WO2006094848A2

WO2006094848A2 - Aqueous paint compositions for wood

Info

Publication number: WO2006094848A2
Application number: PCT/EP2006/050229
Authority: WO
Inventors: Patrick GLÖCKNER; Andreas Wenning; Lutz Mindach; Werner Andrejewski
Original assignee: Degussa Gmbh
Priority date: 2005-03-10
Filing date: 2006-01-16
Publication date: 2006-09-14
Also published as: CN1942542A; WO2006094848A3; DE102005010967A1

Abstract

The invention relates to aqueous paint compositions for wood, consisting of at least one binding agent, one modified ketone/aldehyde resin and, optionally, auxiliary agents and additional substances.

Description

Aqueous paint compositions for wood

The invention relates to aqueous coating compositions for wood consisting of at least one binder, a modified ketone / aldehyde resin and optionally auxiliaries and additives.

The coating compositions are used for the exterior and interior painting of objects made of wood, wherein the coating is largely free of formaldehyde. The paint compositions are suitable for all customary application methods used in modern wood finishing. The coating compositions are characterized by a particularly high drying rate and by a particularly high hardness with very good elasticity and adhesion properties.

Wooden objects are usually provided with an organic coating (see "Römpp Lexikon, Lacke und Druckfarben, publisher Dr. Ulrich Zorll, Georg Thieme

Verlag, Stuttgart, 1998 ") in order to protect the wood on the one hand, depending on the field of application

(eg protection of the article from aging, plant or animal pests,

Weather conditions, water ingress, mechanical damage, pollution, etc.). On the other hand, the organic coatings take over decorative functions such. B. support structure and grain of the wood, compensate for defects, coloring or

Cover.

Both in the industrial wood refinement as well as in the home improvement sector, a quick drying of the paint is desirable to ensure rapid processing and defects caused by z. As soiling such as dust, dirt, insects, etc., to avoid.

To a sufficiently high level of protection against z. B. to ensure mechanical stress, the highest possible hardness of the coating is desired. However, elasticity decreases in conventional coatings with increasing hardness. However, good elastic properties are required because wooden objects are more or less soft and therefore deformable and z. B. by varying humidity of a constant volume change. Very good adhesion properties are indispensable for the permanent protection of the substrate. Hard resins based on ketones and aldehydes are known to increase the hardness of coating materials.

Water-dispersible condensation products of ketones and aldehydes or their derivatives or reaction products which may contain such products are described in EP 0 617 103 A1, EP 0838485, EP 0838486 (DE 19643704), DE 25 42 090, DE-OS 31 44 673 and DE-OS 3406474 (EP 0154835).

In DE-OS 25 42 090 sulfo groups carrying water-soluble compounds are described, which are available deviating from the process of the invention in a common condensation reaction of cycloalkanone, formaldehyde and alkali metal bisulfite.

In DE-OS 31 44 673 water-soluble condensation products are listed, which are also obtained by joint reaction of ketones, aldehydes and acid groups introducing compounds. Examples of the latter are sulfites, amidosulfonic acid, aminoacetic acid and phosphorous acid salts.

According to DE-OS 25 42 090 and DE-OS 31 44 673, products containing electrolyte (eg Na ions) are obtained. However, such resins, among other things, deteriorate the water resistance of coating systems.

EP 0 617 103 A1 describes the reaction of polyisocyanates (a) and dihydroxyl compounds (b) with a molecular weight of 500 to 5,000 which do not convert groups into ionic groups (eg carboxylic acid groups), but rather other functional groups such as ester groups. or ether groups (see page 3, lines 17-21). The polyurethane thus obtained is still with a compound (c) which contains not only NCO-reactive groups nor a group convertible into an ionic group, and optionally with diols or polyols (d) having a molecular weight of 60 to 500, which are no further functional Wear groups (see page 4, lines 5 to 15), implemented. Subsequently, this reaction product is reacted with a condensation resin and transferred to the aqueous phase.

