EP2414412A1

EP2414412A1 - (meth)acrylate polymer, coating agent, method for producing a coating, and coated object

Info

Publication number: EP2414412A1
Application number: EP10705397A
Authority: EP
Inventors: Stefanie Maus; Christine Maria BREINER; Cornelia Borgmann; Ulrike Behrens; Oliver Marx; Stephan Fengler
Original assignee: Evonik Roehm GmbH
Current assignee: Evonik Roehm GmbH
Priority date: 2009-03-30
Filing date: 2010-03-02
Publication date: 2012-02-08
Also published as: CN102356101A; TW201107352A; WO2010112285A1; DE102009001970A1; US20120065322A1

Abstract

The present invention relates to a (meth)acrylate polymer for producing a coating composition, wherein the (meth)acrylate polymer has a weight average of the molecular weight in the range of 10000 to 60000 g/mol, and the (meth)acrylate polymer comprises 0.5 to 40 weight percent units derived from (meth)acrylic monomers, which in the alkyl radical have at least one double bond and 8 to 40 carbon atoms, 0.1 to 10 weight percent units derived from acid group-containing monomers, and 50 to 99.4 weight percent units derived from (meth)acrylates having 1 to 12 carbon atoms in the alkyl radical, which have no double bonds or heteroatoms in the alkyl radical, said (meth)acrylates having 1 to 12 carbon atoms in the alkyl radical being selected such that a polymer consisting of said (meth)acrylates having 1 to 12 carbon atoms in the alkyl radical has a glass transition temperature of at least 40ºC, in each case relative to the weight of the (meth)acrylate polymer. The present invention further relates to a coating agent containing said polymer, and to a method for producing a coating. The present invention further describes a coated object comprising a coating, which can be obtained by the method.

Description

(Meth) acrylate polymer, coating agent, process for producing a coating and coated article

The present invention relates to a (meth) acrylate polymer and a coating agent comprising this polymer. In addition, the present invention is directed to a method for producing a coating carried out using the coating agent and a coated article obtainable by the method.

Coating agents, in particular paints, have been produced synthetically for a long time. An important group of these agents is based on aqueous dispersions which often comprise (meth) acrylate polymers. For example, the publication DE-A-41 05 134 describes aqueous dispersions which contain alkyl methacrylates as binders. Furthermore, such paints from US 5,750,751, EP-A-1 044 993 and WO 2006/013061 are known.

Aqueous dispersions can be used for the production of many coatings and are characterized in particular by a high environmental compatibility. A disadvantage, however, is that aqueous dispersions have to be processed under controlled conditions of temperature and humidity, since otherwise the quality of the coatings obtained does not meet the upper requirements.

In addition to aqueous dispersions, reactive coatings form another group of known coating compositions. Such paints are known for example from EP-O 693 507. These coating compositions can be processed in particular to particularly hard and durable coatings. However, the curing conditions must be met very accurately, otherwise no high quality paints are obtained. Temperature and humidity fluctuations preclude the production of a high quality coating. If outdoor objects are provided with a coating, temperature and humidity fluctuations must be taken into account. Therefore, so-called solvent-based paints are often used for these purposes, which could not be replaced due to their performance, especially for the production of protective coatings (protective coatings). This performance comprises in particular a good processability of the coating compositions and a high resistance of the resulting coatings. Such coating compositions are described, for example, in GB 793776. However, since large amounts of solvent are released during processing, solvent-based paints have relatively low environmental impact.

In view of the prior art, it is an object of the present invention to provide polymers and coating compositions having excellent properties. In particular, these properties include good processability over a wide temperature and humidity range. Furthermore, the coating composition should have the highest possible solids content. In relation to performance, the coating compositions should show improved environmental compatibility.

In particular, the coating compositions should have a high solids content.

Furthermore, it was therefore an object of the present invention to provide a coating composition which has a particularly long shelf life and durability. Furthermore, the hardness of the coatings obtainable from the coating compositions should be able to be varied over a wide range. In particular, particularly hard, scratch-resistant coatings should be able to be obtained. Furthermore, coatings which are obtainable from the coating compositions according to the invention, based on the hardness, should have a relatively low brittleness.

A further object is to provide polymers, by the use of coating agents with good processability are available. The coatings obtainable from the coating compositions should have a high weather resistance, in particular a high UV resistance.

Furthermore, the coatings obtainable from the polymers or coating compositions should show a particularly high resistance to solvents. This stability should be high compared to many different solvents. Likewise, a very good resistance to water, especially salt water should be given.

Another object can be seen to provide polymers or coating compositions that can be obtained very inexpensively and on an industrial scale.

These and other objects which are not explicitly mentioned, but which can be readily deduced or deduced from the contexts discussed hereinbelow, are solved by a (meth) acrylate polymer having all the features of patent claim 1. Advantageous modifications of the (meth) acrylate polymer according to the invention are placed in subclaims under protection. With respect to a coating agent, a process for producing a coating and a coated article, claims 14, 17 and 19 provide a solution to the underlying problems.

The present invention accordingly provides a (meth) acrylate polymer for the preparation of a coating composition, which is characterized in that the (meth) acrylate polymer has a weight-average molecular weight in the range from 10,000 to 60,000 g / mol and the (meth) acrylate polymer 0.5 to 40 wt .-% of units derived from (meth) acrylic monomers having in the alkyl radical at least one double bond and 8 to 40 carbon atoms, 0.1 to 10 wt .-% of units derived from acid group-containing monomers, and

50 to 99.4% by weight of units derived from (meth) acrylates having 1 to 12 carbon atoms are derived in the alkyl radical which have no double bonds or heteroatoms in the alkyl radical and these (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical are selected such that a polymer consisting of these (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical has a glass transition temperature of at least 40 ⁰ C, each based on the weight of the (meth) acrylate polymer comprises.

Furthermore, the measures according to the invention make it possible, inter alia, to achieve the following advantages:

The polymers of the present invention result in a coating agent that exhibits good processability over a wide range of temperature and humidity. Furthermore, the coating agent may have a very high solids content without the processability of the coating agent is too much impaired.

In terms of performance, the coating agents are very environmentally friendly. In particular, the coating compositions have a high solids content.

The polymers of the present invention and the coating compositions show a particularly long shelf life and durability. Furthermore, the hardness of the

Coatings obtainable from the coating compositions can be varied over a wide range. In particular, particularly hard, scratch-resistant coatings can be obtained.

Furthermore, coatings which are obtainable from the coating compositions according to the invention, based on the hardness and the chemical resistance, a relatively low brittleness.

The coatings obtainable from the coating compositions show a high weather resistance, in particular a high UV resistance. Furthermore, the coatings obtainable from the polymers or coating compositions show a particularly high resistance to solvents. This stability is high compared to many different solvents. Likewise, a very good resistance to water, especially salt water is given. Therefore, these coating compositions for the production of protective coatings (protective coatings), which are particularly suitable for painting ships or containers, can be used.

In addition, coating compositions of the invention lead to coatings with a high gloss. Furthermore, the polymers and coating compositions according to the invention are particularly cost-effective and industrially available.

The (meth) acrylate polymers can preferably be obtained by free-radical polymerization. Accordingly, the proportion by weight of the respective units which comprise these polymers results from the proportions by weight of corresponding monomers used to prepare the polymers.

The (meth) acrylate polymer according to the invention comprises from 0.5 to 40% by weight, preferably from 1 to 20% by weight, and very particularly preferably from 2 to 10% by weight of units derived from (meth) acrylic monomers are derived, which have at least one double bond and 8 to 40 carbon atoms in the alkyl radical.

(Meth) acrylic monomers having at least one double bond and 8 to 40 carbon atoms in the alkyl group are esters or amides of (meth) acrylic acid whose alkyl group has at least one carbon-carbon double bond and 8 to 40 carbon atoms. The notation (meth) acrylic acid means methacrylic acid and acrylic acid and mixtures thereof. The alkyl or alcohol or amine radical may preferably have 10 to 30 and more preferably 12 to 20 carbon atoms, which radical may comprise heteroatoms, in particular oxygen, nitrogen or sulfur atoms. The alkyl group may have one, two, three or more carbon-carbon double bonds. The Polymerization conditions in which the polymer is prepared, are preferably chosen so that the largest possible proportion of the double bonds of the alkyl radical is maintained in the polymerization. This can be done for example by stubborn hindrance of the double bonds contained in the alcohol radical. Furthermore, at least a part, preferably all of the double bonds contained in the alkyl radical of the (meth) acrylic monomer, has a lower reactivity in a free-radical polymerization than a (meth) acrylic group, so that preferably no further (meth) acrylic groups in the alkyl radical are included.

The iodine value of the (meth) acrylic monomers to be used for the preparation of the polymers which have at least one double bond and 8 to 40 carbon atoms in the alkyl radical is preferably at least 40, more preferably at least 80 and most preferably at least 140 g iodine / 100 g (meth ) acrylic monomer.

Such (meth) acrylic monomers generally correspond to the formula (I)

wherein the radical R is hydrogen or methyl, X is independently oxygen or a group of the formula NR ', wherein R' is hydrogen or a radical having 1 to 6 carbon atoms, and R ^{1 is} a linear or branched radical having 8 to 40, preferably 10 to 30 and more preferably 12 to 20 carbon atoms which has at least one double bond.

