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As monohydric or polyhydric phenols it is possible to use: Phenol, o-, m- and p-cresol, 1,2,4-, 1,2,6-, 1,2,3-, 1,2,5-, 1,3,4- and 1,3,5-xylenol, p-tertiary butylphenol, o-, m- and p-phenylphenol, the isomeric amylphenols, octylphenols and nonylphenols, pyrocatechol, resorcinol, hydroquinone, 1,4-dihydroxynaphthalene and other dihydroxynaphthalenes, 4,4'-dihydroxydiphenyl, 2,2'-dihydroxydiphenyl and other isomeric dihydroxydiphenyls, 2,2'-, 2,4'- and 4,4'-dihydroxy-diphenylmethane individually or as mixtures (also referred to as bisphenol F), 4,4'-dihydroxydibenzyl, and substituted dihydroxydiphenylmethanes such as are produced by acid condensation of phenols with aldehydes or ketones, especially 4,4'-dihydroxy-diphenyl-2,2-propane, so-called diphenylpropane or bisphenol A, which can be prepared from phenol and acetone, and also dihydroxydiphenylcyclohexane. As further examples there may be mentioned: 4,4'-Dihydroxy-3,3',5,5'-tetramethyldiphenylmethane, 4,4'-dihydroxy-3,3',5,5'-tetramethyldiphenyl-2,2-propane, 4,4'-dihydroxy-3,3' ,5,5'-tetra-p-tert.-butyldiphenyl-methane, 4,4'-dihydroxy-3,3',5,5'-tetra-p-tert.-butyl-diphenyl-2,2-propane, 4,4'-dihydroxy-3,3'-dimethyl-5,5'-di-p-tert.-butyldiphenylmethane, 4,4'-dihydroxy-3,3'-dimethyl-5,5'-di-p-tert.-butyl-diphenyl-2,2-propane, 4,4'-dihydroxy-3,3',5,5'-tetraamyl-diphenylcyclohexane, 4,4'-dihydroxy-3,3',5,5'-tetra-p-tert.-butyldiphenyl-cyclohexane and 4,4'-dihydroxy-3,3'-dimethyl-5,5'-di-p-tert.-butyl-diphenyl-cyclohexane.