In DE 3406474 (EP 0154835) are aqueous dispersions of ketone resins or Ketone / aldehyde resins using organic protective colloids. The disadvantage that protective colloids remain in the subsequent coating and can adversely affect properties such as resistance to water and moisture, prevents their use in high-grade coating compositions.

EP 0838485 describes esterified products. It is known that ester groups hydrolyze, whereby polymer degradation takes place and the storage stability is adversely affected. In addition, a reaction or incompatibility with pigments can be caused by freely accessible acid groups.

EP 0838486 describes aqueous resin dispersions obtainable by reaction or proportionate

Implementation of

I. hydroxyl-containing ketone, ketone / aldehyde, urea / aldehyde resins or their hydrogenated derivatives and II. At least one hydrophilic modified isocyanate and / or polyisocyanate having at least one free NCO group, obtainable by reacting at least one isocyanate and / or polyisocyanate with compounds which, in addition to the hydrophilic or potentially hydrophilic group, have at least one isocyanate-reactive function and which have a hydrogen active according to the Zerewitinoff test, and at least one hydrophilic group and / or a potentially hydrophilic group, and subsequent blending of the neutralized resin with water.

The object of the present invention was to find aqueous coating compositions for the exterior and interior painting of objects made of wood, wherein the coating should be largely free of formaldehyde. The coating compositions should have a high rate of drying and high hardness with good elasticity and adhesion properties of the dried film.

The object underlying the invention has surprisingly been achieved by the use of special coating compositions which are described in more detail below. The invention relates to aqueous coating compositions for the exterior and interior painting of objects made of wood, wood materials, such. As medium density fiberboard (MDF) or high density fiberboard (HDF), or wood-like objects, such. B. wood-laminated or wood-veneered articles, substantially comprising A) 20 to 95 wt .-% of at least one aqueous binder, and B) 5 to 80 wt .-% of a hydrophilized ketone / aldehyde resin and / or a hydrophilized, hydrogenated ketone / aldehyde resin, and C) 0 to 75 wt .-% of at least one additive, wherein the sum of the weights of component A) to C) is 100 wt .-%.

It has been found that the combination of the coating compositions described below from components A) to C) fulfill all the required criteria.

Component A)

The aqueous binders A) essential to the invention are used in amounts of from 20 to 95% by weight, preferably from 30 to 80% by weight.

Preference is given to aqueous binders from the group of polyurethanes, polyacrylates, polyethers, polyesters, alkyd resins, cellulose ethers, derivatives of cellulose, polyvinyl alcohols and derivatives, rubbers, maleate resins, phenol / urea-aldehyde resins, aminoplasts (for example melamine, benzoguanamine resins ), Epoxy acrylates, epoxy resins, silicic acid esters and alkali metal silicates (eg waterglass) and / or silicone resins. The aqueous binders may be foreign and / or self-crosslinking, air-drying (physically drying) and / or oxidatively curing.

Component B)

The component B) essential to the invention is used in amounts of from 5 to 80% by weight, preferably from 10 to 60% by weight.

As component B) are aqueous resin dispersions obtainable by reaction or proportionate reaction of I. hydroxy-containing ketone / aldehyde resins or their hydrogenated derivatives and

II. At least one hydrophilic modified isocyanate and / or polyisocyanate having at least one free NCO group, obtainable by reacting at least one isocyanate and / or polyisocyanate with compounds which have at least one isocyanate-reactive function in addition to the hydrophilic or potentially hydrophilic group, and then Mixing of the optionally neutralized resin with water.