(Meth) acrylic monomers which have at least one double bond and 8 to 40 carbon atoms in the alkyl radical can be obtained, for example, by esterification of (meth) acrylic acid, reaction of (meth) acryloyl halides or transesterification of (meth) acrylates with alcohols which are at least have a double bond and 8 to 40 carbon atoms. Accordingly, (meth) acrylamides can be obtained by reaction with an amine. These reactions are for example in Ullmann's Encyclopedia of Industrial Chemistry 5th edition on CD-ROM or F. -B. Chen, G. Bufkin, "Crosslable Emulsion Polymers by Autooxidation I", Journal of Applied Polymer Science, Vol. 30, 4571-4582 (1985).

Suitable alcohols include octenol, nonenol, decenol, undecenol, dodecenol, tridecenol, tetradecenol, pentadecenol, hexadecenol, heptadecenol, octadecenol, nonadecenol, icosenol, docosenol, octadiene-ol, nonanoedia-ol, deca- dien-ol, undecadiene-ol, dodecadiene-ol, trideca-diene-ol, tetradeca-diene-ol, pentadeca-dien-ol, hexadeca-dien-ol, heptadeca-dien-ol, octadecadiene- ol, Nonadeca-dien-ol, Ikosa-dien-ol and / or Docosa-dien-ol. These so-called fatty alcohols are sometimes commercially available or can be obtained from fatty acids, this reaction being carried out, for example, in F.-B. Chen, G. Bufkin, Journal of Applied Polymer Science, Vol. 30, 4571-4582 (1985).

The preferred (meth) acrylates obtainable by this process include, in particular, octadiene-yl (meth) acrylate, octadeca-diene-yl (meth) acrylate, octadeca-then-yl (meth) acrylate, Hexadecenyl (meth) acrylate, octadecenyl (meth) acrylate and hexadecadienyl (meth) acrylate.

In addition, (meth) acrylates which have at least one double bond and 8 to 40 carbon atoms in the alkyl radical can also be obtained by reacting unsaturated fatty acids with (meth) acrylates which have reactive groups in the alkyl radical, in particular alcohol radical. The reactive groups include in particular hydroxy groups and epoxy groups. Accordingly, for example, hydroxyalkyl (meth) acrylates such as 3-hydroxypropyl (meth) acrylate, 3,4-dihydroxybutyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2,5-dimethyl -1, 6-hexanediol (meth) acrylate, 1, 10-decanediol (meth) acrylate; or epoxy-containing (meth) acrylates, for example glycidyl (meth) acrylate can be used as starting materials for the preparation of the aforementioned (meth) acrylates. Suitable fatty acids for reaction with the abovementioned (meth) acrylates are often commercially available and are obtained from natural sources. These include undecylenic acid, palmitoleic acid, oleic acid, elaidic acid, vaccenic acid, icosenoic acid, cetoleic acid, erucic acid, nervonic acid, linoleic acid, linolenic acid, arachidonic acid, timnodonic acid, clupanodonic acid and / or cervonic acid.

The preferred (meth) acrylates obtainable by this process include, in particular, (meth) acryloyloxy-2-hydroxypropyl linoleic acid ester, (meth) acryloyloxy-2-hydroxypropyl linolenic acid ester and (meth) acryloyloxy-2-hydroxypropyl oleic acid ester.

The reaction of the unsaturated fatty acids with (meth) acrylates which have reactive groups in the alkyl radical, in particular alcohol radical, is known per se and is described, for example, in DE-A-41 05 134, DE-A-25 13 516, DE-A-26 38 544 and US 5,750,751.

According to a preferred embodiment, (meth) acrylic monomers of the general formula (II)

wherein R is hydrogen or a methyl group, X ¹ and X ^{2 are} independently oxygen or a group of the formula NR ', wherein R' is hydrogen or a radical having 1 to 6 carbon atoms, with the proviso that at least one of the groups X ¹ and X ² a group of the formula NR ', wherein R' is hydrogen or a radical having 1 to 6 carbon atoms, Z is a linking group, and R ^{2 is} an unsaturated radical having 9 to 25 carbon atoms, are used. Surprising advantages can furthermore be achieved by the use of a (meth) acrylic monomer of the general formula (III)

wherein R is hydrogen or a methyl group, X ^{1 is} oxygen or a group of formula NR ', wherein R' is hydrogen or a radical having 1 to 6 carbon atoms, Z is a linking group, R is hydrogen or a radical having 1 to 6 carbon atoms and R ^{2 is} an unsaturated Rest with 9 to 25 carbon atoms, achieve.

The term "radical having 1 to 6 carbon atoms" represents a group having 1 to 6 carbon atoms and includes aromatic and heteroaromatic groups and also alkyl, cycloalkyl, alkoxy, cycloalkoxy, alkenyl, alkanoyl,

Alkoxycarbonyl groups and heteroalipatic groups. The groups mentioned can be branched or unbranched. Furthermore, these groups may have substituents, in particular halogen atoms or hydroxyl groups.

The radicals R 'are preferably alkyl groups. The preferred alkyl groups include the methyl, ethyl, propyl, isopropyl, 1-butyl, 2-butyl, 2-methylpropyl or tert-butyl group.

The group Z preferably represents a linking group comprising 1 to 10, preferably 1 to 5 and most preferably 2 to 3 carbon atoms. These include in particular linear or branched, aliphatic or cycloaliphatic radicals, such as a methylene, ethylene, propylene, iso-propylene, n-butylene, iso-butylene, t-butylene or cyclohexylene group, wherein the Ethylene group is particularly preferred.

The group R ² in formula (II) represents an unsaturated radical having 9 to 25 carbon atoms. These groups include in particular alkenyl, cycloalkenyl, Alkenoxy, cycloalkenoxy, alkenoyl and heteroalipatic groups. Furthermore, these groups may have substituents, in particular halogen atoms or hydroxyl groups. The preferred groups include in particular alkenyl groups, such as, for example, the nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, , Docosenyl, octadiene-yl, nonanediazyl, decadiene-yl, undecanediazyl, dodecadienyl, tridecadienyl, tetradecadienyl , Pentadeca-diene-yl, hexadeca-dien-yl, heptadeca-dien-yl, octadeca-dien-yl, nonadeca-dien-yl, eicosa-dien-yl, heneicosa-diene-yl , Docosa-dien-yl, tricosa-dienyl and / or heptadeca-then-yl group.

The preferred (meth) acrylic monomers of the formula (II) or (III) include heptadecenyloyloxy-2-ethyl (meth) acrylamide, heptadecadienyloxy-2-ethyl (meth) acrylamide, heptadeca- then-yloyloxy-2-ethyl (meth) acrylamide, heptadecenyloyloxy-2-ethyl (meth) acrylamide, (meth) acryloyloxy-2-ethyl-palmitoleic acid amide, (meth) acryloyloxy-2-ethyl-oleic acid amide, (meth) acryloyloxy 2-ethyl-icosenoic acid amide, (meth) acryloyloxy-2-ethyl-cetolenic acid amide, (meth) acryloyloxy-2-ethyl-erucic acid amide, (meth) acryloyloxy-2-ethyl-linoleic acid amide, (meth) acryloyloxy-2-ethyl-linolenic acid amide , (Meth) acryloyloxy-2-propyl-palmitoleic acid amide, (meth) acryloyloxy-2-propyl-oleic acid amide, (meth) acryloyloxy-2-propyl-icosenoic acid amide, (meth) acryloyloxy-2-propyl-cetoleic acid amide, (meth) acryloyloxyamide 2-propyl-erucic acid amide, (meth) acryloyloxy-2-propyl-linoleic acid amide and (meth) acryloyloxy-2-propyl-linolenic acid amide.

The notation (meth) acryl stands for acrylic and methacrylic radicals, with methacrylic radicals being preferred. Particularly preferred monomers according to formula (II) or (III) are methacryloyloxy-2-ethyl-oleic acid amide, methacryloyloxy-2-ethyl-linolenic acid amide and / or methacryloyloxy-2-ethyl-linolenic acid amide.

The (meth) acrylic monomers of the formula (II) or (III) can be obtained in particular by multistage processes. In a first stage, for example, an or a plurality of unsaturated fatty acids or fatty acid esters with an amine, for example, ethylenediamine, ethanolamine, propylenediamine or propanolamine, to an amide. In a second step, the hydroxy group or the amine group of the amide is reacted with a (meth) acrylate, for example methyl (meth) acrylate, to obtain the monomers of the formula (II) or (III). For the preparation of monomers in which X ^{1 is} a group of the formula NR ', wherein R' is hydrogen or a radical having 1 to 6 carbon atoms, and X ^{2 is} oxygen, correspondingly first an alkyl (meth) acrylate, for example methyl (meth ) acrylate, reacted with one of the abovementioned amines to give a (meth) acrylamide having a hydroxy group in the alkyl radical, which is subsequently reacted with an unsaturated fatty acid to give a (meth) acrylic monomer of the formula (II) or (III). Transesterification of alcohols with (meth) acrylates or the preparation of (meth) acrylic acid amides are inter alia in CN 1355161, DE 21 29 425 filed on 14.06.71 at the German Patent Office with the application number P 2129425.7, DE 34 23 443 filed on 26.06.84 at the German Patent Office with the application number P 3423443.8 or EP-AO 534 666 filed on 16.09.92 the European Patent Office with the application number EP 92308426.3 set forth, wherein the reaction conditions described in these publications and the catalysts set forth therein, etc. for purposes of disclosure in this application be inserted. Furthermore, these reactions are described in "Synthesis of Acrylic Esters by Transestation", J. Haken, 1967.

