AU709658B2 - Aqueous dispersions of transparent powder coating - Google Patents

Aqueous dispersions of transparent powder coating Download PDF

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Publication number
AU709658B2
AU709658B2 AU53992/96A AU5399296A AU709658B2 AU 709658 B2 AU709658 B2 AU 709658B2 AU 53992/96 A AU53992/96 A AU 53992/96A AU 5399296 A AU5399296 A AU 5399296A AU 709658 B2 AU709658 B2 AU 709658B2
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Prior art keywords
powder coating
aqueous dispersion
transparent powder
component
agents
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AU53992/96A
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AU5399296A (en
Inventor
Peter Clark
Lawrence Sacharski
Joachim Woltering
Heinrich Wonnemann
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BASF Coatings GmbH
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BASF Coatings GmbH
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/062—Copolymers with monomers not covered by C09D133/06
    • C09D133/068—Copolymers with monomers not covered by C09D133/06 containing glycidyl groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
    • C08G59/32—Epoxy compounds containing three or more epoxy groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention concerns an aqueous dispersion of a transparent coating powder, the dispersion consisting of a solid, powder-form component (A) and an aqueous component (B). Component A is a transparent coating powder containing a) at least one epoxy-containing binder having from 30 to 45 %, preferably 30 to 35 %, of glucidyl-containing monomers optionally containing vinyl aromatic compounds, preferably styrene, b) at least one cross-linking agent, preferably staight-chain, aliphatic dicarboxylic acids and/or carboxy-function polyesters, and optionally c) catalysts, auxiliaries and additives typical of coating powders such as degassing agents, flow agents, UV absorbers, radical-capture agents and anti-oxidants. Component B is an aqueous dispersion containing a) at least one non-ionic thickening agent, preferably a non-ionic associative thickener, and optionally b) catalysts, auxiliaries, anti-foaming agents, dispersing agents, wetting agents, preferably carboxy-function dispersing agents, anti-oxidants, UV absorbers, radical-capture agents, biocides and small amounts of solvents and/or water-retention agents. The invention also concerns a method of manufacturing a dispersion of this kind and its use on automobile bodywork.

Description

2 In the text which follows, the terms transparent powder coating dispersion and powder clearcoat are used synonymously.
It is an object of the present invention to provide an aqueous dispersion of a transparent powder coating, which may be applied to vehicle bodies by means of the conventional liquid-coating technology and which may particularly be baked even at temperatures of 130 0
C.
According to the present invention there is provided an aqueous dispersion of a transparent powder coating, including a solid powder component A and an aqueous component B, wherein component A is a transparent powder coating comprising at least one epoxy group-containing binder having a content of glycidyl-containing monomers of from 30 to at least one crosslinking agent; and 25 component B in an aqueous dispersion comprising at least one nonionic thickener.
*o* *e *•g H:\valerie\Keep\Speci\53992.96.JMC.doc 3/06/99 The epoxy-functional binder for the solid transparent powder coating used for the preparation of the dispersion comprises, for example, epoxy group-containing polyacrylate resins which are preparable by copolymerisation of at least one ethylenically unsaturated monomer containing at least one epoxy group within the molecule and at least one further ethylenically unsaturated monomer containing no epoxy group within the molecule, at least one of the monomers being an ester of acrylic acid or methacrylic acid. Such epoxy groupcontaining polacrylate resins are, for example, known from EP- A-299 420; DE-B-22 14 650; DE-B-27 49 576; US-A-4,091,048 and US-A 3,781,379.
Examples of ethylenically unsaturated monomers containing no epoxy group within the molecule are alkyl esters of acrylic acid and methacrylic acid containing 1 to 20 carbon atoms in the alkyl radical, particularly methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate and 2-ethylhexyl methacrylate. Further examples of ethylenically unsaturated monomers containing no epoxy groups within the molecule are acid amides, for example acrylamide and methacrylamide, vinylaromatic compounds, such as styrene, methylstyrene and vinyltoluene, nitriles, such as acrylonitrile and methacrylonitrile, vinyl halides and vinylidene halides, such as vinyl chloride and vinylidene fluoride, vinyl esters, for example vinyl acetate, and hydroxyl-containing monomers, for example hydroxyethyl acrylate and hydroxyethyl methacrylate.