Suitable ketones for the preparation of the ketone / aldehyde resins (component I) are all ketones, in particular acetone, acetophenone, methyl ethyl ketone, heptanone-2, pentanone-3, methyl isobutyl ketone, cyclopentanone, cyclododecanone, mixtures of 2,2,4- and 2, 4,4-Trimethylcyclopentanon, cycloheptanone and cyclooctanone, cyclohexanone and all alkyl-substituted cyclohexanones having one or more alkyl radicals having a total of 1 to 8 hydrocarbon atoms, individually or in mixture. As examples of alkyl-substituted cyclohexanones, mention may be made of 4-tert-amylcyclohexanone, 2-sec-butylcyclohexanone, 2-tert-butylcyclohexanone, 4-tert-butylcyclohexanone, 2-methylcyclohexanone and 3,3,5-trimethylcyclohexanone.

It is in principle also possible, although less preferred, to use ketones which have other functional groups, such as. B. amino and / or acid groups grout.

In general, however, all in the literature for ketone and ketone / aldehyde resin syntheses called suitable ketones, usually all C-H-acidic ketones, can be used. Preferred are ketone / aldehyde resins based on acetophenone, cyclohexanone, 4-tert-butylcyclohexanone, 3,3,5-trimethylcyclohexanone and heptanone alone or in a mixture.

As aldehyde component of the ketone / aldehyde resins (component I.) are in principle unsubstituted or branched aldehydes, such as. As formaldehyde, acetaldehyde, n-butyraldehyde and / or iso-butyraldehyde, valeric aldehyde and dodecanal. In general, all the aldehydes mentioned in the literature as suitable for ketone / aldehyde resin syntheses can be used. Preferably, however, formaldehyde is used alone or in mixtures. The required formaldehyde is usually used as about 20 to 40 wt .-% aqueous or alcoholic (eg, methanol or butanol) solution. Other uses of formaldehyde such. As well as the use of para-formaldehyde or trioxane are also possible. Aromatic aldehydes, such as. B. benzaldehyde may also be included in admixture with formaldehyde.

As starting compounds for the ketone / aldehyde resins of component I, particular preference is given to using acetophenone, cyclohexanone, 4-tert-butylcyclohexanone, 3,3,5-trimethylcyclohexanone and also heptanone alone or in a mixture and formaldehyde.

The resins of ketone and aldehyde can also be hydrogenated in the presence of a suitable catalyst with hydrogen at pressures of up to 300 bar. In this case, part of the carbonyl groups of the ketone / aldehyde resin is converted into secondary hydroxyl groups. For resins of aldehydes and ketones, in addition to the Carbonylgruppierung on other hydrogenatable functions such. B. have aromatic structures, these other structures can be converted by suitable hydrogenation. In the case of z. B. aromatic structures are obtained cycloaliphatic structures.

The possibly necessary hydrophilic modification takes place for. Example by reacting the resin I with a component IL, consisting of at least one hydrophilic modified isocyanate and / or polyisocyanate having at least one free NCO group, obtainable by reacting at least one isocyanate and / or polyisocyanate with compounds in addition to the hydrophilic or potentially hydrophilic group - d. H. such groups, only after

Neutralization hydrophilic - have at least one isocyanate-reactive function such. B. hydroxy or amino groups.

Examples of such compounds for the hydrophilic modification of (poly) isocyanates are amino acids, hydroxysulfonic acids, aminosulfonic acids and hydroxycarboxylic acids. Preference is given to using dimethylolpropionic acid or derivatives thereof. The hydrophilic modification can also be carried out with non-ionic groups (eg with polyethers) or already neutralized compounds.

Hydroxycarboxylic acids, in particular dimethylolpropionic acid, therefore become particularly preferred because it neutralizes with volatile bases such. As amines, show strong hydrophilic effect, after evaporation of the volatile base, however, this effect decreases greatly. Coatings therefore do not lose by z. B. Moisture their protective function, as a swelling does not take place.

The dimethylolpropionic acid is also particularly preferred because it has its two

Hydroxyl groups two hydrophobic polyisocyanates (potentially) can modify hydrophilic.

