Negative-working imageable elements
AssigneeEastman Kodak Company
InventorsChristopher D. Simpson, Ursula Müller, Harald Baumann, Udo Dwars
Life of this patent
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Abstract
Negative-working imageable elements can be imaged and processed to provide lithographic printing plates. These imageable elements are sensitive to infrared radiation but are insensitive to “white” light and thus can be more easily handled under white light conditions. These properties are possible by incorporating a filter dye having a λmax of from about 300 to about 500 nm into the imageable layer of the imageable elements.
Claims21
A negative-working imageable element comprising a substrate and having thereon an imageable layer that is sensitive to imaging radiation of from about 750 to about 1400 nm, the imageable layer comprising:
- (1) an infrared radiation absorbing compound having a λmax of from about 750 to about 1400 nm,
- (2) a polymeric binder,
- (3) a free radical polymerizable compound,
- (4) a composition that provides free radicals in response to exposure to infrared radiation, and
- (5) a filter dye having a λmax of from about 300 to about 500 nm and that is present only in the imageable layer in an amount so that the white light stability of the imageable element satisfies the following inequality:
- WLS>3(WLS0)
- wherein WLS represents the white light stability of the imageable element containing the filter dye, and WLS0 represents the white light stability of an imageable element that is different only in that the filter dye has been omitted.
Dependencies are inferred from the claim text.