The epoxy group-containing polyacrylate resin usually has an epoxy equivalent weight of from 400 to 2500, preferably from 420 to 700, a number-average molecular weight of from 2000 to 20,000, preferably from 3000 to 10,000 (determined by gel permeation chromatography using a polystyrene standard) and a glass transition temperature (TG) of from 30 to 80 0
C,
preferably from 40 to 70 0 C, more preferably from 40 to 600C (measured using differential scanning calorimetry
(DSC)).
About 50 0 C is most preferred. Blends of two or more acrylate resins may also be employed.
The epoxy group-containing polyacrylate resin may be prepared in accordance with generally well-known methods by polymerisation.
Suitable crosslinking agents are carboxylic acids, in particular saturated straight-chain aliphatic dicarboxylic acids having 3 to 20 carbon atoms within the molecule. Most preferably, dodecane-1,12-dicarboxylic acid is used. In order to modify the properties of the final transparent powder coatings, other carboxyl-containing crosslinking agents may optionally be employed. As examples of such crosslinking agents there may be mentioned saturated branched or unsaturated straight-chain dicarboxylic acids and polycarboxylic acids as well as polymers having carboxyl groups.
Additionally, transparent powder coatings are suitable which contain an epoxy-functional crosslinking agent and an acidfunctional binder.
As the acid-functional binder, suitable examples are acidic polyacrylate resins, which are preparable by copolymerizing at least one ethylenically unsaturated monomer containing at least one acid group within the molecule with at least one further ethylenically unsaturated monomer containing no acid group within the molecule.
The epoxy group-containing binder and the epoxy groupcontaining crosslinking agent, respectively, and the carboxylcontaining binder and the carboxyl-containing crosslinking agent, respectively, are usually employed in an amount such that there are 0.5 to 1.5 equivalents, preferably 0.75 to 1.25 equivalents, of carboxyl groups per equivalent of epoxy groups. The amount of carboxyl groups present may be determined by titration with an alcoholic KOH solution.
In accordance with the invention, the binder contains vinylaromatic compounds, particularly styrene. In order to limit the danger of fissure formation, the content is not, however, more than 35 by weight. 10 to 25 by weight is preferred.
The solid powder coatings optionally contain one or more catalysts suitable for epoxy resin curing. Suitable catalysts are phosphonium salts of organic or inorganic acids, quaternary ammonium compounds, amines, imidazole and imidazole derivatives. The catalysts are generally employed in amounts of from 0.001 by weight to about 2 by weight, based on the total weight of the epoxy resin and the cross-linking agent.
Examples of suitable phosphonium catalysts are ethyltriphenylphosphonium iodide, ethyltriphenylphosphonium chloride, ethyltriphenylphosphonium thiocyanate, complex of ethyltriphenylphosphonium acetate and acetic acid, tetrabutylphosphonium iodide, tetrabutylphosphonium bromide and complex of tetrabutylphosphonium acetate and acetic acid. These and other suitable phosphonium catalysts are, for example, described in US-A 3,477,990 and US-A 3,341,580.
Suitable imidazole catalysts are, for example, 2-styrylimidazole, l-benzyl-2-methylimidazole, 2-methylimidazole and 2 -butylimidazole. These and other imidazole catalysts are, for example, described in the Belgian Patent No. 756,693.
In addition, the solid powder coatings may optionally contain adjuvants and additives. These are exemplified by levelling agents, antioxidants, UV absorbers, radical scavengers, flow aids and deaerating agents, such as benzoin.
The solid powder coatings are prepared by known methods (see, for example, product information by the company BASF Lacke Farben AG, "Pulverlacke", 1990) by homogenizing and dispersing, for example by means of an extruder, screw-type kneading machine and the like. After their preparation, the powder coatings are prepared for the dispersion operation by milling and optionally by sifting and screening.
The aqueous dispersion of the transparent powder coating can subsequently be prepared from the powder by wet milling or by introduction of dry-milled powder coating material, with stirring. Wet milling is particularly preferred.
