CA2246480A1 - Multi-stage method of producing aqueous paints for vehicle interiors - Google Patents
Multi-stage method of producing aqueous paints for vehicle interiors Download PDFInfo
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- CA2246480A1 CA2246480A1 CA002246480A CA2246480A CA2246480A1 CA 2246480 A1 CA2246480 A1 CA 2246480A1 CA 002246480 A CA002246480 A CA 002246480A CA 2246480 A CA2246480 A CA 2246480A CA 2246480 A1 CA2246480 A1 CA 2246480A1
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/80—Processes for incorporating ingredients
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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
- C09D133/08—Homopolymers or copolymers of acrylic acid esters
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
Abstract
The invention concerns a multi-stage method of producing aqueous paints (BM) for vehicle interiors. The method proposed calls for the following steps: I) A
mixture (VM) is produced containing the following components: A) a component including at least one base paint (A) containing less than 5 % by wt of water, at least one colour- or effect-producing pigment, an organic solvent, at least one water-dilutable or water-dispersible hydroxy-group-containing resin binder and, optionally, auxiliaries and additives; B) at least one pigment-free aqueous component (B) containing at least one optionally hydroxy-group-containing binder; and C) a solution or dispersion of a di- and/or polyisocyanate (C1) or a mixture of di- and/or polyisocyanates (C1) or, as an alternative to component C), D) an aqueous solution or an aqueous dispersion of a rheological auxiliairy (D1). II) When components C and D are not already included in the mixture (VM) produced in stage (I), the paint (BM) is subsequently produced by adding as component D), an aqueous solution or aqueous dispersion of the rheological auxiliary (D1), or, alternatively as component C), a solution or dispersion of a di- and/or polyisocyanate (C1) or mixture of di- and/or polyisocyanates (C1), to the mixture (VM) and then the viscosity of the paint (BM) adjusted by the addition of deionized water (component E).
mixture (VM) is produced containing the following components: A) a component including at least one base paint (A) containing less than 5 % by wt of water, at least one colour- or effect-producing pigment, an organic solvent, at least one water-dilutable or water-dispersible hydroxy-group-containing resin binder and, optionally, auxiliaries and additives; B) at least one pigment-free aqueous component (B) containing at least one optionally hydroxy-group-containing binder; and C) a solution or dispersion of a di- and/or polyisocyanate (C1) or a mixture of di- and/or polyisocyanates (C1) or, as an alternative to component C), D) an aqueous solution or an aqueous dispersion of a rheological auxiliairy (D1). II) When components C and D are not already included in the mixture (VM) produced in stage (I), the paint (BM) is subsequently produced by adding as component D), an aqueous solution or aqueous dispersion of the rheological auxiliary (D1), or, alternatively as component C), a solution or dispersion of a di- and/or polyisocyanate (C1) or mixture of di- and/or polyisocyanates (C1), to the mixture (VM) and then the viscosity of the paint (BM) adjusted by the addition of deionized water (component E).
Description
PAT 96 595 02.09.1995 BASF Lacke + ~arben Aktiengesellschaft, Munster Process for the preparation of aqueous coating com-positions for the painting of vehicle interiors Field of the invention The invention relates to multistage processes for the preparation of aqueous coating compositions BM for the painting of vehicle interiors, comprising the following stages:
I. preparation of a premix VM including a plgment-containing component A), a binder-containing component B) and a component C) which contains crosslinking agent, or a rheology-controlling component D), and then II. preparation of an aqueous coating composition BM
from the premix VM and the rheology-controlling component D) or the component C) containing crosslinking agent, provided these components are not present in the premix VM, and final estab-lishment of the processing viscosity of the coating composition BM by addition of deionized water as component ~).
Prior art Multicomponent mixer systems on an aqueous basis for production-line autofinishing and/or for the refinish-lng of damage sites, especially for automotiverefinishing, are known.
DE A-42 32 721 describes two-component mixer systems consisting of different base paints, containing less than 5~ by weight of water, at least one color and/or special-effect pigment, organic solvent, optionally auxiliaries and additives, and a water-dilutable blnder, and consisting of a water-containing, pigment-free component. The binders employed in the base paints comprise at least one water-dilutable or water-dispersible acrylicized polyurethane resin and/or at least one water-dilutable or water-dispersible poly-acrylate resin. The mixer systems described in DE A 42 32 721 are preferably employed as aqueous coating compositions for producing a basecoat film After initial drying of the basecoat films produced in this way, an appropriate transparent topcoat com-position is applied. Suitable topcoats include both organically dissolved and aqueous 1- or 2-component clearcoats, and also transparent powder coatings. Use is often made of 2-component clearcoats based on a hydroxyl-containing acrylate copolymer and a polylso-cyanate. Clearcoats of this kind are described, for example, in DE-A-34 12 534, DE-A-36 09 519, DE-A
37 31 552 and DE-A-38 2 3 oos. Suitable 1-component clearcoats, based for example on a hydroxyl-containing binder and an amino resin hardener, are likewise known and are described, for example, in Kittel, Lehrbuch der Lacke und Beschichtungen [Textbook of paints and coatings], Volume IV, Verlag W.A. Colomb in der H.
Heeremann GmbH, Berlin-Oberschwandorf, 1976. In general, after any flashing off period which may be required, the basecoat is dried together with the topcoat.
Object and achievement The requirements in the painting of production-line components or in automotive refinishing are based on the high demands placed on such coatings in terms of mechanical strength, for example against impact or stone chipping, brilliant surface and weathering stability, and are based in turn on the exterior finish of automotive components.
Such requirements necessitate technologically complex multicoat finishes, for example that described above consisting of basecoat film and topcoat film, the application of which is laborious. Automotive interior finishes need satisfy only some of such requirements.
In particular, the stringent requirements placed on mechanical strength, the brilliance of the paint surface and the weathering stability are not as exact-ing as in the case of exterior finishes. In contrast, there are stringent requirements regarding the color uniformity of interior and exterior finish.
The object of the present invention, therefore, was to modify existing coating compositions, prepared, for example, from mixer systems, for the production of basecoat films in the exterior finishing of vehicles in such a way that it is possible for the interior finish-ing of vehicles to use constituents of such mixer systems which insure, in particular, color uniformity, and such that no topcoat films are necessary in the case of interior finishing.
Surprisingly it has been found that aqueous coating compositions BM for the painting of vehicle interiors, which compositions conform outstandingly to the criteria set out in stating the object, can be prepared in a simple manner as follows:
I. a premix VM is prepared consisting of A) different base paints (A) according to DE-A-42 32 721, and comprising less than 5~ by weight of water, at least one color and/or special-effect pigment, organic solvents, and at least one water-dilutable or water-dispersible hydroxyl-containing binder, preferably a water-dilutable or water-dispersible hydroxyl-csntaining polyacrylate resin (A2) having a hydroxyl number of from 5 to 40 mg of KOH/g and/or at least one water-dilutable or water-dispersible hydroxyl-containing, optionally acrylicized polyurethane resin (A1) having a hydroxyl number of from 20 to 100 mg of KOH/g, and of B) at least one aqueous, pigment-free component comprising at least one optionally hydroxyl-containing binder (B1), and of C) a solution or dispersion of a polyisocyanate (Cl) or of a mixture of polyisocyanates (C1) or, alternatively to C), of D) an aqueous solution or dispersion of a rheological auxiliary (D1), and then II. in order to prepare the aqueous coating composition sM, as component D) an aqueous solution or an aqueous dispersion or an aqueous solution [sic] of a rheologi-cal auxiliary (D1) or, alternatively, as component C) asolution or a dispersion of a polyisocyanate (C1) or of a mixture of polyisocyanates (C1) is admixed to the premix VM, provided the respective component C) or D) is not present in the premix VM, and finally the processing viscosity of the aqueous coating composition sM is established by adding deionized water as com-ponent E).
The spray paints produced in this way can be employed for vehicle interior painting without additional application of a topcoat.
The base paints (A) used in component A) are preferably free from water.
The di- and/or polyisocyanates (C') or their mixtures which are employed are preferably isomers or lsomer mixtures of aliphatic and/or cycloaliphatic and/or aromatic di- and/or polyisocyanates in organic or aqueous solution or in organic or aqueous dispersion.
Implementation of the invention Ihe ~ nt~ of the aqueous coating composition BM
Ihe constituents of c _ ~~t A) Component A) of the mixer system can include all customary paint pigments provided that they do not react with water within a short time, for example within the period of time between preparing the aqueous coating compositions BM according to the novel process and the application of the aqueous coating compositions, and that they do not dissolve in water.
This component A) may include special-effect pigments and/or color pigments based on inorganic or organic compounds. In order to insure a scope for use which is as universal as possible and to be able to realize the maximum possible number of shades, it is preferred to construct as component A) a mixer system based on components containing only color pigments and components containing only speclal-effect pigments.
For preparing component A) it is possible to use all special-effect pigments which are customarily employed ln the formulation of aqueous coating compositions.
Examples of suitable special-effect pigments are com-mercially available aluminum bronzes, the aluminum bronzes chromated according to DE-A-36 36 183, S stainless-steel bronzes and other customary metal flake or metal platelet pigments. Pearlescent and interference pigments are also suitable as special-effect pigments.
Examples of color pigments based on inorganic compounds are titanium dioxide, iron oxides, carbon blacks and others Examples of organic color pigments are Indanthrene blue, Chromophthal red, Irgazine orange, Sicotrans yellow, Heliogen green and others.
