section Home
Production, Amateur
Radio amateur
Model aircraft, rocket-
Useful, entertaining 		Stealth master
Electronics
Physics
Technologies
invention 		space Mystery
Earth Mysteries
Secrets of the Ocean
Stealth
section Map
Start
Forum
Use of material is permitted for reference (for websites - hyperlinks)
INVENTION
Russian Federation Patent RU2260611

Atomizes the coating composition

Atomizes the coating composition

Name of the inventor: Klinkenberg Hague (NL); Jan Cornelis VAN Belen (NL)
The name of the patentee: Akzo Nobel NV (NL)
Address for correspondence: 129010, Moscow, ul. Boris Spassky, 25, p.3, Ltd. "Gorodissky and Partners", pat.pov. E.E.Nazinoy
Starting date of the patent: 2001.05.23

The invention relates to a composition for spray coating, comprising a) at least one isocyanate-reactive compound comprising at least one thiol group, b) at least one polyisocyanate-functional compound and c) a catalyst comprising at least one organic metal compound where the metal is a metal from groups 3-13 of the periodic table. The invention relates to the use and composition for spray coating as a transparent coating layer, to its use as a clear coating layer in multi-layer lacquer coating, and its use in the refinish and for finishing large transportation vehicles.

DESCRIPTION OF THE INVENTION

The invention relates to a sprayable coating composition, to its use as a clear coating layer, to its use as a clear coating layer in multi-layer lacquer coating, and its use for refinishing surfaces of products and finishing large transportation vehicles.

Coatings used for painting cars and recovery and "revival" of the original color, must have good physical properties such as hardness, mechanical strength and resistance to water, acids and solvents. Coatings and should have a good appearance, which means that the film formed must be smooth, shiny and distinct. In addition, it is desirable that all of these properties for a long time remained under the influence of weather factors.

Given the environmental factors necessary to use a coating composition which can be easily applied by spraying a composition containing a low-volatile organic compounds. Coatings containing organic solvents with a low volatility, generate less solvent, and thereby contaminated atmosphere to a lesser extent.

U.S. Patent №4788083 discloses a sprayable coating composition comprising a hydroxyl compound, an isocyanate, a metal catalyst selected from tin, bismuth, and a molar excess of a complexing agent such as a mercapto compound. Although tin and bismuth catalysts are known metal catalysts for the reaction of the hydroxyl group with an isocyanate group, it was found that these metal catalysts do not catalyze the reaction of thiol group with an isocyanate group. Further, a mercapto compound used in U.S. Patent №4788083 for complex formation and thus to deactivation of the catalyst metal. Activation of the metal catalyst is carried out by heating or by adding an activator in the form of a tertiary amine. Thus, reaction of the hydroxyl group with an isocyanate group begins only when the metal catalyst is activated.

The present invention relates to a sprayable coating composition comprising

a) at least one isocyanate-reactive compound (i.e. a compound comprising functional groups reactive with an isocyanate group) comprising at least one thiol group,

b) at least one polyisocyanate-functional compound and

c) a catalyst comprising at least one organic metal compound where the metal is a metal of groups 3-13 of the periodic table.

Surprisingly it has been found that the sprayable coating composition may be obtained when the reaction of a thiol with isocyanates catalyzed in the presence of an organometallic compound wherein the metal is a metal of Groups 3-13 of the Periodic Table, at both room temperature and at higher temperatures, for example such as 60 ° C. It was shown that at all temperatures observed an excellent storage ability in the bank. Another advantage is the fact that in this case a coating composition is not required to add the tertiary amine-type activator. Said addition would have a negative effect on the bank retentivity of the coating composition. Furthermore, the spray coating composition of the present invention has excellent properties such as mentioned above, which are necessary for its re-use in polishing surfaces of products and finishing large transportation vehicles.