The present invention also relates, accordingly, to a process for preparing an aqueous dispersion of a powder coating on the basis of the component A as described above, which is, in accordance with the invention, dispersed in a component B. The latter consists of an aqueous dispersion of catalysts, adjuvants, antifoams, antioxidants, wetting agents,
UV
absorbers, radical scavengers, biocides, water retaining agents, small amounts of solvents and/or dispersion adjuvants, preferably carboxy-functional dispersion adjuvants.
As a further essential constituent, the aqueous component B of the powder coating dispersion contains at least one nonionic thickener Preference is given to the use of nonionic associative thickeners a).
Structural features of such associative thickeners a) are: aa) a hydrophilic structure which ensures adequate solubility in water, and ab) hydrophobic groups, which are capable of associative interaction in the aqueous medium.
Examples of hydrophobic groups employed are long-chain alkyl radicals, for example dodecyl, hexadecyl or octadecyl radicals, or alkaryl radicals, for example octylphenyl or nonylphenyl radicals.
Hydrophilic structures preferably employed are polyacrylates, cellulose ethers or, with particular preference, polyurethanes, which contain the hydrophobic groups as polymer units.
Hydrophilic structures which are most preferred are polyurethanes containing polyether chains as structural units, preferably comprising polyethylene oxide. In the synthesis of such polyetherpolyurethanes, the di- and/or polyisocyanates, preferably aliphatic diisocyanates, most preferably unsubstituted or alkyl-substituted 1,6-hexamethylene diisocyanate, are used to link the hydroxyl-terminated polyether units to one another and to link the polyether units with the hydrophobic end-group units, which may for example be monofunctional alcohols and/or amines bearing the long-chain alkyl radicals or aralkyl radicals already mentioned.
Following the dispersion of component A in component
B,
milling is carried out optionally, the pH is adjusted to from to 7.0, preferably from 5.5 to 6.5, and the mixture is filtered.
The mean particle size is between 1 and 25 tm, preferably below 20 Am, particularly preferably from 3 to 10 im. The solids content of the aqueous dispersion of the transparent powder coating is between 15 and 50 Before or after the wet milling or the incorporation of the dry powder coating into the water, there may be added to the dispersion from 0 to 5 by weight of a blend of defoamers, of an ammonium and/or alkali metal salt, of a carboxy-functional or nonionic dispersion adjuvant, of a wetting agent and/or of a thickener mixture as well as of the other additives above.
Preferably, in accordance with the invention, defoamer, dispersion adjuvant, wetting agent and/or thickener are dispersed in water first. Then small portions of the transparent powder coating are stirred in. Then defoamer, dispersion adjuvant, thickener and wetting agent are dispersed into the mixture once again. Finally, small portions of the transparent powder coatings are stirred in again.
In accordance with the invention, the pH is preferably adjusted using ammonia or amines. The pH here may initially increase, so that a strongly basic dispersion is formed.
Within several hours or days, however, the pH falls again to the above-indicated values.
The dispersion of the transparent powder coating according to the invention may be used as a coating over basecoats preferably in the automotive industry. The clearcoat dispersion is particularly suitable for water-based coating materials based on a polyester, polyurethane resin and an amino resin.
The dispersions of the transparent powder coating according to the invention may be applied by the methods known from the liquid-coating technology. In particular, the dispersions may be applied by means of spray coating methods. However, electrostatically assisted high-speed rotation or pneumatic application are also suitable.
The dispersions of the transparent powder coating are, after application to the basecoat, usually flashed off before baking. This is appropriately done at room temperature first and then at slightly elevated temperature. Usually, the elevated temperature is from 40 to 70 0 C, preferably 50 to 0 C. The flashoff is carried out for from 2 to 10 minutes, preferably 4 to 8 minutes, at room temperature. Flashing off is carried out again for the same period of time at elevated temperature.
The baking step may even be carried out at temperatures of 1300C. Baking may be carried out at 130 to 1800C, preferably at 135 to 155 0
C.
With the process according to the invention it is possible to obtain coats having a thickness of 30 to 50 Am, preferably from 35 to 45 Am. In accordance with the prior art, clearcoats of comparable quality could be obtained only by applying coats having a thickness of 65 to 80 Am when employing transparent powder coatings.