Suitable polyisocyanates for the preparation of II. Are preferably di- to tetrafunctional polyisocyanates. Examples thereof are cyclohexane diisocyanate, methylcyclohexane diisocyanate, ethylcyclohexane diisocyanate, propylcyclohexane diisocyanate, methyldiethylcyclohexane diisocyanate, phenylene diisocyanate, tolylene diisocyanate, bis (isocyanatophenyl) methane, propane diisocyanate, butane diisocyanate, pentane diisocyanate, hexane diisocyanate, such as hexamethylene diisocyanate (HDI) or 1,5-diisocyanato-2 methylpentane (MPDI), heptane diisocyanate, octane diisocyanate, nonane diisocyanate such as 1,6-diisocyanato-2,4,4-trimethylhexane or 1,6-diisocyanato-2,2,4-trimethylhexane (TMDI), nonanetriisocyanate such as 4-isocyanatomethyl -l, 8-octane diisocyanate (TIN), decane and triisocyanate, undecanediisocyanate and triisocyanate, dodecandi- and triisocyanates, isophorone diisocyanate (IPDI), dicyclohexylmethane-4,4'-diisocyanate (H ₁₂ MDI), isocyanatomethylmethylcyclohexyl isocyanate, 2,5 (2,6) -bis (isocyanato-methyl) -bicyclo [2.2.1] heptane (NBDI), 1,3-bis (isocyanatomethyl) cyclohexane (1,3-H ₆ -XDI) or 1,4 Bis (isocyanatomethyl) cyclohexane (1,4-H ₆ -XDI) a alone or in mixture.

Another preferred class of polyisocyanates are the compounds prepared by di- or trimerization, allophanatization, biuretization and / or urethanization of the simple diisocyanates with more than two isocyanate groups per molecule, for example the reaction products of these simple diisocyanates, such as IPDI, HDI and / or H. ₁₂ MDI with polyhydric alcohols (eg glycerol, trimethylolpropane,

Pentaerythritol) or polyvalent polyamines or the triisocyanurates obtainable by trimerization of the simple diisocyanates such as IPDI, HDI and H ₁₂ MDI.

Particularly preferred is a hydrophilically modified polyisocyanate (II) Dimethylolpropionic acid or derivatives thereof and IPDI and / or TMDI and / or H ₁₂ MDI and / or HDI in mol ratio 1: 2.

The preparation of component B) is carried out in the melt or in solution of a suitable organic solvent, which - if desired - can be separated by distillation after preparation.

Preferred solids contents in the case of a reaction in solution are 30 to 95 wt .-%, particularly preferably 60 to 80 wt .-%.

Suitable auxiliary solvents are low-boiling inert solvents used with

Water at least over wide areas do not form a miscibility gap, have a boiling point at atmospheric pressure below 100 ° C and therefore, if desired, by distillation easily to a residual content of less than 2 wt .-% and in particular of less than 0.5 wt .-% based on the Separate finished dispersion or aqueous solution and reuse. Suitable solvents of this type are for. As acetone, methyl ethyl ketone or tetrahydro-uranium. Basically suitable are also higher-boiling solvents such. As n-butyl glycol, di-n-butyl glycol and N-methylpyrrolidone, which then remain in the dispersion.

However, one advantage of component B) lies precisely in the fact that it is possible completely to dispense with organic solvents in the finished aqueous resin dispersion and still obtain solids-rich, stable dispersions.

The reaction of I and II is preferably allowed to proceed so far that a residual NCO content of 1% NCO (determined according to DIN 53185) is exceeded, and particularly preferably progress so far that the residual NCO content of the product I and II is in the range of 0.1 to 0.5% NCO. In the reaction of I and II unreacted remaining NCO functions can be, according to the prior art, either too

Chain extension reactions, e.g. B. by adding polyamines or water, or possibly a chain termination by addition to NCO groups monofunctional

Initiate compounds (eg monoalcohols, monoamines).

The products of the invention can in the case of potentially hydrophilic groups with a suitable neutralizing agent are added, whereby water-dilutable, water-dispersible or water-soluble products are then obtained.

