Abstract:
Imageable precursors for masks and for electronic parts comprise a polymeric layer applied to a substrate. The layer comprises at least one polymer having infra-red absorbing groups carried as pendent groups on the polymer backbone. Certain infrared absorbing groups may also act to insolubilize the polymer in a developer, until it is imagewise exposed to infra-red radiation. Imagewise application of heat, resulting from imagewise exposure of the precursor to infra-red radiation, renders the polymer layer more soluble in the developer than prior to exposure to the infra-red radiation.
Abstract:
Infra-red absorbing polymers useful in imageable products and the lithographic printing field comprise infra-red absorbing groups carried as pendent groups on a polymer backbone. Certain infra-red absorbing groups may also act to insolublize the polymer in a developer, until it is imagewise exposed to infra-red radiation. The resulting heat renders the polymer soluble in the developer. Imageable products employing the infra-red absorbing polymers may include positive working lithographic printing plates.
Abstract:
A method for imaging patterning compositions comprising the steps of: (1) providing at least one patterning composition layer on a substrate; said patterning composition comprising: (a) at least one acid generator; (b) at least one cross linking resin or compound; (c) at least one binder resin comprising a polymer containing reactive pendant group selected from group consisting of hydroxyl, carboxylic acid, sulfonamide, active imide, alkoxymethylamides and mixtures thereof; and (d) at least one infrared absorber; (2) imagewise exposing the patterning composition layer to actinic radiation; (3) treating the imaged patterning composition layer with heat energy to treat the imaged portions of the composition layer; (4) flood exposing the heat-treated, imaged patterning composition layer with UV light for a predetermined time, said time being sufficient to promote the effective clear-out of non-imaged portions during the developing step without causing substantial deterioration of the imaged portions; and (5) developing the flood exposed, heat-treated imaged patterning composition with an aqueous alkaline developer to remove the non-imaged areas of the patterning composition layer and leaving the imaged areas substantially unaffected.
Abstract:
The invention provides a lithographic printing for precursor having an imagable coating on an aluminum support, wherein the imagable coating comprises a polymeric substance comprising colorant groups, and wherein the aluminum support on which the coating is provided is anodized but not subsequently modified by means of a post-anodic treatment compound, and the coating does not comprise a colorant dye. The polymeric substance may also comprise pendent infra-red or developer dissolution inhibiting groups, and these groups may also be the colorant groups themselves.
Abstract:
A method for applying a matting layer to a radiation-sensitive layer of a printing plate precursor comprises: (a) providing a matting composition comprising a polymer and a solvent, wherein the matting composition has a solid content of more than 10% and no more than 50% by weight based on the total composition; and (b) spraying the matting composition on the radiation-sensitive layer using an electrostatically aided rotary atomizer having a bell speed of more than 10,000 rpm, wherein the distance between the bell and the radiation-sensitive layer to be coated is less than 50 cm.
Abstract:
Disclosed is a thermally sensitive imagable article and compositions therefor. The imagable article comprises a coating on a substrate, the coating comprising an amino acid or amide, and a compound capable of generating an acid upon heating. The coating optionally comprises a radiation absorbing compound. When imagewise exposed the coating has the property that exposed regions become relatively insoluble in a developer liquid whereas regions that have not been exposed remain relatively soluble in the developer and dissolve in the developer, leaving the exposed substrate in those regions.
Abstract:
A lithographic printing plate substrate is conditioned for imaging in a printer engine by attaching a leader to the leading edge. The leader is sufficiently flexible to be drawn into the printer engine and is adapted to pull the plate substrate through the printer engine.
Abstract:
A negative-working image forming process which comprises the steps of: (1) flood exposing with actinic radiation a photosensitive assembly that comprises: (a) a hydrophilic support which can be used as a lithographic base and having thereon; (b) a first layer comprising: (i) at least one polymer that is soluble or dispersible in an aqueous alkaline solution; (c) a second layer on top of the first layer, the second layer comprising at least one o-quinonediazide compound; whereby the flood exposure causes the at least one o-quinonediazide compound to be converted to the corresponding indenecarboxylic acid compound; and (d) at least one photothermal conversion material in either the first layer or the second layer or both; (2) imagewise exposing the flood exposed photosensitive assembly with infrared radiation to thereby convert the indenecarboxylic acid compound in the second layer in the imagewise exposed areas to the corresponding indene compound; and (3) developing the imagewise exposed photosensitive assembly with an alkaline developing solution to dissolve out the imagewise unexposed areas of the second layer and the areas of the first layer underlying the imagewise unexposed areas of the second layer and thereby produce a negative working image.
Abstract:
A method for producing printing plate precursors by dual-feed technology is described. The obtained printing plate precursors contain polymer particles in the photosensitive layer and show high print run stability.
Abstract:
A lithographic printing plate substrate is conditioned for imaging in a printer engine by attaching a leader to the leading edge. The leader is sufficiently flexible to be drawn into the printer engine and is adapted to pull the plate substrate through the printer engine.