Abstract:
A radiation-sensitive recording material comprising a support and first and second radiation-sensitive layers is disclosed. The first radiation-sensitive layer comprises a 1,2-quinone diazide as the radiation-sensitive compound and the second radiation-sensitive layer comprises (a) a compound which forms a strong acid under the action of actinic radiation, (b) a compound which has at least one acid-cleavable C-O-C bond and (c) a polymeric binder. The recording material has an improved storage stability as compared with materials which comprise only radiation-sensitive layers based on acid-cleavable compounds.
Abstract:
The invention relates to a recording material for the production of an offset printing plate, having a substrate on whose front a photosensitive image layer is present and on whose back a layer of an organic polymeric material having a glass transition temperature Tg of 45° C. or more is present. The photosensitive image layer, or any top layer present thereon, has a pigment layer formed thereon.
Abstract:
A positive-working recording material is disclosed that has an aluminum base and a mat-finished radiation-sensitive layer that contains a 1,2-naphthoquinone-2-diazide as radiation-sensitive compound and a binder which is insoluble in water but soluble or swellable in aqueous alkali. The radiation-sensitive 1,2-naphthoquinone-2-diazide is an ester of 1,2-naphthoquinone-2-diazide-4- or -5-sulfonic acid and a phenolic compound that contains at least 2, preferably at least 3, phenolic hydroxyl groups, which ester has a phenolic hydroxyl group content of at least 0.5 mmol/g and a diazo unit content of at least 1.5 mmol/g. The binder is a phenol/formaldehyde novolak that contains at least 5 mmol/g phenolic hydroxyl groups, the phenol component of which contains at least 30 mol percent m-cresol and at least 10 mol percent of at least one xylenol and which has a weight-average M.sub.w of 2,000 to 12,000 (determined by means of GPC with polystyrene as standard). The radiation-sensitive layer additionally contains at least one phenolic additive which has a molecular weight M.sub.w of not more than 600 and contains 2 to 4 uncondensed phenyl nuclei and at least 6 mmol/g phenolic hydroxyl groups.
Abstract:
An electrophotographic recording material comprising: an electrically conductive base layer; a photoconductive layer which can be de-coated with alkaline solutions, the photoconductive layer comprising an organic photoconductor, a sensitizer and a binder comprising a mixture of: a) a copolymer comprising units composed of a first vinyl aromatic compound and units composed of maleic anhydride and/or a maleic partial ester, and b) a copolymer comprising units composed of a second vinyl aromatic compound and units of (meth)acrylic acid.
Abstract:
A process for developing irradiated radiation-sensitive recording materials using an aqueous-alkaline developer which contains compounds of the formula (I) ##STR1## wherein A is H, Na, K, NH.sub.4 or NR.sub.4, where R is a substituted or unsubstituted alkyl radical, W and X, independently of one another are H or --CH.sub.2 --COOA, Y is H or COOA and Z is H or OH, wherein the compound of the formula (I) contains at least 3 COOA units.
Abstract:
The invention relates to a non-continuous matte layer that can be used with a recording material having a substrate and a radiation-sensitive layer which contains a 1,2-naphthoquinone-2-diazide and an organic, polymeric binder which is insoluble in water but soluble in aqueous alkaline solutions. This matte layer comprises 100 to 10,000 particles per square centimeter which have a mean diameter of less than 40 .mu.m and a maximum diameter of less than 80 .mu.m and a mean height of 2 to 6 .mu.m and a maximum height of 10 .mu.m, and contains a resin which has up to 0.80 mmol of acid groups and/or salt groups per gram. The matte layer is obtained by spraying on and drying an aqueous, anionically or anionically/nonionically stabilized dispersion of the resin.
Abstract:
Grained, anodized and hydrophilized lithographic printing plates which have a negative or positive working radiation-sensitive coating, are exposed and are developed in an aqueous alkaline solution, are subjected, after hydrophilization, to a treatment with a salt solution containing divalent or polyvalent cations in a concentration of not less than 0.02 mol/l, thereby minimizing degradation of the plate and contamination of the printing forms and the development apparatus.
Abstract:
A radiation-sensitive mixture, in particular photosensitive mixture, is disclosed that contains a compound which forms a strong acid on exposure to actinic radiation and a polymeric reaction product of (i) a polymeric organic compound containing free OH groups, (ii) an organic compound containing at least two isocyanate groups or at least two epoxy groups, and (iii) a compound containing repeating acid-cleavable acetal or ketal groups and at least one free OH group. The mixture yields printing plates or photoresists with a longer storage life.
Abstract:
A positive-working, radiation-sensitive mixture which contains an organic, polymeric binder which is insoluble in water but soluble or at least swellable in aqueous alkaline solution and at least one IR-absorbing dye, is described. A daylight-insensitive recording material which can be provided with an image using IR radiation and has a substrate and a layer comprising the mixture is also disclosed. After imagewise exposure, in particular to IR laser beams, and development with an aqueous alkaline solution, an offset printing plate can be formed therefrom.
Abstract:
A positive-working or negative-working radiation-sensitive mixture includes as an IR absorbing component a carbon black pigment having a primary particle size smaller than 80 nm. The carbon black pigment is predispersed in a polymer containing acidic units having a pK.sub.a of less than 13. The radiation-sensitive component may include an ester of (i) a 1,2-naphthoquinone-2-diazide-4-sulfonic acid or a 1,2-naphthoquinone-2-diazide-5-sulfonic acid and (ii) a compound having at least one phenolic hydroxyl group, such as 3 to 6 phenolic hydroxyl groups. After imagewise radiation exposure, the recording material including the radiation-sensitive mixture can be developed without difficulties in an aqueous alkaline solution without leaving residual coating on the areas that became soluble or that remained soluble upon exposure.