Universal slip and flow control additives with recoatable quality

Abstract

A universal slip and levelling additive having a recoatable or reprintable property contains polyoxyalkylene-polysiloxane copolymers of general formula (I)

##STR00001##

wherein R.sup.1=identical and/or different alkyl radicals having 1 to 8 carbon atoms, preferably having 1-4 carbon atoms, particularly preferably having 1 or 2 carbon atoms; R═R.sup.1 and/or —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, where p=2, 3 or 4, with the proviso that at least one R═—C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]—; R.sup.2=alkyl radical having 1 to 3 carbon atoms; n≥45; m=1 to 5; and wherein x and y are selected such that the molecular weight of the polyoxyalkylene block [(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y] is >3000 g/mol and the molar weight ratio of x to y is <0.8.

Claims

1: A universal slip and levelling additive having a recoatable or reprintable property, comprising a polyoxyalkylene-polysiloxane copolymer of general formula (I) ##STR00004## wherein R.sup.1=identical and/or different alkyl radicals having 1 to 8 carbon atoms, R═R.sup.1 and/or —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, where p=2, 3 or 4, with the proviso that at least one R═—C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, R.sup.2=alkyl radical having 1 to 3 carbon atoms, n≥45, m=1 to 5, and wherein x and y are selected such that an average molecular weight of the polyoxyalkylene block —[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]— is >3000 g/mol and a molar weight ratio of x to y is <0.8.

2: The slip and levelling additive according to claim 1, wherein the radical R.sup.2 is a methyl radical.

3: A method of producing a coating composition, the method comprising: mixing the slip and levelling additive according to claim 1 into a coating composition, wherein the coating composition is a solvent-containing, solvent-free or water-based coating, or a printing ink.

4: The method according to claim 3, wherein the polyoxyalkylene-polysiloxane copolymer is used in an amount from 0.001 to 5.0% by weight, based on the composition.

5: A coating composition, comprising a universal slip and levelling additive having a recoatable or reprintable property, wherein the slip and levelling additive comprises a polyoxyalkylene-polysiloxane copolymer of general formula (I) ##STR00005## wherein R.sup.1=identical and/or different alkyl radicals having 1 to 8 carbon atoms, R═R.sup.1 and/or —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, where p=2, 3 or 4, with the proviso that at least one R═—C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, R.sup.2=alkyl radical having 1 to 3 carbon atoms, n≥45, m=1 to 5, and wherein x and y are selected such that a molecular weight of the polyalkylene block —[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]— is >3000 g/mol and a molar weight ratio of x to y is <0.8.

6. (canceled)

7: The coating composition according to claim 5, wherein the polyoxyalkylene-polysiloxane copolymer is used in an amount from 0.001 to 5.0% by weight, based on the coating composition.

8: The slip and levelling additive according to claim 1, wherein in the general formula (I), R.sup.1 is an alkyl radical having 1 or 2 carbon atoms.

9: The slip and levelling additive according to claim 1, wherein in the general formula (I), n≥60.

10: The slip and levelling additive according to claim 1, wherein in the general formula (I), x and y are selected such that the molar weight ratio of x to y is <0.75.

11: The method according to claim 4, wherein the polyoxyalkylene-polysiloxane copolymer is used in an amount from 0.01-3.0% by weight, based on the composition.

12: The coating composition according to claim 5, wherein in the general formula (I), R.sup.1 is an alkyl radical having 1 or 2 carbon atoms.

13: The coating composition according to claim 5, wherein in the general formula (I), n≥60.

14: The coating composition according to claim 5, wherein in the general formula (I), x and y are selected such that the molar weight ratio of x to y is <0.75.

15: The coating composition according to claim 7, wherein the polyoxyalkylene-polysiloxane copolymer is used in an amount from 0.01-3.0% by weight, based on the coating composition.

16: The coating composition according to claim 5, wherein the coating composition is a solvent-containing, solvent-free or water-based coating, or a printing ink.