In this case, intermediates obtained, for example carboxamides which have hydroxyl groups in the alkyl radical, can be purified. According to a particular embodiment of the present invention, intermediates obtained can be reacted without expensive purification to the (meth) acrylic monomers of formula (II) or (III).

Furthermore, the (meth) acrylic monomers having 8 to 40, preferably 10 to 30 and particularly preferably 12 to 20 carbon atoms and at least one double bond in the alkyl radical in particular include monomers of the general formula (IV)

wherein R is hydrogen or a methyl group, X is oxygen or a group of the formula NR ', wherein R' is hydrogen or a radical having 1 to 6 carbon atoms, R ^{3 is} an alkylene group having 1 to 22 carbon atoms, Y is oxygen, sulfur or a group of the formula NR ", where R" is hydrogen or a radical having 1 to 6 carbon atoms, and R ^{4 is} an unsaturated radical having at least 8 carbon atoms and at least two double bonds.

In formula (IV), the radical R ^{3 is} an alkylene group having 1 to 22 carbon atoms, preferably 1 to 10, more preferably 2 to 6 carbon atoms. The radical R ³ , according to a particular embodiment of the present invention, represents an alkylene group having 2 to 4, more preferably 2 carbon atoms. The alkylene groups having 1 to 22 carbon atoms include in particular the methylene, ethylene, propylene, iso-propylene, n-butylene, iso-butylene, t-butylene or cyclohexylene group, with the ethylene group being particularly preferred.

The radical R ⁴ comprises at least two CC double bonds which are not part of an aromatic system. Preferably, the radical R ^{4 represents} a group with exactly 8 carbon atoms, which has exactly two double bonds. The radical R ⁴ preferably represents a linear hydrocarbon radical which has no heteroatoms. According to a particular embodiment of the present invention, the radical R ⁴ in formula (IV) may comprise a terminal double bond. In a further variant of the present invention, the radical R ⁴ in formula (IV) can not comprise a terminal double bond. The double bonds contained in the radical R ⁴ may preferably be conjugated. According to another preferred embodiment of the present invention, those contained in the radical R ⁴ are

Double bonds not conjugated. The preferred R ⁴ radicals which have at least two double bonds include, among others, the octa-2,7-dienyl group, Octa-3,7-dienyl, octa-4,7-dienyl, octa-5,7-dienyl, octa-2,4-dienyl, octa-2,5-dienyl, octa-2,6-dienyl, octa 3,5-dienyl group, octa-3,6-dienyl group and octa-4,6-dienyl group.

The (meth) acrylic monomers of the general formula (IV) include, inter alia, 2 - [((2-E) octa-2,7-dienyl) methylamino] ethyl 2-methylprop-2-enoate, 2 - [( (2-Z) Octa-2,7-dienyl) methylamino] ethyl 2-methylprop-2-enoate, 2 - [((3-E) octa-3,7-dienyl) methylamino] ethyl-2-methylpropyl 2-enoate, 2 - [((4-Z) octa-4,7-dienyl) methylamino] ethyl 2-methylprop-2-enoate, 2 - [(octa-2,6-dienyl) methylamino] ethyl-2 -methylprop-2-enoate, 2 - [(octa-2,4-dienyl) methylamino] ethyl-2-methylprop-2-enoate, 2 - [(octa-3,5-dienyl) methylamino] ethyl-2-methylprop -2-enoate, 2 - [((2-E) octa-2,7-dienyl) methylamino] ethyl (meth) acrylamide, 2 - [((2-Z) octa-2,7-dienyl) methylamino] ethyl (meth) acrylamide, 2 - [((3-E) octa-3,7-dienyl) methylamino] ethyl (meth) acrylamide, 2 - [((4-Z) octa-4,7-dienyl) methylamino] ethyl (meth) acrylamide, 2 - [(octa-2,6-dienyl) methylamino] ethyl (meth) acrylamide, 2 - [(octa-2,4-dienyl) methylamino] ethyl (meth) acrylamide , 2 - [(Octa-3,5-dienyl) methylamino] ethyl (meth) acrylamide, 2 - [((2-E) octa-2,7-dienyl) e thylamino] ethyl 2-methylprop-2-enoate, 2 - [((2-Z) octa-2,7-dienyl) ethylamino] ethyl 2-methylprop-2-enoate, 2 - [((3-E) Octa-3,7-dienyl) ethylamino] ethyl 2-methylprop-2-enoate, 2 - [((4-Z) octa-4,7-dienyl) ethylamino] ethyl 2-methylprop-2-enoate, 2 - [(Octa-2,6-dienyl) ethylamino] ethyl 2-methylprop-2-enoate, 2 - [(octa-2,4-dienyl) ethylamino] ethyl 2-methylprop-2-enoate, 2- [ (Octa-3,5-dienyl) ethylamino] ethyl 2-methylprop-2-enoate, 2 - [((2-E) octa-2,7-dienyl) methylamino] ethyl-prop-2-enoate, 2- [((2-Z) octa-2,7-dienyl) methylamino] ethyl-prop-2-enoate, 2 - [((3-E) octa-3,7-dienyl) methylamino] ethyl-prop-2- enoate, 2 - [((4-Z) octa-4,7-dienyl) methylamino] ethyl-prop-2-enoate, 2 - [(octa-2,6-dienyl) methylamino] ethyl-prop-2-enoate , 2 - [(Octa-2,4-dienyl) -methyl-amino] -ethyl-prop-2-enoate, 2 - [(octa-3,5-dienyl) -methyl-amino] -ethyl-prop-2-enoate, 2 - ((2 -E) octa-2,7-dienyloxy) ethyl 2-methylprop-2-enoate, 2 - ((2-Z) octa-2,7-dienyloxy) ethyl 2-methylprop-2-enoate, 2- ( (3-E) octa-3,7-dienyloxy) ethyl 2-methylprop-2-enoate, 2 - ((4-Z) octa-4,7-dienyloxy) ethyl-2 -methylprop-2-enoate, 2- (octa-2,6- dienyloxy) ethyl 2-methylprop-2-enoate, 2- (octa-2,4-dienyloxy) ethyl-2-methylprop-2-enoate, 2- (octa-3,5-dienyloxy) ethyl-2-methylpropyl 2-enoate, 2 - ((2-E) octa-2,7-dienyloxy) ethyl-prop-2-enoate, 2 - ((2-Z) octa-2,7-dienyloxy) ethyl-prop-2- enoate, 2 - ((3-E) octa-3,7-dienyloxy) ethyl-prop-2-enoate, 2 - ((4-Z) octa-4,7-dienyloxy) ethyl-prop-2-enoate, 2- (octa-2,6-dienyloxy) ethyl-prop-2-enoate, 2- (octa-2,4-dienyloxy) ethyl-prop-2-enoate and 2- (octa-3,5-dienyloxy) ethyl prop-2-enoate.

The (meth) acrylic monomers of the formula (IV) set out above can be obtained in particular by processes in which (meth) acrylic acid or a (meth) acrylate, in particular methyl (meth) acrylate or ethyl (meth) acrylate with an alcohol and / or an amine is reacted. These reactions have been previously stated.

The starting material to be reacted with the (meth) acrylic acid or the (meth) acrylate may advantageously correspond to the formula (V),

HX-R-YR ⁴ (V),

wherein X is oxygen or a group of the formula NR ', wherein R' is hydrogen or a radical having 1 to 6 carbon atoms, R ^{3 is} an alkylene group having 1 to 22 carbon atoms, Y is oxygen, sulfur or a group of the formula NR ", where R "Represents hydrogen or a radical having 1 to 6 carbon atoms, and R ^{4 is} an at least double unsaturated radical having at least 8 carbon atoms.

With regard to the meaning of preferred radicals R ', R ", R ³ , Y and R ⁴ , reference is made to the description of the formula (IV).

The preferred starting materials of the formula (V) include (methyl (octa-2,7-dienyl) amino) ethanol, (ethyl (octa-2,7-dienyl) amino) ethanol, 2-octa-2,7-dienyloxyethanol, (methyl octa-2,7-dienyl) amino () ethylamine,

(Methyl (octa-3,7-dienyl) amino) ethanol, (ethyl (octa-3,7-dienyl) amino) ethanol, 2-octa-3,7-dienyloxyethanol, (methyl (octa-3,7-dienyl ) amino) ethyl amine, (Methyl (octa-4,7-dienyl) amino) ethanol, (ethyl (octa-4,7-dienyl) amino) ethanol, 2-octa-4,7-dienyloxyethanol, (methyl (octa-4,7-dienyl ) amino) ethylannin, (methyl (octa-5,7-dienyl) amino) ethanol, (ethyl (octa-5,7-dienyl) amino) ethanol, 2-octa-5,7-dienyloxyethanol, (methyl (octa 5,7-dienyl) amino) ethylamine, (methyl (octa-2,6-dienyl) amino) ethanol, (ethyl (octa-2,6-dienyl) amino) ethanol, 2-octa-2,6-dienyloxyethanol, (Methyl (octa-2,6-dienyl) amino) ethyl-amine, (methyl (octa-2,5-dienyl) amino) ethanol, (ethyl (octa-2,5-dienyl) amino) ethanol, 2-octa-2 , 5-dienyloxyethanol, (methyl (octa-2,5-dienyl) amino) ethylamine, (methyl (octa-2,4-dienyl) amino) ethanol, (ethyl (octa-2,4-dienyl) amino) ethanol, 2-octa-2,4-dienyloxyethanol, (methyl (octa-2,4-dienyl) amino) ethylamine,

(Methyl (octa-3,6-dienyl) amino) ethanol, (ethyl (octa-3,6-dienyl) amino) ethanol, 2-octa-3,6-dienyloxyethanol, (methyl (octa-3,6-dienyl ) amino) ethylamine, (methyl (octa-3,5-dienyl) amino) ethanol, (ethyl (octa-3,5-dienyl) amino) ethanol, 2-octa-3,5-dienyloxyethanol, (methyl (octa) 3,5-dienyl) amino) ethylamine, (methyl (octa-4,6-dienyl) amino) ethanol, (ethyl (octa-4,6-dienyl) amino) ethanol, 2-octa-4,6-dienyloxyethanol and (methyl (octa-4,6-dienyl) amino) ethylannin. The educts of the formula (V) can be used individually or as a mixture.