Preferred hydroxyl-containing binders for use in com-ponent A) are the water-dilutable or water-dispersible, optionally acrylicized polyurethanes (A1) and/or poly-acrylates (A2) already mentioned, which are customarily employed in aqueous coating compositions and can be prepared in organic form. In this context, the dilutability or dispersibility of the resins in water can also be adjusted by using appropriate solubilizers as cosolvent and/or solvent. Critical factors for the selection of the binders are, on the one hand, good stability on storage in organic solution, including in particular the ability to avoid settling of the pig-ments, and, if appropriate, on the other hand, the ability for the base paint to be incorporated into component B), or vice versa, without problems.
optionally acrylicized polyurethanes (Al) of this k;nd which are used as binders in component A) of the novel coating composition, and their preparation, are des-cribed in, for example, DE-A-40 10 176.
The optionally acrylicized polyurethane (A1) is prefer-ably prepared by well-known methods of polyurethane chemistry from the building blocks (Aiia) to (Aiif) described in DE-A-42 32 721.
The molecular weight of the polyurethane resins car. -as the person skilled in the art is aware - be controlled in particular by the proportion and the functionality of the starting compounds employed according to DE-A-42 32 721.
The polyurethane resins can be prepared both in bulk and in organic solvents.
A detailed description of the reaction, of the nature and of the quantities to be employed of building blocks (Aiia) to (Aiif) can be taken from DE-A-42 32 721 In accordance with DE-A-42 32 721 the acrylic}zed polyurethane resins (Al') are prepared by making ready a solution of the polyurethane resin (Al) in an organic solvent or an organic solvent mixture and, in this solution, polymerizing ethylenically unsaturated mono-mers or a mixture of ethylenically unsaturated monomers in a free-radical polymerization, and converting the reaction product thus obtained into an aqueous disper-s on. As ethylenically unsaturated monomers it is possible in accordance with DE-A-42 32 721 to employ virtually all free~radically polymerizable monomers, but subject to the customary restrictions for copoly-merizations as laid down by the Q and e scheme of Alfrey and Price and/or by the copolymerizat-on parameters (cf. e.g. Brandrup and Immergut, Polymer Handbook, 2nd ed. John Wiley + Sons, New York (1975)).
A detailed listing of the ethylenically unsaturated monomers can be taken from DE-A-42 32 721.
The polymers employed in accordance with the invention and prepared according to DE-A-42 32 721 must contain groups capable of forming anions, which groups are neutralized prior to or during the transfer of the polymers from the organic solvent or solvent mixture to water and which enable the formation of stable aqueous dispersions. The polymers in question can, in addition to the groups capable of forming anions, also contain other nonionic stabilizing groups, for example poly(oxy-alkylene) groups, especially poly(oxyethylene) and/orpoly(oxypropylene) and/or poly(oxyethylene)(oxypropylene) groups.
The introduction of the groups capable of forming anions into the polymers in question is described, for example, in DE-A-42 32 721.
Additionally preferred as water-soluble or water-dispersible binder component of component A) of the novel mixer system are water-dilutable or water-àispersible polyacrylate resins (A2) as described, for example, in DE-A-42 32 721.
The sum of the proportions by weight of the monomeric components of the polyacrylate resin (A2) which are described in DE-A-42 32 721 are [sic] selected in nature and quantity [sic] such that the polyacrylate resin (A2) has a hydroxyl number of from 5 to 40, preferably from 5 to 35 mg of KOH/g, and an acid number of from 20 to 100, preferably from 25 to 50 mg of KOH/g and a glass transition temperature (TG) Of from 40 degrees C to +60 degrees C, preferably from -20 degrees C to +40 degrees C.
A detailed description of the monomers and of the preparation of the polyacrylate resins (A2) can be taken from DE-A-42 32 721.
As binders in components A) it is of course also possible to employ mixtures of the said binders (Al) and (A2) and, in addition, other water-dilutable or water-dispersible binders, preferably containing hydroxyl groups.
It is essential to the invention that the base paints (A) are essentially free from water, preferably completely free from water. The water content of the base paints (A) should be less than 5~ by weight, based on th.e overall weight of the base paint (A).
As solvents the base paint (A) contains one or more organic solvents. Examples of suitable solvents are, in particular, water-soluble or water-dilutable solvents, for example alcohols, esters, ketones, keto esters, glycol ether esters and the like. Preference is given to employing alcohols and glycol ethers, particularly preferably butylglycol and butanols In this case there is the possibility, as described in DE-A-42 32 721, of employing during the actual preparation of the binders solvents which also remain subsequently as solvents in the base paint More frequently, however, the binders are prepared using a different solvent which following binder preparation is distilled off gently by means of vacuum distillation or thin-film evaporation and is replaced by a solvent which remains in the binder solution which is then employed in the base paint. Higher-boiling solvents should be soluble in water and remain in the poly-urethane resin solution employed in the base paint in order to facilitate the coalescence of the polymer particles during film formation.
Component A) may additionally comprise from 0 to 10% by weight, based on A), of customary auxiliaries and additives.
Examples of such additives are defoamers, dispersion auxiliaries, emulsifiers, leveling agents and others.
Component A) preferably contains Aa) from 0.5 to 70~ by weight of at least one special-effect pigment and/or at least one color pigment, Ab) from 10 to 80~ by weight of at least one water-dilutable or water-dispersible, hydroxyl-contain-ing binder, Ac) at least one organic solvent, and optionally Ad) auxiliaries and additives, the sum of the proportions by weight of components Aa) to Ad) making up in each case 100~ by weight of component A).
With particular preference component A) is composed of base paints (A') containing only special-effect pig-ments and of base paints (A'') containing only colorpigments.
Particularly preferred base paints (A') based on special-effect pigments contain Aa) from 0.5 to 50~ by weight of at least one special-effect pigment, Ab) from 20 to 80~ by weight of the water-dilutable or water-dispersible, hydroxyl-containing binder, and Ac) at least one organic solvent, the sum of the proportions by weight of components Aa) to Ac) being in each case 100~ by weight.
Particularly pre~erred base paints (A' ' ) based on lnorganic color pigments contain Aa) from 1 to 70% by weight of at least one inorganic color pigment, Ab) from 10 to 80~ by weight of at least one water-dilutable or water-dispersible, hydroxyl-contain-ing binder, and Ac) at least one organic solvent, the sum of the proportions by weight of components Aa) to Ac) being in each case 100~ by weight.
Particularly preferred base paints (A'') based on organic color pigments contain Aa) from 1 to 30~ by weight of at least one organic color pigment, Ab) from 10 to 80~ by weight of at least one water-dilutable or water-dispersible, hydroxyl-contain-ing binder, and Ac) at least one organic solvent, the sum of the proportions by weight of components Aa) to Ac) being in each case 100~ by weight.
It is of course also possible to employ base paints (A) containing a combination of at least one organic color pigment and at least one inorganic color pigment.
Regarding further criteria for the base paints (A), reference may be made to DE-A-41 10 520.
Component A) is prepared in accordance with methods known to the person skilled in the art, by mixing and, if appropriate, dispersing the individual components.
Eor instance, color pigments are usually incorporated CA 02246480 l998-08-l2 by dispersing the respective pigments with one or more of the above-described binders, which are preferably employed in the form of their solutions in organic solvents. If desired, further organic solvent can be added for dispersing. These pigments are dispersed with the aid of customary apparatus, for example bead mills and sand mills.
The special-effect pigments are usually incorporated by homogeneously mixing the special-effect pigments with one or more solvents. This mixture is then incorporated by stirring into a mixture of one or more of the above-described binders, with or without the addition of further organic solvents, by means of a stirrer or dissolver. The binders are preferably employed in the form of their solutions in organic solvents.
The respective proportions of pigment, binder and solvent depend in this instance, as familiar to the person skilled in the art, on the flow behavior of the pigment paste, and are therefore dependent on the particular pigment used.
A detailed description of the preparation of component A) can be taken from DE-A-4I 10 520.
The constituents of rl Pnt B) The aqueous component s) is free from pigment and contains at least one binder (BI). If desired, com-ponent B) can also contain further auxiliaries and additives, one or more water-dilutable or water-dispersible blnders, and organic solvents.
Suitable binders (B1) for use in component B) are preferably the water-dilutable or water-dispersible, hydroxyl-containing polyacrylate resins (A2) and the water-dilutable or water-dispersible, hydroxyl-contain-ing, optionally acrylicized polyurethane resins (A1) already described in connection with the description of component A), and also, furthermore, amino resins, polyester resins, different polyacrylate resins and different polyurethane resins which are dilutable or dispersible in water and preferably contain hydroxyl groups.
~hen used in component B) these binders (B1) can be employed not only as organic solution but also, preferably, in a water-containing form. The transfer of the resins into the aqueous phase is carried out, for example, by neutralizing the carrier groups (groups capable of forming anions or cations, for example carboxyl groups), and then carrying out dilution with water, with or without the prior partial removal of the organic solvent employed in preparing the resin, or by direct synthesis of the resin in the presence of water.
Eor further details reference may be made to the literature in which the preparation of the resins is described (cf. e.g. DE-A-32 10 051,DE-A-26 24 442, DE-A-37 39-332, US-A-4,719,132, EP-A-89 497, US-A-4,558,090, US-A-4,489,135,EP-A-38 127, DE-A-36 28 124, EP-A-158 099,DE-A-29 26 584, EP-A-195 931 and DE-A-33 21 180).
