摘要:
A process for the production of lithographic printing plate precursors with a coating comprising a diazo resin is described, wherein a solvent mixture comprising (i) 2 to 9.9 wt.-% 1-methoxy-2-propanol, (ii) 20 to 50 wt.-% of at least one ketone with a boiling point below 130°C, (iii) 20 to 60 wt.-% of at least one alkanol with a boiling point below 120°C, and (iv) 10 to 30 wt.-% ethyl lactate, and a slot coater are used.
摘要:
Es wird ein lichtempfindliches Gemisch beschrieben, das ein lichtempfindliches Diazoniumsalz-Polykonden sationsprodukt und zur Erhöhung der Lichtempfindlichkeit ein unsubstituiertes oder durch eine Azo- oder Hydroxygrup pe substituiertes Amin enthält.
摘要:
Es wird ein lichtempfindliches Gemisch beschrieben, das ein Diazoniumsalz-Polykondensationsprodukt und eine der Aminosäuren Asparagin, Alanin, Arginin, Asparaginsäure, Citrullin, Dihydroxyphenylalanin, Glutaminsäure, lsoleucin, Methionin und Threonin als Stabilisator enthält.
摘要:
A photosensitive composition including a water-soluble aromatic diazo compound having at least two diazo groups and lactic acid, hydroxyacetic acid or, a mixture thereof in an amount of at least one third by weight of the diazo compound. The photosensitive composition is in the form of a liquid or paste, is thus easy to handle, is suitable for use in the production of photosensitive printing plates, and has good storage stability.
摘要:
A presensitized lithographic printing plate precursor is described, comprising an aluminum support that has been rendered hydrophilic having provided thereon a light-sensitive layer composed of a light-sensitive composition comprising (1) an organic solvent-soluble and substantially water-insoluble diazo resin, (2) a substantially water-insoluble, film-forming polymeric compound, and at least one of (3a) an organic solvent-soluble polymeric compound having a sulfonic acid group or a sulfonic acid salt group in its side chain and (3b) a substituted or unsubstituted dipicolinic acid or a salt thereof, the total amount of (3a) and (3b) components being about 1 to about 100% by weight, based on the weight of the diazo resin.
摘要:
A light-sensitive composition for use with lithographic printing plates is described which comprises (1) a light-sensitive, organic solvent soluble and substantially water-insoluble diazo resin which is the reaction product of a water-soluble, light-sensitive condensate of an aromatic diazonium compound and an organic condensing agent with a halogenated Lewis acid or a salt thereof, (2) a substantially water-insoluble, film forming organic high-molecular weight compound having an acid value of from 10to 200, (3) a polynuclear aromatic sulfonic acid or a salt thereof, and (4) a salt-forming organic dye compound.
摘要:
The sensitivity of a photosensitive composition based on an aromatic diazonium salt which gets sticky upon exposure to light, is improved by adding a salt of a compound of the general formula: wherein R 1 and R 2 each represents a straight chain alkyl group, and X, Y and Z each represents H, a straight chain alkyl group or an alkoxy group, but two or more of X, Y and Z cannot be H at the same time. Such compositions are used to form a pattern of powder coat layer on a substrate, e.g. a colour television picture tube.