Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Reexamination Certificate
2001-03-21
2003-09-30
Hruskoci, Peter A. (Department: 1724)
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
C095S152000, C134S038000, C162S189000, C210S727000, C210S728000, C210S734000, C210S735000, C210S917000, C210S928000, C210S930000, C423S122000
Reexamination Certificate
active
06627086
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to the detackification of paints and the clarification of color-containing aqueous systems, and more particularly to the detackification of paints and the clarification of color-containing containing aqueous systems by the use of organic detackifiers.
(2) Description of the Related Art
The commercial application of primers and paints to articles such as vehicles, large appliances, large equipment, and other similar articles, is commonly carried out in paint spraying booths and with the use of automatic paint spraying apparatus. Large quantities of paints are applied at rapid rates and all paint that oversprays or drips from the target finally impacts some part of the paint booth or the painting apparatus, and must eventually be removed and disposed of.
Paint, as that term is used herein, includes a mixture of pigments and a fluid vehicle that provides a coating when applied to an appropriate surface. Paint encompasses a variety of water insoluble organic binder-containing coatings that are commonly applied by spraying operations. High solids, solvent-based base coats and clear coats are included, as are water-borne base and clear coats and solvent-borne and water-borne primers.
Typically, paint overspray is captured by a booth water wash stream which carries the paint to a sump where it is treated with a detackifier to convert it into a non-sticky sludge. The sludge can then be removed and disposed of and the water can be recycled to the spray booth.
Various methods have been reported for treating spray booth waters containing overspray paint, including the addition of compositions containing polymers and amphoteric metal salts which form insoluble hydroxides at pH levels above about 7.0. Such formulations are reported in, for example, U.S. Pat. Nos. 3,861,887, 3,990,986, 4,002,490, 4,130,674, and 4,440,647. U.S. Pat. No. 4,853,132 discloses the use of precipitates formed by the interaction of cationic polymers and inorganic anions to detackify solvent based paints.
U.S. Pat. No. 4,629,572 discloses the treatment of paint booth waste water with a blend of urea or aminotriazine-aldehyde polymers and water swellable clays. Another approach that was taught in U.S. Pat. No. 4,656,059 includes the use of melamine-formaldehyde polymers along with a surfactant (for paint dispersal) and a flocculant. JP 52071538 discloses the use of alum, polyaluminum chloride and calcium hydroxide in combination with polymer accelerators. U.S. Pat. No. 5,240,509 teaches the use of melamine-formaldehyde polymers in conjunction with an aluminum salt at pH values of 6.0 to 9.0.
U.S. Pat. No. 5,639,379 discloses the treatment of waste water effluent containing textile dyes with a permanganate salt, then hydrogen peroxide, followed by an inorganic coagulant (aluminum chlorohydrate) at basic pH and in the presence of an anionic organic coagulant. The clarification of low turbidity waters by the use of aniline-formaldehyde-polyamine polymers formed by a reaction having a formaldehyde:aniline ratio of at least 2, is disclosed in U.S. Pat. No. 4,422,944 to Selvarajan et al.
Mitchell, D. B., and G. A. Tonn, surveyed the use of inorganic and organic paint detackifiers in
Organic Paint Detackifiers and Associated Benefits
, presented at Water-Borne and Higher-Solids, and Powder Coatings Symposium, Feb. 26-28, 1992, New Orleans, La., sponsored by Dept. of Polymer Science, Univ. of Southern Miss., Hattiesburg, Miss., and Southern Society for Coatings Technology, pp. 610-625 (1992). Organic paint detackifiers that were discussed in that paper included mannich tannin, melamine formaldehyde resin, 1,3-phenylelediamine formaldehyde resin, 1,4-phenylelediamine formaldehyde resin, and aniline formaldehyde resin. The relative detackification performance of the last four of these materials was reported to be in the same order as they are listed above. Aniline formaldehyde resin was reported to provide poor detackification on all paint chemistries except two component polyurethanes, and its reduced efficacy compared to melamine formaldehyde resin was attributed to its limited insoluble surface area. No information was apparent regarding the composition of, or for the production or test conditions for any of the resins.
Despite the advances that have been made in the area of paint detackification and effluent water clarification, there remains a need for effective methods that can be used in different types of water treatment systems, such as for both paint detackification and clarification of effluent waters containing dyes, with a minimum amount of change or customization, and without the requirement of a number of additional components or of tedious and time-consuming monitoring and testing; there is also a need for such methods that require only relatively simple and inexpensive compounds; and there is also a need for methods of producing such compounds.
It is to these needs that the present invention is directed.
SUMMARY OF THE INVENTION
Briefly, therefore the present invention is directed to a novel method of clarifying an aqueous liquid comprising contacting the aqueous liquid with an effective amount of a polyarylamine polymer formed by the reaction of less than 2 moles of an aldehyde per mole of arylamine in the presence of an acid in an aqueous solution.
The present invention is also directed to a novel method for detackifying paint in an aqueous suspension comprising intermixing an effective amount of a polyarylamine polymer formed by the reaction of from about 0.5 to about 4 moles of an aldehyde per mole of an arylamine in the presence of an acid in an aqueous solution with the aqueous suspension comprising paint at a pH between about 5 and 14, thereby causing the paint to become detackified.
The present invention is also directed to a novel method for reducing the color content of a highly colored liquid comprising intermixing a highly colored liquid at a pH between about 0.1 and about 14 with an effective amount of a polyarylamine polymer formed by the reaction of from about 0.5 to about 4 moles of an aldehyde per mole of an arylamine in the presence of an acid in an aqueous solution.
The present invention is also directed to a novel composition for detackifying paint in an aqueous suspension comprising an aqueous mixture comprising a flocculant and/or a coagulant and a polyarylamine polymer formed by the reaction of less than 2 moles of an aldehyde per mole of arylamine in the presence of an acid in an aqueous solution.
The present invention is also directed to a novel composition for detackifying paint comprising an aqueous suspension of paint at a pH of greater than about 7, and an amount of a polyarylamine polymer that is sufficient to detackify the paint in the aqueous suspension and wherein the polyarylamine polymer is one that is formed by the reaction of less than 2 moles of an aldehyde per mole of arylamine in the presence of an acid in an aqueous solution.
The present invention is also directed to a novel method of producing a polyarylamine polymer that is suitable for detackifying paint and reducing the color content of highly colored liquids, the method comprising reacting less than 2 moles of aldehyde per mole of an arylamine in the presence of an acid to form a polyarylamine polymer.
The present invention is also directed to a novel method of reducing the color content of a highly colored liquid comprising contacting the liquid with an effective amount of a polyarylamine polymer formed by the reaction of from about 0.5 to about 4 moles of an aldehyde per mole of arylamine in the presence of an acid in an aqueous solution.
Among the several advantages found to be achieved by the present invention, therefore, may be noted the provision of an effective method that can be used in different types of water treatment systems, such as for both paint detackification and clarification of effluent waters containing dyes, with a minimum amount of change or customization; the provision of such methods that can be used witho
Dugan Michael
Mahoney Robert P.
Murphy Christopher B.
Hruskoci Peter A.
Nelson Mullins Riley & Scarborough
Polymer Ventures, Inc.
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