US5057342A
Expired / Lapsed
US
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Methods and apparatus for obtaining a feathered spray when spraying liquids by airless techniques
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1989-03-22
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Granted: 1991-10-15
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Expires: 2009-03-22
Abstract
Abstract The present invention is directed to methods and apparatus for spraying liquid compositions by airless spray techniques which avoid fishtail spray patterns and desirably obtain feathered spray patterns.
Inventors
- 👤 Kenneth L. Hoy
- 👤 Kenneth A. Nielsen
- 👤 Hendrik F. Bok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:40
CPC Classifications
B; B05; B05B; B05B1/00; B05B12/00; B05B12/14; B05B12/1418; B05B7/00; B05B7/24; B05B7/26; B05B7/28; B05B7/32; B05D; B05D1/00; B05D1/02; B05D1/025; C; C09; C09D; C09D7/00; C09D7/20; B05D1/04; B05D2401/00; B05D2401/90
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
112 words
A method of spraying a liquid mixture to obtain a feathered spray which comprises: (a) forming a liquid mixture in a closed system, said liquid mixture comprising: (i) a solids fraction containing at least one component capable of forming a coating on a substrate; (ii) a solvent fraction which is at least partially miscible with the solids fraction; (iii) at least one supercritical fluid in at least an amount which when added to (i) and (ii) is sufficient to form a feathered spray pattern when sprayed; and (b) spraying said liquid mixture by passing it under pressure through an orifice to form droplets having an average diameter of 1 micron or greater.
Claim 2
Independent Claim
112 words
A method of spraying a liquid mixture to obtain a feathered spray which comprises: (a) forming a liquid mixture in a closed system, said liquid mixture comprising: (i) a solids fraction containing at least one component capable of forming a coating on a substrate; (ii) a solvent fraction which is at least partially miscible with the solids fraction; (iii) at least one supercritical fluid in at least an amount which when added to (i) and (ii) is sufficient to form a feathered spray pattern when sprayed; and (b) spraying said liquid mixture by passing it under pressure through an orifice to form droplets having an average diameter of 1 micron or greater.
Claim 3
Dependent Claim
34 words
The method of claim 1, wherein the solids fraction contains at least one polymeric compound which is selected from the group consisting of thermoplastic resins, thermosetting resins, crosslinkable film forming systems, and mixtures thereof.
Claim 4
Dependent Claim
47 words
The method of claim 2, wherein said at least one polymeric compound is selected from the group consisting of enamels, varnishes, lacquers, acrylic resins, vinyl resins, styrenic resins, polyesters, alkyds, polyurethanes, urethanes, epoxies, phenolics, cellulosic esters, amino resins, natural gums, natural resins, and interpolymers and mixtures thereof.
Claim 5
Dependent Claim
33 words
The method of claim 1 in which the solids fraction further comprises pigments, pigment extenders, metallic flakes, fillers, drying agents, anti-foaming agents, anti-skinning agents, wetting agents, ultraviolet absorbers, cross-linking agents, and mixtures thereof.
Claim 6
Dependent Claim
41 words
The method of claim 1, wherein the solvent fraction contains at least one active solvent selected from the group consisting of ketones, esters, ethers, glycol ethers, glycol ether esters, alcohols, aromatic hydrocarbons, aliphatic hydrocarbons, nitroalkanes, unsaturated hydrocarbons, halocarbons, and mixtures thereof.
Claim 7
Dependent Claim
15 words
The method of claim 5, wherein the active solvent includes at least one hydrocarbon solvent.
Claim 8
Dependent Claim
19 words
The method of claim 1 in which the solvent fraction contains up to about 30% by weight of water.
Claim 9
Dependent Claim
18 words
The method of claim 7 in which solvent fraction contains up to about 20% by weight of water.
Claim 10
Dependent Claim
14 words
The method of claim 7 in which the solvent fraction contains a coupling solvent.
Claim 11
Dependent Claim
28 words
The method of claim 9, wherein the coupling solvent is selected from the group consisting of ethylene glycol ethers, propylene glycol ethers, lactams, cyclic ureas, and combinations thereof.
Claim 12
Dependent Claim
57 words
The method of claim 10, wherein the coupling solvent is selected from the group consisting of butoxy ethanol, propoxy ethanol, hexoxy ethanol, isopropoxy 2-propanol, butoxy 2-propanol, propoxy 2-propanol, tertiary butoxy 2-propanol, ethoxy ethanol, butoxy ethoxy ethanol, propoxy ethoxy ethanol, hoxoxy ethoxy ethanol, methoxy ethanol, methoxy 2-propanol, and ethoxy ethoxy ethanol, n-methyl-2-pyrrolidone, dimethyl ethylene urea, and mixtures thereof.
