GB948201A - Condensation product of a phenol and an unsaturated hydrocarbon - Google Patents

Abstract

Meta or para-diisopropenyl benzene or a mixture thereof is condensed with phenols at elevated temperatures in the presence of acidic alkylation catalysts. The phenol may be phenol itself, a bisphenol, or their alkylated derivatives having 1-4 carbon atoms per alkyl group, p-cresol, phenol, and bisphenol A being preferred. The diisopropenyl benzenes preferably accounts for 44-56 mole per cent. of the reactants. 0.8 to 1.25 mole of phenol per mole of diisopropenyl benzene are preferred, but excess phenol may be present. A solvent, e.g. aromatic hydrocarbons may be present. 60-125 DEG C. is preferred and the preferred catalysts are mineral acids e.g. sulphuric, these being usually 0.25-1% by weight of reactants. Reaction generally takes 2-6 hours, when the catalyst is normally neutralized with NaOH and volatiles are removed under vacuum. Films may be formed from solutions of the product in e.g. benzene or methyl ethyl ketone.ALSO:Condensates prepared from diisopropenyl benzene (DIPB), and phenols are used to make films on glass slides as follows: Example 1-50% solution in methyl ethyl ketone of p-cresol-p-DIPB condensate; Example 2-50% solution in benzene of phenol-p-DIPB condensate; Example 3-50% solution in benzene of phenol-m-DIPB condensate; Example 4-50% benzene solution of bisphenol A-p-DIPB condensate; Example 5-50% benzene solution of phenol-p-DIPB condensate; Example 6-as in 5 using m-DIPB; these solutions were cast on to microscope slides and dried at room temperature.