SI9200187A - Method for the preparation of water soluble laquer adhesives and use thereof - Google Patents

Abstract

The invention relates to a process for production water-soluble binders for varnishes and their use when formulating water - soluble fillers for car painting. The binders contain po by neutralizing carboxyl groups, a water-soluble product reactions of a polyurethane resin containing carboxyl groups and at least one blocked end isocyanate group (polycarboxyl component), with polyester, bearing hydroxyl groups (polohydroxyl component) and the cross-linking component. With especially selection of binder components and specials by the process of combining these components of the binder further improvements in stability can be achieved polishes in storage.

Description

PROCEDURE FOR THE OBTAINING OF WATER-SOLVED BINDING MATERIALS AND THEIR USE

The invention relates to a process for the production of water-soluble binders for varnishes and their use in the formulation of kiln-dried varnishes, in particular water-soluble coatings for car lacquers.

The binders comprise, after neutralization of the carboxyl groups, a water-soluble reaction product of polyurethane resin (polycarboxyl component) with carboxyl groups and at least one blocked end isocyanate group, with polyester (polyhydroxyl component) bearing hydroxyl groups and a crosslinking component.

Combinations of a binder of polycarboxyl, polyhydroxyl and crosslinking components are described e.g. in ATPS 328 587, AT-PS 388 738, AT-PS 388 382, and EP-A2-0330139.

Such combinations of binders will achieve favorable usable rheological properties of the varnishes and very good adhesion of the oven-dried varnish films on a metal or primed substrate and good adhesion between individual coatings. In this way, the formulation of high-quality water-soluble coatings such as those used in the automotive industry will be possible.

The requirements for water-soluble coatings, as set by users in industrial practice, are constantly changing, and great efforts are required to offer as many versatile products as possible.

It is therefore surprising to find that further improvements in the stability of stored varnishes can be achieved through a specific selection of binder components and through specific combining processes.

The present invention therefore relates to a process for the production of water-soluble binders containing a reaction product from one polycarboxyl component with one polyhydroxyl component and a cross-linking component, characterized in that (A) 10 to 80% by weight, and in particular 15 to 40% by weight a polyurethane resin containing carboxylic groups with an acid number of 70 to 160 mg KOH / g and at least one terminal, blocked isocyanate group per molecule, having neither free hydroxyl groups nor fatty acid residues of more than 12 carbon atoms, with a viscosity limit of 6 , 5x10 to 12.0x10 m ³ / kg oz. in particular 8,0xl0 ³ to ΙΙ, ΟχΙΟ ' ³ m ³ / kg measured in N, N-dimethylformamide (DMF) at 20 ° C, (B) reacts with 20 to 90, in particular 60 to 85% by weight of polyester resin, in in the present case, modified with urethane, having a hydroxyl number of 50 to 500 mg KOH / g, an acid number of less than 20 mg KOH / g and a limit viscosity of 8.0x10 ³ to 13.0x10 ' ³ m ³ / kg, or. better 9.5x10 ' ³ to 12.0x10' ³ m ³ / kg, measured in Ν, dim-dimethylformamide (DMF) at 20 ° C, at 90 to 170 ° C, or. especially at a temperature of 10 to 20 ° C above the temperature required to separate the blocking agent of the final isocyanate groups of component (A) up to a limit viscosity of 13,5x10 ' ³ to ΐδ, οχίο' ³ m ³ / kg , in particular from 14.5x10 ' ³ to 16.5x10' ³ m ³ / kg, measured in Ν, dim-dimethylformamide (DMF) at 20 ° C without exceeding the water solubility limit, and immediately thereafter ( I) 60 to 90% by weight of this reaction product before or after partial or complete neutralization of the carboxylic groups with an inorganic or organic base, but before adding a substantial portion of water (II) at a temperature of 40 to 100 ° C, mix with 10 to 4 0% by weight of the component for non-water-soluble crosslinking and dilute with water to the concentration of solids required for further processing, the sums of percentages for the Composition of the combination of (A) and (B) or. of (I) and (II) relative to a solid always equal to 100.

The invention further relates to water-soluble binders for lacquers obtained by the process of the invention and their use in the formulation of water-soluble kiln-dried varnishes, in particular for the formulation of water-soluble coatings (Primer Surfacer) for car lacquering.

