REACTION PRODUCTS OF SULPHUR DIOXIDE WITH SCHIFF'S BASES AND THEIR USE AS METAL TREATMENT AGENTS

摘要

1519911 Controlling plaster or cement setting times CIBA GEIGY AG 18 Feb 1977 [21 Feb 1976] 6935/76 Heading C 1H [Also in Divisions C2, C7 and C5] The setting times of plaster or cement are controlled by incorporating therein a compound or mixture of compounds of the formula wherein X is OH or NHR', Y is hydrogen or NH 3 R1, with the proviso that when X is OH Y cannot be hydrogen, R1 is a saturated or unsaturated aliphatic or cycloaliphatic hydrocarbon radical containing from 1 to 20 carbon atoms optionally substituted by one or more halogen, cyano, nitro, hydroxyl, carboxyalkyl or sulphoxyalkyl radicals in which the alkyl group contains from 1 to 4 carbon atoms and R2 is an aryl, alkaryl or aralkyl radical containing from 6 to 20 carbon atoms which may be optionally substituted by one or more cyano, nitro, halogen, hydroxyl, carboxyl, carboxyalkyl in which the alkyl group contains from I to 4 carbon atoms, hydroxymethyl or methoxymethyl radicals.