Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-09-30
1994-08-30
Zitomer, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
423DIG14, 525152, 5253265, 5253289, 5253291, 5253303, 5253306, 525380, 525384, 525385, 526312, C08F 832, C08F 2602
Patent
active
053429010
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a novel, film-formable, chelate-forming resin, a process for preparing the same, the use thereof and a method for forming an electrophoretic coating.
BACKGROUND ART
Conventionally metals have been prevented from corrosion, for example, by treating the surface of metals, i.e. by forming an inorganic coating of phosphoric acid salt, chromic acid salt or the like over the metal surface, or by techniques for forming corrosion preventive coatings, i.e. by forming an organic coating of epoxy resin, phenol resin or the like over the metal surface.
However, the treatment of metal surfaces has the drawbacks of causing environmental pollution due to liquid wastes containing heavy metals, using poisonous chemicals such as acids, alkalis or cyano-containing compounds, and necessitating a complex process.
Corrosion preventive coatings have the problem that the bond strength between the coating and the metal is insufficient to completely prevent the corrosion reaction.
Accordingly, corrosion preventive techniques still remain to be established which are free of pollution, practically useful and excellent in corrosion preventive effects, and it has been desired to develop such techniques.
In application of coating on automotive bodies and electrical equipment, it is widely practiced to pretreat the surface of metal with the phosphoric acid salt, followed by application of an electrophoretic coating composition as a primer in view of resistance to corrosion on metal surfaces, adhesion between the metal surface and the coating, finishing appearance of coating, durability thereof, productivity thereof, etc.
In this case, while the electrophoretic coating composition is substantially pollution-free, the treatment with phosphoric acid salt entails the problems that the phosphorus in the liquid waste from the treatment process induces eutrophication of water, thereby polluting the water, and that a short supply of phosphorus is expected in future. Thus there is an urgent need for development of a novel pretreatment method which can replace the treatment with phosphoric acid salt.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a novel film-formable, chelate-forming resin capable of forming a metal chelate complex firmly on the surface of metal to prevent the metal from corrosion, and a process for preparing the same.
Another object of the invention is to provide a novel metal surface treating composition and a novel corrosion preventive coating composition both containing a film-formable, chelate-forming resin which is free of pollution and excellent in corrosion resistance.
A further object of the invention is to provide a novel method for forming an electrophoretic coating which includes pretreatment to be effected prior to coating instead of conventional pretreatment with phosphoric acid salt.
These and other objects of the invention will become more apparent from the following description.
According to the present invention, there is provided a film-formable, chelate-forming resin having, per 1000 g of the resin, about 0.2 to about 3.5 moles of chelate-forming group represented by the formula [1], [2], [3] or [4]: ##STR2## wherein R.sup.1 and R.sup.2 are the same or different and each represents a hydrogen atom, a halogen atom, a nitro group, a nitroso group, a cyano group, a hydrocarbon group having up to 18 carbon atoms, or an alkoxyalkyl group having up to 12 carbon atoms.
The present invention also provides a process for preparing the chelate-forming resin, comprising subjecting to addition reaction (i) a compound having an amino group and represented by the following formula [5], [6], [7] or [8] and (ii) a resin or a compound having a polymerizable double bond to attach the amino group to the polymerizable double bond: ##STR3## wherein R.sup.1 and R.sup.2 are as defined above.
The present invention also provides a metal surface treating composition and a corrosion preventive coating composition both containing the above chelate-formin
REFERENCES:
patent: 3872047 (1975-03-01), Jandourek
patent: 4725568 (1988-02-01), Parker
patent: 5055356 (1991-10-01), Minowa
Kogure Hideo
Kume Masafumi
Murase Heihachi
Kansai Paint Company Limited
Zitomer Fred
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