The educts according to formula (V) can be obtained inter alia by known methods of telomerizing 1,3-butadiene. Here, the term means

"Telomerization" the reaction of compounds with conjugated double bonds in the presence of nucleophiles The documents filed in WO 2004/002931 filed on 17.06.2003 with the European Patent Office with the application number PCT / EP2003 / 006356, WO 03/031379 filed on 01.10.2002 with the application number PCT / EP2002 / 10971 and WO 02/100803 filed on 04.05.2002 with the application number PCT / EP2002 / 04909 set out procedures, in particular the catalysts used for the reaction and the reaction conditions, such as pressure and temperature, for the purposes of disclosure incorporated in the present application. Preferably, the telomerization of 1, 3-butadiene using metal compounds comprising metals of the 8th to 10th group of the Periodic Table of the Elements can be carried out as a catalyst, wherein palladium compounds, in particular Palladiumcarbenkomplexe, which are set forth in detail in the above-mentioned documents, can be used with particular preference.

As nucleophile, especially dialcohols, such as ethylene glycol, 1, 2-propanediol, 1, 3-propanediol; Diamines such as ethylenediamine, N-methyl-ethylenediamine, N ₁ N'-dimethylethylenediamine or hexamethylenediamine; or aminoalkanols, such as aminoethanol, N-methylaminoethanol, N-ethylaminoethanol, aminopropanol, N-methylaminopropanol or N-ethylaminopropanol.

When using (meth) acrylic acid as a nucleophile, for example, octadienyl (meth) acrylates can be obtained, which are particularly suitable as (meth) acrylic monomers having 8 to 40 carbon atoms.

The temperature at which the Telomehsationsreaktion is carried out is between 10 and 180 ⁰ C, preferably between 30 and 120 ⁰ C, particularly preferably between 40 and 100 ⁰ C. The reaction pressure is 1 to 300 bar, preferably from 1 to 120 bar, particularly preferably 1 to 64 bar and most preferably 1 to 20 bar.

The preparation of isomers from compounds having an octa-2,7-dienyl group can be accomplished by isomerization of the double bonds contained in the compounds having an octa-2,7-dienyl group.

The above-mentioned (meth) acrylic monomers having at least one double bond and 8 to 40 carbon atoms in the alkyl group may be used singly or as a mixture of two or more monomers.

Further, the (meth) acrylate polymer of the present invention comprises 0.1 to 10% by weight, preferably 0.5 to 8% by weight, and particularly preferably 1 to 5% by weight. Units derived from acid group-containing monomers based on the total weight of the (meth) acrylate polymer.

Acid group-containing monomers are compounds which can be preferably radically copolymerized with the previously set forth (meth) acrylic monomers. These include, for example, monomers having a sulfonic acid group, such as vinylsulfonic acid; Monomers having a phosphonic acid group, such as vinylphosphonic acid and unsaturated carboxylic acids, such as methacrylic acid, acrylic acid, fumaric acid and maleic acid. Particularly preferred are methacrylic acid and acrylic acid. The acid group-containing monomers can be used individually or as a mixture of two, three or more acid group-containing monomers.

In addition to the (meth) acrylic monomers described above, which have at least one double bond and 8 to 40 carbon atoms in the alkyl radical, and the acid group-containing monomers, inventive (meth) acrylate polymers comprise 50% by weight to 99.4% by weight. %, preferably 60 wt .-% to 98 wt .-% and most preferably 80 wt .-% to 97 wt .-% of units derived from (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical, which are not double bonds or heteroatoms in the alkyl radical and these (meth) acrylates having 1 to 12

Carbon atoms in the alkyl radical are selected so that a polymer consisting of these (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical has a glass transition temperature of at least 40 ⁰ C, based on the weight of the (meth) acrylate polymer.

The (meth) set forth above acrylates are selected so that a polymer consisting of these (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical has a glass transition temperature of at least 40 ⁰ C, preferably at least 50 ° C and particularly preferably at least 1 to 12 carbon atoms 60 ⁰ C has. The glass transition temperature Tg of the polymer can be determined in a known manner by means of differential scanning calorimetry (DSC), in particular according to DIN EN ISO 11357 be determined. Preferably, the glass transition temperature can be determined as the center of the glass stage of the second heating curve at a heating rate of 10 ⁰ C per minute. Furthermore, the glass transition temperature Tg can also be calculated approximately in advance by means of the Fox equation. After Fox TG, Bull. Am. Physics Soc. 1, 3, page 123 (1956): 1 x, X ₁ x "

Tg Tg ₁ Tg Tg _n ₂ wherein X _n is the mass fraction designated n (wt .-% / 100) of monomer n and Tg _{n is} the glass transition temperature in Kelvin of the homopolymer of the monomer. Further helpful hints can be found in the Polymer Handbook 2 ^nd Edition, J. Wiley & Sons, New York (1975), which gives Tg values for the most common homopolymethylates. For example, according to this handbook, poly (methyl methacrylate) has a glass transition temperature of 378K, poly (butyl methacrylate) of 297K, poly (isobornyl methacrylate) of 383K, poly (isobornyl acrylate) of 367K, and poly (cyclohexyl methacrylate) of 356K. To determine the glass transition temperature, the polymer consisting of said (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical may have a weight average molecular weight of at least 100,000 g / mol and a number average molecular weight of at least 80,000 g / mol.

The (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical described above can be used individually or as a mixture, the mixtures resulting in copolymers which exhibit a correspondingly high glass transition temperature. The choice of type and amount can be made by the previously described formula of Fox et al. respectively.

The (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical which have no double bonds or heteroatoms in the alkyl radical include, inter alia, (meth) acrylates having a linear or branched alkyl radical, such as, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, iso-propyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, tert-butyl (meth) acrylate and Pentyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 3-isopropyl-propyl (meth) acrylate, nonyl (meth) acrylate, decyl ( meth) acrylate, undecyl (meth) acrylate, 5-methylundecyl (meth) acrylate, dodecyl (meth) acrylate; and cycloalkyl (meth) acrylates, such as cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, cyclohexyl (meth) acrylates having at least one substituent on the ring, such as tert-butylcyclohexyl (meth) acrylate and thmethylcyclohexyl (meth) acrylate, norbornyl (meth ) acrylate, methylnorbornyl (meth) acrylate and dimethylnorbornyl (meth) acrylate, bornyl (meth) acrylate, 1-adamantyl (meth) acrylate, 2-adamantyl (meth) acrylate, menthyl (meth) acrylate and isobornyl (meth) acrylate.

Surprising advantages are shown in particular by (meth) acrylate polymers having from 50 to 99.4% by weight of units derived from methyl methacrylate and / or butyl methacrylate, preferably n-butyl methacrylate, based on the weight of the (meth) acrylate polymer. Particularly preferred in this context are polymers comprising from 25 to 50% by weight of units derived from methyl methacrylate and from 20 to 60% by weight of units derived from butyl methacrylate, based in each case on the weight of (meth ) acrylate polymer.

Also of particular interest are (meth) acrylate polymers which preferably comprise from 0.1 to 99.4% by weight, from 5 to 50% by weight and most preferably from 20 to 40% by weight of units derived from Cycloalkyl (meth) acrylates, in particular of cyclohexyl methacrylate, cyclohexyl acrylate, cyclohexyl (meth) acrylates having at least one substituent on the ring, such as tert-butylcyclohexyl methacrylate and trimethylcyclohexyl (meth) acrylate, preferably 2,4,6-Thmethylcyclohexylmethacrylat, isobornyl acrylate and / or isobornyl methacrylate derived are.

