| 摘要 |
1. Process for producing negative images from a positive photoresist, by means of the following process steps : A) The preparation of a photosensitive mixture comprising a) about 1 to 25 per cent by weight, based on the solid components of the mixture, of a photosensitive compound of the general formula (I) see diagramm : EP0212482,P12,F1 in which R1 denotes 2-diazo-1,2-benzoquinone-4-sulphonyl, 2-diazo-1,2-naphthoquinone-4-sulphonyl or 2-diazo-1,2-anthraquinone-4-sulphonyl, R2 , R3 and R4 are identical or different and denote hydrogen, R5 , -OR6 or -CO-R7 , R5 and R7 denote alkyl, aryl or aralkyl, and R6 denotes hydrogen, alkyl, aryl, aralkyl or R1 , b) about 75 to 99 per cent by weight, based on the solid components of the mixture, of a novolak or a polyvinylphenol, preferably poly-p-vinylphenol resin, c) about 0.5 to about 20 per cent by weight, based on the solid components of the mixture, of a crosslinking agent which is capable of crosslinking the resin as in b) in the presence of acid produced from the photodecomposition products, and d) a sufficient amount of solvent to dissolve the above compounds, B) the coating of a coating base with the photosensitive mixture as in A), C) the pre-drying of the solution at temperatures in the range 20 to 100 degrees C until the solvent has essentially evaporated, D) image exposure of the photosensitive coating with actinic irradiation, E) the conditioning of the exposed coating at temperatures in the range from at least 95 degrees C to about 160 degrees C over the course of 10 seconds and more, during which time the crosslinking takes place, F) the removal of the non-exposed areas of the coating using an alkaline developer. |
