EP0350910A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid spray application of coatings with supercritical fluids as diluents and spraying from an orifice
Assignee: Union Carbide Corp
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Filing: 1989-07-13
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Granted: —
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Expires: 2009-07-13
Abstract
Abstract A liquid coatings application process and apparatus is provided in which supercritical fluids, such as supercritical carbon dioxide fluid, are used to reduce to application consistency viscous coatings compositions to allow for their application as liquid sprays. The coatings compositions are sprayed by passing the composition under pressure through an orifice into the environment of the substrate.
Inventors
- 👤 Kenneth Look Hoy
- 👤 Kenneth Andrew Nielsen
- 👤 Chinsoo Lee
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 10:16
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/02; B05D1/04; B05D1/025; C; C09; C09D; C09D7/00; B05D2401/00; B05D2401/90; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/54
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
60 words
A process for the liquid spray application of coatings to a substrate by spraying under pressure onto a substrate a liquid mixture in a closed system comprising at least one polymeric component capable of forming a coating on a substrate, and a solvent component, containing at least one supercritical fluid through an orifice and curing the coating on the substrate.
Claim 2
Dependent Claim
60 words
A process for the liquid spray application of coatings to a substrate by spraying under pressure onto a substrate a liquid mixture in a closed system comprising at least one polymeric component capable of forming a coating on a substrate, and a solvent component, containing at least one supercritical fluid through an orifice and curing the coating on the substrate.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the orifice size ranges from 0.1 to 1.8 mm, preferably 0.1 to 0.635 mm, especially 0.18 to 0.38 mm in diameter.
Claim 4
Dependent Claim
33 words
The process of claim 1 or 2 wherein the spray pressure ranges from the critical pressure of the supercritical fluid to 345 bar, preferably 73.8 - 207 bar, especially 82.8 - 172.5 bar.
Claim 5
Dependent Claim
32 words
The process of claims 1 to 3 wherein the viscosity of the liquid mixture is less than 300 mPa·s, preferably 5 to 150 mPa·s, especially 10 to 50 mPa·s at spray temperature.
Claim 6
Dependent Claim
32 words
The process of claims 1 to 4 further comprising heating the liquid mixture to a temperature sufficient to prevent the adverse effect caused by rapid cooling when the liquid mixture is sprayed.
Claim 7
Dependent Claim
19 words
The process of claim 5 wherein the liquid temperature ranges from 35°C to 90°C, preferably from 45°C to 75°C.
Claim 8
Dependent Claim
20 words
The process of claims 1 to 6 wherein supercritical fluid comprises supercritical carbon dioxide fluid or supercritical nitrous oxide fluid.
Claim 9
Dependent Claim
28 words
The process of claims 1 to 7 wherein the at least one polymeric component is selected from thermoplastic resins, thermosetting resins, crosslinkable film forming systems, and mixtures thereof.
Claim 10
Dependent Claim
43 words
The process of claim 8 wherein the at least one polymeric component is selected from enamels, varnishes, lacquers, acrylic resins, vinyl resins, styrenic resins, polyesters, alkyds, polyurethanes, urethanes, epoxids, phenolics, cellulosic esters, amino resins, natural gums, natural resins, and interpolymers and mixtures thereof.
Claim 11
Dependent Claim
33 words
The process of claims 1 to 9 the liquid mixtures further comprises pigments, pigment extenders, metallic flakes, fillers, drying agents, antifoaming agents, anti-skinning agents, wetting agents, ultraviolet absorbers, cross-linking agents, and mixtures thereof.
Claim 12
Dependent Claim
21 words
The process of claims 1 to 10 further comprising filtering the liquid mixture to remove particulates that would plug the orifice.
Claim 13
Dependent Claim
24 words
The process of claims 1 to 11 further comprising promoting turbulent or agitated flow of the liquid mixture aid atomization of the liquid spray.
Claim 14
Dependent Claim
32 words
The process of claims 1 to 12 further comprising utilizing jets of compressed gas to assist formation and atomization of the liquid spray and to modify the shape of the liquid spray.
Claim 15
Dependent Claim
54 words
The process of claim 13 wherein the compressed gas is compressed carbon dioxide, preferably in an amount of from 10 to 60 weight percent, of the liquid mixture, or compressed nitrogen, helium, argon, xenon, and mixtures thereof or compressed air, preferably compressed air of lowered oxygen content to reduce flammability of the liquid spray.
Claim 16
Dependent Claim
26 words
The process of claims 13 or 14 wherein the pressure of the compressed gas ranges from 0.345 to 5.52 bar, preferably from 0.345 to 1.38 bar.
Claim 17
Dependent Claim
27 words
The process of claims 13 to 15 wherein the compressed gas is heated and has preferably a temperature from 35°C to 90°C, especially from 45°C to 75°C.
Claim 18
Dependent Claim
29 words
The process of claims 1 to 16 wherein the substrate is selected from metal, wood, glass, plastic, paper, cloth, ceramic, masonry, stone, cement, asphalt, rubber, and composite materials thereof.
Claim 19
Dependent Claim
35 words
The process of claims 1 to 17 wherein the liquid mixture comprises at least one active solvent in which the polymeric component is soluble and which is at least partially miscible with the supercritical fluid.
Claim 20
Dependent Claim
33 words
The process of claim 18 wherein the at least one active solvent is selected from ketones, esters, ethers, glycol ethers, glycol ether esters, alcohols, aromatic hydrocarbons, nitroalkanes, unsaturated hydrocarbons, halocarbons, and mixtures thereof.
Claim 21
Dependent Claim
15 words
The process of claim 19 wherein the solvent component includes at least one hydrocarbon solvent.
Claim 22
Independent Claim
190 words
An apparatus for the liquid spray application of a coating to a substrate according to claims 1 to 20 comprising of, in combination: (a) means for supplying at least one polymeric compound capable of forming a continuous, adherent coating; (b) means for supplying at least one active organic solvent; (c) means for supplying supercritical gas, preferably carbon dioxide fluid; (d) means for forming a liquid mixture of components supplied from (a) - (c); (e) means for spraying the liquid mixture onto a substrate by passing the mixture under pressure through an orifice into the environment of the substrate to form a liquid spray, and optionally (f) means for heating any of the components of the liquid mixture and/or for heating the liquid mixture; (g) means of pressurizing the liquid mixture; (h) means for filtering the liquid mixture; (i) means for promoting turbulent or agitated flow of the liquid mixture to aid atomization of the liquid spray; (j) means for utilizing jets of compressed gas to assist formation and atomization of the liquid spray and to modify the shape of the liquid spray and (k) means for heating the compressed gas.
References Cited (Backward Citations)
No citation records indexed.
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