The neutralization of the potentially hydrophilic groups of the resins according to the invention can be carried out with inorganic and / or organic bases, such as. As ammonia or organic amines. Preferably used are primary, secondary and / or tertiary amines, such as. For example, ethylamine, propylamine, dimethylamine, dibutylamine, cyclohexalamine, benzylamine, morpholine, piperidine and triethanolamine. Particularly preferred are volatile, tertiary amines, in particular dimethylethanolamine, diethylethanolamine, 2-dimethylamino-2-methyl-1-propanol, triethylamine, tripropylamine and tributylamine in the case of anionic potential groups. So-called cationic potential ionic groups can be neutralized with inorganic and / or organic acids, such as. As acetic acid, formic acid, phosphoric acid, hydrochloric acid, etc.

The degree of neutralization is preferably 50 to 130% of the neutralization amount necessary for stoichiometric neutralization.

The neutralized hydrophilic resin or the resin solution is either passed into water or it is preferably mixed with water while stirring. Before addition of water, the reaction product of I and II may optionally be combined with other non-hydrophilic resins or other components and then dispersed together. By this measure, a technically advantageous high solids content of the dispersions of over 45 wt .-% can be achieved. Basically, the solids content ranges between 20 and 70 wt .-%, preferably between 25 and 60 wt .-%.

After dispersing, the organic auxiliary solvent can preferably be removed in vacuo and, if appropriate, worked up again.

Component C) Component C) is used in amounts of from 0 to 75% by weight, preferably from 5 to 60% by weight.

Suitable as component C) are auxiliaries and additives, for example inhibitors, organic solvents, surface-active substances, oxygen and / or radical initiators, catalysts, light stabilizers, color whiteners, photosensitizers and initiators, additives for influencing theological properties, such as, for example, As thixotropic and / or thickening agents, leveling agents, anti-skinning agents, plasticizers, defoamers, antistatic agents, lubricants, wetting and dispersing agents, preservatives such. As well as fungicides and / or biocides, thermoplastic additives, dyes, pigments, matting agents, fire protection equipment, internal release agents, fillers, Isocyanathärter and / or blowing agents.

Preparation of the Lackzusammcsctzungcn from the components A) to C):

The paint compositions are prepared by intensive mixing of the components at temperatures of 20 to 80 ° C ("Textbook of Lacktechnologie", Th. Brock, M. Groteklaes, P. Mischke, ed. V. Zorll, Vincentz Verlag, Hannover, 1998, Page 229 ff.).

Non-liquid components may be first dissolved in suitable solvents or water prior to mixing, then the remaining components are added with stirring. In the case of z. As pigments and / or fillers is carried out a dispersion.

The formaldehyde content of the coating compositions is below 100 ppm, preferably below

50 ppm, and more preferably below 10 ppm.

The claimed, aqueous coating compositions are suitable for the exterior and interior painting of objects made of wood, wood-based materials or wood-like objects. They have a high rate of drying and thus very high blocking resistance.

The dried, cured or crosslinked films have a high hardness with good elasticity and adhesion properties, which is z. B. in good to very good values in the scratch adhesion or pendulum or Buchholzhärte expresses. Penetration and substrate wetting on various wood and wood materials and abrasion resistance are very good. In addition, these films have a high solvent resistance. The claimed aqueous coating compositions have a perfect course on the wood substrates used and are free of surface defects, such as craters and wetting disorders.

The claimed aqueous coating compositions have a solids content of 15% to 80%, preferably from 20% to 60%.

The paint compositions according to the invention are used as fillers, putties, impregnations, wood coatings such. As glazes, primers, primers, fillers, base and topcoats for wood and / or wood-like substrates used.

