QUANTITATIVE-ANALYSIS OF ERT-BUTYL-4-METHYLPHENOL(BUTYLATED-HYDROXYTOLUENE) ANTIOXIDANT IN A SOLVENT-FORMULATED LIQUID POLYCHLOROPRENE ADHESIVE AND IN CURED POLYCHLOROPRENE ADHESIVE FILMS

Two simple methods using internal standards are described for the quan titative analysis of 2,6-di-tert-butyl-4-methylphenol (butylated-hydro xytoluene, BHT) antioxidant in samples of solvent-formulated liquid ad hesive and in cured polychloroprene adhesive films. Because only very small samples of cured adhesive could be taken from articles or compon ents without substantially detracting from the product, the methods we re developed to use minimal quantities of cured adhesive. The pyrolysi s gas chromatography (PyGC) method required less than 1 mg of adhesive for analysis. The extraction method required less than 100 mg. A sati sfactory correlation (r = 0.8) was obtained between the two methods. R ecovery of BHT by extraction from cured Neoprene adhesive was better t han 90%. Using 2,6-di-tert-butylphenol as internal standard, the error for the PyGC analysis method was 10%, while that of the extraction me thod was 1%.