Description

[0013] The object of the invention, therefore, is to provide slip and levelling additives having improved scratch resistance, increased surface slip analogous to those from the prior art, but universally applicable and in this case having at the same time recoatability and reprintability, without impairing the optical varnish/paint finish by insufficient wetting or the like.

[0014] Moreover, a deliberate targeted limitation of the range described can result in application-optimized products which to date have not been found in abundance in the known ranges.

[0015] To achieve the object, therefore, proposed are universal slip and levelling additives having recoatable or reprintable property, comprising polyoxyalkylene-polysiloxane copolymers of general formula (I)

##STR00002##

R.sup.1=Identical and/or different alkyl radicals having 1 to 8 carbon atoms, preferably having 1-4 carbon atoms, particularly preferably having 1 or 2 carbon atoms,
R═R.sup.1 and/or —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, where p=2, 3 or 4, with the proviso that at least one
R═—C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]—,
R.sup.2=alkyl radical having 1 to 3 carbon atoms,
n≥45, preferably n≥50, particularly preferably n>60,
m=1 to 5.
wherein x and y are selected such that the average molecular weight of the polyoxyalkylene block —[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]— is >3000 g/mol and the molar weight ratio of x to y is <0.8, preferably <0.75.

[0016] Preferably with the proviso that n is not greater than 500, preferably not greater than 300 and particularly preferably not greater than 200.

[0017] Preferably with the proviso that the average molecular weight of the polyoxyalkylene block —[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]— is less than 10000 g/mol, preferably less than 8000 g/mol and particularly preferably less than 5000 g/mol.

[0018] Preferably with the proviso that the molar weight ratio of x to y is not less than 0.05, preferably not less than 0.1 and particularly preferably not less than 0.2.

[0019] It Is evident to a person skilled in the art that the copolymers obtained are in the form of a mixture, the distribution of which is substantially determined by statistics. The values for x, y, p and n, m therefore correspond to average values.

[0020] Of essential significance for the properties of the polyoxyalkylene-polysiloxane copolymers are the numerical values of the indices n and m. n specifies the number of methylalkylsiloxy units and determines the chain length of the copolymers. In the polyoxyalkylene-polysiloxane copolymers to be used in accordance with the invention, n has numerical values of n≥45, preferably n≥50, particularly preferably n>60. Preferably with the proviso that n is not greater than 500, preferably not greater than 300 and particularly preferably not greater than 200. It is a familiar concept to a person skilled in the art that the compounds are in the form of a mixture having a distribution which is governed substantially by statistics. The value of n is therefore the average value of the number of methylalkylsiloxy units.

[0021] The polysiloxanes used in accordance with the invention are generally prepared by a platinum-catalyzed addition reaction of a siloxane comprising a silane hydrogen atom with a linear polyoxyalkylene oxide polyether, wherein the linear chain is blocked at one end by an alkyleneoxy group (such as allyloxy or vinyloxy) and has been capped, for example, with an alkoxy, aralkyloxy or acyloxy group at the other end, as in accordance with the following equation:

XSiH+H.sub.2C═CHCH.sub.2OR.sup.3.fwdarw.XSiCH.sub.2CH.sub.2CH.sub.2OR.sup.3

[0022] The polysiloxanes according to the invention are known in principle. Further preparation processes are disclosed in EP 0785240 B1.

[0023] In accordance with the invention, the polyoxyalkylene blocks consist of oxyethylene and oxypropylene units, preferably starting from ethylene oxides and propylene oxides, wherein the average molecular weight of the polyoxyalkylene blocks is >3000 g/mol. The molar weight ratio of the oxyethylene units to the oxypropylene units, expressed by the ratio x:y, is <0.8, preferably <0.75.

