Radiation imagery chemistry: process – composition – or product th – Imaged product – Nonsilver image
Reexamination Certificate
2005-08-30
2005-08-30
Schilling, Richard L. (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Imaged product
Nonsilver image
C430S273100, C430S286100, C430S302000, C430S944000, C430S916000, C430S926000, C430S281100, C522S025000, C522S029000
Reexamination Certificate
active
06936384
ABSTRACT:
The present invention provides an initiator system including an infrared-absorbing compound that exhibits an electronic transition band in the near-infrared region, an initiator, and a metallocene compound. Upon exposure to infrared radiation, the initiator system is capable of producing radicals sufficient to initiate a photopolymerization reaction. Suitable infrared-absorbing compounds include indocyanine dyes, for example. Trihalomethyl triazine compounds and onium compounds are suitable initiators. Suitable metallocene compounds include ferrocenes and titanocenes. The present invention also provides an infrared-sensitive composition including an ethylenically unsaturated polymerizable component, an infrared-absorbing compound that exhibits an electronic transition band in the near-infrared region, an initiator, and a metallocene compound. The infrared-sensitive composition provides improved photospeed and sensitivity in some embodiments. A printing plate precursor including an infrared-sensitive coating is also provided. The printing plate precursor exhibits enhanced shelf life in some embodiments. A method of making a printing plate precursor and a method for making a printable lithographic printing plate are further provided by the invention.
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Huang Jianbing
Munnelly Heidi M.
Faegre & Benson LLP
Kodak Polychrome Graphics LLC
Schilling Richard L.
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