Claim 13
Dependent Claim
16 words
The method of claim 9, wherein the coupling solvent and the active solvent are the same.
Claim 14
Dependent Claim
13 words
The method of claim 1 which is sprayed with supercritical carbon dioxide fluid.
Claim 15
Dependent Claim
13 words
The method of claim 1 which is sprayed with supercritical nitrous oxide fluid.
Claim 16
Dependent Claim
34 words
The method of claim 1 further comprising prior to step (b), heating said liquid mixture to a temperature sufficient to prevent the adverse effect caused by rapid cooling when said liquid mixture is sprayed.
Claim 17
Dependent Claim
32 words
The method of claim 1, wherein the supercritical carbon dioxide fluid is present in an amount of at least about 15 weight % based upon the total weight of the liquid mixture.
Claim 18
Dependent Claim
33 words
The method of claim 1, wherein the supercritical carbon dioxide fluid is present in amounts ranging from about 20 to about 50 weight %, based upon the total weight of the liquid mixture.
Claim 19
Dependent Claim
19 words
The method of claim 1, wherein the orifice size ranges from about 0.004 to about 0.072 inch in diameter.
Claim 20
Dependent Claim
19 words
The method of claim 18, wherein the orifice size ranges from about 0.004 to about 0.025 inch in diameter.
Claim 21
Dependent Claim
19 words
The method of claim 19, wherein the orifice size ranges from about 0.007 to about 0.015 inch in diameter.
Claim 22
Dependent Claim
26 words
The method of claim 1, wherein the spray pressure ranges from about the critical pressure of the supercritical fluid to about 5000 pounds per square inch.
Claim 23
Dependent Claim
17 words
The method of claim 21, wherein the spray pressure is below about 3000 pounds per square inch.
Claim 24
Dependent Claim
27 words
The method of claim 1, further comprising, prior to step (b), promoting turbulent or agitated flow of said liquid mixture to aid atomization of said liquid spray.
Claim 25
Dependent Claim
30 words
The method of claim 1, further comprising utilizing jets of compressed gas to assist formation and atomization of said liquid spray and to modify the shape of said liquid spray.
Claim 26
Dependent Claim
12 words
The method of claim 24, wherein said compressed gas is compressed air.
Claim 27
Dependent Claim
20 words
The method of claim 25, wherein said compressed air has lowered oxygen content to reduce flammability of said liquid spray.
Claim 28
Dependent Claim
13 words
The method of claim 24, wherein said compressed gas is compressed carbon dioxide.
Claim 29
Dependent Claim
24 words
The method of claim 24, wherein said compressed gas is selected from the group consisting of compressed nitrogen, helium, argon, xenon, and mixtures thereof.
Claim 30
Dependent Claim
23 words
The method of claim 24, wherein the pressure of said compressed gas ranges from about 5 to about 80 pounds per square inch.
Claim 31
Dependent Claim
23 words
The method of claim 29, wherein the pressure of said compressed gas ranges from about 5 to about 20 pounds per square inch.
Claim 32
Dependent Claim
33 words
The method of claim 24, wherein said compressed gas is heated to supply heat to the liquid spray to prevent the adverse effect caused by rapid cooling when said liquid mixture is sprayed.
Claim 33
Dependent Claim
18 words
The method of claim 1 in which the liquid mixture is electrically charged by a high electrical voltage.
Claim 34
Dependent Claim
18 words
The method of claim 32, wherein said high electrical voltage ranges from about 30 to about 150 kilovolts.
Claim 35
Independent Claim
65 words
A method of decreasing fishtail in a sprayed liquid coating composition which is capable of forming a coating on a substrate which comprises admixing at least one supercritical fluid with the liquid coating composition in at least an amount sufficient to decrease the fishtail prior to praying it under pressure through an orifice to form droplets having an average diameter of 1 micron or greater.
Claim 36
Independent Claim
65 words
A method of decreasing fishtail in a sprayed liquid coating composition which is capable of forming a coating on a substrate which comprises admixing at least one supercritical fluid with the liquid coating composition in at least an amount sufficient to decrease the fishtail prior to praying it under pressure through an orifice to form droplets having an average diameter of 1 micron or greater.
References Cited (Backward Citations)
US4124528A
Cited
DE2603664A1
Cited
US4189914A
Cited
DE2853066A1
Cited
JPS5584328A
Cited
US4375387A
Cited
JPS58168674A
Cited
JPS5916703A
Cited
US4582731A
Cited
US4734451A
Cited
US4734227A
Cited
US4619735A
Cited
US4737384A
Cited
JPS62152505A
Cited
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