CA 02246480 l998-08-l2 Also suitable as binders (Bl) for component B) are water-dilutable or water-dispersible polyurethane resins which cannot be prepared in the form of organic solutions. Such resins are, in particular, polyurethane resins in which the isocyanate group-containing pre-polymer has been reacted with a polyamine as modifying agent. The preparation of these polyurethane resins is described, for example, in DE-A-42 32 721.
lo Also suitable as water-dilutable or water-dispersible binders (Bl) for component B) are the water-dilutable emulsion polymers described in DE-A-38 41 540. For further details reference is made to DE-A-38 41 540.
The aqueous component B) can, moreover, optionally lnclude one or more organic solvents in minor amounts and also, if desired, further customary auxiliaries and additives. Examples of suitable organic solvents are the solvents already listed in the description of component A). The content of organic solvent is usually from 0 to 3~ by weight, based on the overall weight of component B).
Examples of suitable auxiliaries and additives are likewise the additives mentioned in the description of component A). The quantity of these additives for use is usually from 0 to 10~ by weight, based on the overall weight of component s).
CA 02246480 l998-08-l2 The constituents of component C) Component C) contains at least one crosslinking agent (Cl) based on di- or polyisocyanates or comprssing mixtures thereof. In this context it is possible in principle also to employ the compounds already mentioned in the case of the description of component (Aiib), as crosslinking agents (Cl).
As crosslinking agent (Cl) it is possible to employ aliphatic and/or cycloaliphatic and/or aromatic poly-isocyanates. Examples of aromatic polyisocyanates are phenylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, biphenylene diisocyanate, naphthylene diisocyanate and diphenylmethane diisocyanate.
Owing to their good resistance to ultraviolet light, (cyclo)aliphatic polyisocyanates give rise to products with a low tendency to yellow. Examples of cyclo-aliphatic polyisocyanates are isophorone diisocyanate, cyclopentylene diisocyanate and the hydrogenation products of the aromatic diisocyanates, such as cyclohexylene diisocyanate, methylcyclohexylene diiso-cyanate and dicyclohexylmethane diisocyanate.
Aliphatic diisocyanates are compounds of the formula OCN-(CR3 2 ) r-NCO
in which r is an integer from 2 to 20, in particular from 6 to 8, and R3, ,which can be identical or different, is hydrogen or a lower alkyl radical having 1 to 8 carbon atoms, preferably 1 or 2 carbon atoms.
Examples thereof are trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diiso-cyanate, hexamethylene diisocyanate, propylene diiso-cyanate, ethylethylene diisocyanate, dimethylethyl 5 diisocyanate, methyltrimethylene diisocyanate and trimethylhexane diisocyanate.
Another example of a preferred aromatic diisocyanate (C1) is tetramethylxylene diisocyanate.
n addition to diisocyanates the crosslinking agent (Cl) may also include a proportion of polyisocyanates with functionalitles of more than two, for example triisocyanates.
Triisocyanates which have proven suitable are products produced by trimerization or oligomerization of diiso-cyanates or by reaction of diisocyanates with pGlyfunctional compounds containing OH or NH groups.
These include, for example, the biuret of hexamethylene diisocyanate and water, the isocyanurate of hexa-methylene diisocyanate, or the adduct of isophorone diisocyanate with trimethylolpropane. The mean functionality can be lowered if desired by adding monoisocyanates. Examples of such chain-terminating monoisocyanates are phenyl isocyanate, cyclohexyl isocyanate and stearyl isocyanate.
The crosslinking agent (C1) can be employed on its own as mixing component C), and preferably in solution or dispersion in a liquid solvent (C2). Suitable solvents (C2) are preferably organic solvents which show no reaction to the crosslinking agent. Examples which may be mentioned of appropriate organic solvents (C2) are esters, ketones, keto esters, glycol ether esters and the like.
If water or water-dilutable solvents (C2) are to be used, premixing with the crosslinking agent (C1) is preferred in order, on the one hand, to establish the lo viscosity in a desired manner and, on the other hand, to avoid a reaction of the crosslinking agent with, for example, the hydroxyl groups of the binders.
The constituents of component D) Component D) consists essentially of an aqueous solution or dispersion of a rheological auxiliary (D1).
The rheological auxiliary (D1) influences the applica-tion properties of the novel aqueous coating compositions in a highly critical manner. For example, in the case of aqueous coating compositions containing metal pigments, the orientation of the metal pigment particles, and thus the achievable metallic effect, depends quite essentially on the rheological properties of the aqueous coating composition.
Preferred rheological auxiliaries (D1) employed are phyllosilicates, which swell in water and form gels which, under shear stress, exhibit a high flow limit and a low plastic viscosity.
Very particular preference is given to the use of phyllosilicate dispersions according to DE-A-37 07 388, which are obtainable from phyllosilicates, a protective S colloid and an aqueous dispersing agent, the protective colloid being a poly(propylene oxide) which contains no hydrophobic end groups and has on average at least one hydroxyl group per molecule.
The novel process for the preparation of the aqueous coating compositions BM, and their application The novel process for the preparation of the aqueous coating compositions for the painting of vehicle interiors comprises the following stages:
In one embodiment of the invention I. a premix VM is prepared preferably from 5 to 85% by weight, particularly preferably from 10 to 75% by weight, of the above-described pigment-containing component A), preferably from 10 to 90% by weight, particularly preferably from 15 to 85% by weight, of the above-described binder-containing component B) and preferably from 5 to 50% by weight, particularly preferably from 10 to 40% by weight, of the above-described component C) containing crosslinking agent, the sum of components A), s) and C) making up 100% by weight of the premix VM, and then II. preferably from 10 to 9S~ by weight, particularly preferably from 20 to 90~ by weight, of the premix VM
is mixed with preferably from S to 90~ by weight, particularly preferably with from 10 to 80~ by weight, of the above-described rheology-controlling component D) to form the aqueous coating composition BM, the sum of the premix VM and of the component D) making up 100%
by weight of the aqueous coating composition BM, and finally the processing viscosity of the aqueous coating composition is established, preferably at from 15 to 40 seconds (DIN4 cup), by adding deionized water as component E).
In a further embodiment of the invention, of equal status, I. a premix VM is prepared preferably from 5 to 85~ by weight, particularly preferably from 10 to 75~ by weight, of the above-described pigment-containing component A), preferably from 10 to 90~ by weight, particularly preferably from 15 to 85~ by weight, of the above-described binder-containing component B) and preferably from 5 to 85% by weight, particularly preferably from 10 to 75~ by weight, of the above-described rheology-controlling component D), the sum of components A), B) and D) making up 100~ by weight of the premix VM, and then II. preferably from 50 to 95~ by weight, particularly preferably from 60 to 90~ by weight, of the premix VM
is mixed with preferably from 5 to 50~ by weight, particularly preferably with from lO to 40~ by weight, of the above-described component C) containing crosslinking agent to form the aqueous coating composition BM, the sum of the premix VM and of the component C) making up 100~ by weight of the aqueous coating composition BM, and finally the processing viscosity of the aqueous coating composition BM is established, preferably at from 15 to 40 seconds (DIN4 cup), by means of deionized water as component E).
The premix VM and the novel aqueous coating composition BM are prepared by methods known to the person skilled in the art, by mixing and, if desired, dispersing the individual components.
The aqueous coating compositions BM prepared using the novel mixer system are preferably applied in vehicle interiors to substrates prepared in accordance with the prior art, for example in production-line autofinishing 2s and, in particular, in automotive refinishing.
A particular advantage is that the coatings with the novel paints in vehicle interiors require no additional coating by a transparent topcoat.
The aqueous coating compositions BM are applied directly after their preparation by the novel process to the appropriately prepared damage site (for example by means of filling and surfacers) by customary methods, in particular by means of spray painting.
The film prepared in this way is cured at room tempera-ture or by forced drying (e.g. 10 min at 60 degrees C, 80 degrees C or by IR drying). The dry film thicknesses of the matt paint film are between 5 and 100, preferably between 10 and 70 micrometers.
In the text below the invention is illustrated in more detail with reference to working examples. All parts and percentages are by weight unless expressly stated otherwise.
Exa~ples Exa~ple ~: Preparation of the base paints (A') and (A'') for ~, , ~nt A) Preparation of a polyurethane resin (Al) as binder for the base paints (A') and (A''):
686. 3 g of a polyester having a number-average molecular weight Mn of 1400 daltons, based on a commercial unsaturated di~eric fatty acid (having an iodine number of 10 mg of I2/g, a monomer content of not more than 0.1~, a trimer content of not more than 2~, an acid number of from l9S to 200 mg of KOH/g and a hydrolysis number of from 197 to 202 mg of KOH/g), isophthalic acid and hexanediol are charged, under a protective gas, to a suitable reaction vessel with stirrer, reflux condenser and feed vessel, and, in succession, 10.8 g of hexanediol, 55.9 g of dimethylolpropionic acid, 344.9 g of methyl ethyl ketone and 303.6 g of 4,4'-di(isocyanatocyclohexyl)-methane are added.
This mixture is held under reflux until the isocyanate content has fallen to 1.0~. Then 26.7 g of trimethylol-propane are added to the mixture and this mixture is held under reflux until the viscosity is 12 dPas (in a solution of resin:N-methylpyrrolidone = 1:1). Then 1378.7 g of butylglycol are added.
After a vacuum distillation in which the methyl ethyl ketone is removed, the resin solution is neutralized with 32.7 g of dimethylethanolamine.
The solids content of the resulting solution of the polyurethane resin (A1) is 44~ by weight. The com-position obtained is diluted with butylglycol, with intense stirring, to a solids content of 41~ by weight.
