摘要:
A photopolymerizable mixture is disclosed that comprises,a) a polymeric binder,b) an acrylate or alkacrylate of a polyhydric alcohol containing one or more urea groups and one or more urethane groups,c) a photoreducible dye as photoinitiator,d) a trihalomethyl compound which can be cleaved by irradiation, ande) an acridine or phenazine compound which is active as a photoinitiator.The mixture is suitable for the production of printing plates and photoresists and is distinguished by an increased shelf life.
摘要:
A photopolymerizable mixture is described, which contains a polymeric binder; an acrylate or alkacrylate of a polyhydric alcohol possessing at least one photooxidizable group; a compound or a combination of compounds being capable of initiating the polymerization of the ester under the action of light in the spectral region of 450 nm to 650 nm; and at least one compound which absorbs light in the region below 450 nm or which upon exposure forms a compound absorbing light in said region, whereby the optical density of the exposed mixture in this region is at least 2.0 at a layer thickness of 2 .mu.m. The mixture is useful for the production of masters or intermediate masters for reprographic layers being sensitive to light in the UV region, exposure of the mixture itself being performed with visible light.
摘要:
The invention describes a photopolymerizable recording material which comprises a photopolymerizable layer and a cover layer. The cover layer comprises a polymer which possesses low permeability to atmospheric oxygen and is soluble in water, and a water-soluble dye which absorbs light in the region from 300 to 700 nm and within this range has a non-absorbent region corresponding to the emission range of the copying light source.The material can be sensitized for various spectral regions, for example, for UV light, visible light or laser light and has a higher resolving power than a corresponding material which does not contain a dye in the cover layer, while its photosensitivity remains unchanged or is only slightly reduced.
摘要:
A photopolymerizable recording material is diclosed comprising a base material, a photopolymerizable layer and a cover layer which comprises a water-soluble polymer which is substantially impermeable to atmospheric oxygen, and a polymer which binds atmospheric oxygen and is virtually completely soluble in water at 20.degree. C. The material displays reduced sensitivity to atmospheric oxygen, even on prolonged storage and at elevated ambient temperatures and elevated atmospheric humidity.
摘要:
A photopolymerizable mixture is described which comprises a polymeric binder, a compound which is polymerizable by free radicals and has at least one polymerizable group and a photoreducible dye and a dicyclopentadienyl bis(2,4,6-trifluorophenyl)-titanium or -zirconium as photoinitiator. The mixture is suitable for producing printing plates and photoresists and is distinguished by particularly high photosensitivity, in particular in the visible region of the spectrum, and by very good thermal stability. It can be imaged in particular with laser radiation in the visible region.
摘要:
The present invention relates to a process for preparing a multicolored proof, using a radiation-sensitive recording material which comprises a temporary, sheet-shaped layer support, a thermally transferable layer containing a colorant in one primary color and a radiation-sensitive layer. The process comprises the steps of: a) exposing the recording material imagewise b)developing the exposed layer with an aqueous-alkaline solution to uncover the thermally transferable image areas, and c) contacting the coated side of the recording material with an image receptor and transferring the transferable image areas to the image receptor, with the application of heat and pressure, to produce a partial image in the first primary color. The above-described process steps are repeated at least once, using a radiation-sensitive recording material which contains a colorant in another primary color in its thermally transferable layer. Depending upon the respective embodiment, the process of the invention yields a proof which can be produced by a positive, a negative or a digital method, without distorting the image thus generated by interjacent layers.
摘要:
A photopolymerizable mixture is described which comprises a polymeric binder, a free-radically polymerizable compound having at least one polymerizable group, a photoreducible dye, a trihalomethyl compound which can be cleaved by radiation and a metallocene compound as photoinitiators. The mixture is suitable for use in the production of printing plates and photoresists and is characterized by a particularly high photosensitivity, especially in the visible spectral region. The mixture can therefore be used for the production of images, in particular by means of laser radiation in the visible region.
摘要:
An aftertreatment apparatus, for printing plates which have been exposed imagewise comprises an exposure station and a heat station which are disposed one behind the other in the direction of conveyance of the printing plates along a conveyor track through the aftertreatment apparatus. The exposure station contains a regulable radiation source for the total area exposure of the printing plates. The housing of the exposure station has an exposure aperture 13 which faces downwardly and which is covered by a filter disc. The housing of the heat station is thermally insulated at three sides and is open downwards in the direction of a reflector table across which the printing plates are fed.
摘要:
A negative-working radiation-sensitive mixture comprising a binder and a polymer containing 1,2,3-thiadiazole groups is disclosed. The binder is a polyfunctional compound having functional groups that react with ketene. The polymer is a compound obtained by polymerization of a compound of the general formula I ##STR1## in which R is a polymerizable group. If the polymer is a copolymer containing comonomers having functional groups capable of reacting with ketene, the binder can be omitted. The negative-working radiation-sensitive mixture is particularly suitable for UV, electron beam and X-ray lithography.
摘要:
A preexposure device having a linear LED arrangement for preexposing printing forms over their full area. The linear LED arrangement comprises at least two rows of LED modules which are offset with respect to one another. Each module is made up of a plurality of light-emitting diodes. The linear LED arrangement is disposed within a housing which is closed off at the bottom by means of a light scattering plate.