The invention is described in more detail below with reference to the examples: 1. Preparation of the acrylate resin 21.1 parts of xylene are fed into a vessel and heated to 1300C. At 1300C there are added, within a period of 4 h, via two separate feed vessels; initiator: 4.5 parts of TBPEH (tert-butyl perethylhexanoate) in a mixture with 4.86 parts of xylene; and monomers: 10.78 parts of methyl methacrylate, 25.5 parts of n-butyl methacrylate, 17.39 parts of styrene and 23.95 parts of glycidyl methacrylate. The mixture is then heated to 180 0 C, and the solvent is stripped off under a reduced pressure 100 mbar.
2. Preparation of the transparent powder coating 77.5 parts of acrylate resin, 18.8 parts of dodecane dicarboxylic acid (acidic hardener), 2 parts of Tinuvin 1130 (UV absorber), 0.9 parts of Tinuvin 144 (HALS), 0.4 parts of Additol XL 490 (levelling agent) and 0.4 parts of benzoin (deaerating agent) are mixed intimately on a Henschel fluid mixer, and the mixture is extruded in a BUSS PLK 46 extruder, milled in a Hosohawa ACM 2 mill and screened by means of a 125 Am sieve.
3. Preparation of the dispersion In 400 parts of demineralized water, there are dispersed 0.6 parts of Troykyd D777 (defoamer), 0.6 parts of Orotan 731 K (dispersion adjuvant), 0.06 parts of Surfinol TMN 6 (wetting agent) and 16.5 parts of RM8 (Rohm Haas, nonionic, associative, polyurethane-based thickener).
Thereafter, 94 parts of the transparent powder coating are stirred in in small portions. A further 0.6 parts of Troykyd D777, 0.6 parts of Orotan 731 K, 0.06 parts of Surfinol TMN 6 and 16.5 parts of RM8 are dispersed into the mixture. Finally, 49 parts of the transparent powder coating are stirred in in small portions. The material is milled in a sand mill for 3.5 h. The average particle size finally measured is 4 tm. The material is filtered through a 50 Am filter and, finally, 0.05 Byk 345 (levelling agent) is added.
4. Application of the dispersion By means of a bowl-type spray gun, the slurry is applied to steel panels coated with a water-based basecoat. The metal panel is flashed off for 5 minutes at room temperature and for 5 minutes at 60C. Thereafter, the panel is baked for 30 minutes at a temperature of 1400C.
A high-gloss clearcoat film with a coat thickness of Am is produced which has MEK resistance 100 double strokes) The clearcoat film possesses good resistance to condensation.
11 THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS: 1. An aqueous dispersion of a transparent powder coating, including a solid powder component A and an aqueous component B, wherein component A is a transparent powder coating comprising at least one epoxy group-containing binder having a content of glycidyl-containing monomers of from to at least one crosslinking agent; and component B is an aqueous dispersion comprising at least one nonionic thickener.
2. An aqueous dispersion of a transparent powder coating according to claim 1 in which the at least one epoxy group-containing binder has a content of glycidylcontaining monomers of from 30 to 25 3. An aqueous dispersion of a transparent powder coating according to claim 1 or 2 in which component A further includes a vinyl aromatic compound.
9 4. An aqueous dispersion of a transparent coating 30 according to claim 3 in which the vinyl aromatic compound is styrene.
5. An aqueous dispersion of a transparent coating according to any preceding claim in which the 35 crosslinking agent is a straight chain aliphatic dicarboxylic acid and/or a carboxy-functional polyester.
H:\valerie\Keep\Speci\539926.JMC.doc 3/06/99

Claims (25)

  1. 6. An aqueous dispersion of a transparent powder coating according to any preceding claim further including catalysts, adjuvants or additives typical for addition to transparent powder coatings.
  2. 7. An aqueous dispersion of a transparent powder coating according to claim 6 in which the additives typical for transparent powder coatings include deaerating agents, levelling agents, UV absorbers, radical scavengers or antioxidants.
  3. 8. An aqueous dispersion of a transparent powder coating according to any preceding claim in which component B further includes catalysts, adjuvants, defoamers, wetting agents, dispersion adjuvants, anti-oxidants, UV absorbers, radical scavengers, biocides, small amounts of solvents, levelling agents, neutralizing agents and/or water retaining agents.