Preparation of the ba~e paint (A'):
20 parts by weight of an aluminum bronze chromated in accordance with DE-A-36 36 183 (aluminum content 65~, average particle diameter: 15 micrometers) are dispersed homogeneously in 9 parts by weight of butylglycol and 7 parts by weight of isobutanol by stirring for lS minutes, and this dispersion is then mixed with stirring into 64 parts by weight of the solution of the polyurethane resin (A1) This mixture is stirred for a further 30 minutes using a high-speed stirrer at 1000 rpm.
Preparation of the base paint (A''):
8 parts by weight of Paliogen blue, 73.5 parts by weight of the solution of the polyurethane resin (A1), 10.5 parts by weight of butylglycol and 8 parts by weight of isobutanol are mixed with stirring and dispersed using a sand mill.
Example 2: Preparation of c , ~t B) 2reparation of the binder (31) for component B):
686.3 g of a polyester having a number-average molecular weight Mn of 1400 daltons, based on a commercial unsaturated dimeric fatty acid (having an iodine number of 10 mg of I2/g, a monomer content of not more than 0 1~, a trimer content of not more than 2~, an acid number of from 195 to 200 mg of KOH/g and a hydrolysis number of from 197 to 202 mg of KOH/g), isophthalic acid and hexan~iol are charged, under a protective gas, to a suitable reaction vessel with stirrer, reflux condenser and feed vessel, and, in succession, 10.8 g of hexanediol, 55.9 g of dimethylolpropionic acid, 344.9 g of methyl ethyl ketone and 303.6 g of 4,4'-di(isocyanatocyclohexyl)-methane are added.
This mixture is held under reflux until the isocyanate content has fallen to l.0~. Then 26.7 g of trimethylol-propane are added to the mixture and this mixture is held under reflux until the viscosity is 12 dPas (in a solution of resin:N-methylpyrrolidone = 1:1).
By adding 47.7 g of butylglycol, any excess isocyanate present is destroyed.
Then 32.7 g of dimethylethanolamine, 2688.3 [lacuna]
deionized water and 193.0 g of butylglycol are added to the reaction mixture with vigorous stirring.
After removing the methyl ethyl ketone by vacuum distillation, the dispersion of the polyurethane resin (B1) is obtained with a solids content of about 27~.
Preparation of co~ponent 8):
52 parts by weight of deionized water, 0.5 part by weight of a commercial defoamer and 3.5 parts by weight of a 3.5~ strength solution of a commercial poly-acrylate thickener in water are added with stirring to 44 parts by weight of the dispersion of the polyurethane resin (B1).
Example 3: Preparation of the aqueous coating com-position BMl by the process according to claim 1:
Stage I:
121.9 parts by volume of the base paint (A') of Examp e 1 and 49.6 parts by volume of the base paint (A'') o-Example 1 are mixed as component A), with inter.se stirring, with 351.1 parts by volume of component B) of Example 2 and 200 parts by volume of an isocyanate curing agent (Glassodur~ hardener "sehr kurz" [very short] from BASF ~acke+Farben based on 1,6-hexa-methylene diisocyanate) as component C). This gives the premix VMl.
Stage II:
The premix VMl is admixed, with intense stirring, with 463.4 parts by volume of rheological auxiliary (adjustment additive 93-E3 from Glasurit, based on an inorganic sodium-magnesium phyllosilicate thickener) as component D). This gives the intermediate mixture ZMl.
Finally, the intermediate mixture ZMl is admixed, with intense stirring, with 200 parts by volume of deionized water as component E). This gives the aqueous coating composition BMl.
CA 02246480 l998-08-l2 Example 4: Preparation of the aqueous coating com-position BM2 by the process according to claim 2:
Stage I:
121.9 parts by volume of the base paint (A') of Example 1 and 49.6 parts by volume of the base paint (A'') of Example l are mixed as component A), with intense stirring, with 351.1 parts by volume of component B) of Example 2 and 463.4 parts by volume of rheological auxiliary (adjustment additive 93-E3 from Glasurit) as component D). This gives the premix VM2.
Stage II:
The premix VM2 is admixed, with intense stirring, with 200 parts by volume of isocyanate curing agent (Glassodur~ hardener "sehr kurz~ [very short] from BASF
Lacke+Farben AG) as component C). This gives the intermediate mixture ZM2.
Finally, the intermediate mixture ZM2 is admixed, with intense stirring, with 200 parts by volume of deionized water as component E) This gives the aqueous coating 2s composition BM2.
Example 5: Application of the aqueous coating com-positions BM1 and BM2, and properties of the resulting f;n; ~h~E
Directly after the preparation of the aqueous coatlng compositions BM1 and BM2, they are sprayed (2 spray passes with HLVP or standard spray gun) by well-known metnods onto phosphated steel panels (bonder 132) coated with a commercial electrodeposition coating and a conventional (i.e. solvent-containing) or water-cor.taining surfacer, and are dried, following a flash-off time of 30 minutes, for a further 30 minutes at 60 degrees C The dry-film thickness of the aqueous coa~lng compositions BM1 and BM2 is from about 20 to 25 micrometers.
The resulting paint films are matt and of high scratcn resistance. In the context of the painting of vehicle interiors, the shade of the paint film can be matched precisely, by identical choice and combination of the base paints, to the shade of the vehicle exterior fir.ish, for which it is necessary to apply as further coating a 2-component clearcoat as topcoat (compare for example DE-A-41 10 520).
I. preparation of a premix VM including a plgment-containing component A), a binder-containing component B) and a component C) which contains crosslinking agent, or a rheology-controlling component D), and then II. preparation of an aqueous coating composition BM
from the premix VM and the rheology-controlling component D) or the component C) containing crosslinking agent, provided these components are not present in the premix VM, and final estab-lishment of the processing viscosity of the coating composition BM by addition of deionized water as component ~).
Prior art Multicomponent mixer systems on an aqueous basis for production-line autofinishing and/or for the refinish-lng of damage sites, especially for automotiverefinishing, are known.
DE A-42 32 721 describes two-component mixer systems consisting of different base paints, containing less than 5~ by weight of water, at least one color and/or special-effect pigment, organic solvent, optionally auxiliaries and additives, and a water-dilutable blnder, and consisting of a water-containing, pigment-free component. The binders employed in the base paints comprise at least one water-dilutable or water-dispersible acrylicized polyurethane resin and/or at least one water-dilutable or water-dispersible poly-acrylate resin. The mixer systems described in DE A 42 32 721 are preferably employed as aqueous coating compositions for producing a basecoat film After initial drying of the basecoat films produced in this way, an appropriate transparent topcoat com-position is applied. Suitable topcoats include both organically dissolved and aqueous 1- or 2-component clearcoats, and also transparent powder coatings. Use is often made of 2-component clearcoats based on a hydroxyl-containing acrylate copolymer and a polylso-cyanate. Clearcoats of this kind are described, for example, in DE-A-34 12 534, DE-A-36 09 519, DE-A
37 31 552 and DE-A-38 2 3 oos. Suitable 1-component clearcoats, based for example on a hydroxyl-containing binder and an amino resin hardener, are likewise known and are described, for example, in Kittel, Lehrbuch der Lacke und Beschichtungen [Textbook of paints and coatings], Volume IV, Verlag W.A. Colomb in der H.
Heeremann GmbH, Berlin-Oberschwandorf, 1976. In general, after any flashing off period which may be required, the basecoat is dried together with the topcoat.
Object and achievement The requirements in the painting of production-line components or in automotive refinishing are based on the high demands placed on such coatings in terms of mechanical strength, for example against impact or stone chipping, brilliant surface and weathering stability, and are based in turn on the exterior finish of automotive components.
Such requirements necessitate technologically complex multicoat finishes, for example that described above consisting of basecoat film and topcoat film, the application of which is laborious. Automotive interior finishes need satisfy only some of such requirements.
In particular, the stringent requirements placed on mechanical strength, the brilliance of the paint surface and the weathering stability are not as exact-ing as in the case of exterior finishes. In contrast, there are stringent requirements regarding the color uniformity of interior and exterior finish.
The object of the present invention, therefore, was to modify existing coating compositions, prepared, for example, from mixer systems, for the production of basecoat films in the exterior finishing of vehicles in such a way that it is possible for the interior finish-ing of vehicles to use constituents of such mixer systems which insure, in particular, color uniformity, and such that no topcoat films are necessary in the case of interior finishing.
Surprisingly it has been found that aqueous coating compositions BM for the painting of vehicle interiors, which compositions conform outstandingly to the criteria set out in stating the object, can be prepared in a simple manner as follows:
I. a premix VM is prepared consisting of A) different base paints (A) according to DE-A-42 32 721, and comprising less than 5~ by weight of water, at least one color and/or special-effect pigment, organic solvents, and at least one water-dilutable or water-dispersible hydroxyl-containing binder, preferably a water-dilutable or water-dispersible hydroxyl-csntaining polyacrylate resin (A2) having a hydroxyl number of from 5 to 40 mg of KOH/g and/or at least one water-dilutable or water-dispersible hydroxyl-containing, optionally acrylicized polyurethane resin (A1) having a hydroxyl number of from 20 to 100 mg of KOH/g, and of B) at least one aqueous, pigment-free component comprising at least one optionally hydroxyl-containing binder (B1), and of C) a solution or dispersion of a polyisocyanate (Cl) or of a mixture of polyisocyanates (C1) or, alternatively to C), of D) an aqueous solution or dispersion of a rheological auxiliary (D1), and then II. in order to prepare the aqueous coating composition sM, as component D) an aqueous solution or an aqueous dispersion or an aqueous solution [sic] of a rheologi-cal auxiliary (D1) or, alternatively, as component C) asolution or a dispersion of a polyisocyanate (C1) or of a mixture of polyisocyanates (C1) is admixed to the premix VM, provided the respective component C) or D) is not present in the premix VM, and finally the processing viscosity of the aqueous coating composition sM is established by adding deionized water as com-ponent E).
