US2566068A - Corrosion inhibiting compounds - Google Patents

Description

ital initiating ice isd 7U? fit efii Patented Aug. 28, 1951 i Y a 7 containers and wrappings.

UNIT

assaoe's o'onaoslou-rNnmrrlNo COMPOUNDS ration or-Newaer's y No Drawing. Application-January 6,1948,

Serial No. 812

- o i (c1. iota-1.4)

This invention relates to corrosion inhibiting compounds and more particularly to a corrosion inhibiting oil composition presenting substantial fungicidal properties.

"It is well known that when metal objects are shipped to, or stored in, tropical countries, that corrosion of the objects takes place rapidlyf'unless they are protected against the access of air and water. In addition, fungus growth will take place on the objects themselves and ontheir Rusting and fungus growth is particularly undesirable on articles which are designed to come into close contact with the human body, such as razor blades, surgical instruments, scissors, cutlery, etc.

It is an object of our invention to provide a substantially colorless and odorless coating composition which will protect metal articles. against rusting in humid climates over considerable periods of time, which will inhibit fungus growth on the articles and which may be quickly and easily removed when thearticle isready to be used. Other objects and advantages of curinvention will become apparent as the disclosure proceeds.

The essential v requirements of such a coating composition are that it shall be easytd apply to theartiole to be coated; that it shall adhere to all kinds of metal surfaces, both smooth and recessed, with sufficient tenacity to form a can form and continuous coating; that it shall have definite fungicidal qualities; that it shall be chemically stable and not decompose or separate when subjected to extreme weather and temperature conditions; and,of course, that itsh'allbe insoluble in water and unaffected by salt-atmos phere. In' addition, it should be'substantially colorless and odorless so that it will not. stain the outer wrappings of the coated articles, and will not give offense to the user. Itshould' also be easy to remove when desired.

We have discovered a series of compounds that meet all of the foregoing requirements. In general, our new compounds consist of a solution of a mineral oil of selected grade, a corrosion in hibitor, a thickening agent, a fungicide, and a mutual solvent for the fungicide and the mineral oil.

Asa mineral oil, we prefer to use a white oil having a viscosity of 50 to '55 Saybolt seconds at .100' F. in amounts ranging from about 68 per cent t'o97 per cent of the composition. This oil-is quite thin, however, and a thickening agent is: required so that a residualfilm of appreciable thickness will persist after draining. 'Wehave found that our attempts to secure this required body by theuse of a white oil having a viscosity of 325 Saybolt seconds at F; fi-esult'ed in'a product which, in itself, promoted corrosion; A study of the matter indicated that due to the in? creased molecular weight and consequently the complexity of the compounds constituting a heavy white oil, the sulphuric acid treatment used in refining the oil results in the ro'rmauo'n or substances which are'hyartnzea the" presence of water with the lconse quent evolution of 'f re 111- phuric acid. For this reason we prefer to iicrease the viscosity of our compounds by the use 01' a thickening agent. f I

he a thickening'agent we preferto use a poly-' merized poly-iso-butylene having" a molecular weight approximating 60,000 in amounts ranging up to 5 per cent of the composition, or. a solution of approximately equal parts of octyl' and decyl esters of methacrylic acid. polymerized to a molecular weight of approximately 12,000 to 15,000-in petroleum oil. in amounts ranging up to 20' per cent of the composition. While larger amounts of the latter substance are required inorder to attain the desired. viscosity, we have found that it acts as a partial solvent for the fungicides used, and reduces the amount of solvent required for their complete and permanent solution.

As corrosion inhibitors we have found that the presence of minorproportions, from -0.2 per cent to -5 per cent, of a neutraLsoapicfiG-P. dodecylamine-iso-amyl-octyl .acid" ortho phosphate or a cetyl alcohol. derivative of alkoxy maleic anhydride will give excellent anticorro sion qualities to the compound.

We have found that a number of fungicides may be used in our new composition, butwe prefer to use fungicides which are no'ntoi'c'i'c to hum beings Su h a ridy m r u i'ia di' i'sobutyl phenoziy euma etny1uimemyr ammonium chloride, and di isobutyl" creso'iy ethoxy ethyl dime'thylbenzyl' ammonium chloride in amounts ranging from 0.1 per cent to 0.5 per cent by weight of the composition.

As a mutual solvent for the fungicide and mineral oil "we prefernto use ,ethyleneelyccl monobutyl; ether or diethylene; glycol monobutyl ether acetate, in amounts sufllcient to hoidthe fungicide permanently in solutio n generaily from 1 per cent to'5 per cent being suiiicient. As has. been pointed outabove, if po1ymerized methacrylic acid ester is used as a thickening agent, proportionately less mutual solvent is required, since the thickening agent serves as a partial solvent. It has also been found that hydrogenated rosin, in amounts up to 2 per cent, will prove of value as a stabilizing agent, and will also serve to increase the .tackiness of the composition.

