Abstract: The present invention relates to a paint film embodying a new parameter representing the resistance to raindrop fouling and having very satisfactory fouling resistance, particularly resistance to raindrop fouling, even ultra-low foulability, as well as high water resistance, acid resistance, alkali resistance, and crack resistance; a coating composition capable of providing said paint film; a method for forming a satisfactory paint film using said coating composition; and an article coated with said paint film. A coating composition comprising (I) a tetramethoxysilane partial hydrolyzed condensate and at least one member selected from (A) a film-forming resin and (B) an inorganic binder containing alkoxysilyl as a reactive curing group and having a water dynamic reverse tension (Tr) of not less than 55 dyn/cm; and an antifouling paint film containing the coating composition is provided.

Abstract: The present invention relates to a water-based coating composition suited for surface treatment of the metal sheets or plates to be used in building materials, household electric appliances, automobiles and so forth. The object of the present invention is to provide a water-based coating composition for the steel or metal coated steel surface treatment which gives coating films firmly adhering to metal plates and showing a high degree of hardening as well as excellent corrosion resistance, water resistance and weldability upon baking under low-temperature short-period conditions, has electric conductivity suited for electrodeposition coating and provides lubricating property in processing to thereby prevent powdering during processing as well as a method of forming coating films using said composition.

Abstract: The present invention relates to a water-based coating composition suited for surface treatment of the metal sheets or plates to be used in building materials, household electric appliances, automobiles and so forth. The object of the present invention is to provide a water-based coating composition for the steel or metal coated steel surface treatment which gives coating films firmly adhering to metal plates and showing a high degree of hardening as well as excellent corrosion resistance, water resistance and weldability upon baking under low-temperature short-period conditions, has electric conductivity suited for electrodeposition coating and provides lubricating property in processing to thereby prevent powdering during processing as well as a method of forming coating films using said composition.

Abstract: The present invention relates to a water-based coating composition suited for surface treatment of the metal sheets or plates to be used in building materials, household electric appliances, automobiles and so forth. The object of the present invention is to provide a water-based coating composition for the steel or metal coated steel surface treatment which gives coating films firmly adhering to metal plates and showing a high degree of hardening as well as excellent corrosion resistance, water resistance and weldability upon baking under low-temperature short-period conditions, has electric conductivity suited for electrodeposition coating and provides lubricating property in processing to thereby prevent powdering during processing as well as a method of forming coating films using said composition.

Abstract: The object of the present invention is reuse of the filtrate of a paint mist-cleaning water mixture as cleaning water without reduction in concentration efficiency. According to the present invention, a waste paint-cleaning water mixture 2 available on trapping a water-based paint mist in cleaning water 1 is concentrated to recover the paint and the aqueous phase is recycled as cleaning water. In this system, the cleaning water prepared by reusing the aqueous phase is adjusted to an acid value of not greater than 10 and a pH value of 7.0 to 9.0. Controlling the amount of low molecular acid components in the aqueous phase in this manner prevents an abnormal viscosity increase in the filtration-concentration of the waste paint-cleaning water mixture.

Abstract: Disclosed is a corrosion preventive coating composition comprising;(1) a corrosion preventive pigment which has a pH value of from 5 to 9, consisting essentially of(a) a specific phosphorus compound which generates phosphate ions in the presence of water, and(b) a specific vanadium compound which generates vanadate ions in the presence of water and oxygen, and(2) a film forming resin selected from the group consisting of maleic acid modified oils, epoxy resins, modified epoxy resins, alkyd resins, acryl resins, melamine resins, urea resins, blocked isocyanate resins, maleic acid modified polybutadiene resins, polyvinyl butylal, polyvinylalcohol, silicate esters, silicone resins, silicates and chlorinated rubber; said pigment being present in an amount of 0.1 to 50 parts by weight based on 100 parts by weight of a solid content of said coating composition.

Abstract: Disclosed is a corrosion preventive pigment consisting essentially of(a) a phosphorus compound which generates phosphate ions in the presence of water and oxygen, selected from the group consisting of a phosphorous pentoxide, an orthophosphoric acid, a condensed phosphoric acid, and alkaline earth metal or transition metal phosphate, or an alkaline earth metal or transition metal condensed phosphate, and(b) a vanadium compound which generates a vanadate ion in the presence of water and oxygen, selected from the group consisting of vanadium (V) oxide, a vanadyl compound, an alkaline earth metal or transition metal vanadate, a baked condensate of alkaline earth metal or transition metal vanadates, or a heterocondensate of alkaline earth metal or transition metal vanadates;and which has a pH value of from 5 to 9.

Abstract: Disclosed is a metal particle having a maximum dimension of not more than 1 mm surface-treated with an aqueous solution containing phosphate ions, soluble ions of vanadium and oxygen. This particle can be a metallic pigment having excellent brightness retention and wetting properties to a binder resin.

Abstract: There is herein provided a coating composition for controlling hydrogen embrittlement of a steel which contains 1 to 500 percent by weight of a metal oxide selected from the group consisting of manganese dioxide, vanadium pentoxide and molybdenum trioxide based on 100 percent by weight of resin solids.

Abstract: A phosphate coating solution for forming coatings on a metal surface is contacted with an anion-exchanger loaded or contacted with nitrite ions, whereby the nitrate ions present in the coating solution are replaced by the nitrite ions. This process permits continued operation of a phosphate coating process without replenishing a nitrite solution. This process also allows no accumulation of alkali metal and/or ammonium ions unavailable for the phosphate coating and provides uniform coatings with satisfactory coating properties on the metal surface.