[0024] Surprisingly, it has now been found that

(i) polysiloxanes, having a chain length of n≥45, preferably n≥50, particularly preferably n>60,
(ii) a specifically selected average molecular weight of the polyoxyalkylene block [(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y] of >3000 g/mol,
(iii) a specifically selected molar weight ratio of oxyethylene to oxypropylene units x to y is <0.8, preferably <0.75 and
(iv) with the use of so-called endcapped polyalkylene oxide-polyethers are capable of producing slip and levelling additives with excellent typical properties of surface slip and scratch resistance and are also recoatable.

[0025] The boundary condition formulated in (Iv) does not exclude residual amounts of uncapped polyethers (i.e. R.sup.2 is hydrogen) as a result of the preparation which may be present in certain cases in a proportion of up to 10% in endcapped polyethers.

[0026] The slip and levelling additives according to the invention meet more than two important performance properties. They improve the levelling and the slip effect and at the same time they also enable recoatability and reprintability of the coatings and printing inks.

[0027] The polyoxyalkylene-polysiloxane copolymers in the slip and levelling additives according to the invention preferably comprise the radical R.sup.2=methyl radicals.

[0028] The polyoxyalkylene-polysiloxane copolymers particularly preferably comprise exclusively pendant modifications where R═—C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, where p=2, 3 or 4.

[0029] The pendant-modified polyoxyalkylene-polysiloxane copolymers according to the invention preferably comprise α- and ω-terminal modification of alkyl radicals.

[0030] A further aspect of the invention is the use of the slip and levelling additives in coating compositions, wherein the coating compositions are solvent-containing, solvent-free or water-based paints, or printing ink.

[0031] It Is possible to use polyoxyalkylene-polysiloxane copolymers preferably in amounts from 0.001 to 5.0% by weight, preferably 0.01-3.0% by weight, based on the coating compositions.

[0032] The invention further provides for the use of polyoxyalkylene-polysiloxane copolymers of general formula (I)

##STR00003##

R.sup.1=Identical and/or different alkyl radicals having 1 to 8 carbon atoms, preferably having 1-4 carbon atoms, particularly preferably having 1 or 2 carbon atoms,
R═R.sup.1 and/or —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, where p=2, 3 or 4, with the proviso that at least one
R═—C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]—,
R.sup.2=alkyl radical having 1 to 3 carbon atoms.
n≥45, preferably n≥50, particularly preferably n>60,
m=1 to 5,
wherein x and y are selected such that the molar weight of the polyoxyalkylene block —[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]— is >3000 g/mol and the molar weight ratio of x to y is <0.8, preferably <0.75, as universal slip and levelling additives having recoatable and reprintable property.

[0033] Preference is given to the use of polyoxyalkylene-polysiloxane copolymers of the general formula (I), preferably with the proviso that n is not greater than 500, particularly preferably not greater than 300 and very particularly preferably not greater than 200.

[0034] Preference is given to the use of polyoxyalkylene-polysiloxane copolymers of the general formula (I), preferably with the proviso that the average molecular weight of the polyoxyalkylene block —[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]— is less than 10000 g/mol, preferably less than 8000 g/mol and particularly preferably less than 5000 g/mol.

[0035] Preference is given to the use of polyoxyalkylene-polysiloxane copolymers of the general formula (I), preferably with the proviso that the molar weight ratio x to y is not less than 0.05, preferably not less than 0.1 and particularly preferably not less than 0.2.

[0036] With regards to the specific conditions chosen for the polyoxyalkylene-polysiloxane copolymers, reference is made to the aforementioned detail.

[0037] Preference is given to using the polyoxyalkylene-polysiloxane copolymers having exclusively pendant modifications where R═—C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, where p=2, 3 or 4.

[0038] Particular preference is given to using the pendant-modified polyoxyalkylene-polysiloxane copolymers according to the invention having α- and ω-terminal modifications of alkyl radicals.

[0039] The polyoxyalkylene-polysiloxane copolymers are preferably used for producing coating compositions.

[0040] Preferably, 0.001 to 5.0% by weight, preferably 0.01-3.0% by weight polyoxyalkylene-polysiloxane copolymers, based on the coating composition, are used.