By additionally, by hydrolysis, the persistent coupling of the polycarboxyl component (A) with the polyhydroxyl component (B) via the urethane group, by selecting specific raw materials for the polycarboxyl component (A) to improve the compatibility of the reaction product (I) with the crosslinking component (II) and by mixing components for crosslinking prior to the addition of a substantial portion of water, the stability of varnishes formulated with a combination of binders obtained by the process of the invention will be greatly enhanced, which is of particular importance for use in industrial lacquer systems with circular conduit systems.

In addition, higher proportions of cross-linking components can be used in combination of binders compared to products at the same stage of technological development. No separation of the individual components of the varnish was found during the storage of the varnishes. The possibility of such an effect on the reactivity of varnishes in an extended area can, if necessary, also improve the adhesion between individual coatings of kiln-dried films.

The polyurethane resin used as the polycarboxylic component (A) contains dihydroxymonocarboxylic acid as the specific raw material and has, according to the requirements of the carboxylic group, an acid number of 70 to 160 mg / g and at least one blocked isocyanate end group in each molecule. By definition, component (A) does not contain either hydroxyl groups or fatty acid residues with more than 12 carbon atoms. The blocking agent will be at an elevated temperature, i.e. at the reaction temperature required for coupling with the polyhydroxyl component (B), cleavage. The polycarboxyl component (A) is itself, like the product of reaction (I), formed after compound (A) and (B), after partial or complete neutralization of the carboxyl groups with the base, in particular secondary or tertiary alkyl or alkanol amine , water-soluble.

The polyurethane resin will be obtained in a known manner by conversion of a mixture of polyisocyanate and with monohydroxyl compounds and / or butanonoxime of partially blocked polyisocyanate with dihydroxymonocarboxylic acid and optionally polyol, whereby the quantitative proportions of the component A must be chosen, which is free of hydroxyl groups contains on average at least one blocked end isocyanate group.

Dimethylolpropionic acid will be used primarily as dihydroxymonocarboxylic acid. In principle, other dihydroxymonocarboxylic acids are also suitable.

In particular, conventional commercial diisocyanates, such as toluylenediisocyanate, isophorondiisocyanate or hexamethylenediisocyanate, and optionally isocyanate polymers, will be used as polyisocyanate compounds.

To block free NCO groups, we select monohydroxyl compounds, especially monoalcohols such as 2-ethylhexanol, glycol monoethers and polyoxyalkylene diols or butanonexime, so that when the polycarboxyl component (A) is converted with the polyhydroxyl component (B), 80 and maximum 160 ° C. The polycarboxyl component (A) has a viscosity limit of 6.5x10 ' ³ to 12.0xl0' ³ m ³ / kg, primarily 8.0xl0 ' ³ to ΙΙ, ΟχΙΟ' ³ m ³ / kg, measured in N, N-dimethylformamide (MF) at 20 ° C.

As the polyhydroxyl component (B) will be applied to the polyester resin to form a film, which is characterized by a hydroxyl number of 50 to 500 mg KOH / g, an acid number of less than 20 mg KOH / g and a cut viskozitetno number of 8,0xl0 ^'3 to 13,0x10 ' ³ m ³ / kg, and in particular from 9,5x10' ³ to 12,0x10 ' ³ m ³ / kg, measured in N, N-dimethylformamide (DMF) at 20 ° C. Polyester resins derived from polyols and polycarboxylic acids may optionally have urethane groups and may be modified with monocarboxylic acids having from 5 to 20 carbon atoms. The fatty acid content, however, should not exceed 15% by weight.

Components (A) and (B) react at 90 to 170 ° C, and in particular at a temperature lying 10 to 20 ° C above the separation temperature of the blocking agent of the final isocyanate groups in the polycarboxyl component (A) to a limit of viscosity of 13.5x10 ' ³ to 18,0x10' ³ m ³ / kg, primarily 14,5x10 * ³ to 16,5x10 ³ m ³ / kg, measured in N, N-dimethylformamide (DMF) at 20 ° C, with ensure that the product of reaction (I) must be completely water-soluble after neutralization of the carboxyl groups. Quantitative ratios vary by solid between 10 and 80% by weight, and in particular between 15 and 4 0% by weight in component (A) and between 2 0 and 9 0% by weight, and in particular between 60 and 85% by weight in component ( B), where the sum of the percentages must always be 100. The ratios must be chosen so that the product of reaction (I) has an acid number of at least 25 mg KOH / g, and in particular between 30 and 50 mg KOH / g.

