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
1987-02-17
1988-02-09
Morris, Theodore
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...
C08C 1920
Patent
active
047242493
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to compositions for rust treatment for use on articles made of iron and steel, whether free from oxidation or not, of the kind comprising a dispersion or emulsion of a film-forming agent such as a polymer emulsion together with a chelating agent for chelating iron oxides.
Compositions of this kind have already been proposed, for example in German Offenlegungsschrift No. 25 55 597, Swiss Pat. specification No. 580 152 and British Pat. specification No. 1 494 212. In these prior disclosures gallic acid and tannin, among others, are disclosed as suitable chelating agents for chelating iron oxides.
Pyrogallol (1, 2, 3-trihydroxybenzene) has also been proposed as a chelating agent for chelating iron oxides in such compositions.
It is the aim of this invention to provide a water-based corrosion-inhibiting paint or varnish which, when applied to steel (whether rusted or not), will give a coating capable of substantially preventing further oxidation or corrosion and durable under severe conditions of damp and frost and durable against oil, acid or alkaline or other corrosive environments.
To be effective in practice a corrosion-inhibiting paint or varnish should be compatible with surface coatings in general use. The adhesion and fastness of the varnish film when properly applied should not be less than those of surface coatings in general use and superior in providing a primed surface to allow good finishes to be obtained. The varnish must be of low toxicity and not in itself strongly acid or caustic, not inflammable and must not give off inflammable, explosive or toxic vapours. It must be applicable by painting, spraying or dipping and should cure and dry at ambient temperatures and humidities in a relatively short time.
It has been found that particularly useful film-forming emulsions (or latices) for the purposes of the present invention are those described in the paper by A. J. Burgess, D. Caldwell and J. C. Padget in the Journal of the Oil and Colour Chemists' Association Volume 64, May 1981 pages 175-185, and also in the British Pat. specification No. 1558 411 and European patent application No. 0 030 080 A1. These documents are incorporated herein by reference. Products of the kind there described are sold by Imperial Chemical Industries Ltd as Haloflex 202 and Haloflex 208 ("Haloflex" is a registered Trade Mark).
The invention described and claimed in the aforesaid British patent is an aqueous latex comprising a copolymer derived from (i) vinylidene chloride, (ii) vinyl chloride, (iii) one or more alkyl acrylates having 1 to 12 carbon atoms in the alkyl group and/or one or more alkyl methacrylates having from 2 to 12 carbon atoms in the alkyl group and (iv) one or more aliphatic alpha-beta-unsaturated carboxylic acids, the proportion of vinylidene chloride being from 65 to 90 parts by weight the proportion of the said alkyl acrylates and/or methacrylates being from 2 to 15 parts by weight and the proportion of the said carboxylic acids being from 0.2 to 8 parts by weight, per hundred parts by weight of the total vinylidene chloride and vinyl chloride.
The aforesaid European patent application describes and claims an aqueous latex comprising a copolymer of (i) vinylidene chloride, (ii) vinyl chloride and (iii) one or more alkyl acrylates or alkyl methacrylates having from 1 to 12 carbon atoms in the alkyl group, characterised in that: per hundred parts by weight of total vinylidene chloride and vinyl chloride, weight per hundred parts by weight of total vinylidene chloride, vinyl chloride and the said acrylate(s) and/or methacrylate(s) and than 15 but less than 45 parts by weight per hundred parts by weight of total vinylidene chloride and vinyl chloride.
The present invention therefore in one embodiment provides a corrosion-inhibiting paint or varnish comprising a film-forming latex as defined in the preceding paragraphs together with an effective amount, as chelating agent, of pyrogallol.
The permeability of water varnishes based on this latex was in the order of 1/100 of si
REFERENCES:
patent: 4287298 (1981-09-01), Dodwell
Morris Theodore
Neutra Rust International Limited
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