Organic phosphate compositions

摘要

Film-forming compositions are prepared by mixing one mole of phosphorus pentoxide with 0.2 to 12.5 moles of a styrene/allyl alcohol copolymer and 0.3 to 5.0 moles of an alkyl phenol, and heating the mixture at 75 DEG to 150 DEG C. The copolymer may be a copolymer of allyl alcohol with styrene or a substituted styrene, e.g. chlorostyrene or methylstyrene, of molecular weight 750 to 1500. Preferred phenols contain 1 to 10 carbon atoms in the alkyl group. The compositions may be dissolved in organic solvents, e.g. alcohols, ethers, ketones and aromatic hydrocarbons, and applied to brass, copper, aluminium and ferrous metals to provide corrosion resistant prime coatings. Examples describe the reaction of phosphorus pentoxide, a styrene/allyl alcohol copolymer and amyl phenol, heptyl phenol, cresol, polyisobutyl phenol/cresol mixtures, nonyl phenol and polyisobutyl phenol, the polyisobutyl groups being derived from polyisobutylene of molecular weight about 350.ALSO:Metal substrates may be primed and protected from corrosion by applying thereto by spraying, brushing or dipping, solutions of products prepared by mixing 1 mole of phosphorus pentoxide, 0,2-12,5 moles of a copolymer of allyl alcohol with styrene or a substituted styrene and 0,3-5,0 moles of an alkyl phenol, and heating the mixture at 75-150 DEG C. Preferred phenols contain 1-10 carbon atoms in the alkyl groups. The products may be dissolved in alcohols, ethers, ketones and aromatic hydrocarbons and applied to ferrous metals, galvanized iron, brass, copper and aluminium followed by evaporation of the solvent at normal or elevated temperatures. Examples describe the coating of brass, copper, galvanized iron and steel panels with solutions of the products prepared from copolymers of allyl alcohol and styrene, phosphorus pentoxide and amyl phenol, heptyl phenol, cresol, polyisobutyl phenol/cresol mixtures, nonyl phenol and polyisobutyl phenol, the polyisobutyl group being derived from polyisobutylene of molecular weight 350. The treated metals may be painted with alkyd enamels.