Method of providing an image using a negative-working infrared photosensitive element
AssigneeEastman Kodak Company
InventorsPaul Richard West, Eugene Lynn Sheriff, Jeffery Allen Gurney, Ralph Scott Schneebeli, Thomas Robert Jordan, Gary Roger Miller
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Abstract
An infrared imaging composition contains two essential components, namely an infrared radiation absorbing compound, and a phenolic resin that is either mixed or reacted with an o-diazonaphthoquinone derivative. These compositions are useful in photosensitive elements such as lithographic printing plates that can be used to provide images using laser imaging, followed by uniform exposure and development.
Claims14
A method for imaging a photosensitive element comprising the steps of, in order:
- A) providing a negative-working photosensitive element consisting essentially of a support having thereon a negative-working photosensitive composition consisting essentially of:
- a)
- (i) a mixture of a phenolic resin and an o-diazonaphthoquinone derivative,
- (ii) a reaction product of a phenolic resin and an o-diazonaphthoquinone reactive derivative, or
- (iii) a mixture of (i) and (ii), and
- b) a compound that absorbs infrared radiation having a maximum wavelength greater than about 750 nm,
- B) without prior floodwise exposure to light, imagewise exposing said element with an infrared emitting laser,
- C) floodwise exposing said element, and
- D) contacting said element with an aqueous developing solution to remove the non-image areas of said photosensitive layer.
A method for imaging a photosensitive element comprising the steps of, in order:
- A) providing a negative-working photosensitive element consisting essentially of a grained and anodized aluminum support having thereon, as the outer layer, a single negative-working layer comprising a photosensitive composition consisting essentially of a reaction product of a phenol-formaldehyde novolac resin and 2-diazo-1,2-dihydro1-oxo-4 or 5-naphthalenesulfonyl chloride, and a cyanine dye that absorbs infrared radiation having a wavelength of from about 800 to about 1100 nm,
- B) without prior floodwise exposure to light, imagewise exposing the element with an infrared emitting laser at an intensity at the photosensitive layer surface of from about 10 to about 1000 milliwatts/mm,
- C) floodwise exposing said element, and
- D) contacting said element with an aqueous developing solution to remove the non-image areas of said photosensitive layer.
Dependencies are inferred from the claim text.