In addition to the compulsory repeating units set forth above, the (meth) acrylate polymer may comprise units derived from comonomers. These comonomers differ from the above-described units of the polymer, but can be used with the monomers set forth above copolymerize. Preferably, the (meth) acrylate polymer comprises at most 20% by weight, more preferably at most 10% by weight of units derived from comonomers. These include, for example, (meth) acrylates having at least 13 carbon atoms in the alkyl radical, which are derived from saturated alcohols, such as, for example

2-methyldodecyl (meth) acrylate, thdecyl (meth) acrylate, 5-methyltridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, 2-methylhexadecyl (meth) acrylate, heptadecyl ( meth) acrylate, 5-iso-propylheptadecyl (meth) acrylate, 4-tert-butyloctadecyl (meth) acrylate, 5-ethyloctadecyl (meth) acrylate, 3-iso-propyloctadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecyl (meth) acrylate, eicosyl (meth) acrylate, cetyleicosyl (meth) acrylate, stearyleicosyl (meth) acrylate, docosyl (meth) acrylate and / or eicosyltetrathacontyl (meth) acrylate;

Cycloalkyl (meth) acrylates such as 2,4,5-Th-t-butyl-3-vinylcyclohexyl (meth) acrylate, 2,3,4,5-tetra-t-butylcyclohexyl (meth) acrylate;

heterocyclic (meth) acrylates such as 2- (1-imidazolyl) ethyl (meth) acrylate, 2- (4-morpholinyl) ethyl (meth) acrylate, 1- (2-methacryloyloxyethyl) -2-pyrrolidone;

Nitriles of (meth) acrylic acid and other nitrogen-containing methacrylates such as N- (methacryloyloxyethyl) diisobutylketimine, N- (methacryloyloxyethyl) dihexadecylketimine, methacryloylamidoacetonitrile, 2-methacryloyloxyethylmethylcyanamide, cyanomethylmethacrylate;

Aryl (meth) acrylates, such as benzyl (meth) acrylate or phenyl (meth) acrylate, wherein the aryl radicals may each be unsubstituted or substituted up to four times;

(Meth) acrylates having a hydroxy group in the alkyl radical, in particular 2-hydroxyethyl (meth) acrylate, preferably 2-hydroxyethyl methacrylate (HEMA), hydroxypropyl (meth) acrylate, for example 2-hydroxypropyl (meth) acrylate and 3- Hydroxypropyl (meth) acrylate, preferably hydroxypropyl methacrylate (HPMA), hydroxybutyl (meth) acrylate, preferably hydroxybutyl methacrylate (HBMA), 3,4-dihydroxybutyl (meth) acrylate, 2,5-dimethyl-1,6-hexanediol (meth) acrylate, 1, 10-decanediol (meth) acrylate, glycerol mono (meth) acrylate and polyalkoxylated derivatives of (meth) acrylic acid, in particular polypropylene glycol mono (meth) acrylate having 2 to 10, preferably 3 to 6 propylene oxide units, preferably polypropylene glycol monomethacrylate with 5 propylene oxide units (PPM5), polyethylene glycol mono (meth) acrylate having 2 to 10, preferably 3 to 6 ethylene oxide units, preferably polyethylene glycol monomethacrylate with about 5 ethylene oxide units (PEM5), polybutylene glycol mono (meth) acrylate, polyethylene glycol polypropylene glycol mono (meth ) acrylate;

(Meth) acrylamides, in particular N-methylol (meth) acrylamide, N ₁ N-

Dimethylaminopropyl (meth) acrylamide, tert-butylaminoethyl methacrylate, methacrylamide and acrylamide; and (meth) acrylates derived from saturated fatty acid amides, such as pentadecyloyloxy-2-ethyl (meth) acrylamide, heptadecyloyloxy-2-ethyl

(meth) acrylamide, (meth) acryloyloxy-2-ethyl-lauric acid amide, (meth) acryloyloxy-2-ethyl-myristic acid amide, (meth) acryloyloxy-2-ethyl-palmitic acid amide, (meth) acryloyloxy-2-ethyl-stearic acid amide, ( Meth) acryloyloxy-2-propyl lauric acid amide, (meth) acryloyloxy-2-propyl-myristic acid amide, (meth) acryloyloxy-2-propyl palmitic acid amide and (meth) acryloyloxy-2-propyl stearic acid amide.

The comonomers also include vinyl esters, such as vinyl acetate, vinyl chloride,

Vinyl versatate, ethylene vinyl acetate, ethylene vinyl chloride;

Maleic acid derivatives, such as maleic anhydride, esters of maleic acid, for example, dimethyl maleate, methylmaleic anhydride; and fumaric acid derivatives such as dimethyl fumarate.

Another group of comonomers are styrenic monomers, such as styrene, substituted styrenes having an alkyl substituent in the side chain, such as e.g. As α-methyl styrene and α-ethyl styrene, substituted styrenes having an alkyl substituent on the ring, such as vinyl toluene and p-methyl styrene, halogenated styrenes, such as monochlorostyrenes, dichlorostyrenes, tribromostyrenes and tetrabromostyrenes.

Heterocyclic vinyl compounds, such as 2-vinylpyridine, 3-vinylpyridine, 2-methyl-5-vinylpyridine, 3-ethyl-4-vinylpyridine, 2,3-dimethyl-5-vinylpyridine, vinylpyrimidine, vinylpiperidine, 9-vinylcarbazole, 3-vinylcarbazole, 4-vinylcarbazole, 1-vinylimidazole, 2-methyl-1-vinylimidazole, N-vinylpyrrolidone, 2-vinylpyrrolidone, N-vinylpyrrolidine, 3-vinylpyrrolidine, N-vinylcaprolactam, N-vinylbutyrolactam, vinyloxolane, vinylfuran, vinylthiophene, vinylthiolane, vinylthiazoles and hydrogenated vinylthiazoles, vinyloxazoles and hydrogenated vinyloxazoles; Maleimide, methylmaleimide;

Vinyl and isoprenyl ethers; and

Vinyl halides such as vinyl chloride, vinyl fluoride, vinylidene chloride and vinylidene fluoride are further examples of comonomers.

The weathering resistance of the coatings can be improved in particular by a reduction in the proportion of styrene monomers in the (meth) acrylate polymer or the coating agent, so that particularly UV-resistant coatings can be obtained by a styrene-free coating composition. According to a particular variant of the present invention, the (meth) acrylate polymer preferably has at most 20% by weight, more preferably at most 10% by weight of units derived from styrenic monomers, in particular styrene, substituted styrenes having an alkyl substituent in the side chain Substituted styrenes are derived with an alkyl substituent on the ring and / or halogenated styrenes, based on the total weight of the (meth) acrylate polymer.

In addition, preference is given to (meth) acrylate polymers which have at most 20% by weight, particularly preferably at most 10% by weight, of units derived from further functionalized (meth) acrylates. Functionalized (meth) acrylates include (meth) acrylates with hydroxy groups in the alkyl radical, aromatic and heterocyclic (meth) acrylates.

Another class of comonomers are crosslinking monomers. These

Monomers have at least two double bonds with similar reactivity in a radical polymerization. These include, in particular, (meth) acrylates derived from unsaturated alcohols, e.g. Allyl (meth) acrylate and vinyl (meth) acrylate; and (meth) acrylates derived from diols or higher alcohols, e.g. Glycol di (meth) acrylates, such as ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, ethylene glycol di (meth) acrylate, tetra- and polyethylene glycol di (meth) acrylate, 1,3-butanediol di (meth) acrylate, 1,4-butanediol di ( meth) acrylate, 1,6-hexanediol di (meth) acrylate, glycerol di (meth) acrylate and diurethane dimethacrylate; (Meth) acrylates having three or more double bonds, e.g. Glycerin (meth) acrylate, thymethylolpropane (meth) acrylate,

Pentaerythritol tetra (meth) acrylate and dipentaerythritol penta (meth) acrylate.

According to a particular modification of the present invention, the proportion of crosslinking monomers may be in the range from 0.1 to 5% by weight, more preferably in the range from 2 to 3% by weight.

The (meth) acrylate polymer according to the invention has a weight average molecular weight in the range from 10,000 to 60,000 g / mol, more preferably in the range from 15,000 to 40,000 g / mol. Number average molecular weight of preferred (meth) acrylate polymers is in the range of 1,000 to 60,000 g / mol, more preferably in the range of 3,000 to 25,000 g / mol. Furthermore, in particular (Meth) acrylate polymers of interest, which have a polydispersity index M _w / M _n in the range of 1 to 10, more preferably in the range of 1, 5 to 7 and most preferably 1, 7 to 3. The molecular weight can be determined by gel permeation chromatography (GPC) against a PMMA standard.

According to a particular aspect of the present invention, the (meth) acrylate polymer may have a molecular weight distribution having at least 2 peaks, as measured by gel permeation chromatography.

The glass transition temperature of the (meth) acrylate polymer is preferably in the range of 10 ⁰ C to 80 ⁰ C, more preferably in the range of 25 to 75 ° C and most preferably in the range of 40 to 70 ⁰ C. The glass transition temperature can be over the Art and the proportion of monomers used to prepare the (meth) acrylate polymer. In this case, the glass transition temperature Tg of the polymer can be determined in a known manner by means of differential scanning calohmetry (DSC), in particular according to DIN EN ISO 11357 can be determined. Preferably, the glass transition temperature can be determined as the center of the glass stage of the second heating curve at a heating rate of 10 ⁰ C per minute. Furthermore, the glass transition temperature Tg can also be calculated approximately in advance by means of the previously described Fox equation.

The iodine number of the inventive methacrylate polymers is preferably in the range of 1 to 60 g of iodine per 100 g of polymer, more preferably in the range of 2 to 50 g of iodine per 100 g of polymer and most preferably 5 to 40 g of iodine per 100 g Polymer, measured according to DIN 53241 -1.

The hydroxyl number of the polymer may preferably be in the range from 0 to 180 mg KOH / g, more preferably 0.1 to 100 mg KOH / g and most preferably in the range from 0.2 to 20 mg KOH / g. The hydroxyl number can be determined according to DIN EN ISO 4629. The (meth) acrylate polymers to be used according to the invention can be synthesized in particular by solution polymerizations, substance polymerizations,

Suspension polymerization or emulsion polymerizations can be obtained, wherein surprising advantages can be achieved by a radical solution polymerization. These methods are set forth in Ullmanns Encyclopedia of Industrial Chemistry, Sixth Edition.

