Melamine formaldehyde scratch resistant coating composition, method of applying, and article produced thereby

Claim 1

THE METHOD OF FORMING A SCRATCH RESISTANT FLEXIBLE COATING ON A SHEET OF SYNTHETIC ORGANIC THERMO-PLASTIC RESIN WHICH COMPRISES CONDENSING MELAMINE AND FORMALDEHYDE IN THE PRESENCE OF NORMAL BUTANOL, THE UPPER LIMIT OF THE FORMALDEHYDR IN PROPORTION TO THE MELAMINE BEING IN THE APPROXIMATE RATIO OF 4 MOLS OF FORMALDEHYDE TO 1 MOL OF MELAMINE TO FORM A SOLUTION OF CHEMICALLY UNMODIFIED MELAMINE FORMALDEHYDE IN A SOLVENT CONSISTING ESSENTIALLY OF WATER AND BUTANOL, THE BUTANOL BEING PRESENT IN A PREDOMINANT AMOUNT, PLASTICIZING THERE RESIN BY THE ADDITION OF THE LINEAR POLYAMID FORMING NEUTRAL SALT OF AN UNSUBSTITUTED STRAIGHT CHAIN POLYAMINE THE TERMINAL CARBON ATOMS OF WHICH EACH CONTAIN A PRIMARY AMINE, AND AN UNSUBSTITUTED STRAIGHT CHAIN ALIPHATIC DIBASIC ACID, DEPOSITING THE MIXTURE ON THE SHEET TO A COATING OF CHEMICALLY UNMODIFIED MELAMINE FORMALDEHYDER CONDENSATION PRODUCT THEREON, DRYING THE COATING AT A TEMPERATURE BELOW 90* F. UNTIL IT IS SLIGHTLY TACKY TO THE TOUCH, AND PRESS POLISHING THE COATED SHEET, USING HEAT AND PRESSURE TO CURE THE COATING.