The following examples are intended to further illustrate the invention but not to limit its scope:

Examples

Preparation of component B)

1. Preparation of the adduct

444 g of isophorone diisocyanate are added with stirring to a mixture of 134 g of dimethylolpropionic acid, 380 g of acetone and 6 g of a 10% strength by weight solution of dibutyltin dilaurate in acetone so that the exothermic reaction remains readily controllable. It is heated to 60 ° C and held this temperature up to an NCO number of 9.2%. To the cooled to room temperature solution is added with stirring, 2300 g of a 55% strength by weight acetone solution of hydrogenated acetophenone / formaldehyde resin (synthetic resin SK Degussa AG) and 12 g of a 10 wt .-% acetone DBTL solution and heated to the reflux temperature of about 60 ° C. The mixture is allowed to stir at this temperature until the NCO number of the solution has fallen below 0.1% NCO.

2. Transfer to the aqueous phase

Alternative A: The solution of the hydrophilically modified resin prepared under 1) is neutralized at room temperature with stirring by adding 89 g of dimethylaminoethanol and the solution is dispersed by adding 4200 g of demineralized water with stirring. The auxiliary solvent acetone and water in part is removed in vacuo and receives a storage-stable, finely divided, slightly opalescent resin dispersion having a solids content of about 33 wt .-%.

Alternative B: The solution prepared under 1) is added with stirring 3300 g of a 55 wt .-% strength acetone solution of a hydrogenated acetophenone / formaldehyde resin (resin SK Degussa AG), neutralized at room temperature with stirring with 89 g of dimethylaminoethanol and dispersed Solution by adding 4400 g of demineralized water with stirring. The auxiliary solvent acetone and water as a proportion are removed in vacuo and obtain a storage-stable whitish dispersion having a solids content of about 50 wt .-%.

Properties of the dispersions Storage stability

The dispersions A and B according to point 2) were examined for storage stability with regard to changes in the pH, the viscosity and the visual appearance.

* Rotational Viscosimeter: D: 100 to 900 s ^"

Example of a paint composition:

The components are mixed with vigorous stirring under the dissolver and homogenized for 10 min.

VE H2O = fully desalinated water All data in grams / g

The lacquers were applied with a doctor blade to pine wood panels and glass plates in layer thicknesses of 200 μm and dried at room temperature.

All films are flawless and free of surface defects.

Knife scratch adhesion on pine wood panels:

10 0 = very good adhesion; 10 = no liability

Diagram 1 shows the differences as of when the paints are dust-dry. It can be seen that with increasing proportion of component B, the drying rate increases significantly.

Diagram 1: Necessary time until paints are dust-dry Diagram 2 shows the evolution of the surface hardness (pendulum hardness according to König). It can be seen that with increasing proportion of component B the pendulum hardness increases significantly.

0 1 2 3 4 5 6 7 8

Time / days Diagram 2: Development of the pendulum hardness of the different coatings as a function of time

Claims

claims:

Aqueous paint composition for the coating of articles of wood substantially comprising A) 20 to 95 wt .-% of at least one aqueous binder, and B) 5 to 80 wt .-% of a hydrophilized ketone / aldehyde resin and / or a hydrophilicized , hydrogenated ketone / aldehyde resin, and C) 0 to 75 wt .-% of at least one additive, wherein the sum of the weights of component A) to C) is 100 wt .-%.

2. Aqueous paint composition according to claim 1, characterized in that the solids content of the coating compositions between 15 wt .-% to 80 wt.

%, the formaldehyde content of the coating compositions is below 100 ppm, preferably below 50 ppm and particularly preferably below 10 ppm, and the content of organic solvents is below 20% by weight, preferably below 10% by weight, particularly preferably below 2% by weight. lies.

3. Aqueous paint composition according to claims 1 and 2, characterized in that as component A) aqueous binders from the group of polyurethanes, polyacrylates, polyethers, polyesters, alkyd resins, cellulose ethers, derivatives of cellulose, polyvinyl alcohols and derivatives, rubbers, Maleinatharze, phenol -/Urea-

Aldehyde resins, aminoplasts (e.g., melamine, benzoguanamine resins), epoxy resins, silicic acid esters and alkali silicates (e.g., water glass), silicone resins, fluorine-containing polymers may be used alone or in admixture.

