Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-01-17
1997-12-02
Reddick, Judy M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
205 80, 205109, 205147, 205224, 524501, C08L 6100
Patent
active
056937059
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a formulation of a matted electrodeposition coating composition and a method of coating the same and, particulary, it relates to a formulation of a colorless and transparent matted electrodeposition coating composition having resistances to chemicals and to weather and also to a method of coating the same. More particularly, it relates to a formulation of a matted electrodeposition coating composition having resistances to chemicals and to weather wherein a pattern of the design due to fine unevenness and the hue inherent to the thing to be coated are not hidden but only the gloss on the external appearance are lowered.
PRIOR ART
Common matted coating compositions which do not hide the fine pattern and the hue inherent to the thing to be coated are those in which microsilica is dispersed in the coating composition. However, microsilica has a disadvantage that it is inferior in terms of a resistance to chemicals, especially to alkali, does not give a film having a good transparency and affords a deposition of the microsilica onto the thing to be coated in the case of the thing which needs complicated coating operations whereby a difference in luster is resulted depending upon the area to be coated, especially on the upper and lower surfaces. In the meanwhile, a method of dispersing fine particles of organic substances having small specific gravity in a coating composition has been known. For example, a product in which organic fine particles are dispersed in a coating composition as mentioned in Japanese Patent Kokoku No. 8975/76 is practical as a spray coating composition of a common solvent type and a coating composition of a dipping type although it is not suitable as an electrodeposition coating composition. The reason is that the electrophoreticity of said organic fine particles is not taken into consideration at all and accordingly that there is no property of migration in a constant rate when electricity is applied whereby they are detached when rinsed with water. Further, in electrodeposition coating compositions and in coating the same, viscosity of the electrodeposition bath is nearly the same as that of water in view of diffusion of generated Joule's heat and washability with water while, in the case of the organic fine particles mentioned in the above-mentioned patent, there is a disadvantage that the homogeneous dispersibility of said particles in a bath of an electrolyte of such a low viscosity (usually containing 80-95% of water) is poor and further that no consideration is made on exclusion of the solvent which is a cause of lowering the throwing power and of lowering the resistane of a coated film in the electrodeposition coating composition and also on exclusion of the electrolyte other than the essential components for the coating composition.
In order to overcome such disadvantages, an improvement as mentioned in the Japanese Patent Kokai No. 141771/86 was proposed by the present inventors. Said patent has the following advantages.
(1) Changes in gloss upon changes in electrodeposition coating conditions, temperature of the liquid, stirring, voltage, time for applying electricity, polar ratio, etc. are little;
(2) It is easy to make the said synthetic fine particles finer and, due to an ionic action, dispersibility in water is stabilized;
(3) Purification of said synthetic fine particles is easy, invalid current upon the electrodeposition can be prevented and no oleophilic solvent is contained whereupon good throwing power can be maintained; and
(4) The fine particles exhibit a fluidity and are firmly present in a coated film whereupon they are not affected by washing with water.
PROBLEMS TO BE SOLVED BY THE INVENTION
Although the matted coated film prepared as such is very uniform and has a broad operation range in each of steps of electrodeposition, washing with water and baking, there is a tendency that, when the gloss is 20% or less (60.degree.-mirror reflectivity), hue and pattern of the metal undercoat are hidden. Especially w
REFERENCES:
patent: 5200461 (1993-04-01), Tsuchiya et al.
Inoue Shin'ichi
Ishii Shunji
Kubo Akira
Reddick Judy M.
Shinto Paint Co. Ltd.
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