84-87-7Relevant articles and documents
Process for aryl-quinone and aryl-naphthoquinone diazide sulfonic acids
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, (2008/06/13)
A process for the preparation of aryl-diazide-sulfonic acids by a series of sequential in-situ process steps. The process comprises the nitrosation of a hydroxyarylsulfonic acid; conversion of the nitroso-derivative to a sulfamate which is then diazotized to the diazide. Temperature and pH are maintained in predetermined ranges to maintain the reaction products in solution without the formation side-products or the need to isolate intermediates. The process of the invention is particularly useful in the preparation of light-sensitive materials such as naphthoquinonediazide sulfonic acids which are used in the preparation of photoresist compositions. The invention provides a high purity product at a high material efficiency, high equipment utilization, low effluent discharge, and reduced cost.
Method for producing 1-naphthol-4-sulphonic acid
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, (2008/06/13)
Disclosed is a method for producing 1-naphthol-4-sulphonic acid in free acid form and contaminated with less than 2% by weight of the isomeric 1-naphthol-2-sulphonic acid.