[0041] The examples which follow are provided merely to elucidate this invention to those skilled in the art and do not constitute any limitation of the claimed subject matter or the claimed process whatsoever.

[0042] Measurement Methods:

[0043] Parameters or measurements are preferably determined using the methods described herein below. In particular, these methods were used in the examples of the present intellectual property right.

[0044] Slip Resistance Value G (cN)

[0045] To measure the surface slip a test method has proven of value in which the friction force is measured. The method is carried out by means of a Bluehill instrument from Instron.

[0046] FIG. 1 shows a schematic representation of the test method.

[0047] A 500 g weight with defined felt underlay is drawn uniformly across the coating surface by a tensile tester. The force required for this purpose is measured with an electronic force transducer. The test is carried out at a constant speed of 12 mm/sec and enables a reproducible measurement with high precision. The lower the slip resistance value G (cN), the higher the surface slip of the coating surface.

[0048] Scratch Resistance

[0049] The mechanical resistance of a coating surface to visible damage by a moving hard object touching the surface is known as scratch resistance. The object used here is the finger nail. With the upper surface of the finger nail at an angle of 45° the coating surface is scratched 5 times under reasonable pressure, wherein the direction of scratch is away from the assessor. To assess the scratch value, a standard sample and samples to be tested are subjected to the same assessor. Subsequently, damage to the coating surface is visually assessed. For this purpose, the standard sample is compared with the sample to be tested.

[0050] The assessment employs the following scale:

TABLE-US-00001 0= corresponds to the standard sample (without additive) −= worse than standard sample += better than standard sample

[0051] Application

[0052] The respective coating compositions are applied on wood panels using a 120 μm 4-sided film applicator. The wood panels thus coated are dried for 2 hours at room temperature (RT), 2 hours at 40° C. and then a further 24 hours at RT. Subsequently, a second coating is applied to the dried first coating from the previous day in analogy to that described above. The wood panels with two coating layers are dried for 2 hours at room temperature, 2 hours at 40° C. and then a further 7 days at RT (applied wood plate).

[0053] Adhesion is assessed by cross-cut/tear off of adhesive tape. A good adhesion value is GT=0. A poor value is GT=5.

[0054] Recoatability

[0055] The recoatability is determined via the adhesion values by means of cross-cut in accordance with DIN EN ISO 2409. For this purpose, the adhesion of two coatings applied to each other is determined.

[0056] Haptic Property and Touch

[0057] The haptic property is the subjective perception of the surface nature of a coating. For this purpose, the fingertips are stroked uniformly across the coated wood panels. Since this is a subjective test, the test is always carried out by the same assessor and compared with one another. For this purpose, a standard sample is used as direct comparison.

[0058] The assessment employs the following 3-level scale:

TABLE-US-00002 0= corresponds to the standard sample (without additive) −= worse than standard sample += better than standard sample

WORKING EXAMPLES

[0059] 1. Slip and Levelling Additives Based on Polyoxyalkylene-Polysiloxane Copolymers

[0060] Table 1 shows inventive examples 1-3 and comparative examples (CE) 4-12.

[0061] As comparative examples CE 4-8, the block copolymers according to EP 0285807 A2 or EP 0 785 240 B1 and CE 9-11 according to CN 108047452 were produced and used for the performance test.

[0062] In addition, commercially available levelling additives were used as further comparative examples CE 7 (Tego Glide 410, Evonik) and CE 8 (Borchi® Gol OL 17, Borchers) for the performance test. These comprise polyether-modified polysiloxanes according to product data sheets.

[0063] Preparation of the inventive Slip and Levelling Additives 1-3

[0064] The siloxanes, polyethers are initially charged in a flask provided with stirrer, thermometer, gas inlet and reflux condenser (see Table 1). Nitrogen is passed through the apparatus and the flask contents are heated to 80-100° C. while stirring. At this temperature, a platinum catalyst (ca. 2 to 4 ppm) is added to the mixture. An exothermic reaction sets in. In this case, depending on the reactants used, temperature increases of 10 to 30° C. occur. The mixtures are left to react and Si—H conversions of ≥97% are achieved (determined by hydrogen releasable with n-butanol in an alkaline medium). During the reaction, the initially turbid flask contents becomes clear. Reaction times are generally 1 to 8 hours.