  4. 9. An aqueous dispersion of a transparent powder coating according to claim 8 in which the dispersion adjuvants are carboxy-functional dispersers. 25 10. An aqueous dispersion of a transparent powder coating according to claim 8 or 9 in which the neutralising agents are amines. a. a
  5. 11. An aqueous dispersion of a transparent powder coating 30 according to any preceding claim, having a pH between 4.0 and oe
  6. 12. An aqueous dispersion of a transparent powder coating according to claim 11 in which the pH is between 35 and
  7. 13. An aqueous dispersion of a transparent powder coating H:\valerie\Keep\Seci\53992.96.JMCdoc 3/06/99 13 according to any preceding claim in which the amount of vinylaromatic compound is at most 35% by weight based on the weight of component Aa.
  8. 14. An aqueous dispersion of a transparent powder coating according to claim 13 in which the amount of vinyl- aromatic compounds is 10-25 by weight based on the weight of component Aa).
  9. 15. An aqueous dispersion of a transparent powder coating according to any preceding claim, wherein the epoxy- functional binders are epoxy group-containing polyacrylate resins and where the epoxy-functional monomers are glycidyl acrylate, glycidyl methacrylate or allyl glycidyl ether. V V .*r V V 0* C
  10. 16. An aqueous dispersion of a transparent powder coating according to any preceding claim, wherein the particle size is at most 20 pm.
  11. 17. An aqueous dispersion of a transparent powder coating according to claim 16 wherein the particle size is from 3 to 10 im.
  12. 18. An aqueous dispersion of a transparent powder coating according to any preceding claim wherein component B includes as nonionic thickener a) at least one nonionic associative thickener containing as structural features: 30 aa) hydrophilic groups and ab) hydrophobic groups which are capable of forming associative interactions with each other or with hydrophobic surfaces of solid paint components.
  13. 19. An aqueous dispersion of a transparent powder coating according to claim 18, wherein the nonionic associative thickener a) contains polyurethane chains H:\valerie\Keep\Speci\53992.96.JMC.doc 3/06/99 14 as the hydrophilic groups aa). An aqueous dispersion of a transparent powder coating according to claim 19, wherein the nonionic associative thickener a) includes polyurethane chains with polyether units as the hydrophilic groups aa).
  14. 21. A process for preparing the aqueous dispersion of a transparent powder coating according to one of claims 1 20, which comprises I. preparing a dispersion from a solid, powder component A and an aqueous component B, where component A is a transparent powder coating comprising at least one epoxy group-containing binder having a content of glycidyl-containing monomers of from 30 to at least one crosslinking agent and component B is an aqueous dispersion 25 comprising 0* A. at least one nonionic thickener. 6@ II. optionally milling the dispersion prepared from components A and B, III. adjusting the pH of the dispersion to from 4.0 to S 35 22. A process for preparing the aqueous dispersion of a transparent powder coating according to claim 21 in which H:\valerie\Keep\Speci\53992.96.,JMC.doc 3/06/99 15 at least one epoxy group-containing binder has a content of glycidyl containing monomers of from to
  15. 23. A process for preparing the aqueous dispersion of a transparent powder coating according to claim 21 or 22 in which component A further includes a vinyl aromatic compound.
  16. 24. A process for preparing the aqueous dispersion of a transparent powder coating according to claim 23 in which the vinyl aromatic compound is styrene.
  17. 25. A process for preparing the aqueous dispersion of a transparent powder coating according to any one of claims 21 to 24 in which the crosslinking agent is a straight-chain aliphatic dicarboxylic acid and/or a carboxy-functional polyester.
  18. 26. A process for preparing the aqueous dispersion of a transparent powder coating according to any one of claims 21 to 25 in which component A further includes 25 catalysts, adjuvants or additives typical for addition to transparent powder coatings.
  19. 27. A process for preparing an aqueous dispersion of a transparent powder coating according to claim 26 in 30 which the additives are deaerating agents, levelling agents, UV absorbers, radical scavengers or antioxidants.
  20. 28. A process for preparing an aqueous dispersion of a 35 transparent powder coating according to any one of claims 21 to 27 in which component B further includes catalysts, adjuvants, defoamers, dispersion adjuvants, H:\valerie\Keep\Speci\53992.96.JMC.doc 3/06/99 16 wetting agents, antioxidants, Uv absorbers, levelling adjuvants, neutralising agents, radical scavengers, small amounts of solvent, biocides and/or water retaining agents.