The spray paints produced in this way can be employed for vehicle interior painting without additional application of a topcoat.
The base paints (A) used in component A) are preferably free from water.
The di- and/or polyisocyanates (C') or their mixtures which are employed are preferably isomers or lsomer mixtures of aliphatic and/or cycloaliphatic and/or aromatic di- and/or polyisocyanates in organic or aqueous solution or in organic or aqueous dispersion.
Implementation of the invention Ihe ~ nt~ of the aqueous coating composition BM
Ihe constituents of c _ ~~t A) Component A) of the mixer system can include all customary paint pigments provided that they do not react with water within a short time, for example within the period of time between preparing the aqueous coating compositions BM according to the novel process and the application of the aqueous coating compositions, and that they do not dissolve in water.
This component A) may include special-effect pigments and/or color pigments based on inorganic or organic compounds. In order to insure a scope for use which is as universal as possible and to be able to realize the maximum possible number of shades, it is preferred to construct as component A) a mixer system based on components containing only color pigments and components containing only speclal-effect pigments.
For preparing component A) it is possible to use all special-effect pigments which are customarily employed ln the formulation of aqueous coating compositions.
Examples of suitable special-effect pigments are com-mercially available aluminum bronzes, the aluminum bronzes chromated according to DE-A-36 36 183, S stainless-steel bronzes and other customary metal flake or metal platelet pigments. Pearlescent and interference pigments are also suitable as special-effect pigments.
Examples of color pigments based on inorganic compounds are titanium dioxide, iron oxides, carbon blacks and others Examples of organic color pigments are Indanthrene blue, Chromophthal red, Irgazine orange, Sicotrans yellow, Heliogen green and others.
Preferred hydroxyl-containing binders for use in com-ponent A) are the water-dilutable or water-dispersible, optionally acrylicized polyurethanes (A1) and/or poly-acrylates (A2) already mentioned, which are customarily employed in aqueous coating compositions and can be prepared in organic form. In this context, the dilutability or dispersibility of the resins in water can also be adjusted by using appropriate solubilizers as cosolvent and/or solvent. Critical factors for the selection of the binders are, on the one hand, good stability on storage in organic solution, including in particular the ability to avoid settling of the pig-ments, and, if appropriate, on the other hand, the ability for the base paint to be incorporated into component B), or vice versa, without problems.
optionally acrylicized polyurethanes (Al) of this k;nd which are used as binders in component A) of the novel coating composition, and their preparation, are des-cribed in, for example, DE-A-40 10 176.
The optionally acrylicized polyurethane (A1) is prefer-ably prepared by well-known methods of polyurethane chemistry from the building blocks (Aiia) to (Aiif) described in DE-A-42 32 721.
The molecular weight of the polyurethane resins car. -as the person skilled in the art is aware - be controlled in particular by the proportion and the functionality of the starting compounds employed according to DE-A-42 32 721.
The polyurethane resins can be prepared both in bulk and in organic solvents.
A detailed description of the reaction, of the nature and of the quantities to be employed of building blocks (Aiia) to (Aiif) can be taken from DE-A-42 32 721 In accordance with DE-A-42 32 721 the acrylic}zed polyurethane resins (Al') are prepared by making ready a solution of the polyurethane resin (Al) in an organic solvent or an organic solvent mixture and, in this solution, polymerizing ethylenically unsaturated mono-mers or a mixture of ethylenically unsaturated monomers in a free-radical polymerization, and converting the reaction product thus obtained into an aqueous disper-s on. As ethylenically unsaturated monomers it is possible in accordance with DE-A-42 32 721 to employ virtually all free~radically polymerizable monomers, but subject to the customary restrictions for copoly-merizations as laid down by the Q and e scheme of Alfrey and Price and/or by the copolymerizat-on parameters (cf. e.g. Brandrup and Immergut, Polymer Handbook, 2nd ed. John Wiley + Sons, New York (1975)).
A detailed listing of the ethylenically unsaturated monomers can be taken from DE-A-42 32 721.
The polymers employed in accordance with the invention and prepared according to DE-A-42 32 721 must contain groups capable of forming anions, which groups are neutralized prior to or during the transfer of the polymers from the organic solvent or solvent mixture to water and which enable the formation of stable aqueous dispersions. The polymers in question can, in addition to the groups capable of forming anions, also contain other nonionic stabilizing groups, for example poly(oxy-alkylene) groups, especially poly(oxyethylene) and/orpoly(oxypropylene) and/or poly(oxyethylene)(oxypropylene) groups.
The introduction of the groups capable of forming anions into the polymers in question is described, for example, in DE-A-42 32 721.
Additionally preferred as water-soluble or water-dispersible binder component of component A) of the novel mixer system are water-dilutable or water-àispersible polyacrylate resins (A2) as described, for example, in DE-A-42 32 721.
The sum of the proportions by weight of the monomeric components of the polyacrylate resin (A2) which are described in DE-A-42 32 721 are [sic] selected in nature and quantity [sic] such that the polyacrylate resin (A2) has a hydroxyl number of from 5 to 40, preferably from 5 to 35 mg of KOH/g, and an acid number of from 20 to 100, preferably from 25 to 50 mg of KOH/g and a glass transition temperature (TG) Of from 40 degrees C to +60 degrees C, preferably from -20 degrees C to +40 degrees C.
A detailed description of the monomers and of the preparation of the polyacrylate resins (A2) can be taken from DE-A-42 32 721.
As binders in components A) it is of course also possible to employ mixtures of the said binders (Al) and (A2) and, in addition, other water-dilutable or water-dispersible binders, preferably containing hydroxyl groups.
It is essential to the invention that the base paints (A) are essentially free from water, preferably completely free from water. The water content of the base paints (A) should be less than 5~ by weight, based on th.e overall weight of the base paint (A).
As solvents the base paint (A) contains one or more organic solvents. Examples of suitable solvents are, in particular, water-soluble or water-dilutable solvents, for example alcohols, esters, ketones, keto esters, glycol ether esters and the like. Preference is given to employing alcohols and glycol ethers, particularly preferably butylglycol and butanols In this case there is the possibility, as described in DE-A-42 32 721, of employing during the actual preparation of the binders solvents which also remain subsequently as solvents in the base paint More frequently, however, the binders are prepared using a different solvent which following binder preparation is distilled off gently by means of vacuum distillation or thin-film evaporation and is replaced by a solvent which remains in the binder solution which is then employed in the base paint. Higher-boiling solvents should be soluble in water and remain in the poly-urethane resin solution employed in the base paint in order to facilitate the coalescence of the polymer particles during film formation.
Component A) may additionally comprise from 0 to 10% by weight, based on A), of customary auxiliaries and additives.
Examples of such additives are defoamers, dispersion auxiliaries, emulsifiers, leveling agents and others.
Component A) preferably contains Aa) from 0.5 to 70~ by weight of at least one special-effect pigment and/or at least one color pigment, Ab) from 10 to 80~ by weight of at least one water-dilutable or water-dispersible, hydroxyl-contain-ing binder, Ac) at least one organic solvent, and optionally Ad) auxiliaries and additives, the sum of the proportions by weight of components Aa) to Ad) making up in each case 100~ by weight of component A).
With particular preference component A) is composed of base paints (A') containing only special-effect pig-ments and of base paints (A'') containing only colorpigments.
Particularly preferred base paints (A') based on special-effect pigments contain Aa) from 0.5 to 50~ by weight of at least one special-effect pigment, Ab) from 20 to 80~ by weight of the water-dilutable or water-dispersible, hydroxyl-containing binder, and Ac) at least one organic solvent, the sum of the proportions by weight of components Aa) to Ac) being in each case 100~ by weight.
Particularly pre~erred base paints (A' ' ) based on lnorganic color pigments contain Aa) from 1 to 70% by weight of at least one inorganic color pigment, Ab) from 10 to 80~ by weight of at least one water-dilutable or water-dispersible, hydroxyl-contain-ing binder, and Ac) at least one organic solvent, the sum of the proportions by weight of components Aa) to Ac) being in each case 100~ by weight.
Particularly preferred base paints (A'') based on organic color pigments contain Aa) from 1 to 30~ by weight of at least one organic color pigment, Ab) from 10 to 80~ by weight of at least one water-dilutable or water-dispersible, hydroxyl-contain-ing binder, and Ac) at least one organic solvent, the sum of the proportions by weight of components Aa) to Ac) being in each case 100~ by weight.
It is of course also possible to employ base paints (A) containing a combination of at least one organic color pigment and at least one inorganic color pigment.
Regarding further criteria for the base paints (A), reference may be made to DE-A-41 10 520.
Component A) is prepared in accordance with methods known to the person skilled in the art, by mixing and, if appropriate, dispersing the individual components.
Eor instance, color pigments are usually incorporated CA 02246480 l998-08-l2 by dispersing the respective pigments with one or more of the above-described binders, which are preferably employed in the form of their solutions in organic solvents. If desired, further organic solvent can be added for dispersing. These pigments are dispersed with the aid of customary apparatus, for example bead mills and sand mills.
The special-effect pigments are usually incorporated by homogeneously mixing the special-effect pigments with one or more solvents. This mixture is then incorporated by stirring into a mixture of one or more of the above-described binders, with or without the addition of further organic solvents, by means of a stirrer or dissolver. The binders are preferably employed in the form of their solutions in organic solvents.