4. Aqueous paint composition according to claim 3, characterized in that as component A) preferred, aqueous binder foreign and / or self-crosslinking, air-drying (physically drying) and / or oxidatively curing.

5. Aqueous paint composition according to any one of the preceding claims, characterized in that as component B) aqueous resin dispersions are used, obtainable by

Reaction or proportional reaction of I. hydroxy-containing ketone / aldehyde or their hydrogenated derivatives and

II. At least one hydrophilic modified isocyanate and / or polyisocyanate having at least one free NCO group, obtainable by reacting at least one

Isocyanate and / or polyisocyanate with compounds which in addition to the hydrophilic or potentially hydrophilic group have at least one isocyanate-reactive function, and subsequent mixing of the optionally neutralized resin with water.

6. Aqueous paint composition according to claim 5, characterized in that as component I for the preparation of component B) resins are used which contain C-H-acidic ketones.

7. Aqueous paint composition according to claim 6, characterized in that CH-acidic ketones selected from acetone, acetophenone, methyl ethyl ketone, heptanone-2, pentanone-3, methyl isobutyl ketone, cyclopentanone, cyclododecanone, mixtures of 2,2,4- and 2,4 , 4-trimethylcyclopentanone, cycloheptanone and

Cyclooctanone, cyclohexanone and all alkyl-substituted cyclohexanones having one or more alkyl radicals having a total of 1 to 8 hydrocarbon atoms, used individually or in admixture.

8. Aqueous paint composition according to claim 7, characterized that are used as alkyl-substituted cyclohexanones 4-tert-amylcyclohexanone, 2-sec-butylcyclohexanone, 2-tert-butylcyclohexanone, 4-tert-butylcyclohexanone, 2-methylcyclohexanone and 3,3,5-trimethylcyclohexanone alone or in mixture.

9. Aqueous paint composition according to claim 5, characterized in that as component I for the preparation of component B) resins are used which contain aldehydes.

10. Aqueous paint composition according to any one of the preceding claims, characterized in that as aldehyde component for the preparation of component I of component B) formaldehyde, acetaldehyde, n-butyraldehyde and / or iso-butyraldehyde, valeric aldehyde, dodecanal used alone or in mixtures become.

11. Aqueous paint composition according to any one of the preceding claims, characterized in that hydrogenation products of the resins of acetophenone, cyclohexanone, 4-tert-butylcyclohexanone, 3,3,5-trimethylcyclohexanone, heptanone alone or in a mixture and

Formaldehyde be used as component I.

12. Aqueous paint composition according to any one of the preceding claims, characterized in that the component II. Of component B) is prepared using tert.

Amino alcohols, aminocarboxylic acids, hydroxysulfonic acids, aminosulfonic acids or / and hydroxycarboxylic acids.

13. Aqueous paint composition according to any one of the preceding claims, characterized in that the component II. Of component B) is prepared using Dimethylolpropionic.

14. Aqueous paint composition according to any one of the preceding claims, characterized in that the component II. Of component B) is already neutralized before reaction with component I.

15. Aqueous paint composition according to any one of the preceding claims, characterized in that are used for the preparation of II. Of component B) di- to tetrafunctional polyisocyanates.

16. Aqueous paint composition according to any one of the preceding claims, characterized in that for the preparation of II. Of component B) polyisocyanates having aromatic, aliphatic and / or cycloaliphatic bound isocyanate groups or mixtures thereof are used.

17. Aqueous paint composition according to any one of the preceding claims, characterized in that 1-isocyanato-3.3.S-trimethyl-S-isocyanatomethylcyclohexane (isophorone diisocyanate; IPDI), trimethylhexamethylene diisocyanate (TMDI), 1,6-diisocyanatohexane (HDI), bis (4- Isocyanatohexyl) -methane (H ₁₂ MDI) can be used alone or in a mixture.