In addition to methods of classical radical polymerization and related methods of controlled radical polymerization, such as ATRP (= Atom Transfer Radical Polymerization), NMP (Nitroxide-mediated polymerization) or RAFT (= Reversible Addition Fragmentation Chain Transfer) can be used.

The usual free radical polymerization is i.a. in Ullmann's Encyclopedia of Industrial Chemistry, Sixth Edition. In general, this will be one

Polymerization initiator and optionally a molecular weight regulator used.

Useful initiators include the azo initiators well known in the art, such as AIBN and 1,1-azobiscyclohexanecarbonitrile, as well as peroxy compounds such as methyl ethyl ketone peroxide, acetyl acetone peroxide,

Dilauryl peroxide, tert-butyl per-2-ethylhexanoate, ketone peroxide, tert-butyl peroctoate, methyl isobutyl ketone peroxide, cyclohexanone peroxide, dibenzoyl peroxide, tert-butyl peroxybenzoate, tert-butyl peroxyisopropyl carbonate, 2,5-bis (2-ethylhexanoylperoxy) -2,5- dimethylhexane, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxy-3,5,5-trimethylhexanoate, dicumyl peroxide, 1,1-bis (tert-butylperoxy) cyclohexane,

1, 1 -Bis (tert-butylperoxy) 3,3,5-trimethylcyclohexane, cumyl hydroperoxide, tert-butyl hydroperoxide, bis (4-tert-butylcyclohexyl) peroxydicarbonate, mixtures of two or more of the aforementioned compounds with one another and mixtures of the abovementioned Compounds with unspecified compounds that can also form radicals. The initiators mentioned can be used both individually and in mixtures. They are preferably used in an amount of 0.05 to 10.0 wt .-%, particularly preferably 1 to 5 wt .-%, based on the total weight of the monomers. It is also preferable to carry out the polymerization with a mixture of different polymerization initiators having a different half-life.

The sulfur-free molecular weight regulators include, but are not limited to, dimeric α-methylstyrene (2,4-diphenyl-4-methyl-1-pentene), enol ethers of aliphatic and / or cycloaliphatic aldehydes, terpenes, β-terpinene, terpinolene, 1, 4-cyclohexadiene, 1, 4-dihydronaphthalene, 1, 4,5,8-tetrahydronaphthalene, 2,5-dihydrofuran, 2,5-dimethylfuran and / or 3, 6-dihydro-2H-pyran, preferably is dimeric α methyl styrene.

Mercury compounds, dialkyl sulfides, dialkyl disulfides and / or diaryl sulfides can preferably be used as the sulfur-containing molecular weight regulator. The following polymerization regulators are exemplified: di-n-butylsulfide, di-n-octylsulfide, diphenylsulfide, thiodiglycol, ethylthioethanol, diisopropyl disulfide, di-n-butyl disulfide, di-n-hexyl disulfide, diacetyl disulfide, diethanol sulfide, di-t-butyl sulfide and dimethyl sulfoxide. Preferred compounds used as molecular weight regulators are mercapto compounds, dialkyl sulfides, dialkyl disulfides and / or diaryl sulfides. Examples of these compounds are ethyl thioglycolate, 2-ethylhexyl thioglycolate, cysteine, 2-mercaptoethanol, 1, 3-mercaptopropanol, 3-mercaptopropane-1, 2-diol, 1, 4-mercaptobutanol, mercaptoacetic acid, 3-mercaptopropionic acid, thioglycolic acid, mercaptosuccinic acid, thioglycerol , Thioacetic acid, thiourea and alkylmercaptans such as n-butylmercaptan, n-hexylmercaptan, t-dodecylmercaptan or n-dodecylmercaptan. Particularly preferably used polymerization regulators are mercapto alcohols and mercaptocarboxylic acids.

The molecular weight regulators are preferably used in amounts of 0.05 to 10, particularly preferably 1 to 4,% by weight, based on that in the polymerization used monomers. Of course, mixtures of polymerization regulators can also be used in the polymerization.

The polymerization can be carried out at atmospheric pressure, lower or higher pressure. The polymerization temperature is not critical. In general, however, it is in the range of -20 ° - 200 ⁰ C, preferably 50 ° - 150 ⁰ C and particularly preferably 80 ° - 130 ⁰ C.

The polymerization can be carried out with or without solvent. The term of the solvent is to be understood here broadly. The preferred solvents include in particular aromatic hydrocarbons, such as toluene, xylene; Esters, in particular acetates, preferably butyl acetate, ethyl acetate, propyl acetate; Ketones, preferably ethyl methyl ketone, acetone, methyl isobutyl ketone or cyclohexanone; Alcohols, especially isopropanol, n-butanol, isobutanol; Ethers, in particular glycol monomethyl ether, glycol monoethyl ether, glycol monobutyl ether; Aliphatic, preferably pentane, hexane, cycloalkane and substituted cycloalkanes, for example cyclohexane; Mixtures of aliphatics and / or aromatics, preferably naphtha; Gasoline, biodiesel; but also plasticizers such as low molecular weight polypropylene glycols or phthalates. The solvents mentioned can be used individually or as a mixture.

The polymers of the invention are used in particular for the preparation of coating compositions, which are also the subject of the present invention. These coating compositions are distinguished by an outstanding property spectrum, which in particular comprises excellent processability and excellent quality of the resulting coating. Thus, the coating compositions of the invention can be processed in a wide temperature window, which preferably has a width of at least 20 ° C, more preferably at least 30 ⁰ C, without affecting the quality of the coating, which is characterized in particular by a high solvent and water resistance becomes.

Accordingly, a preferred coating agent at a temperature of 15 ° C, 20 ⁰ C, 30 ⁰ C or 40 ° C are processed without a significant deterioration in quality is measurable. Furthermore, the coating compositions according to the invention are very insensitive to variations in moisture during processing, so that the production of coatings with the coating compositions is very independent of weather changes.

The dynamic viscosity of the coating agent is dependent on the solids content and the type of solvent and can encompass a wide range. So this can be more than 20,000 mPas at high polymer content. Expediently, a dynamic viscosity in the range from 10 to 10 000 mPas, preferably 100 to 8000 mPas and very particularly preferably 1000 to 6000 mPas, measured according to DIN EN ISO 2555 at 23 ° C (Brookfield) is usually.

Of particular interest are, in particular, coating compositions which preferably contain from 10 to 80% by weight, particularly preferably from 25 to 65% by weight, of at least one polymer according to the invention.

In addition, a surprisingly good processability show coating compositions whose solids content is preferably at least 40% by weight, particularly preferably at least 60% by weight.

For a given solids content, the coating compositions of the invention can be processed over a much wider temperature range than previously known coating compositions. With comparable processing properties, the coating compositions of the invention are characterized by a surprisingly high solids content, so that the coating compositions of the invention are particularly environmentally friendly.

In addition to the polymers according to the invention, the coating agents set forth above may comprise at least one solvent. Examples of preferred solvents have been previously associated with free-radical polymerization so that reference is made to this. The proportion of solvent in preferred coating compositions may in particular be in the range from 0.1 to 60% by weight, particularly preferably in the range from 5 to 40% by weight, based on the total weight of the coating composition.

The coating compositions according to the invention can also contain customary auxiliaries and additives such as rheology modifiers, defoamers, deaerators, pigment wetting agents, dispersing additives, substrate wetting agents, lubricants and flow control additives, in each case in an amount of from 0% by weight to 3% by weight, based on the total formulation, and also of water repellents , Plasticizers, thinners, UV stabilizers and adhesion promoters each containing an amount of 0 wt .-% to 20 wt .-%, based on the total formulation.

Furthermore, the coating compositions of the invention may contain conventional fillers and pigments, e.g. Talc, calcium carbonate, titanium dioxide, carbon black, etc. in an amount of up to 50% by weight of the total composition.

Furthermore, the present invention provides a method for producing a coating in which a coating composition of the invention is applied to a substrate and cured.

The coating composition of the invention can be applied by conventional application methods such as dipping, rolling, flooding, casting, in particular by brushing, rolling, spraying (high pressure, low pressure, airless or electrostatic (ESTA)).

The curing of the coating agent is carried out by physical drying and by oxidative crosslinking by means of atmospheric oxygen. The oxidative curing can be accelerated by catalysts. Usually, siccatives such as compounds of cobalt, manganese, lead, zirconium, iron, cerium and vanadium or alkali metal or alkaline earth metal compounds, for example lithium, Potassium and calcium, in amounts, based on the solid, oxidatively curing binder of greater than 0 wt .-% to 7 wt .-%, preferably greater than 0 to 3 wt .-% and most preferably greater than 0 to 0.5 % By weight. If necessary, skin preventive agents such as substituted phenols, for example di-tert-butyl-p-cresol or ketoximes can be used. Furthermore, throughput dryers such as sodium perborate can be added if necessary.

The substrates which can preferably be provided with a coating composition according to the invention include, in particular, metals, in particular iron and steel, zinc and galvanized steels, as well as plastics and concrete substrates.

Moreover, the present invention provides coated articles obtainable by a method according to the invention. The coating of these objects is characterized by an excellent property spectrum.

Of particular interest is the high water resistance of coatings obtained by the coating compositions of the invention.

Preferred coatings obtained from the coating compositions according to the invention show a high König pendulum attenuation. The pendulum hardness after seven days is preferably at least 30 s, preferably at least 50 s, measured in accordance with DIN EN ISO 1522.