[0065] The polyethers are preferably used in excess (30 to 60%). The reaction described above can also be carried out using solvents which is then particularly advantageous if high-viscosity products are formed. In this case, solvents can be used which can be distilled off after the reaction (e.g. toluene, xylene) or those which can remain in the end product after the reaction (e.g. dipropylene glycol, di- and tripropylene glycol mono-n-butyl ether, propylene glycol monophenyl ether, double bond-free polyethers).

TABLE-US-00003 TABLE 1 Slip and levelling additives Slip and levelling Position of modification of additive Reference —C.sub.pH.sub.2pO[C.sub.2H.sub.4O).sub.x(C.sub.2H.sub.6O).sub.y]R.sup.2 R 1 inventive pendant —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, CH.sub.3 2 inventive terminal —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, CH.sub.3 3 inventive pendant and terminal —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2 CE 4 EP 0 265 807 A2 non-inventive pendant and terminal —C.sub.PH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2 CE 5 EP 0 785 240 B1 non-inventive terminal —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, CH.sub.3 CE 6 EP 0 785 240 B1 non-inventive terminal —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, CH.sub.3 CE 7 Tego ® Glide 410 non-inventive — CE 8 Borchi ® Gol OL 17 non-inventive — CE 9 CN 108047452 non-inventive pendant —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, CH.sub.3 CE 10 CN 108047452 non-inventive pendant —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, CH.sub.3 CE 11 CN 108047452 non-inventive Pendant —C.sub.pH.sub.2pO[(C.sub.2H.sub.4O).sub.x(C.sub.3H.sub.6O).sub.y]R.sup.2, CH.sub.3 Slip and Molar weight levelling Polyoxyalkylene additive R.sup.1 R.sup.2 p n m x/y block Appearance 1 CH.sub.3 CH.sub.3 3 72 3.9 0.73 >3000 clear 2 CH.sub.3 CH.sub.3 3 47 2 0.73 >3000 clear 3 CH.sub.3 CH.sub.3 3 58 1 0.73 >3000 clear CE 4 CH.sub.3 H 3 60 0.3 1.35 1400-3000 clear CE 5 CH.sub.3 CH.sub.3 3 48 1 2.85 <800 clear CE 6 CH.sub.3 CH.sub.3 3 39 1 2.85 <800 clear CE 7 — — — — — — — clear CE 8 — — — — — — — clear CE 9 CH.sub.3 CH.sub.3 3 72 3.9 2.03 3300 cloudy, brownish CE 10 CH.sub.3 CH.sub.3 3 98 1 1.56 1100 cloudy, grey brown, dark sediment CE 11 CH.sub.3 CH.sub.3 3 98 1 0.67 600 cloudy, greyish, dark sediment

[0066] 2. Performance Testing

[0067] 2.1 Solvent-Containing Wood Coating 1 [0068] A stock coating without hardener is firstly prepared according to Table 2. For this purpose, the constituents are mixed with a Dispermat for 10 minutes at 1000 rpm. [0069] For the performance test, 0.35 g of an additive according to Table 1 are added to 50 g of stock coating and homogenized for 1 minute at 500 rpm using a Dispermat (additized stock coating). [0070] 2.9 g of hardener are weighed and re-homogenized with 25 g or additized stock coating for 1 minute at 500 rpm using a Dispermat. The wood coating 1 thus prepared is applied to a wood panel which is used for the performance test.