The respective proportions of pigment, binder and solvent depend in this instance, as familiar to the person skilled in the art, on the flow behavior of the pigment paste, and are therefore dependent on the particular pigment used.
A detailed description of the preparation of component A) can be taken from DE-A-4I 10 520.
The constituents of rl Pnt B) The aqueous component s) is free from pigment and contains at least one binder (BI). If desired, com-ponent B) can also contain further auxiliaries and additives, one or more water-dilutable or water-dispersible blnders, and organic solvents.
Suitable binders (B1) for use in component B) are preferably the water-dilutable or water-dispersible, hydroxyl-containing polyacrylate resins (A2) and the water-dilutable or water-dispersible, hydroxyl-contain-ing, optionally acrylicized polyurethane resins (A1) already described in connection with the description of component A), and also, furthermore, amino resins, polyester resins, different polyacrylate resins and different polyurethane resins which are dilutable or dispersible in water and preferably contain hydroxyl groups.
~hen used in component B) these binders (B1) can be employed not only as organic solution but also, preferably, in a water-containing form. The transfer of the resins into the aqueous phase is carried out, for example, by neutralizing the carrier groups (groups capable of forming anions or cations, for example carboxyl groups), and then carrying out dilution with water, with or without the prior partial removal of the organic solvent employed in preparing the resin, or by direct synthesis of the resin in the presence of water.
Eor further details reference may be made to the literature in which the preparation of the resins is described (cf. e.g. DE-A-32 10 051,DE-A-26 24 442, DE-A-37 39-332, US-A-4,719,132, EP-A-89 497, US-A-4,558,090, US-A-4,489,135,EP-A-38 127, DE-A-36 28 124, EP-A-158 099,DE-A-29 26 584, EP-A-195 931 and DE-A-33 21 180).
CA 02246480 l998-08-l2 Also suitable as binders (Bl) for component B) are water-dilutable or water-dispersible polyurethane resins which cannot be prepared in the form of organic solutions. Such resins are, in particular, polyurethane resins in which the isocyanate group-containing pre-polymer has been reacted with a polyamine as modifying agent. The preparation of these polyurethane resins is described, for example, in DE-A-42 32 721.
lo Also suitable as water-dilutable or water-dispersible binders (Bl) for component B) are the water-dilutable emulsion polymers described in DE-A-38 41 540. For further details reference is made to DE-A-38 41 540.
The aqueous component B) can, moreover, optionally lnclude one or more organic solvents in minor amounts and also, if desired, further customary auxiliaries and additives. Examples of suitable organic solvents are the solvents already listed in the description of component A). The content of organic solvent is usually from 0 to 3~ by weight, based on the overall weight of component B).
Examples of suitable auxiliaries and additives are likewise the additives mentioned in the description of component A). The quantity of these additives for use is usually from 0 to 10~ by weight, based on the overall weight of component s).
CA 02246480 l998-08-l2 The constituents of component C) Component C) contains at least one crosslinking agent (Cl) based on di- or polyisocyanates or comprssing mixtures thereof. In this context it is possible in principle also to employ the compounds already mentioned in the case of the description of component (Aiib), as crosslinking agents (Cl).
As crosslinking agent (Cl) it is possible to employ aliphatic and/or cycloaliphatic and/or aromatic poly-isocyanates. Examples of aromatic polyisocyanates are phenylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, biphenylene diisocyanate, naphthylene diisocyanate and diphenylmethane diisocyanate.
Owing to their good resistance to ultraviolet light, (cyclo)aliphatic polyisocyanates give rise to products with a low tendency to yellow. Examples of cyclo-aliphatic polyisocyanates are isophorone diisocyanate, cyclopentylene diisocyanate and the hydrogenation products of the aromatic diisocyanates, such as cyclohexylene diisocyanate, methylcyclohexylene diiso-cyanate and dicyclohexylmethane diisocyanate.
Aliphatic diisocyanates are compounds of the formula OCN-(CR3 2 ) r-NCO
in which r is an integer from 2 to 20, in particular from 6 to 8, and R3, ,which can be identical or different, is hydrogen or a lower alkyl radical having 1 to 8 carbon atoms, preferably 1 or 2 carbon atoms.
Examples thereof are trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diiso-cyanate, hexamethylene diisocyanate, propylene diiso-cyanate, ethylethylene diisocyanate, dimethylethyl 5 diisocyanate, methyltrimethylene diisocyanate and trimethylhexane diisocyanate.
Another example of a preferred aromatic diisocyanate (C1) is tetramethylxylene diisocyanate.
n addition to diisocyanates the crosslinking agent (Cl) may also include a proportion of polyisocyanates with functionalitles of more than two, for example triisocyanates.
Triisocyanates which have proven suitable are products produced by trimerization or oligomerization of diiso-cyanates or by reaction of diisocyanates with pGlyfunctional compounds containing OH or NH groups.
These include, for example, the biuret of hexamethylene diisocyanate and water, the isocyanurate of hexa-methylene diisocyanate, or the adduct of isophorone diisocyanate with trimethylolpropane. The mean functionality can be lowered if desired by adding monoisocyanates. Examples of such chain-terminating monoisocyanates are phenyl isocyanate, cyclohexyl isocyanate and stearyl isocyanate.
The crosslinking agent (C1) can be employed on its own as mixing component C), and preferably in solution or dispersion in a liquid solvent (C2). Suitable solvents (C2) are preferably organic solvents which show no reaction to the crosslinking agent. Examples which may be mentioned of appropriate organic solvents (C2) are esters, ketones, keto esters, glycol ether esters and the like.
If water or water-dilutable solvents (C2) are to be used, premixing with the crosslinking agent (C1) is preferred in order, on the one hand, to establish the lo viscosity in a desired manner and, on the other hand, to avoid a reaction of the crosslinking agent with, for example, the hydroxyl groups of the binders.
The constituents of component D) Component D) consists essentially of an aqueous solution or dispersion of a rheological auxiliary (D1).
The rheological auxiliary (D1) influences the applica-tion properties of the novel aqueous coating compositions in a highly critical manner. For example, in the case of aqueous coating compositions containing metal pigments, the orientation of the metal pigment particles, and thus the achievable metallic effect, depends quite essentially on the rheological properties of the aqueous coating composition.
Preferred rheological auxiliaries (D1) employed are phyllosilicates, which swell in water and form gels which, under shear stress, exhibit a high flow limit and a low plastic viscosity.
Very particular preference is given to the use of phyllosilicate dispersions according to DE-A-37 07 388, which are obtainable from phyllosilicates, a protective S colloid and an aqueous dispersing agent, the protective colloid being a poly(propylene oxide) which contains no hydrophobic end groups and has on average at least one hydroxyl group per molecule.
The novel process for the preparation of the aqueous coating compositions BM, and their application The novel process for the preparation of the aqueous coating compositions for the painting of vehicle interiors comprises the following stages:
In one embodiment of the invention I. a premix VM is prepared preferably from 5 to 85% by weight, particularly preferably from 10 to 75% by weight, of the above-described pigment-containing component A), preferably from 10 to 90% by weight, particularly preferably from 15 to 85% by weight, of the above-described binder-containing component B) and preferably from 5 to 50% by weight, particularly preferably from 10 to 40% by weight, of the above-described component C) containing crosslinking agent, the sum of components A), s) and C) making up 100% by weight of the premix VM, and then II. preferably from 10 to 9S~ by weight, particularly preferably from 20 to 90~ by weight, of the premix VM
is mixed with preferably from S to 90~ by weight, particularly preferably with from 10 to 80~ by weight, of the above-described rheology-controlling component D) to form the aqueous coating composition BM, the sum of the premix VM and of the component D) making up 100%
by weight of the aqueous coating composition BM, and finally the processing viscosity of the aqueous coating composition is established, preferably at from 15 to 40 seconds (DIN4 cup), by adding deionized water as component E).
In a further embodiment of the invention, of equal status, I. a premix VM is prepared preferably from 5 to 85~ by weight, particularly preferably from 10 to 75~ by weight, of the above-described pigment-containing component A), preferably from 10 to 90~ by weight, particularly preferably from 15 to 85~ by weight, of the above-described binder-containing component B) and preferably from 5 to 85% by weight, particularly preferably from 10 to 75~ by weight, of the above-described rheology-controlling component D), the sum of components A), B) and D) making up 100~ by weight of the premix VM, and then II. preferably from 50 to 95~ by weight, particularly preferably from 60 to 90~ by weight, of the premix VM
is mixed with preferably from 5 to 50~ by weight, particularly preferably with from lO to 40~ by weight, of the above-described component C) containing crosslinking agent to form the aqueous coating composition BM, the sum of the premix VM and of the component C) making up 100~ by weight of the aqueous coating composition BM, and finally the processing viscosity of the aqueous coating composition BM is established, preferably at from 15 to 40 seconds (DIN4 cup), by means of deionized water as component E).
The premix VM and the novel aqueous coating composition BM are prepared by methods known to the person skilled in the art, by mixing and, if desired, dispersing the individual components.
The aqueous coating compositions BM prepared using the novel mixer system are preferably applied in vehicle interiors to substrates prepared in accordance with the prior art, for example in production-line autofinishing 2s and, in particular, in automotive refinishing.
A particular advantage is that the coatings with the novel paints in vehicle interiors require no additional coating by a transparent topcoat.