Although applicants do not intend to go into any details of the theoretical, they have suggested that the ability of the organometallic compound to hydrolysis plays an important role in the mechanism of the reaction of thiol compounds with isocyanates. Therefore, the reaction between thiol-containing compounds and isocyanates is significantly different from the reaction between isocyanates and hydroxyl compounds in the presence of metal catalysts.

U.S. Patent №5849864 discloses a sprayable coating composition comprising polimerkaptosmolu, polyisocyanate and catalyst complex with tin. Tin forms a complex with a sulfonic acid. On standing with an amine catalyst complex becomes activated. It was found that the tin catalyst complexes do not catalyze the reaction of thiol compounds with isocyanates. In addition, as mentioned above, this fact makes it difficult to use the amine in coating compositions.

International patent application WO 98/15585 discloses a sprayable coating composition comprising a hydroxyl compound, an isocyanate and a catalyst which is the reaction product of an orthoester of titanium, zirconium, hafnium or aluminum, or a beta-diketone and beta-ketoester complexing agent such as mercapto. The catalyst as such can be used in an amount ranging from 0.005 to 0.5% by weight. with respect to the weight of the reaction mixture. Although merkaptosoderzhaschee compound and is present in the coating composition, but in such small quantities that international patent application no WO 98/15585 describes a coating composition according to the present invention.

Patent JP-A-04-063823 discloses a building material for sealing, comprising a compound having two or more thiol groups per molecule, a polyisocyanate compound and a metal soap. The patent does not disclose or suggest any methods for preparing a sprayable coating composition nor its application for applying a transparent cover layer with the above properties.

U.S. Patent №5064871 discloses a composition comprising isocyanate-reactive compound, a polyisocyanate and a catalyst comprising a bismuth carboxylate, and zirconium. Although the use of a polymercaptan as isocyanate reactive compound and has been mentioned in the description, but the examples are only in respect of the polyol resin. Furthermore, the composition is used in particular as an adhesive. The patent does not disclose or suggest any methods for preparing a sprayable coating composition nor its application for applying a transparent cover layer with the above properties.

U.S. Patent №4312971 discloses a composition comprising an organic compound containing at least two active hydrogen atoms and a polyisocyanate, the catalyst containing the organic zirconium compound and an organic mercury compound. Although the use of aliphatic thiols as the organic compound containing at least two active hydrogen atoms, and mentioned in the description, but examples are given only in respect of the polyol resin. Furthermore, the composition is used in particular for the production of polyurethanes and cellular neyacheistyh rigid and flexible foams. The patent does not disclose or suggest any methods for preparing a sprayable coating composition nor its application for applying a transparent cover layer with the above properties.

Patent JP-A-10182786 discloses a sealant comprising a polymer having two or more thiol groups per molecule, a polyisocyanate compound and an organometallic compound. Although the description mentions that the organic mercury compound and organolead compound, and can be used, but only organotin compounds exemplified. As previously mentioned, tin does not catalyze the reaction of thiol group with an isocyanate group. Furthermore, in the patent JP-A-10182786 does not disclose or suggest any methods for preparing a sprayable coating composition nor its application for the transparent cover layer with the above properties.

The use of organometallic compounds, such as complexes of zirconium, hafnium and aluminum, in reactions of interaction of the hydroxyl group with an isocyanate group are disclosed in Publication Florio J., Paint & Coatings Industry, October 1997, pp.110-120, and U.S. Patent №5846897. However, it does not describe or suggest these publications on the idea that these complexes can be used in the reaction of thiol group with an isocyanate group.

The catalyst comprises at least one organometallic compound wherein the metal is a metal of groups 3-13 of the periodic table. Preferably the metal is a transition metal. More preferably, the metal is a metal of Group 4 of the periodic table.