The reaction product (I) immediately thereafter before or after partial or complete neutralization of the carboxyl groups by inorganic or organic bases, but before addition of a substantial portion of water, mix with a non-water soluble crosslinking component (II) and dilute with water to a solid content so that it is suitable for further processing.

The crosslinked (II) component will be used in pre-conventional blocked diisocyanates or blocked polyisocyanates with as little organic solvents as possible. Multiple blocked di- or polyisocyanates can be advantageously used to regulate the surface strength and flexibility of oven-dried varnish films, especially in the combination of soft and hard types in a ratio of 10 to 35% by weight versus 90 to 65% by weight. % By fuzzy types we mean first of all such products derived from aliphatic di- or polyisocyanates by biuret formation or oligomerization, e.g. from hexamethylenediisocyanates. For the solid types, the di-or polyisocyanates used are cycloaliphatic or aromatic hydrocarbon residues used as the basic products. Examples of such diisocyanates include toluylenediisocyanate, tetramethylxylenediisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, isophorondiisocyanate.

In addition, water-soluble blocked polyisocyanates can be used as components of the crosslinking component (II). It is advisable to mix such blocked polyisocyanates after the aforementioned dilution with water.

Secondary or tertiary alkyl or alkanol amine are used primarily as the bases for neutralizing the carboxyl groups in reaction product (I).

The quantitative ratios of the reaction product (I) and the curing component (II) range between 60 and 90 wt. % (I) and 10 to 40 wt. % (II), where the sum of the percentages must always be 100.

Further processing of binders for lacquers obtained by the process according to the invention is carried out in a known manner. The products are primarily used as binders for water-soluble coatings, especially for car paint.

The examples illustrate the invention without limiting its scope. All data in fractions or percentages refer to

Ί Units of mass, unless otherwise stated.

In the cases, the following abbreviations are used

DGM diethylenglycoldimethyl ether MIBK methylisobutyl ketone TDI toluylenediisocyanate EEW (conventional commercial mixture of isomers with ca 80% 2,4-TDI and ca. 20% 2,6-TDI) epoxy weight equivalent

Acquisition of polycarboxyl components

Component (Al): In a suitable reaction vessel, prepare a solution of 810 parts (6 moles) of dimethylolpropionic acid in 946 parts of DGM and 526 parts of MIBK. A mixture of 870 parts (5 moles) of TDI and 528 parts (2 moles) of TDI, semi-blocked with ethylene glycol monoethyl ether, was added simultaneously to the solution at 100 ° C for 4 hours. As soon as the NCO groups are converted, the mixture is diluted with a mixture of DGM and MIBK (2: 1) to a solids content of 6 0%. Component (Al) has an acid number of 14 0 mg KOH / g and a limit viscosity of 9.3x10 m / kg, measured in N, N-dimethylformamide (DMF) at 20 ° C.

Semi-blocked TDI is obtained by adding 9 0 parts (1 mol) of ethylene glycol monoethyl ether to 174 parts (1 mol) of TDI over two hours at a temperature of 3 0 ° C and reacting to a NCO value of 16 to 17%.

Component (A2): In the same manner as in (Al), 945 parts (7 moles) of dimethylolpropionic acid react in 1079 parts of DGM and 599 parts of MIBK with 1044 parts (6 moles) of TDI and 528 parts (2 moles) with ethylene glycol monoethyl ether of semi-blocked TDI . Component (A2) contains 60% solids, has an acid number of 140 mg KOH / g and a limit viscosity of 10.2x10 ' ³ m ³ / kg, measured in N, N-dimethylformamide (DMF) at 20 ° C. Component (A3): In the same manner as in (Al), a mixture of 270 parts (2 mol) of dimethylolpropionic acid and 118 parts (1 mol) of hexanediol in 361 parts of DGM and 181 parts of MIBK is added over 4 hours at 100 ° C. 348 parts (2 moles) of TDI and 522 parts (2 moles) of TDI semi-blocked with butanonexime and allowed to react until all NCO groups were converted. The solids content was then adjusted to 60% by DGM / MIBK (2: 1).

Component (A3) has an acid number of 89 mg KOH / g and a limit viscosity of 9.7x10 0 ³ m ³ / kg, measured in N, N-dimethylformamide (DMF) at 20 ° C.

