Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Inorganic compound
Reexamination Certificate
1996-05-23
2001-06-19
Lovering, Richard D. (Department: 1712)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Inorganic compound
C508S507000, C252S389200, C252S389400, C252S389540, C252S391000, C524S083000, C524S091000, C106S014120, C106S014160, C106S014170, C106S014420
Reexamination Certificate
active
06248701
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to aqueous liquid compositions suitable for forming a protective coating containing an organic binder material on metal surfaces that are contacted with the compositions, either by direct deposition of a protective film on the metal while the liquid composition is in contact with the metal, or, more commonly, by depositing a liquid film of the liquid composition on the metal and converting this liquid film to a protective solid film by removing water from the initially deposited liquid film and, optionally, heating or otherwise causing the solid constituents of the liquid film to coalesce and/or react, so as to produce an adherent solid film on the metal surface. The solid film thus deposited may be protective against corrosion, damage during cold working of the underlying metal, or the like. The metal surfaces processed as described above may or may not have other surface layers, such as phosphate or chromate conversion coatings, coatings formed by anodization, or the like, underlying the coating produced on the surface by using this invention.
2. Statement of Related Art
Many aqueous liquid compositions that deposit protective coatings on metal surfaces are known. Little prior attention appears to have been paid, however, to the potential of such aqueous liquid compositions for damaging, during treatment, the surfaces that they are intended to protect.
DESCRIPTION OF THE INVENTION
Except in the claims and the operating examples, or where otherwise expressly indicated, all numerical quantities in this description indicating amounts of material or conditions of reaction and/or use are to be understood as modified by the word “about” in describing the broadest scope of the invention. Practice within the umerical limits stated is generally preferred. Also, unless expressly stated to the contrary: percent, “parts of”, and ratio values are by weight; the term “polymer” includes oligomer; the description of a group or class of materials as suitable or preferred for a given purpose in connection with the invention implies that mixtures of any two or more of the members of the group or class are equally suitable or preferred; description of constituents in chemical terms refers to the constituents at the time of addition to any combination specified in the description, and does not necessarILy preclude chemical interactions among the constituents of a mixture once mixed; specification of materials in ionic form implies the presence of sufficient counterions to produce electrical neutrality for the composition as a whole (any counterions thus implicitly specified should preferably be selected from among other constituents explicitly specified in ionic form, to the extent possible; otherwise such counterions may be freely selected, except for avoiding counterions that act adversely to the objects of the invention); and the term “mole” and its variations may be applied to elemental, ionic, and any other chemical species defined by number and type of atoms present, as well as to compounds with well defined molecules.
SUMMARY OF THE INVENTION
It has been found that aqueous liquid compositions intended to provide a protective coating on metal surfaces are often capable of staining or otherwise corroding metal surfaces during the time of treatment. In some case, relatively minor corrosion, often referred to as “etching”, is desirable because it promotes good adhesion of a protective coating to the surface treated. However, gross corrosion of the metal surface during treatment is almost always undesirable, and in many cases, any change in color or texture of the metal surface that is readily detectable visually is undesirable, particularly when the protective coating applied is totally or substantially transparent and/or is applied only for temporary protection and removed before ultimate consumer use of the metal article treated (as would normally be true, for example, of a drawing lubricant), and the aesthetic qualities of the treated metal surface are a substantial desideratum of the final use of the metal supplied with a protective coating according to this invention. Therefore, one object of this invention is to provide aqueous liquid metal coating compositions that have a reduced tendency toward corroding, staining, and/or altering the color or texture of metal surfaces treated with the aqueous liquid metal coating compositions.
Accordingly, one embodiment of the invention is an aqueous liquid composition comprising, preferably consisting essentially of, or more preferably consisting of, water and:
(A) dissolved or dispersed constituents, exclusive of organic azoles but including at least some organic constituents, that are capable of reacting with one another, with a metal surface being treated, or both, or of spontaneously coalescing, or of both reacting and spontaneously coalescing, during or after at least one of (i) contact of the aqueous liquid composition with a metal surface, (ii) separation of a metal surface from such contact, and (iii) removal of water from any liquid film remaining on a metal surface after such contact and subsequent removal from contact of the metal with the aqueous liquid composition, so as to form on the surface of the metal being treated an adherent protective film; said contact of the aqueous liquid composition with the metal surface and said removal of water from any liquid film remaining on the metal after such contact and subsequent removal from contact of the metal with the aqueous liquid composition both occurring at a temperature not less than 20° C.;
(B) a primary inhibitor component selected from the group consisting of non-sulfur-containing organic azole compounds, preferably organic triazoles, more preferably benzotriazole or tolyltriazole; and
(C) a secondary inhibitor component selected from the group consisting of organic azoles that also contain mercapto moieties, preferably mercaptobenzothiazole or mercaptobenzimidazole.
Embodiments of the invention include working aqueous liquid compositions suitable for contacting directly with hetal surfaces to provide protective coatings thereon as described above; liquid or solid concentrates that will form such working aqueous liquid compositions upon dilution with water only; processes of using working aqueous liquid compositions according to the invention as defined above to form protective coatings on metal surfaces; protective solid coatings on metal surfaces formed in such a process, and metal articles bearing such a protective coating; and concentrates comprising, preferably consisting essentially of, or more preferably consisting of components (B) and (C) as described above, and, optionally, also water.
DESCRIPTION OF PREFERRED EMBODIMENTS
The chemical nature and amount of component (A) in a working aqueous liquid composition according to the invention depend on the purpose of the treatment and in general preferably are the same as or similar to the chemical nature and amount of materials used for similar protective purposes in the prior art. Some specific examples particularly suited to the present invention are given below, and any explicit specification herein is to be understood as superseding any contrary teachings from the prior art.
The concentration of component (B) in a working aqueous liquid composition according to this invention preferably is, with increasing preference in the order given, not less than 10, 40, 100, 200, 400, 800, 1200, 1400, 1500, 1600, 1700, 1750, 1800, 1850, 1900, 1925, 1950, or 1975 parts per million (hereinafter often abbreviated “ppm”) of the total composition and independently preferably is, with increasing preference in the order given, not more than 20,000, 10,000, 5000, 3500, 3300, 3100. 2800, 2500, 2400, 2300, 2250, 2200, 2175, 2150, 2125, 2100, 2075, 2050, or 2025 ppm. Chemically, as already noted above, it is preferred for component (B) to be selected from benzotriazole and tolyltriazole, and in fact a mixture of these two is more preferred than either of them alone. The am
Harper Stephen D.
Henkel Corporation
Jaeschke Wayne C.
Jaeschke, Jr. Wayne C.
Lovering Richard D.
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