A novel improved urethane, urethane coating formed of epxoy resin and polyisocyanate for metallic or non-metallic substrates and the like exhibits improved resistance to blistering under high moisture conditions. The coating includes an epoxy resin having functional hydroxyl groups, for example, the reaction product of epichlorohydrin and bisphenol A. A hardener is included which comprises one or more selected polyisocyanates, preferably a mixture of a selected aliphatic biuret type polyisocyanate and an aromatic diisocyanate. A coupling agent, preferably an epoxy-containing silane, is included. A catalyst such as zinc octoate, pigments such as leachable chromates and organic solvent for the components may also be included. The pigments are held in suspension through the use of a suspending agent. The ratio of --OH groups of the epoxy resin to --NCO groups in the hardener is about 1:1.4-3.6.
A method for cationic electrocoating which comprises electrocoating a substrate in an electrocoating composition comprising an electrocoating resin having a reactive group admixed with a paste comprising a chromate pigment in a water-insoluble or hardly soluble, reactive group-containing organic binder and said paste having a water content of not more than 2% by weight and said composition having a concentration of 200 to 5,000 ppm in terms of CrO.sub.3, the reactive group in the electrocoating resin being crosslinkable with the reactive group in the organic binder. The formed electrocoating film has high rust prevention.
The invention relates to a composition that can be applied to the nail, that is presented in translucent form, and that comprises at least one film-forming agent, at least one plasticizing agent, at least one solvent, and silica. The composition obtained can be applied properly and in sufficient quantity to the nail and makes it possible to obtain a transparent film with a degree of brilliance.
A primer composition for metallic material comprising (a) a urethane epoxy ester resin having primary hydroxyl groups and a number average molecular weight of 6000 to 12,000, (b) a chromate anticorrosive pigment and (c) a polyethylene wax having a density of 0.94 or more, a molecular weight of 1000 to 10,000 and an acid value of 15 or less (KOH mg/g), the pigment volume concentration being 24 to 45% of the total solids of the composition. A chemical pretreatment on various metallic materials for improvements in scratch resistance, corrosion resistance and the like can be obviated by the use of said primer composition.
A coating composition for the protection of metallic and non-metallic substrates against corrosion, comprising a film-forming polymer; at least one particulate metallic pigment in an amount ranging from about 30% to about 60% by weight based on the total weight of the composition; an agent for control of electrical conductive characteristics having an oil absorption value of less than 20 (determined by ASTM standard D 281-84), the volumetric ratio of the control agent to the metallic pigment ranging from 0.7:1 to 1.25:1; an agent for control of rheological characteristics; and at least one solvent compatible with the polymer.
A coating composition for the protection of metallic substrates against environmental attack comprising, in weight percent, from about 10% to about 30% of at least one film-forming polymer such as epoxy resins having an epoxide value of about 250 to about 2500, vinyl chloride resins copolymerized with polyisocyanates, polyurethane resins, and polyester resins; from about 40% to about 55% particulate metallic zinc; from about 4.75% to about 7% zinc-coated hollow glass-like microspheres having diameters ranging from about 2.5 to about 60 microns, the volumetric ratio of the metallic zinc to the microspheres ranging from about 0.8:1 to 1.2:1; from about 1.5 to about 3% of at least one particle size grade of pyrogenic amorphous silica having an average particle size ranging from about 0.007 to about 0.04 micron; and not more than 30% solvents compatible with the film-forming polymer. A dried coating of this composition, having a thickness of at least about 4 mils (about 100 microns), is cathodic and electrically non-conductive.
