Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-06-25
1993-12-21
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525453, 525454, 525460, 528 55, 528 56, 528 72, 427216, 427302, 427327, 427340, 4273881, 4273882, 428403, 428407, C08L 7500
Patent
active
052722236
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a composite metal powder composition very useful as a metal powder pigment component for a high grade metallic paint suitable for coating of automobiles, electric home appliances and the like. More specifically, the present invention relates to a novel composite metal powder composition having excellent performance in various characteristics as a pigment component for an aqueous metallic paint.
BACKGROUND ART
Recently, aqueous paints containing only a very small amount of organic solvent or no organic solvent have been increasingly used in the field of paints to save resources and prevent environmental pollution.
Further, a high grade finish which has been conventionally achieved only with a solvent type paint can be achieved with an aqueous paint due to the remarkable technical development of resins for aqueous paints. In a metallic paint containing various metal powder pigments such as an aluminium pigment, however, very few examples of aqueous paints can be practically used. In particular, no example of practically applicable aqueous paints can be found in a metallic paints which can be used for the coating of automobiles and electrical home appliances which require a high grade finish of a coated film and high durability thereof.
One of the reasons of the above mentioned disadvantage is that various metal powder pigments including the aluminium pigment ar liable to erosion in aqueous paints. In particular, when metal powder exists in aqueous paints, metal erosion is caused by water in a pH range of from acidity to basicity based on the nature of various metals, and hydrogen gas is generated accordingly. The hydrogen gas generation is a very serious problem in the paint making process of paint manufacturers and in a coating process used by manufacturers of automobiles and electrical home appliances from the view point of safety. Note that references to the storge stbility of the metal powder pigment in this specification and appended claims pertain to both the erosiveness of a metal powder pigment in an aqueous paint and the erosiveness of a metal powder pigment when it is independently stored without being prepared as a paint.
Although many inventions have been disclosed up to now to improve this storage stability, no practically applicable technologies have been yet established. For example, in order to improve the storage stability of a metallic powder pigment, a method of using a wetting agent such as polyamide, aliphatic amide, fluorine, silicone and the like, is disclosed in U.S. Pat. No. 3,893,254, a method of using a perfluoroalkyl type wetting agent is disclosed in U.S. Pat. No. 3,926,874, and a method of using a fatty acid or a fatty acid alkanol amide with a nonionic wetting agent is disclosed in U.S. Pat. No. 4,138,270. None of these methods, however, exhibits a sufficient effect for improving the storage stability. Furthremore, such methods have a problem in that the metal powder pigment shows a poor wetting property with water.
Further, a method of using caprolactone phosphoric acid ester is disclosed in Japanese Patent Application Kokai (Laid-Open) No. Sho 61 (1986)-298072 for the purpose of improving storage stability by restricting the reaction of a metal powder pigment with water. A method of using octylphenyl dihydrogen phosphate and diethylamine adduct of bis(octylphenyl) hydrogen phosphate is disclosed in Japanese Patent Application Kokai No. Sho 60 (1985)-15466 for the same purpose. A method of using a reaction product of orthophosphoric acid or phosphoric acid monoester with an epoxy compound in an aqueous paint is disclosed in Japanese Patent Application Kokai No. Sho 61 (1986)-47771. A method of using a reaction product of styrene allyl alcohol copolymer, p-tert-amylphenol with orthophosphoric acid or phosphorus pentaoxide as an aqueous paint is disclosed in Japanese Patent Application Kokai No. Sho 61 (1986)-291662. None of these methods, however, can be practically applied because they do not show sufficient improvement. The
REFERENCES:
patent: 3964939 (1976-06-01), Chandross et al.
International Search Report.
Iri Kiyoshi
Suzuki Mikio
Asahi Kasei Metals Limited
Welsh Maurice J.
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