Abstract:
THIS APPLICATION RELATES TO A METHOD FOR PREPARATION OF THIN-LAYER CHROMATOGRAPHY PLATES BY SPRAYING BACKING PLATES WITH CERTAIN AEROSOL COMPOSITIONS, AND TO THE AEROSOL COMPOSITIONS, WHICH COMPRISES A POWDERED ADSORBENT, A BINDER, A DISPERSION MEANS AND A PROPELLANT. THE FOLLOWING IS AN EXAMPLE OF A PREFERRED COMPOSITION:
G. POWDERED SILICA GEL 15.0 ELVAMIDE 8063 POLAMIDE RESIN 2.6 ETHANOL 36.4 METHYLENE CHLORIDE 26.0 MONOCHLORODIFLUOROMETHANE 20.0 100.0
THE COMPOSITIONS ARE PARTICULARLY USEFUL IN THAT THEY CONTAIN A BINDER WHICH BINDS THE COMPOSITION FIRMLY TO THE BACKING PLATE.
Abstract:
An acidic zinc electroplating bath comprising zinc fluoborate dissolved in an aqueous liquid containing as an iron- and metal oxide-deposition inhibitor a small effective amount of a mixture of a 4-hydroxy-, 4-alkyl- or aryl-, 5-acyl- or aroyl-piperidine and thiourea or N-substituted derivative thereof. The invention also includes an improved process for zinc-electroplating ferrous metals from such bath.