The aqueous coating compositions BM are applied directly after their preparation by the novel process to the appropriately prepared damage site (for example by means of filling and surfacers) by customary methods, in particular by means of spray painting.
The film prepared in this way is cured at room tempera-ture or by forced drying (e.g. 10 min at 60 degrees C, 80 degrees C or by IR drying). The dry film thicknesses of the matt paint film are between 5 and 100, preferably between 10 and 70 micrometers.
In the text below the invention is illustrated in more detail with reference to working examples. All parts and percentages are by weight unless expressly stated otherwise.
Exa~ples Exa~ple ~: Preparation of the base paints (A') and (A'') for ~, , ~nt A) Preparation of a polyurethane resin (Al) as binder for the base paints (A') and (A''):
686. 3 g of a polyester having a number-average molecular weight Mn of 1400 daltons, based on a commercial unsaturated di~eric fatty acid (having an iodine number of 10 mg of I2/g, a monomer content of not more than 0.1~, a trimer content of not more than 2~, an acid number of from l9S to 200 mg of KOH/g and a hydrolysis number of from 197 to 202 mg of KOH/g), isophthalic acid and hexanediol are charged, under a protective gas, to a suitable reaction vessel with stirrer, reflux condenser and feed vessel, and, in succession, 10.8 g of hexanediol, 55.9 g of dimethylolpropionic acid, 344.9 g of methyl ethyl ketone and 303.6 g of 4,4'-di(isocyanatocyclohexyl)-methane are added.
This mixture is held under reflux until the isocyanate content has fallen to 1.0~. Then 26.7 g of trimethylol-propane are added to the mixture and this mixture is held under reflux until the viscosity is 12 dPas (in a solution of resin:N-methylpyrrolidone = 1:1). Then 1378.7 g of butylglycol are added.
After a vacuum distillation in which the methyl ethyl ketone is removed, the resin solution is neutralized with 32.7 g of dimethylethanolamine.
The solids content of the resulting solution of the polyurethane resin (A1) is 44~ by weight. The com-position obtained is diluted with butylglycol, with intense stirring, to a solids content of 41~ by weight.
Preparation of the ba~e paint (A'):
20 parts by weight of an aluminum bronze chromated in accordance with DE-A-36 36 183 (aluminum content 65~, average particle diameter: 15 micrometers) are dispersed homogeneously in 9 parts by weight of butylglycol and 7 parts by weight of isobutanol by stirring for lS minutes, and this dispersion is then mixed with stirring into 64 parts by weight of the solution of the polyurethane resin (A1) This mixture is stirred for a further 30 minutes using a high-speed stirrer at 1000 rpm.
Preparation of the base paint (A''):
8 parts by weight of Paliogen blue, 73.5 parts by weight of the solution of the polyurethane resin (A1), 10.5 parts by weight of butylglycol and 8 parts by weight of isobutanol are mixed with stirring and dispersed using a sand mill.
Example 2: Preparation of c , ~t B) 2reparation of the binder (31) for component B):
686.3 g of a polyester having a number-average molecular weight Mn of 1400 daltons, based on a commercial unsaturated dimeric fatty acid (having an iodine number of 10 mg of I2/g, a monomer content of not more than 0 1~, a trimer content of not more than 2~, an acid number of from 195 to 200 mg of KOH/g and a hydrolysis number of from 197 to 202 mg of KOH/g), isophthalic acid and hexan~iol are charged, under a protective gas, to a suitable reaction vessel with stirrer, reflux condenser and feed vessel, and, in succession, 10.8 g of hexanediol, 55.9 g of dimethylolpropionic acid, 344.9 g of methyl ethyl ketone and 303.6 g of 4,4'-di(isocyanatocyclohexyl)-methane are added.
This mixture is held under reflux until the isocyanate content has fallen to l.0~. Then 26.7 g of trimethylol-propane are added to the mixture and this mixture is held under reflux until the viscosity is 12 dPas (in a solution of resin:N-methylpyrrolidone = 1:1).
By adding 47.7 g of butylglycol, any excess isocyanate present is destroyed.
Then 32.7 g of dimethylethanolamine, 2688.3 [lacuna]
deionized water and 193.0 g of butylglycol are added to the reaction mixture with vigorous stirring.
After removing the methyl ethyl ketone by vacuum distillation, the dispersion of the polyurethane resin (B1) is obtained with a solids content of about 27~.
Preparation of co~ponent 8):
52 parts by weight of deionized water, 0.5 part by weight of a commercial defoamer and 3.5 parts by weight of a 3.5~ strength solution of a commercial poly-acrylate thickener in water are added with stirring to 44 parts by weight of the dispersion of the polyurethane resin (B1).
Example 3: Preparation of the aqueous coating com-position BMl by the process according to claim 1:
Stage I:
121.9 parts by volume of the base paint (A') of Examp e 1 and 49.6 parts by volume of the base paint (A'') o-Example 1 are mixed as component A), with inter.se stirring, with 351.1 parts by volume of component B) of Example 2 and 200 parts by volume of an isocyanate curing agent (Glassodur~ hardener "sehr kurz" [very short] from BASF ~acke+Farben based on 1,6-hexa-methylene diisocyanate) as component C). This gives the premix VMl.
Stage II:
The premix VMl is admixed, with intense stirring, with 463.4 parts by volume of rheological auxiliary (adjustment additive 93-E3 from Glasurit, based on an inorganic sodium-magnesium phyllosilicate thickener) as component D). This gives the intermediate mixture ZMl.
Finally, the intermediate mixture ZMl is admixed, with intense stirring, with 200 parts by volume of deionized water as component E). This gives the aqueous coating composition BMl.
CA 02246480 l998-08-l2 Example 4: Preparation of the aqueous coating com-position BM2 by the process according to claim 2:
Stage I:
121.9 parts by volume of the base paint (A') of Example 1 and 49.6 parts by volume of the base paint (A'') of Example l are mixed as component A), with intense stirring, with 351.1 parts by volume of component B) of Example 2 and 463.4 parts by volume of rheological auxiliary (adjustment additive 93-E3 from Glasurit) as component D). This gives the premix VM2.
Stage II:
The premix VM2 is admixed, with intense stirring, with 200 parts by volume of isocyanate curing agent (Glassodur~ hardener "sehr kurz~ [very short] from BASF
Lacke+Farben AG) as component C). This gives the intermediate mixture ZM2.
Finally, the intermediate mixture ZM2 is admixed, with intense stirring, with 200 parts by volume of deionized water as component E) This gives the aqueous coating 2s composition BM2.
Example 5: Application of the aqueous coating com-positions BM1 and BM2, and properties of the resulting f;n; ~h~E
Directly after the preparation of the aqueous coatlng compositions BM1 and BM2, they are sprayed (2 spray passes with HLVP or standard spray gun) by well-known metnods onto phosphated steel panels (bonder 132) coated with a commercial electrodeposition coating and a conventional (i.e. solvent-containing) or water-cor.taining surfacer, and are dried, following a flash-off time of 30 minutes, for a further 30 minutes at 60 degrees C The dry-film thickness of the aqueous coa~lng compositions BM1 and BM2 is from about 20 to 25 micrometers.
The resulting paint films are matt and of high scratcn resistance. In the context of the painting of vehicle interiors, the shade of the paint film can be matched precisely, by identical choice and combination of the base paints, to the shade of the vehicle exterior fir.ish, for which it is necessary to apply as further coating a 2-component clearcoat as topcoat (compare for example DE-A-41 10 520).
Claims (14)
1. Multistage process for the preparation of aqueous coating compositions BM for the painting of vehicle interiors, characterized in that I. a premix VM is prepared from:
a component A) containing at least one base paint (A) which comprises less than 5% by weight of water, at least one color and/or special-effect pigment, organic solvent, at least one water-dilutable or water-dispersible hydroxyl-containing binder resin and, optionally, auxiliaries and additives, a pigment-free aqueous component B) comprising at least one optionally hydroxyl-containing binder (B1), and a component C) consisting of a solution or dispersion of a di- and/or polyisocyanate (C1) or of a mixture of di- and/or polyisocyanates (C1), and in that subsequently:
II. the aqueous coating composition BM is prepared by admixing to the premix VM an aqueous solution or dispersion of a rheological auxiliary (D1) as component D), and finally the processing viscosity of the aqueous coating composition BM is established by adding deionized water as component E).
a component A) containing at least one base paint (A) which comprises less than 5% by weight of water, at least one color and/or special-effect pigment, organic solvent, at least one water-dilutable or water-dispersible hydroxyl-containing binder resin and, optionally, auxiliaries and additives, a pigment-free aqueous component B) comprising at least one optionally hydroxyl-containing binder (B1), and a component C) consisting of a solution or dispersion of a di- and/or polyisocyanate (C1) or of a mixture of di- and/or polyisocyanates (C1), and in that subsequently:
II. the aqueous coating composition BM is prepared by admixing to the premix VM an aqueous solution or dispersion of a rheological auxiliary (D1) as component D), and finally the processing viscosity of the aqueous coating composition BM is established by adding deionized water as component E).