The coatings obtainable from the coating compositions according to the invention show high solvent resistance. Preferred coatings show particular polar solvents, in particular alcohols, for example 2-propanol, or ketones, for example methyl ethyl ketone (MEK), nonpolar solvents, such as diesel fuel (Al kanen), a excellent resistance. After an exposure of 15 minutes and subsequent drying (24 hours at room temperature), preferred coatings according to the present invention show a pendulum damping according to DIN ISO 1522 of preferably at least 20 s, preferably at least 40 s.

In addition, preferred coatings show a surprisingly good cupping. According to particular modifications of the present invention, preferred coatings can exhibit a depression of at least 1 mm, more preferably at least 3.0 mm, measured according to DIN 53156 (Erichsen).

Preferred coatings show an improved course. When measuring the surface structure by means of laser beams (= wavescan method) preferred binders and coating systems of the present invention show a shortwave of preferably at most 40 units, more preferably at most 30 units and most preferably at most 10 units.

Furthermore, preferred coatings which are obtainable from the coating compositions of the invention have a surprisingly high adhesive strength, which can be determined in particular according to the cross-cut test. Thus, in particular, a classification of 0 to 1, particularly preferably of 0 according to the standard DIN EN ISO 2409 can be achieved.

Hereinafter, the present invention will be explained by way of examples and a comparative example, without thereby restricting SOI. measurement methods

Determination of the solids content

To determine the solids content, about 0.5 g of binder solution was weighed into an aluminum dish using an analytical balance. 5 ml of acetone was added and mixed with the binder solution by panning. The acetone was evaporated in a fume hood. Subsequently, the aluminum dish was placed in the drying oven at 105 ^° C. for two hours. After cooling, the aluminum pan was weighed, then again stored for one hour in a drying oven and weighed again after cooling. If the weight is constant, the solids content of the binder solution is determined according to the following formula:

Solid binder solution in weight percent = weight solid in g x 100 / initial weight of binder solution

Determination of gloss values

The gloss values were measured according to DIN 67630. The measuring angle was 60 °.

Measurement of the dynamic viscosity

The measurement of the dynamic viscosity was carried out according to DIN EN ISO 2555 using a Brookfield viscometer at 23 ^° C.

Determination of the viscosity number

The determination of the viscosity number was carried out in accordance with DIN EN ISO 1628-1.

Determination of the molecular weight The molecular weight was determined by GPC on the basis of DIN EN ISO 55672-1. GPC columns from the manufacturer Varian / Polymer Laboratories were used, which were arranged with the pore sizes 10 ⁵ , 10 ⁶ , 10 ⁴ , 10 ³ A in succession. The individual columns were 300 mm long and had a diameter of 7.5 mm. A polymer solution with a starting concentration of 2.5 g of polymer per liter of solvent was used. It was worked with the eluent THF and a flow of 1 ml / min. The injection volume was 100 μl. The column oven is heated to 35 ⁰ C. Detection was carried out via the Rl detector Rl 150 from Thermo Electron. The evaluation of the data was carried out with the program WinGPC of the company Polymer Standard Service (PSS).

Mw denotes the weight-average molecular weight, D the polydispersity index (D = Mw / Mn, Mn = number-average molecular weight).

Determination of the glass transition temperature

The glass transition temperatures were measured with the apparatus DSC 1 from Mettler Toledo according to DIN EN ISO 11357. The glass transition temperature of the center of the glass stage of the second heating curve, with 10 ⁰ C per minute was defined.

Pendulum damping to king

The measurement of pendulum damping according to König was carried out in accordance with DIN EN ISO 1522. The coating systems according to the invention and the comparison systems were applied to glass plates with a 200 μm doctor blade and dried at room temperature (23 ° C.).

coverage

The hiding power was determined in accordance with DIN EN ISO 6504-3. On contrast maps the Y-value was determined. Pigmentation of the binder or coating agent

For pigmentation, the respective binder solution was diluted to a solids content of 60% by weight (xylene). Subsequently, a mixture comprising 66.7 wt .-% of the binder solution obtained by dilution, 20 wt .-% OO ₂ (Kronos ^® 2160), 0.23 wt .-% red pigment (Bayferrox ^® 110) and 13.3 wt % By weight of xyloo and added to 230 g of steatite balls in a 250 ml glass bottle. The well-sealed glass bottle was stored on the roller bench for 24 hours. Thereafter, the steatite balls were separated by filtration from the pigmented paint.

Surface structure by means of wavescan

To determine the surface structure, the binder solution was diluted to a solids content of 60% and knife-coated onto a CoN coating sheet in a layer thickness of 75 μm. The film was dried at room temperature.

With the help of the Wave-Scan device from BYK-Gardner, the ripple is analyzed in a range of 0.1 to 30 mm wavelength. The average values of three measurements of the longwave (LW) and the shortwave (SW) are given. The smaller the LW and SW values are, the less pronounced the wave structure is, the smoother the overall impression.

Preparation of a mixture of methacryloyloxy-2-ethyl-fatty acid amides

In a four-necked round bottom flask equipped with a saber stirrer with stirring sleeve and stirrer, nitrogen inlet, bottom thermometer and a distillation bridge were added 206.3 g (0.70 mol) of fatty acid methyl ester mixture, 42.8 g (0.70 mol) of ethanolamine and 0.27 g (0.26%) LiOH presented. The fatty acid methyl ester mixture comprised 6% by weight of saturated C12 to C16 fatty acid methyl ester, 2.5% by weight of saturated C17 to C20 fatty acid methyl ester, 52% by weight of monounsaturated C18 fatty acid methyl ester, 1.5% by weight of monounsaturated C20 to C24 Fatty acid methyl ester, 36% by weight of polyunsaturated C18 fatty acid methyl ester, 2% by weight of polyunsaturated C20 to C24 fatty acid methyl esters.

The reaction mixture was heated to 150 ⁰ C. Within 2 h, 19.5 ml of methanol were distilled off. The resulting reaction product contained 86.5%.

Fatty acid ethanol amides. The resulting reaction mixture was further processed without purification.

After cooling, 1919 g (19.2 mol) of methyl methacrylate, 3.1 g of LiOH and an inhibitor mixture consisting of 500 ppm hydroquinone monomethyl ether and 500 ppm phenothiazine were added.

While stirring, the reaction apparatus was purged with nitrogen for 10 minutes. Thereafter, the reaction mixture was heated to boiling. The methyl methacrylate / methanol azeotrope was separated and then the head temperature gradually increased to 100 ⁰ C. After completion of the reaction, the reaction mixture was cooled to about 70 ° C and filtered.

Excess methyl methacrylate was separated on a rotary evaporator. It could be obtained 370 g of product.

example 1

259 g of XyIoI were placed in a 2I jacketed reactor with paddle stirrer, reflux condenser and Stickstoffinertisierung and heated to 90 ⁰ C. 216 g of a

Monomer mixture of 450 g of n-butyl methacrylate, 297 g of methyl methacrylate, 9 g of methacrylic acid, 84 g of methacryloyloxy-2-hydroxypropyl linolsäureester and 25 g of n-dodecyl mercaptan were added to the reactor. Subsequently, 24 g of a 20% solution of dilauryl peroxide in xylene were added. After about 15 minutes, the remainder of the monomer mixture and 73 g of a 20% solution of dilauroyl peroxide in xylene within 120 minutes at 110 ⁰ C was added. After another hour Stirring at 110 ⁰ C were 29 g of a 20% solution of dilauroyl peroxide in xylene was added and stirred for one hour. The binder solution was cooled.

The weight average molecular weight determined by GPC was 17600 g / mol, the polydispersity index 1, 9.

The solids content of the binder solution was 70.2 wt .-% and the Brookfield viscosity 16800 mPas.

Example 2

242 g of XyIoI were placed in a 2I jacketed reactor with paddle stirrer, reflux condenser and Stickstoffinertisierung and heated to 90 ⁰ C. 218 g of a monomer mixture of 366 g of n-butyl methacrylate, 297 g of methyl methacrylate, 9 g of methacrylic acid, 168 g of methacryloyloxy-2-hydroxypropyl linolsäureester and 34 g of n-dodecyl mercaptan were added to the reactor. Subsequently, 24 g of a 20% solution of dilauryl peroxide in xylene were added. After about 15 minutes the rest of the monomer mixture and 108 g of a 20% solution of dilauroyl peroxide in xylene within 120 minutes at 110 ⁰ C was added. After another hour of stirring at 110 ⁰ C, 15 g of a 20% solution of dilauryl peroxide in xylene were added and stirred for one hour. The binder solution was cooled.

The weight average molecular weight determined by GPC was 15,300 g / mol, the polydispersity index was 1.9.