  21. 29. A process for preparing an aqueous dispersion of a transparent powder coating according to claim 28 in which the dispersion adjuvant includes carboxy- functional disperants. A process for preparing an aqueous dispersion of a transparent powder coating according to claim 28 or 29 in which the neutralising agent is an amine.
  22. 31. A process for preparing an aqueous dispersion of a transparent powder coating according to any one of claims 21 to 30 including adjusting the pH of the dispersion to from 5.5 to
  23. 32. The process according to any one of claims 21 to 31 wherein the aqueous dispersion of the transparent powder coating is prepared from the components A and B by wet milling. a. 9* 25 33. The use of the aqueous dispersion of the transparent powder coating, according to any one of claims 1 to 20, for coating painted and unpainted vehicle bodies made of sheet metal and/or plastic by means of electrostatically assisted high-speed rotation or 30 pneumatic application.
  24. 34. An aqueous dispersion of a transparent powder coating, including a solid powder component A and an aqueous component B substantially as herein described with reference to the accompanying examples. A process for preparing an aqueous dispersion of a H:\valerie\Keep\Speci\53992 96.JMCdoc 3/06/99 17 transparent powder coating substantially as herein described with reference to the accompanying examples.
  25. 36. The use of an aqueous dispersion of a transparent powder coating substantially as herein described with reference to the accompanying examples. Dated this 3rd day of June 1999 BASF LACKE FARBEN AKTIENGESELLSCHAFT By their Patent Attorneys GRIFFITH HACK Fellows Institute of Patent and Trade Mark Attorneys of Australia e e H:\valerie\Keep\Speci\53992.96.JMC.doc 3/06/99 Abstract: The present invention relates to an aqueous dispersion of a transparent powder coating, consisting of a solid powder component A and an aqueous component B, wherein component A is a transparent powder coating comprising at least one epoxy group-containing binder having a content of glycidyl-containing monomers of from 30 to preferably from 30 to 35 and optionally having a content of vinylaromatic compounds, preferably styrene; at least one crosslinking agent, preferably straight- chain aliphatic dicarboxylic acids and/or carboxy- functional polyesters; and optionally catalysts, adjuvants, additives typical for transparent powder coatings, such as deaerating agents, levelling agents, UV absorbers, radical scavengers and antioxidants; and component B is an aqueous dispersion comprising at least one nonionic thickener, preferably a nonionic associative thickener, and optionally catalysts, adjuvants, defoamers, dispersion adjuvants, wetting agents, preferably carboxy-functional dispersants, antioxidants, UV absorbers, radical scavengers, biocides, small amounts of solvents and/or water retaining agents. A further subject of the application is a process for pre- paring the dispersion of transparent powder coating, and its use for vehicle bodies.
AU53992/96A 1995-04-10 1996-04-04 Aqueous dispersions of transparent powder coating Ceased AU709658B2 (en)

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Application Number Priority Date Filing Date Title
US41929695A 1995-04-10 1995-04-10
US08/419296 1995-04-10
PCT/EP1996/001480 WO1996032452A1 (en) 1995-04-10 1996-04-04 Aqueous dispersion of a transparent coating powder

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AU5399296A AU5399296A (en) 1996-10-30
AU709658B2 true AU709658B2 (en) 1999-09-02

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CN (1) CN1181101A (en)
AT (1) ATE181951T1 (en)
AU (1) AU709658B2 (en)
BR (1) BR9604948A (en)
CA (1) CA2216111C (en)
DE (2) DE19613547C3 (en)
ES (1) ES2136400T5 (en)
SG (1) SG54322A1 (en)
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Publication number Priority date Publication date Assignee Title
ATE212656T1 (en) * 1995-05-19 2002-02-15 Basf Coatings Ag AQUEOUS POWDER COAT DISPERSION
DE19652813A1 (en) 1996-12-18 1998-06-25 Basf Coatings Ag Aqueous powder coating dispersion
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ZA962618B (en) 1996-10-11
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TW313580B (en) 1997-08-21
CA2216111A1 (en) 1996-10-17
CN1181101A (en) 1998-05-06
BR9604948A (en) 1998-06-09
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AU5399296A (en) 1996-10-30
EP0820490B1 (en) 1999-07-07

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