Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1999-06-14
2001-04-03
Gupta, Yogendra (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S245000, C510S255000, C510S258000, C510S265000, C510S420000, C510S421000, C134S002000, C134S040000
Reexamination Certificate
active
06211132
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for simultaneously deburring, degreasing, and cleaning metal surfaces, especially aluminum and aluminum alloy metal surfaces, by mass finishing in the presence of a suitable aqueous liquid composition.
2. Statement of Related Art
Mass finishing is a process of edge and surface finishing a plurality of workpiece components in which the workpiece components are placed together in a container with a plurality of a distinct type of consumable components known as “media”. The latter are usually abrasives, either solid ones or abrasive particles in a matrix of some kind, but may also be constituted of other materials for special purposes. In the type of mass finishing of interest in this specification, a liquid aqueous composition is also used in the same container as the workpieces and the media. After all three components have been introduced into the container, mechanical means are then used to cause relative motion between the media and the workpieces. More details are given in various standard references, such as J. B. Higneft, “Mass Finishing”,
Metal Finishing,
53
rd Guidebook
-
Directory Issue
1985 (Metals and Plastics Publications, Inc., Hackensack, N.J., 1985), pp. 77-98.
DESCRIPTION OF THE INVENTION
Object of the Invention
A major object of the invention is to provide an aqueous liquid composition and process that, when used in mass finishing, particularly of aluminum and aluminum alloy workpieces, will achieve at least one of the following improvements over current mass finishing processes: better degreasing; better cleaning of other types of soils from the surfaces; better deburring, and brighter (i.e., more reflective) and/or smoother surface finishes of the workpieces, with the word “better” being understood to include any or all of (i) obtaining equal workpiece surface quality in a shorter time, (ii) better workpiece surface quality, and (iii) improved process results not directly related to workpiece quality, such as lower foaming and lower levels of polluting byproducts. Other concurrent or alternative objects are to provide a more economical process and/or a process requiring less expensive equipment for operation on a large scale.
General Principles of Description
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 numerical limits stated is generally preferred. Also, unless expressly stated to the contrary: percents, “parts of”, fractions, ratio values, and the like are by weight; the term “polymer” includes “oligomer”, “copolymer”, “terpolymer”, and the like; 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 electrically neutral constituents in chemical terms refers to the constituents at the time of addition to any combination specified in the description and/or at the time of formation within such a combination by known chemical reactions as specified in the description, and does not necessarily preclude other 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.
Also, unless the context requires otherwise to be sensible or there is an express contrary indication, such as the use of the qualifier “pure” or the like, the term “aluminum” when used hereinafter to describe a substrate being treated by or suitable to be treated by a process according to this invention is to be understood to include pure aluminum and all the alloys of aluminum that contain at least 55% of pure aluminum.
SUMMARY OF THE INVENTION
The working and concentrate metal deburring/degreasing/cleaning compositions of the invention comprise, preferably consist essentially of, or more preferably consist of, water and the following dissolved, stably dispersed, or both dissolved and stably dispersed components:
(A) a surfactant component including at least one member selected from the group consisting of:
(A.1) nonionic surfactant molecules, exclusive of amine oxide molecules, that contain a moiety conforming to the general chemical formula: —(C
m
H
(2m−z)
X
z
O)
v
—, wherein m has the value 2, 3, or 4, preferably 2 or 3, more preferably 2; z represents an integer with a value from 0 to 2m; X represents a halogen atom, and if z has a value of more than 1, may represent the same or a different halogen atom for each X; and v represents a positive integer; and
(A.2) anionic, amphoteric, and both anionic and amphoteric surfactants, exclusive of any previously recited components, that are alkali stable;
(B) a component selected from the group consisting of molecules, exclusive of molecules that are part of component (A), that include a moiety corresponding to general chemical formula I:
where R represents a monovalent aliphatic, preferably straight chain, moiety with the chemical formula —C
n
H
(2n+1−y)
F
y
, wherein n is an integer from 6 to 22, and y is an integer from 0 to (2n+1); and, optionally, one or more of the following components:
(C) a component of pH control agent(s), often alternatively known in the detergent art as “builder(s)”, that are not part of any of the previously recited components;
(D) a component of organic compound(s) that (1) are not part of any of the previously recited components, (2) are liquid at 25° C., and (3) are selected from the group consisting of (3.1) compounds made up of molecules that (3.1.1) contain at least two hydroxyl oxygen atoms and (3.1.2) otherwise contain (3.1.2.1) only carbon and hydrogen and, optionally, halogen atoms, or preferably (3.1.2.2) only carbon and hydrogen atoms; and (3.2) compounds made up of molecules that (3.2.1) contain at least two ether oxygen atoms and (3.2.2) otherwise contain (3.2.2.1) only carbon, hydrogen, hydroxyl oxygen, and/or halogen atoms, or preferably (3.2.2.2) only carbon and hydrogen atoms and, optionally, not more than one hydroxyl oxygen atom; and
(E) a component of hydrotroping agent that is not part of any of the previously recited components;
(F) a component of corrosion inhibitors that are not part of any of the previously recited components; and
(G) a component of sequestering agents that are not part of any of the previously recited components.
In this description, “stably dispersed” means that the component so described can be dispersed by mixing, within one hour of its introduction into the liquid phase in which the component in question is described as stably dispersed, to produce a liquid mixture which has only one bulk phase detectable with unaided normal human vision and does not spontaneously develop any separate bulk phase detectable with normal unaided human vision within 24 hours, or preferably, with increasing preference in the order given, within 7, 30, 60, 90, 120, 180, 240, 300, or 360 days, of storage without mechanical agitation at 25° C. after being initially mixed. (The word “bulk” in the preceding sentence means that, to be considered as a bulk phase, a phase must occupy at least one volume of space that is sufficiently large to be visible with una
Carlson Lawrence R
Pierce John R
Wittke William J
Gupta Yogendra
Harper Stephen D.
Henkel Corporation
Jaeschke Wayne C.
Webb Gregory E.
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