TABLE-US-00004 TABLE 2 Solvent-containing wood coating - formulation 1 Weight [g] Stock coating Polyester polyol (75%) .sup.1) 65.5 Xylene 21.8 Methoxypropyl acetate 12.7 100.0 Hardener Aliphatic isocyanate (75%) .sup.2) 11.5 .sup.1) commercially available under the name Setal ® D RD 181 X, Allnex .sup.2) commercially available under the name Desmodur ® 75 N MPA/X, Covestro

TABLE-US-00005 TABLE 3 Results for solvent-containing wood coating 1 Slip Solvent- Slip and resistance containing wood levelling values Haptic Scratch coating 1 (SW) additives Recoatability [cN] property/touch resistance Standard sample 0 GT 0 336 0 0 (without additive) SW 11 1 GT 1 65 + 0 SW 12 2 GT 1 60 + 0 SW 13 3 GT 1 62 + 0 SW CE 14 CE 4 GT 5 46 + 0 SW CE 15 CE 5 GT 5 167 0 0 SW CE 16 CE 6 GT 5 183 0 0 SW CE 17 Tego ® Glide GT 5 43 + 0 410 SW CE 18 Borchi ® Gol GT 1 66 0 0 OL 17 SW CE 19 CE 9 GT 5 66 + 0 SW CE 110 CE 10 GT 5 61 − 0 SW CE 111 CE 11 GT 5 49 + 0 [0071] Table 3 shows that the slip and levelling additives according to the invention in this coating system have comparable good to better surface slip and scratch resistance. In addition, it has been established that the additized coatings have recoatability and good haptic properties. The commercial additive from Borcher likewise has a recoatable property but without good haptic properties/touch.

[0072] 2.2 Solvent-Containing Wood Coating 2 [0073] A stock coating without hardener is firstly prepared according to Table 4. For this purpose, the constituents are mixed with a Dispermat for 10 minutes at 1000 rpm. [0074] For the performance test, 0.35 g of an additive according to Table 1 are added to 50 g of stock coating and homogenized for 1 minute at 500 rpm using a Dispermat (additized stock coating). [0075] 13.1 g of hardener are weighed and re-homogenized with 25 g of additized stock paint for 1 minute at 500 rpm using a Dispermat. The wood coating 2 thus prepared is applied to a wood panel which is used for the performance test.

TABLE-US-00006 TABLE 4 Solvent-containing wood coating - formulation 2 Weight [g] Stock coating Polyester polyol (75%) .sup.3) 71.5 Methoxypropyl acetate 5.3 Butyl acetate 17.9 Ethyl acetate 5.3 100 Hardener Aromatic isocyanate (51%) .sup.4) 51.4 Aromatic isocyanate (75%) .sup.5) 34.2 Butyl acetate 14.4 100 .sup.3) commercially available under the name Desmophen ® 1300 BA, Covestro .sup.4) commercially available under the name Desmodur ® IL 1351, Covestro .sup.5) commercially available under the name Desmodur ® L 75, Covestro

TABLE-US-00007 TABLE 5 Results for solvent-containing wood coating 2 Solvent- Slip containing wood Slip and levelling resistance Haptic Scratch coating 2 (SW) additives Recoatability values [cN] property/touch resistance Standard sample 0 GT 0 182 0 0 (without additive) SW 21 1 GT 0 47 + + SW 22 2 GT 0 46 + + SW 23 3 GT 0 50 + + SW CE 24 CE 4 GT 5 48 + + SW CE 25 CE 5 GT 5 119 0 − SW CE 26 CE 6 GT 5 124 0 − SW CE 27 Tego ® Glide 410 GT 5 45 + + SW CE 28 Borchi ® Gol OL 17 GT 5 48 + + SW CE 29 CE 9 GT 3 61 + + SW CE 210 CE 10 GT 5 43 + − SW CE 211 CE 11 GT 5 58 + + [0076] Table 5 shows that the inventive slip and levelling additives in this wood coating system also have excellent recoatability. They also improve the surface slip, scratch resistance and haptic (“surface feel”) properties/touch. All comparative examples have no recoatable property.