lithographic printing plates may be digitally prepared in this manner.

    10.
    发明专利
    未知

    公开(公告)号：DE69804109D1

    公开(公告)日：2002-04-11

    申请号：DE69804109

    申请日：1998-08-31

    Applicant: KODAK POLYCHROME GRAPHICS LLC

    Inventor： HUANG JIANBING ,  PAPPAS PETER ,  DO NGUYEN ,  GOODMAN M ,  SARAIYA SHASHIKANT

    IPC: G03F7/00 ,  B41C1/10 ,  B41N1/00 ,  B41N1/14 ,  G03F7/32

    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.

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