2. Multistage process for the preparation of aqueous coating compositions BM for the painting of vehicle interiors, characterized in that I. a premix VM is prepared from:
a component A) containing at least one base paint (A) which comprises less than 5% by weight of water, at least one color and/or special-effect pigment, organic solvent, at least one water-dilutable or water-dispersible hydroxyl-containing binder resin and, optionally, auxiliaries and additives, a pigment-free aqueous component B) comprising at least one optionally hydroxyl-containing binder (B1), and an aqueous solution or an aqueous dispersion of a rheological auxiliary (D1) as component D), and in that subsequently:
II. the aqueous coating composition BM is prepared by admixing to the premix VM a solution or dispersion of a di- and/or polyisocyanate (C1) or of a mixture of di- and/or polyisocyanates (C1) as component C), and finally the processing viscosity of the aqueous coating composition BM is established by adding deionized water as component E).
a component A) containing at least one base paint (A) which comprises less than 5% by weight of water, at least one color and/or special-effect pigment, organic solvent, at least one water-dilutable or water-dispersible hydroxyl-containing binder resin and, optionally, auxiliaries and additives, a pigment-free aqueous component B) comprising at least one optionally hydroxyl-containing binder (B1), and an aqueous solution or an aqueous dispersion of a rheological auxiliary (D1) as component D), and in that subsequently:
II. the aqueous coating composition BM is prepared by admixing to the premix VM a solution or dispersion of a di- and/or polyisocyanate (C1) or of a mixture of di- and/or polyisocyanates (C1) as component C), and finally the processing viscosity of the aqueous coating composition BM is established by adding deionized water as component E).
3. Multistage process according to claim 1 or 2, characterized in that the water-dilutable or water-dispersible hydroxyl-containing binder resin of component A) comprises at least one water-dilutable or water-dispersible hydroxyl-containing polyacrylate resin (A2) having a hydroxyl number of between 5 and 40 mg of KOH/g and/or at least one water-dilutable or water-dispersible hydroxyl-containing, optionally acrylicized polyurethane resin (A1) having a hydroxyl number of between 20 and 100 mg of KOH/g.
4. Multistage process according to one of claims 1 to 3, characterized in that the base paints (A) present in component A) are free from water.
5. Multistage process according to one of claims 1 to 4, characterized in that the base paint (A) contains Aa) from 0.5 to 70% by weight of at least one special-effect pigment and/or at least one color pigment, Ab) from 10 to 80% by weight of at least one water-dilutable or water-dispersible, hydroxyl-containing binder, Ac) at least one organic solvent, and optionally Ad) auxiliaries and additives, the sum of the proportions by weight of components Aa) to Ad) making up in each case 100% by weight of component A).
6. Multistage process according to one of claims 1 to 5, characterized in that component A) comprises base paints (A') containing only special-effect pigments and base paints (A'') containing only color pigments.
7. Multistage process according to one of claims 1 to 6, characterized in that the binder (B1) of the aqueous pigment-free component B) contains at least one polyacrylate resin (A2) according to claim 3 and/or at least one optionally acrylicized polyurethane resin (A1) according to claim 3.
8. Multistage process according to one of claims 1 to 7, characterized in that the di- and/or polyisocyanates (C1) are isomers or isomer mixtures of aliphatic and/or cycloaliphatic and/or aromatic di- and/or polyisocyanates.
9. Multistage process according to one of claims 1 or 3 to 8, characterized in that in component D), as rheological auxiliaries (D1), phyllosilicates are employed.
10. Multistage process according to one of claims 1 to 9, characterized in that I. a premix VM of:
from 5 to 85% by weight, preferably from 10 to 75% by weight, of the pigment-containing component A), from 10 to 90% by weight, preferably from 15 to 85% by weight, of the binder-containing aqueous component B), and from 5 to 50% by weight, preferably from 10 to 40% by weight, of the component C) containing crosslinking agent is prepared, the sum of components A), B) and C) making up 100% by weight of the premix VM, and in that then:
II. the aqueous coating composition BM is prepared from:
from 10 to 95% by weight, preferably from 20 to 90% by weight, of the premix VM and from 5 to 90% by weight, preferably from 10 to 80% by weight, of the rheology-controlling component D), and in that finally the processing viscosity is established by adding de-ionized water as component E) to the coating composition BM .
from 5 to 85% by weight, preferably from 10 to 75% by weight, of the pigment-containing component A), from 10 to 90% by weight, preferably from 15 to 85% by weight, of the binder-containing aqueous component B), and from 5 to 50% by weight, preferably from 10 to 40% by weight, of the component C) containing crosslinking agent is prepared, the sum of components A), B) and C) making up 100% by weight of the premix VM, and in that then:
II. the aqueous coating composition BM is prepared from:
from 10 to 95% by weight, preferably from 20 to 90% by weight, of the premix VM and from 5 to 90% by weight, preferably from 10 to 80% by weight, of the rheology-controlling component D), and in that finally the processing viscosity is established by adding de-ionized water as component E) to the coating composition BM .
11. Multistage process according to one of claims 2 to 9, characterized in that I. a premix VM of:
from 5 to 85% by weight, preferably from 10 to 75% by weight, of the pigment-containing component A), from 10 to 90% by weight, preferably from 15 to 85% by weight, of the binder-containing aqueous component B), and from 5 to 85% by weight, preferably from 10 to 75% by weight, of the rheology-controlling component D) is prepared, the sum of components A), B) and D) making up 100% by weight of the premix VM, and in that then:
II. the aqueous coating composition BM is prepared from:
from 50 to 95% by weight, preferably from 60 to 90% by weight, of the premix VM and from 5 to 50% by weight, preferably from 10 to 40% by weight, of the component C) containing crosslinking agent, and in that finally the processing viscosity is established by adding deionized water as component E) to the coating composition BM.
from 5 to 85% by weight, preferably from 10 to 75% by weight, of the pigment-containing component A), from 10 to 90% by weight, preferably from 15 to 85% by weight, of the binder-containing aqueous component B), and from 5 to 85% by weight, preferably from 10 to 75% by weight, of the rheology-controlling component D) is prepared, the sum of components A), B) and D) making up 100% by weight of the premix VM, and in that then:
II. the aqueous coating composition BM is prepared from:
from 50 to 95% by weight, preferably from 60 to 90% by weight, of the premix VM and from 5 to 50% by weight, preferably from 10 to 40% by weight, of the component C) containing crosslinking agent, and in that finally the processing viscosity is established by adding deionized water as component E) to the coating composition BM.
12. Aqueous coating compositions BM prepared by the multistage process according to one of claims 1 to 11.
13. Use of the aqueous coating compositions BM according to claim 12 as water-based paint for the coating of vehicle interiors and/or of plastics components.
14. Use of the aqueous coating compositions BM according to claim 12 as automotive refinish paint for the coating of vehicle interiors and/or of plastics components.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19606022A DE19606022A1 (en) | 1996-02-19 | 1996-02-19 | Process for the production of aqueous coating compositions for painting vehicle interiors |
| DE19606022.2 | 1996-02-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2246480A1 true CA2246480A1 (en) | 1997-08-21 |
Family
ID=7785753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002246480A Abandoned CA2246480A1 (en) | 1996-02-19 | 1997-01-10 | Multi-stage method of producing aqueous paints for vehicle interiors |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0882102B1 (en) |
| JP (1) | JP2000504759A (en) |
| KR (1) | KR19990082668A (en) |
| CN (1) | CN1211271A (en) |
| AT (1) | ATE183223T1 (en) |
| BR (1) | BR9707569A (en) |
| CA (1) | CA2246480A1 (en) |
| DE (2) | DE19606022A1 (en) |
| WO (1) | WO1997030128A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19750451A1 (en) * | 1997-11-14 | 1999-05-27 | Herberts & Co Gmbh | Preparation of multicoat paint for metal and plastic substrate |
| DE19754182C2 (en) * | 1997-12-06 | 2001-09-06 | Herberts Gmbh | Aqueous sheet silicate dispersions and their use in the production of rheology-optimized aqueous coating media |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4143688B4 (en) * | 1991-03-30 | 2007-03-29 | Basf Coatings Ag | Use of a mixing system and process for the preparation of water-based paints and water-dilutable coating compositions |
| DE4232721A1 (en) * | 1992-09-30 | 1994-03-31 | Basf Lacke & Farben | Mixing system for the production of water-thinnable coating agents |
| DE4307498A1 (en) * | 1993-03-10 | 1994-09-15 | Herberts Gmbh | Modular system and its use in processes for the production of aqueous coating compositions |
-
1996
- 1996-02-19 DE DE19606022A patent/DE19606022A1/en not_active Withdrawn
-
1997
- 1997-01-10 EP EP97900588A patent/EP0882102B1/en not_active Expired - Lifetime
- 1997-01-10 KR KR1019980706414A patent/KR19990082668A/en not_active Application Discontinuation
- 1997-01-10 CN CN97192384A patent/CN1211271A/en active Pending
- 1997-01-10 WO PCT/EP1997/000091 patent/WO1997030128A1/en not_active Application Discontinuation
- 1997-01-10 BR BR9707569A patent/BR9707569A/en not_active Application Discontinuation
- 1997-01-10 DE DE59700332T patent/DE59700332D1/en not_active Expired - Fee Related
- 1997-01-10 JP JP9528920A patent/JP2000504759A/en active Pending
- 1997-01-10 AT AT97900588T patent/ATE183223T1/en not_active IP Right Cessation
- 1997-01-10 CA CA002246480A patent/CA2246480A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE19606022A1 (en) | 1997-08-21 |
| KR19990082668A (en) | 1999-11-25 |
| JP2000504759A (en) | 2000-04-18 |
| BR9707569A (en) | 1999-07-27 |
| EP0882102A1 (en) | 1998-12-09 |
| WO1997030128A1 (en) | 1997-08-21 |
| EP0882102B1 (en) | 1999-08-11 |
| CN1211271A (en) | 1999-03-17 |
| ATE183223T1 (en) | 1999-08-15 |
| DE59700332D1 (en) | 1999-09-16 |
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| FZDE | Discontinued |