Semi-blocked TDI is obtained by adding 69 parts (2 mol) of butanonoxime to 696 parts (4 mol) of TDI over 2 hours at a temperature of 30 ° C and reacting to a NCO value of 28 to 29%.

Acquisition of polyhydroxyl components

Component (BI): 130 parts (1.1 mol) of 1,6-hexane diol, 82 parts (0.6 mol) of monopentaerythritol, 8 parts (0.05 mol) of isononic acid, 28 parts (0) are esterified in a suitable reaction vessel. , 1 mol) of castor fatty acid (dehydrated castor acid) and 50 parts (0.3 mol) of isophthalic acid at 210 ° C to an acid number of less than 4 mg KOH / g. The viscosity of the 50% solution in ethylene glycol monobutyl ether according to DIN 5321l / 20 ° C is 125 seconds, and the limit viscosity measured in N, N-dimethylformamide at 20 ° C is 9.8x10 0 ³ m ³ / kg.

Component (B2): In the same manner as in (BI), 38 parts (0.2 mol) of tripropylene glycol, 125 parts (1.2 mol) of neopentyl glycol, 28 parts (0.1 mol) of isomerized linoleic acid, 83 parts (0) , 5 mol) of isophthalic acid and 58 parts (0.3 mol) of trimellitic acid anhydride at 230 ° C to an acid number of less than 4 mg KOH / g. The viscosity of the 50% solution in ethylene glycol monobutyl ether is 165 seconds according to DIN 53211/20 ° C. The viscosity limit value is 10,5x10 0 ³ m ³ / kg, measured in N, N-dimethylformamide at 20 ° C.

Component (B3): 259 parts (1.35 mole) of tripropylene glycol, 8 parts (0.05 mole) of isononic acid, 42 parts (0.15 mole) of isomerized linoleic acid, 68.5 parts (0.5 mole) of monopentaerythritol and 175 parts (1.05 mol) of isophthalic acid are esterified in the presence of 0.5 parts of dibutyl stanodilaurate at 220 ° C to an acid number of 4 mg KOH / g. The viscosity of the 7% ethylene glycol monobutyl ether solution according to DIN 5321l / 20 ° C is 120 seconds. After dilution with 260 parts of methyl ethyl ketone at 7 0 ° C, 7 0 parts {0.4 mol) of TDI was added over 3 hours. The temperature is maintained at this altitude until all NCO groups are converted. The methylethylketone was removed in vacuo and then the mixture was diluted with methoxypropoxypropanol to a solids content of 93%. The viscosity of the 42% solution in ethylene glycol monobutyl ether according to DIN 532ll / 20 ° C is 58 seconds. The viscosity limit value measured at N, N-dimethylformamide at 20 ° C is 12, 10 x ³ m ³ / kg.

Component (B4): 259 parts (1.35 mole) of tripropylene glycol, 25 parts (0.15 mole) of isophthalic acid and 97 parts (0.5 mole) of trimellitic anhydride are esterified in the presence of 0.2 parts of dibutyl stanodylurate at 220 ° C to acid number 15 mg KOH / g. The viscosity of the 50% solution in ethylene glycol monobutyl ether according to DIN 5321l / 20 ° C is 60 seconds. The limit viscosity measured in Ν, dim-dimethylformamide at 20 ° C is 11,4x10 ′ ³ m ³ / kg.

Acquisition of the binding component (I)

According to the quantitative ratios in Table 1, the polycarboxyl component (A) is mixed with the polyhydroxyl component (B) and the existing solvent is largely vacuum removed during heating to the indicated reaction temperature. The temperature is maintained at this height until the desired acid number and limit viscosity are reached. A test is made in which the sample, after neutralization with dimethylethanol amine, must be water-soluble. The components are immediately further processed in accordance with Examples 1 to 4.

Table 1 (all quantities indicated refer to solids)

Reaction Component Product (A) defov / type

Component (B) parts / type

Temperature Acid [η] 2) Reactions Ώ no. _m 3 _{/ kg} mg KOH / g

1/1 35 (Al) 65 (WOULD) 150 - 160 'C 41 - 45 16.7 xlO 1/2 30 (A2) 70 (B2) 150 - 160 ° C 35 - 39 16.0 xlO 1/3 40 (A3j 60 (B3) 150 - 160 ° C 29 - 32 14.9 Χ10 1/4 23 , 16.1). 77 (B41 150 - 160 ° C 33 - 37 15,8x10

1) The reaction takes place in ca. 90% solution in DGM

2) Viscosity limit Number measured in N, N-dimethylform du (DMF) at 20 ° C.