The solids content of the binder solution was 68.9 wt .-% and the Brookfield viscosity 3600 mPas. Example 3

295 g of XyIoI were placed in a 21-jacketed reactor with paddle stirrer, reflux condenser and Stickstoffinertisierung and heated to 90 ⁰ C. 199 g of a monomer mixture of 460 g of n-butyl methacrylate, 273 g of methyl methacrylate, 8 g of methacrylic acid, 39 g of methacryloyloxy-2-ethyl-fatty acid amide mixture and 16 g of n-dodecyl mercaptan were added to the reactor. Subsequently, 30 g of a 20% solution of dilauryl peroxide in xylene were added. After about 15 minutes the rest of the monomer mixture and 90 g of a 20% solution of dilauroyl peroxide in xylene within 120 minutes at 110 ⁰ C was added. After another hour of stirring at 110 ⁰ C, 36 g of a 20% solution of dilauryl peroxide in xylene were added and stirred for one hour. The binder solution was cooled. Example 4

313 g of XyIoI were placed in a 2I jacketed reactor with paddle stirrer, reflux condenser and Stickstoffinertisierung and heated to 90 ⁰ C. 199 g of a monomer mixture of 457 g of n-butyl methacrylate, 275 g of methyl methacrylate, 9 g of methacrylic acid, 39 g of methacryloyloxy-2-hydroxypropyl linolsäureester and 16 g of n-dodecyl mercaptan were added to the reactor. Subsequently, 30 g of a 20% solution of dilauryl peroxide in xylene were added. After about 15 minutes the rest of the monomer mixture and 91 g of a 20% solution of dilauroyl peroxide in xylene within 120 minutes at 110 ⁰ C was added. After another hour of stirring at 110 ⁰ C 9 g of a 40% solution of tert-butyl peroxyethylhexanoate in xylene were added and stirred for one hour. The last step was repeated again. The binder solution was cooled.

The weight average molecular weight determined by GPC was 23,500 g / mol, the polydispersity index 2.0. The resulting coating composition was pigmented in accordance with the procedure set out above. A coating obtained from the pigmented coating showed an opacity of 99.67% and a gloss at 60 ° of 85 gloss units.

Comparative Example 1

295 g of XyIoI were placed in a 2I jacketed reactor with paddle stirrer, reflux condenser and Stickstoffinertisierung and heated to 90 ⁰ C. 199 g of a monomer mixture of 499 g of n-butyl methacrylate, 273 g of methyl methacrylate, 8 g

Methacrylic acid and 16 g of n-dodecylmercaptan were added to the reactor.

Subsequently, 30 g of a 20% solution of dilauryl peroxide in xylene were added.

After about 15 minutes, the remainder of the monomer mixture and 90 g of a 20%

Solution of dilauryl peroxide in XyIoI within 120 minutes at 110 ⁰ C added. After another hour of stirring at 110 ⁰ C, 36 g of a 20% solution of dilauryl peroxide in xylene were added and stirred for one hour. The binder solution was cooled.

The weight average molecular weight determined by GPC was 19,300 g / mol, the polydispersity index was 1.7.

The coating agent was applied to a glass plate with a 200 μm doctor blade and dried at room temperature (23 ° C). After 1 day the pendulum attenuation after king was 38 s, after 7 days 69 s and after 1 month 85 s.

Furthermore, the flow properties were determined by means of the wave scan method described above, the measured waviness having values of 1, 6 (Longwave) and 19.3 (Shortwave), respectively. The resulting coating composition was pigmented in accordance with the procedure set out above. A coating obtained from the pigmented coating showed an opacity of 99.55% and a gloss at 60 ° of 75 gloss units.

Example 5

295 g of XyIoI were placed in a 21-jacketed reactor with paddle stirrer, reflux condenser and Stickstoffinertisierung and heated to 90 ⁰ C. 201 g of a monomer mixture of 301 g of n-butyl methacrylate, 197 g of methyl methacrylate, 9 g of methacrylic acid, 234 g of isobornyl methacrylate, 39 g of methacryloyloxy-2-hydroxypropyl linolsäureester and 16 g of n-dodecyl mercaptan were added to the reactor. Subsequently, 30 g of a 20% solution of dilauryl peroxide in xylene were added. After about 15 minutes the rest of the monomer mixture and 90 g of a 20% solution of dilauroyl peroxide in xylene within 120 minutes at 110 ⁰ C was added. After another hour of stirring at 110 ⁰ C, 36 g of a 20% solution of dilauryl peroxide in xylene were added and stirred for one hour. The binder solution was cooled.

The weight average molecular weight determined by GPC was 19,400 g / mol, the polydispersity index 1, 9.

92.4 g binder solution, 0.07 g desiccant (Borchers Dry 411 HS) and 7.6 g XyIoI were weighed into a 250 ml glass bottle and mixed with the dissolver (10 minutes at 1500 revolutions per minute).

The desiccant coating was applied to a glass plate with a 200 μm knife and dried at room temperature (23 ° C). After 1 day the pendulum attenuation after king was 49 s, after 7 days 85 s and after 1 month 127 s. In addition, the coating agent set out above showed excellent leveling properties. Thus, the ripple measured by the wave scan method described above was only values of 0.4 (long wave) and 2.4 (short wave).

The resulting coating composition was pigmented in accordance with the procedure set out above. A coating obtained from the pigmented coating showed an opacity of 99.67% and a gloss at 60 ° of 87 gloss units.

Example 6

In a 5I HWS glass reactor equipped with Inter-MIG stirrer and reflux condenser, 3200 ml of demineralized water were presented, the stirrer set to a speed of 300 revolutions per minute and heated to an external temperature of 40 ⁰ C. 200 g of polyacrylic acid and 0.5 g of potassium hydrogensulfate were added and dispersed by stirring. 605 g of methyl methacrylate, 804 g of n-butyl methacrylate, 17 g of methacrylic acid, 75 g of methacryloyloxy-2-hydroxypropyl linoleic acid ester, 16 g of peroxan LP and 32 g of ethylhexyl thioglycolate (TGEH) were mixed in a beaker and homogenized with stirring. The monomer stock solution was pumped into the reactor. The internal temperature was regulated to 85 ^° C. The polymerization was stopped as soon as the heat evolution stopped. The batch was cooled. The mother liquor was separated from the polymer beads through a filter suction filter.

The storage stability of the resulting polymer composition was determined by measuring the molecular weight. The weight average molecular weight measured by GPC was 25,000 g / mol immediately after preparation at a polydispersity index Mw / Mn of 1.7. After 3 months storage at room temperature, the weight average molecular weight was 24,000 g / mol and the polydispersity index was 1.8.

Claims

claims

A (meth) acrylate polymer for preparing a coating composition, characterized in that the (meth) acrylate polymer has a weight-average molecular weight in the range of 10,000 to 60,000 g / mol, and the

(Meth) acrylate polymer

From 0.5 to 40% by weight of units derived from (meth) acrylic monomers having in the alkyl radical at least one double bond and from 8 to 40 carbon atoms, from 0.1 to 10% by weight of units derived from acid groups; derived monomers are derived, and

50 to 99.4 wt .-% of units derived from (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical having no double bonds or heteroatoms in the alkyl radical and these (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical so selected in that a polymer consisting of these (meth) acrylates having 1 to 12 carbon atoms in the alkyl radical has a glass transition temperature of at least 40 ^° C., in each case based on the weight of the (meth) acrylate polymer.

2. (meth) acrylate polymer according to claim 1, characterized in that the (meth) acrylate polymer has at most 20 wt .-% of units derived from comonomers.

3. (meth) acrylate polymer according to claim 2, characterized in that the (meth) acrylate polymer has at most 10 wt .-% of units derived from further functionalized (meth) acrylates.

4. (meth) acrylate polymer according to claim 2 or 3, characterized in that the (meth) acrylate polymer has at most 10 wt .-% of units derived from styrene.

5. (meth) acrylate polymer according to one of the preceding claims, characterized in that the (meth) acrylate polymer

From 50 to 99.4 weight percent of units derived from methyl methacrylate and / or butyl methacrylate, based on the weight of the (meth) acrylate polymer.

6. (meth) acrylate polymer according to claim 5, characterized in that the (meth) acrylate polymer

25 to 50% by weight of units derived from methyl methacrylate and 20 to 60% by weight of units derived from butyl methacrylate, each based on the weight of the (meth) acrylate polymer.

7. (meth) acrylate polymer according to one of the preceding claims, characterized in that (meth) acrylate polymer comprises 0.1 to 99.4 wt .-% units derived from cycloalkyl (meth) acrylates.

8. (meth) acrylate polymer according to claim 7, characterized in that (meth) acrylate polymer comprises units derived from cyclohexyl methacrylate, cyclohexyl acrylate,

Cyclohexyl (meth) acrylates having at least one substituent on the ring, isobornyl acrylate and / or isobornyl methacrylate are derived.

9. (meth) acrylate polymer according to one of the preceding claims, characterized in that the (meth) acrylate polymer has a glass transition temperature in the

Range of 10 ⁰ C to 80 ⁰ C.

10. (meth) acrylate polymer according to one of the preceding claims, characterized in that the (meth) acrylate polymer has a weight average molecular weight in the range of 15,000 to 40,000 g / mol.

11. (meth) acrylate polymer according to one of the preceding claims, characterized in that the (meth) acrylate polymer has a polydispersity index M _w / M _n in the range of 1 to 10.

12. (meth) acrylate polymer according to one of the preceding claims, characterized in that the (meth) acrylate polymer a

Having molecular weight distribution with at least 2 maxima, measured by GPC.

13. (meth) acrylate polymer according to one of the preceding claims, characterized in that the (meth) acrylate polymer has an iodine value in the range of 2 to 50 iodine per 100 g of polymer.

14. Coating composition, characterized in that the coating composition has 10 to 80 wt .-% of at least one polymer according to claims 1 to 13.

15. Coating composition according to claim 14, characterized in that the solids content is at least 40 wt .-%.

16. A method for producing a coating, characterized in that a coating composition according to claim 14 or 15 is applied to a substrate and cured.

17. The method according to claim 16, characterized in that the substrate is made of metal.

18. A coated article obtainable by a process according to claim 16 or 17.