Organometallic compounds are metal salts and / or complexes of organic compounds. The organic compounds are groups having 2 to 40 carbon atoms, optionally comprising atoms such as O, N, and S. The metal salts are anions selected from the groups of carboxylates. Examples thereof include propionate, butyrate, pentanoate, 2-ethylhexanoate, naphthenate, oxalate, malonate, succinate, glutamate, and adipate. Metal complexes represent ligands selected from the group consisting of beta-diketones, alkyl acetoacetates, alcoholates, and combinations thereof. Examples of such ligands include acetylacetone (2,4-pentanedione), 2,4-heptanedione, 6-methyl-2,4-heptadione, 2,4-octanedione, propoxide, isopropoxide and butoxide. Preferably the organometallic compound is a metal complex.

Examples of metals are aluminum, titanium, zirconium and hafnium. Examples of metal complexes include aluminum complexed with 2,4-pentanedione (K-HS5218 KAT® ex King Industries), aluminum triacetyl, tetraatsetilatsetonat zirconium, zirconium tetrabutoxide (Tyzor® NBZ ex Dupont), titanium tetrabutoxide (Tyzor® TBT ex Dupont) zirconium complexed with 6-methyl-2,4-heptadione, K-HS6212 KAT® ex King Industries, aluminum triisopropoxide and titanium diizopropoksid 2,4-bis (pentadionat) (Tyzor® AA ex Dupont). These catalysts may be used in an amount of from 0.01 to 10% by weight. based on the curable material, preferably 0.1 to 5% by weight.

Examples of isocyanate-reactive compound containing at least one thiol group include a thiol group with a compound containing at least two thiol groups and a compound containing at least one thiol group and one hydroxyl group. Also, mixtures thereof may be used in the compositions according to the present invention.

Suitable thiol-containing compounds are generally prepared by reacting the compounds containing hydroxyl group with acids having a thiol group such as 3-mercaptopropionic acid, 2-mercaptopropionic acid, thiosalicylic acid, mercaptosuccinic acid, mercaptoacetic acid, or cysteine. Examples of suitable hydroxyl containing compounds include diols, triols and tetraols, such as 1,4-butanediol, 1,6-hexanediol, 2,2-dimethyl-1,3-propanediol, 2-ethyl-2-propyl-1,3-propanediol 1,2-, 1,3- and 1,4-cyclohexane diols, and the corresponding cyclohexane dimethanol, 1,1,1-trimethylol propane, 1,2,3-trimethylol propane, and pentaerythritol. Examples of compounds prepared in this method include pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (2-mercaptoacetate), trimethylolpropane tris (3-mercaptopropionate), trimethylolpropane tris (2-mercaptopropionate) and trimethylolpropane tris (2-mercaptoacetate). Good results have been obtained with trimethylol propane tris (3-mercaptopropionate) and pentaerythritol tetrakis (3-mercaptopropionate).

The following example of the compound obtained in this manner is a compound consisting of a hyperbranched polyol core based on a starter polyol, e.g., trimethylol propane, and dimethylol propionic acid. Said polyol is subsequently esterified with 3-mercaptopropionic acid and isononanoic acid. These methods are described in European Patent Application EP-A 0 448224 and International Patent Application WO 93/17060.

Other methods for synthesis of compounds containing at least two thiol functional groups include:

- Reacting an aryl halide or alkyl halide with NaHS to introduce a pendant thiol group into the alkyl and aryl compounds, respectively;

- Reacting the Grignard reagent with sulfur to introduce a pendant thiol group into the structure;

- Interaction polymercaptan with a polyolefin according to a Michael addition reaction, a nucleophilic reaction, an electrophilic reaction or a radical reaction;

reacting a polyisocyanate with an alcohol containing a thiol functional group and the reduction of disulphides.

The compound having at least one thiol functional group and one hydroxyl functional group may for example have a structure according to the following formula: T [(C 3 H 6O) n CH 2 SNONSN 2 SH] 3, where T is the triol such as trimethylolpropane or glycerol. An example of such a compound is commercially available compound from Henkel under the trademark Henkel Capcure® 3/800.