Examples 1-4:

According to the data in Table 2, the reaction product (I) at 40100 ° C is mixed with the crosslinking component (II) and the dimethylethanol amine is adjusted to a given degree of neutralization. Neutralization of reaction product (I) is also possible before addition of the crosslinking component (II). The mixture is then diluted with deionized water.

We used as a component for networking (II):

C 1 conventional butanonexime-blocked polyisocyanate (trimeric hexamethylenediisocyanate with isocyanurate structure), e.g. Desmodur ¹ ^ N 3390, Bayer.

IC 2 conventional butanonexime-blocked polyisocyanate (trimeric hexamethylene-di-isocyanate biuret struc ture), e.g. Desmodur

N 100, Bayer.

Table 2 (All quantity indications refer to solids)

Example Parts reaction product / type Cross-linking component (II) parts / type The rate neutral- zation Solids content after dilution with H2O 1 70 (VI) 30 / C 1 90% 35% 2 65 (1/2.) 35 / C 1 90% 35% 3 70 (1/3) 30 / C 2 95% 35% 4 70 (1/4) 30 / C 2 90% 34%

Testing the stability of a transparent lacquer based on the binder of Example 4 during storage

Stability has been tested with aqueous clearcoats. For comparison, a clear lacquer based on Example 3 of EP-A2-0 330 139 was used.

Composition and characteristic values of clear lacquers transparent lacquer binder of Example 4/34% binder of Example 3

EP-A2-0 330 139 / 47.6% water neutralizing agent solids content viscosity (pa.s)

100

0.12 Pa.s

49,8

0.4

0.12 Pa.s

Transparent varnishes are stored in sealed bottles at 40C. The results of the experiment are given in Table 3.

Table 3

transparent lacquer A 1 B 1 at the start of the experiment pH value 8.3 8.1 viscosity (Pa. s) 0.12 0.12 appearance slightly milky slightly milky after 1 week pH value 7.9 - viscosity (Pa. s) 0, 09 - appearance slightly milky 2-phase after 2 weeks pH value 7.9 - viscosity (Pa · s) 0, 09 - appearance slightly milky - after 3 weeks pH value 7.8 - viscosity 0.08 - appearance slightly milky -

Testing of binders of the present invention as car covers

The binders of Examples 1 to 4 and Example 3 of EP-A2-0 330 139 are formulated as automotive coatings.

286 parts of binder (35% concentration) 50 parts of titanium oxide (rutile) parts of barium sulfate 10 parts of microwave

0.2 parts of pigment from carbon black 13.8 parts of water

The varnishes have a solids content of ca. 50%, pH value ca. 8.0 (adjusted with dimethylethanol amine) and a viscosity of ca. 0.12 Pa.s / 20 ° C.

The covers apply with a pneumatic gun at approx. 20 µm thick coating of the foundation, which was cathodic extracted by electroplating onto a steel sheet previously treated with zinc phosphate.

Hardening of the coatings takes place in an air circulation oven for 20 minutes at 140, 160, or. 180 ° C. In all cases, a dry film thickness of 35 ± 2 μm is achieved.

A coat of alkyd and melamine resin based car coating is applied to the coating of the coating, which is cured for 3 minutes at 135 ° C (the dry film thickness is 35 ± 2 pn).

The durability of the films (resistance to solvents and water) and mechanical values meet the requirements in practice for all types of coatings.

Impact resistance is tested with SPLITT (= Single Projectile Launching Impact17)

Tester). The method is described extensively in FARBE + LACK, Volume 8/1984. In our test, the impact angle was 5 ° and the diameter of the 0.5 g ball was 3 mm. The speed of hitting the balls was 100 km / h. at temperatures of + 20 ° C and (mostly circular) damage surface, the exposed layer (B forearm / filler).