Thus, as pointed out above, we have discovered that compositions suitable for the purposes stated may vary in the proportions of their respective 7 components within the following ranges:

. Per cent White oil -68 -97 Polyisobutylene Polymerized octyl and decyl esters of methacrylic acid in petroleum oil solution 0 -201 Corrosion inhibitor 0.2- 5 Fungicide 0.1- 0.5 Mutual solvent 0 5 Hydrogenated rosin 0 2 Having thus described generally our invention, the following examples will serve to instruct those familiar with the art in the mannerand methods of carrying out the same.

Example I Per cent White oil, viscosity 50/55 S. U. S} 'at The hydrogenated rosin in this composition serves to give additional tack to the composition, and also serves as a stabilizer to hold the fungicide in solution. A razor blade coated with this composition after 72 hours at -122-F. and 100 per cent humidity, showed only a trace of rust at the points of-suspension," and no rusting of the blade proper.

-Errample II V Percent White oil, viscosity 50/55 S. USS. at- 100 F. ;...'.2

94.50 Cetyl alcohol derivative of 'alkoxy maleic anhydride 3,00 Poly-iso butylene 1.00 Hydrogenated rosin 2.00 Pyridyl mercuric 'stearate e 0.50

The above composition is an essentially colorless oil which when appliedto a razor blade gave the same protection against rusting as the composition of Example I.

Example III Per cent White oil, viscosity 50/55 S. U. S. at

4 tion to razor blades over a period of 240 hours in the standard humidity cabinet test.

Example IV Ber cent White oil, viscosity /55 S. U. S. at 100 F per cent solution of equal parts of polymerized cetyl and decyl esters of methacrylic acidin petroleum oil 15.00 Neutral soap of C; P. dodecylamine-isoamyl-octyl acid ortho-phosphate 3.00 Di-isobutyl cresoxy ethoxy ethyl dimethyl benzyl ammonium chloride 0.25 Ethylene glycol monobutyl ether 2.00

The above composition is somewhat thicker in consistency than the composition of Example III,

heavier objects than razor blades; such as surgical instruments, etc. This composition also gives excellent protection against'rusting over a period of 240 hours'in the Standard humidity cabinet test. "If

' Example V 7 Per cent White oil, viscosity 50/55 S. U. S. at

F. 83.75 55 per cent solution of equal parts of polymerized octyl and decyl esters of methacrylic acid in petroleum oil 10.00

Nentralisoap.-of c lj dgdecyla mine-isoamyl-octyl acid ortho philiinatefili 3.00 Ethmrmtyf ether 3.00 Di-isobutyl phenoxy ethoxy ethyl dimethyl benzyl ammonium chloride 0.25

This composition is a medium weight oil which will also give excellent antirust protection over a period of 240 hours in the standard humidity cabinet test.

All the above compositions are substantially colorless and odorless oils of excellent covering quality, and possessing film tenacity sufficient to give lasting protection against rusting and fungus growth over considerable periods oftime. They are chemically stable, and the various ingredients will not separate under ordinary (conditions of use. It will be understood, of course, that for uses in which a colorless composition is not necessary, any mineral oil, such as lubricating oils having a viscosity within the'range of the white oil specified above, may be substituted for the white oil. The various compositions may be easily applied, as by dipping, brushing, or spraying, and may be as easily removed by wiping with a dry cloth, or by. holding under running hot water. They are nontoxic, and may be applied with perfect safety to articles such as razor blades, cutlery, surgical instruments, and like articles which are to be used in close proximity to the skin and which may cut or abrade the skin.

Having now described our new compositions, what we claim is:

A fungicidal corrosion inhibiting composition consisting essentially of from about 79.75 per cent to about 94.5 per cent white oil of 50/55 S. U. S. viscosity at 100 F., from 0.20 per cent to 3.00 per cent of a neutral soap of dodecylamine-iso-amyloctyl acid orthophosphate, from 1.00 per cent to 15 per cent of a polymerized iso-butylene havgwy l9 I 1' 11 136 55 L11: EH KUU 2,566,068 5 6 ing a molecular weight of about 60,000, from 0.1 UNITED STATES PATENTS to 0.5 per cent of pyridyl mercuric stearate, from Number Name Date 1 to 5 er cent of ethylene glycol monobutyl ether, 2,085,693 Byme June 29 1937 and hem 0 to 2 per cent hydrogenated rosm. 5 2,122,940 Hudson Ju1y5, 1938 JOHN D. MORGAN. 4 6 Smyers Feb. 8, 1944 RUSSELL LOWE 2,371,851 Smith et a1. Mar. 20, 1945 2,396,192 Morgan et a1 Mar. 5, 1946 REFERENCES CITED The following references are of record in the 10 file of this patent:

OTHER REFERENCES Palnt Manufacture, February 1945, vol. XV. No.

2, page 55.