Alternatively, the isocyanate-reactive compound comprising at least one thiol group is a resin having a polyester resin as a base of esters, polyurethane resin, polyester resin and polyacrylate resin is from ethers. Furthermore, said isocyanate reactive compounds may contain hydroxyl groups.

The isocyanate-reactive compound comprising at least one thiol group may be a polyester prepared from (a) at least one polycarboxylic acid or reactive derivatives thereof, (b) at least one polyol, and (c) at least one carboxylic acid containing a thiol functional group. The polyesters preferably possess a branched structure. Branched polyesters are conventionally obtained through condensation of polycarboxylic acids or reactive derivatives thereof such as the corresponding anhydrides or lower alkyl esters, with polyalcohols, when at least one of the reactants is at least 3 functional groups. Examples of suitable polycarboxylic acids or reactive derivatives thereof are tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydrophthalic anhydride, methylhexahydrophthalic acid, methylhexahydrophthalic anhydride, dimetiltsiklogeksandikarboksilat, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, 5-tretbutilizoftalevaya acid, trimellitic anhydride, maleic acid, fumaric acid, succinic acid, succinic anhydride, dodecenyl succinic anhydride, dimethyl succinate, glutaric acid, adipic acid, dimethyl adipate, azelaic acid, and mixtures thereof.

Examples of suitable polyols include trimethylol propane, trimethylol ethane, glycerol, 1,2,6-hexanetriol, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 2-methylpropane-1,3-diol, neopentyl glycol, 2-butyl-2- ethyl-1,3-propanediol, cyclohexane-1,4-dimethylol, the monoester of neopentyl glycol and hydroxypivalic acid, hydrogenated bisphenol A, 1,5-pentanediol, 3-metilpentandiol, 1,6-hexanediol, 2,2,4-trimetilpentan- 1,3-diol, dimethylol propionic acid, pentaerythritol, ditrimethylolpropane, dipentaerythritol, and mixtures thereof.

Examples of suitable organic acids containing thiol functional groups include 3-mercaptopropionic acid, 2-mercaptopropionic acid, thiosalicylic acid, mercaptosuccinic acid, mercaptoacetic acid, cysteine, and mixtures thereof.

Optionally, monocarboxylic acids and monoalcohols may be used to synthesize polyesters. Preferably, the C 4 -C 18 mono-carboxylic acids and C 6 -C 18 monoalcohols. Examples of C 4 -C 18 monocarboxylic acids include pivalic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, 2-ethylhexanoic acid, isononanoic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, isostearic acid, stearic acid, hydroxystearic acid, benzoic acid, 4-tretbutilbenzoynuyu acid and mixtures thereof. Examples of C 6 -C 18 monoalcohols include cyclohexanol, 2-ethylhexanol, stearyl alcohol, and 4-tretbutiltsiklogeksanol.

Good results can be obtained using an aqueous polyurethane dispersion containing thiol groups, which are prepared by first synthesizing a polyurethane having isocyanate groups from diols, diisocyanates and formation of blocks containing groups which facilitate the stabilization of the resin in water dispersion, followed by reaction, containing isocyanate groups with a polyfunctional thiol addition reaction catalyzed by a base, followed by dispersion in water.

The isocyanate-reactive compound comprising at least one thiol group may be a polyacrylate containing thiol functional groups. Such a polyacrylate is synthesized from the hydroxy-functional acrylic monomers such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, other acrylic monomers such as (meth) acrylic acid, methyl (meth) acrylate, butyl (meth) acrylate, optionally in combination with vinyl containing derivative such as styrene, and the like, or mixtures thereof, wherein the terms (meth) acrylate and (meth) acrylic acid refer to both methacrylate and acrylate, and also to methacrylic acid and acrylic acid, respectively. The thiol group is introduced by the reaction product of dimethyl-m-isopropenyl benzyl isocyanate and mercapto ethanol. Alternatively, glycidyl methacrylate is introduced into the polymer to give a polyacrylate containing epoxy functionality. Then epoxy is reacted with the above-mentioned suitable organic acids containing thiol functional groups. Polyacrylate synthesized by conventional methods, for example by slow addition of appropriate monomers to a solution of an appropriate polymerization initiator, such as initiator, an azo or peroxy initiator.