The test pieces were tested at -20 ° C. The table shows

O _e damage in mm m at site - sheet metal, G - foundation, F The test results are given in Table 4. There are no significant differences between the individual results.

from

EP-A20330139

Table 4

The car.

example based coatings

SPLITT ' 140 ° C 5 - 8 / G 4 - 6 / G 4 - 7 / G 4 - 6 / G 7 - 10 / G at +20 ° 160 ° C 4 7 / G / F 2 - 4 / G 3 5 / G / F 1 / G 5. 8 / G C 180 ° C 4 7 / G / F 2 - 4 / G 3 5 / G / F 1 / G 5 - 8 / b / f SPLITT ' 140 ° C 5 - 8 G 3 - 5 / G J - 5 / G 2 - 4 / G 7 - 10 / G at -20 ⁰ 160 ° C 5 - 8 / B / G 2 - 3 / G 4 5 / G / F 1 / G 6 - 11 / B / G C 180 ° C 5 - 8 / B / G, Ψ 3 / G 4 - 5 / B / G / F 1 / G 8 - 12 / B / G / F

VIANOVA KUNSTHARZ AG

Claims (9)

Patent claims A process for the preparation of water-soluble lacquer binders comprising a reaction product between a polycarboxyl and polyhydroxyl component and a crosslinking component, characterized in that (A) 10 to 80% by weight, and in particular 15 to 40% by weight of the polyurethane resin, which contains carboxylic groups with an acid number of 70 to 160 mg KOH / g and at least one terminal, blocked isocyanate group per molecule, but has neither free hydroxyl groups nor fatty acid residues of more than 12 carbon atoms, with a limit viscosity of 6,5x10 to 12 , 0x10 m ³ / kg oz. in particular 8,0xl0 ' ³ to ΙΙ, ΟχΙΟ ³ m ³ / kg, measured in N, N-dimethylformamide (DMF) at 20 ° C, reacts with, (B) 20 to 90, in particular 60 to 85% by weight of polyester resin, in optionally modified by urethane, having a hydroxyl number of 50 to 500 mg KOH / g, an acid number of less than 20 mg KOH / g, and a limit number viskozitetnim 8,0xl0 ^'3 to 13,0xl0 ³ m ³ / kg respectively. better 9.5x10 ³ to 12.0x10 ' ³ m ³ / kg, measured in N, N-dimethylformamide (DMF) at 20 ° C, at 90 to 170 ° C, respectively. in particular at a temperature of 10 to 20 ° C above the temperature required to separate the blocking agent of the final isocyanate groups of component (A) to a limit of viscosity of 13,5x10 ' ³ to 18,0x10 ³ m ³ / kg, in particular from 14,5x10 ³ to 16,5x10 ³ m ³ / kg, measured in N, N-dimethylformamide (DMF) at 20 ° C, without exceeding the water solubility limit, and immediately thereafter (I) 60 up to 90% by weight of this reaction product before or after partial or complete neutralization of the carboxyl groups with an inorganic or organic base, but before addition of a substantial portion of water at a temperature of 40 to 100 ° C is mixed with (II) 10 - 40 wt. % of the cross-linking component other than water soluble at 20 and diluted with water to a concentration of solids suitable for further processing, with the sum of the percentages of the expressed constituents of combination (A) and (B) or. (I) and (II) relating to a solid always 100. Process according to claim 1, characterized in that the component (A) is a polyurethane resin obtained by the conversion of a mixture of polyisocyanate and with monohydroxyl compounds and / or butanonoxime of a partially blocked polyisocyanate with a dihydroxymonocarboxylic acid zinc case polyol. Process according to claim 2, characterized in that dimethylolpropionic acid was used as the dihydroxymonocarboxylic acid. Process according to Claim 2, characterized in that component (B) is a polyester resin containing up to 15% by weight of monocarboxylic acids with 5 to 20 carbon atoms. Method according to claims 1 to 4, characterized in that the quantitative ratios between the components (A) and (B) are chosen such that the product of reaction (I) has an acid number of at least 25 mg KOH / g or. better 30 to 50 mg KOH / g. Method according to claim 1, characterized in that the blocked diisocyanates and / or blocked polyisocyanates and / or combinations of both are used as the crosslinking component (II). Water-soluble lacquer binders, characterized in that they contain a reaction product between a polycarboxyl and a polyhydroxyl component and a crosslinking component, and that they are produced according to claims 1 to 6. Use of lacquer binders manufactured according to claims 1 to 6 for the preparation of water-soluble, kiln-dried varnishes. Use of lacquer binders manufactured according to claims 1 to 6 for the formulation of water soluble coatings (fillers), in particular for car lacquering.