Kodak Polychrome Graphics, Gmbh

Eastman-kodak Company

Kodak Polcyhrome Graphics LLC

Kodak Polychrome Grpahics, LLC

Jeffery Allen Gurney

Paul R West

Paul Richard West

Thap DoMinh

John E Walls

Eugene Lynn Sheriff

Neil F Haley

John Kalamen

Thomas R Jordan

Gary Roger Miller

Ralph Scott Schneebeli

Christopher J Kloxin

A positive image can be obtained from a positive-working element that is sensitive to infrared radiation. The element comprises an imaging layer containing an alkali-soluble reactive resin (such as a phenolic resin), an infrared radiation absorbing compound, a thermochemical acid generating compound, and a dissolution inhibitor that has acid-cleavable C&mdash;O&mdash;C groups. Upon laser exposure, a Bronsted acid is generated which then breaks the bonds of the C&mdash;O&mdash;C groups, allowing the exposed regions of the reactive resin to be solubilized in an alkaline developer solution.

Positive-working imaging composition and element and method of forming positive image with a laser

An infrared imaging composition contains two essential components, a non-basic infrared radiation absorbing material (such as carbon black), and a phenolic resin that is either mixed or reacted with an o-diazonaphthoquinone derivative. These compositions are useful in positive-working or negative-working imaging elements such as lithographic printing plates that can be adapted to direct-to-plate imaging procedures.

Infrared-sensitive diazonaphthoquinone imaging composition and element

A positive-working lithographic printing plate is used to provide a positive image without a post-exposure baking step and without any floodwise exposure steps. The printing plate includes a layer that is imageable using an infrared radiation laser. This layer consists essentially of a phenolic resin, an infrared radiation absorbing compound, and a dissolution inhibitor that is non-photosensitive and is capable of providing sites for hydrogen bonding with the phenolic moieties of the binder resin.

Positive-working infrared radiation sensitive composition and printing

A positive image can be obtained from a positive-working element that is sensitive to infrared radiation. The element comprises an imaging layer containing an alkali-soluble reactive resin (such as a phenolic resin), an infrared radiation absorbing compound, a thermochemical acid generating compound, and a dissolution inhibitor that has acid-cleavable C--O--C groups. Upon laser exposure, a Bronsted acid is generated which then breaks the bonds of the C--O--C groups, allowing the exposed regions of the reactive resin to be solubilized in an alkaline developer solution.

1Postitve-working imaging composition and element and method of forming

Improved photopolymerization initiator systems are comprised of a spectral sensitizer that sensitizes in the ultraviolet or visible regions of the spectrum and an N-aryl, O-aryl or S-aryl polycarboxylic acid co-initiator. The improved initiator systems are incorporated in photo-polymerizable compositions containing one or more addition-polymerizable ethylenically-unsaturated compounds to form compositions suitable for the preparation of radiation-sensitive layers in lithographic printing plates adapted to be imagewise-exposed with ultraviolet- or visible-light-emitting lasers such as argon-ion lasers and frequency doubled Nd:YAG lasers. Such plates are able to effectively meet the dual requirements of very high photospeed and very good shelf-life required in computer-to-plate systems.

Sensitized photopolymerizable compositions and use thereof in

A photosensitive composition can be used to prepare negative-working photosensitive elements such as lithographic printing plates. The composition includes a first photocrosslinkable aromatic resin having photocrosslinkable groups and a number average molecular weight of at least about 1500. Also included is a mixture of a polyalkyleneglycol diacrylate and polyacrylate polymerizable monomers, a photocrosslinkable polyester, a photoinitiator, and a photosensitizer. The photosensitive resins are present at a total weight ratio to the polymerizable monomers of at least 1.5:1.

Photosensitive polymer composition and element containing photosensitive

Improved lithographic printing plates adapted to be imagewise-exposed with ultraviolet- or visible-light-emitting lasers such as argon-ion lasers and frequency doubled Nd:YAG lasers, are comprised of a radiation-sensitive layer and an oxygen barrier layer. The radiation-sensitive layer includes one or more addition-polymerizable ethylenically-unsaturated compounds and a photopolymerization initiator system comprised of a spectral sensitizer that sensitizes in the ultraviolet or visible regions of the spectrum and an N-aryl, O-aryl or S-aryl polycarboxylic acid co-initiator; the oxygen barrier layer comprises fully hydrolyzed polyvinyl alcohol; and a basic compound is incorporated in the oxygen barrier layer or the radiation-sensitive layer or both in an amount sufficient to control thermal fog susceptibility of the lithographic printing plate. Such plates are able to effectively meet the requirements of very high photospeed, freedom from thermal fog and very good shelf-life required in computer-to-plate systems.

Lithographic printing plates having a photopolymerizable imaging layer

A peel-developable lithographic printing plate is comprised of a substrate, a hydrophilic layer comprising a polymeric acid overlying the substrate, a radiation-sensitive image-forming layer overlying the hydrophilic layer and a stripping layer that is strippably adhered to the image-forming layer. The image-forming layer is comprised of a photo-polymerizable composition comprising a polymeric binder, a plurality of addition-polymerizable ethylenically-unsaturated compounds at least one of which possesses phosphorus-derived acidic functionality and a photopolymerization initiator. After imagewise exposure of the plate to activating radiation, the stripping layer is peeled from the image-forming layer with only the unexposed regions of the image-forming layer adhering thereto so as to reveal the underlying hydrophilic layer and thereby form a lithographic printing surface.

Peel-developable lithographic printing plate

A masking element is prepared with a photosensitive layer on a suitable support, overcoated with a masking layer containing an infrared absorbing compound and a thermally bleachable dye. The dye is bleached by imagewise laser irradiation, followed by floodwise exposure to produce an image in the photosensitive layer corresponding to the laser produced image. The outermost layers are removed and development provides a suitable negative-working printing plate.

Photosensitive element having integral thermally bleachable mask and

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.

Method of providing an image using a negative-working infrared

An infrared imaging composition comprises three essential components: a photocrosslinkable polymeric binder having pendant photopolymerizable olefinic double bonds, a polyazide photoinitiator and an infrared absorbing compound. These compositions are useful in photosensitive elements such as lithographic printing plates that can be used to provide images using lasers, followed by development.

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Greeley, CO, United States of America

Jeffery Allen Gurney