18. Aqueous paint composition according to any one of the preceding claims, characterized in that are used for the preparation of II. Of component B) polyisocyanates with biuret, uretdione or isocyanurate structure.

19. Aqueous paint composition according to one of the preceding claims, characterized that for the preparation of II. Component B) polyisocyanates from the reaction of polyhydric alcohols and / or amines are used with monomeric isocyanates.

20. Aqueous paint composition according to any one of the preceding claims, characterized in that for the preparation of II. Of component B) dimethylolpropionic acid and isophorone diisocyanate, trimethylhexamethylene diisocyanate, 1,6-diisocyanatohexane and / or bis (4-isocyanatohexyl) methane in a molar ratio of 1: 2 become.

21. Aqueous paint composition according to any one of the preceding claims, characterized in that the reaction of I. and II. The component B) and the subsequent dispersion in the substance or in the presence of an auxiliary solvent.

22. Aqueous paint composition according to the preceding claim, characterized in that the auxiliary solvent used has a boiling point below 100 ° C at 1013 hPa.

23. Aqueous paint composition according to the preceding claim, characterized in that the auxiliary solvent used is acetone or / and methyl ethyl ketone or / and tetrahydro-uranium.

24. Aqueous paint composition according to any one of the preceding claims, characterized in that the neutralization of component B) is carried out with inorganic or organic bases.

25. Aqueous paint composition according to the preceding claim, characterized in that for neutralization dimethylethanolamine and / or diethylethanolamine and / or 2

Dimethylamino-2-methyl-1-propanol can be used.

Aqueous paint composition according to any preceding claim, characterized in that for neutralization 50 to 130% of the amount of neutralization necessary for stoichiometric neutralization is used.

27. Aqueous paint composition according to any preceding claim, characterized in that one or more non-water-soluble or water-dilutable components are added before the addition of water.

28. Aqueous paint composition according to any preceding claim, characterized in that auxiliaries and additives are used as component C).

29. Aqueous paint composition according to any preceding claim, characterized in that as component C) auxiliaries and additives are used alone or in a mixture selected from the group of inhibitors, organic solvents, surface-active substances, oxygen and / or radical scavengers, catalysts, Light stabilizers, color whiteners, photosensitizers and initiators, additives for influencing theological properties such. B. thixotropic agents and / or

Thickening agents, leveling agents, anti-skinning agents, defoamers, plasticizers, antistatic agents, lubricants, wetting and dispersing agents, preservatives such. As well as fungicides and / or biocides, thermoplastic additives, dyes, pigments, matting agents, fire protection equipment, internal release agents, fillers, Isocyanathärter and / or blowing agents.

30. A process for the preparation of aqueous coating compositions containing substantially

A) 20 to 95 wt .-% of at least one aqueous binder, and B) 5 to 80 wt .-% of a hydrophilized ketone / aldehyde resin and / or a hydrophilized, hydrogenated ketone / aldehyde resin, and

C) 0 to 75 wt .-% of at least one additive, wherein the sum of the weights of component A) to C) is 100 wt .-%, by intensive mixing by stirring and / or dispersing the components

Temperatures from +20 to +80 ° C.

31. Use of the aqueous coating compositions according to at least one of the preceding claims for the coating of objects.

32. Use of the aqueous coating compositions according to at least one of the preceding claims for the painting of objects made of wood, wood materials, such. As medium density fiberboard (MDF) or high density fiberboard (HDF), or wood-like objects, such. As wood-laminated or -furnierten objects.

33. Coated wooden objects, wood-based materials, such as. As medium-density fiberboard (MDF) or high density fiberboard (HDF), or wood-like objects such. As wood-laminated or -furnierte objects, prepared and / or finished with a paint composition according to at least one of the preceding claims.