Abstract: This invention relates to a method of coating metal surfaces including zinc-coated steel with zinc, nickel and manganese phosphate crystals for the purposes of improving paint adhesion, corrosion resistance, and resistance to alkali solubility. Potassium, sodium, or ammonium ions present as a phosphate salt are combined with zinc ions and nickel and manganese ions in relative proportions to cause the nickel and manganese ions to form a crystalline coating on the surface in combination with the zinc and phosphate.

Abstract: A method for the removal and recovery of paint overspray in a water wash spray booth is disclosed. The method uses a circulating agitated dispersion of an organic solvent component in water which collects the paint overspray. The dispersion containing the overspray is permitted to phase separate into an organic phase and an aqueous phase. The organic phase is further treated such as by distillation to separate the paint solids from an organic solvent portion which contains the original organic solvent component and the organic solvents associated with the paint. The organic solvent portion can be recycled and reused in the circulating dispersion and the paint solids can be recovered for further use such as a filler for adhesives or can be disposed of.

Abstract: Disclosed herein is an effective stripping composition which is particularly useful in the removal of paint from paint booths, said stripping composition comprising a solvent and an effective thickening agent combination of silica microparticles and a co-thickening agent such as a metal salt.

Abstract: This invention relates to a method of coating metal surfaces including zinc-coated steel with zinc and nickel phosphate crystals for the purposes of improving paint adhesion, corrosion resistance, and resistance to alkali solubility. Potassium, sodium, or ammonium ions present as a phosphate salt are combined with zinc ions and nickel or manganese ions in relative proportions to cause the nickel or manganese ions to form a crystalline coating on the surface in combination with the zinc and phosphate.

Abstract: This invention relates to a method of coating metal surfaces including zinc-coated steel with zinc and nickel phosphate crystals for the purposes of improving paint adhesion, corrosion resistance, and resistance to alkali solubility. Potassium, sodium, or ammonium ions present as a phosphate salt are combined with zinc ions and nickel or manganese ions in relative proportions to cause the nickel or manganese ions to form a crystalline coating on the surface in combination with the zinc and phosphate.

Abstract: A crystal clear paint spray booth barrier coating comprising an aqueous solution of polyvinyl alcohol is disclosed. The polyvinyl alcohol may include a foam depressor for spray application of said coating. Fluorocarbon and non-ionic surfactants are disclosed for providing a smooth coating surface and improving the transparency of said coating. A polyacrylate thickener may be included to facilitate applying the coating to vertical surfaces. Methylparaben is disclosed for preventing the formation of mold on said coating and improving shelf life of the coating. The method disclosed includes mixing an aqueous solution of polyvinyl alcohol, at least one surfactant and a foam depressor, applying said mixture to the surfaces of the paint spray booth to be protected and equipment located in the paint spray booth, and allowing the coating to dry to a crystal clear coating. Methods of removing the coating include peeling the coating off as a film and water washing the coating.

Abstract: The paint denaturant composition of this invention includes mixing magnesium sulfate with complex silicate minerals. The complex silicate minerals disclosed include bentonite clay, kaolin clay, and diatomite preferably a mixture thereof. The paint denaturant composition as disclosed is preferably a slurry but may be a dry powder composition. Additives incorporating magnesium sulfate, or a combination of magnesium sulfate, a polyelectrolyte and water, are also disclosed for use with paint denaturant compositions including silicate minerals. The addition of a polyelectrolyte solution to the magnesium sulfate and complex silicate mineral paint denaturant composition is also disclosed for improving floculation prior to filtration or mechanical separation.

Abstract: This invention relates to a method of coating a metal surface with zinc and iron phosphate crystals for the purpose of improving corrosion resistance by means of a buffered zinc phosphate solution containing zinc dihydrogen phosphate and a monovalent, alkali metal salt of phosphate in proportions such that a fine, horizontal crystal structure consisting of tertiary zinc phosphate, zinc ferrous phosphate and other crystals of zinc ferrous phosphate is formed on the metal surface. The invention also relates to this composition.

Abstract: Disclosed is an aqueous acidic developing solution for a photoresist comprising an acid having from about 1 to 8 carbon atoms, in an effective combination with a solubilizing solvent for the photoresist.