In addition, the coating compositions of the invention may include diluents containing two, three or more thiol functional groups, such as ethane dithiol or bis-beta-mercapto-ethylsulfide. Preference is given to the use of high-molecular compounds containing thiol functional groups, which may be prepared by reacting a polythiol-functional compound with a polyisocyanate.

Preferably the isocyanate-reactive compound comprising at least one thiol group is derived from a polyester compound. Examples of such compounds include the aforementioned product of the reaction of compounds containing hydroxyl groups, with acids containing thiol groups, and the above polyester prepared from (a) at least one polycarboxylic acid or reactive derivatives thereof, (b) at least one polyol, and (c) at least one carboxylic acid containing a thiol functional group. The most preferred compound containing a thiol functional group is pentaerythritol tetrakis (3-mercaptopropionate).

The organic polyisocyanate includes polyfunctional, preferably free polyisocyanates with an average content of NCO functional groups of from 2.5 to 5, and they may naturally be (cyclo) aliphatic, araliphatic or aromatic. The polyisocyanate may include biuret, urethane, uretdione, and isocyanurate derivatives. Examples of these organic polyisocyanates include 1,6-diisocyanatohexane, isophorone diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, diphenylmethane diisocyanate, 4,4'-bis (isocyanatocyclohexyl) methane, 1,4-diizotsianatobutan, 1,5-diizotsianato- 2,2-dimethylpentane, 2,2,4-trimethyl-1,6-diisocyanatohexane, 1,10-diizotsianatodekan, 4,4-diizotsianatotsiklogeksan, geksagidrotoluoldiizotsianat-2,4, 2,6-geksagidrotoluoldiizotsianat, norbornane, 1,3- xylylene diisocyanate, 1,4-xylylene diisocyanate, 1-isocyanato-3- (isocyanatomethyl) -1-methyl cyclohexane, m- . - ' '-tetrametilksililendiizotsianat Their aforementioned derivatives, and mixtures thereof. Typically, these products are liquid at ambient temperature and commercially available in a wide range. Particularly preferred isocyanate curing agents are triisocyanates and adducts. Examples of such curatives are 1,8-diisocyanato-4- (isocyanatomethyl) octane, the adduct of 3 moles of toluene diisocyanate to 1 mole of trimethylol propane, the isocyanurate trimer of 1,6-diisocyanatohexane, the isocyanurate trimer of isophorone diisocyanate, the uretdione dimer of 1,6-diisocyanatohexane, the biuret trimer of 1, 6-diisocyanatohexane, the adduct of 3 moles of m- . - ' '-tetrametilksilendiizotsianata To 1 mole of trimethylol propane, and mixtures thereof. Preferred are cyclic trimers (isocyanurates) and uretdiones of 1,6-hexane diisocyanate and isophorone diisocyanate. Usually these compounds contain small quantities of their higher molecular weight homologues.

Optionally, the coating composition of the present invention may contain an organic hydrophilic polyisocyanate compound substituted with non-ionic groups such as C 1 -C 4 alkoxy polyalkylene oxide groups. Preferably, 30% by weight. non-ionic groups will be present throughout the solid polyisocyanate compound, more preferably 20 wt.%, most preferably 15% by weight. Preferred are the isocyanurates of 1,6-hexane diisocyanate and isophorone diisocyanate substituted with methoxypolyethylene glycol.

Optionally, a compound with a hydroxyl functional group containing at least two hydroxyl-functional groups may be present in the curable material. A compound with the hydroxyl functional group containing at least two hydroxyl-functional groups may be selected from polyester polyols, polyether polyols, polyacrylate polyols, polyurethane polyols, cellulose acetate butyrate, epoxy resins containing hydroxyl functional groups, alkyds, and dendrimeric polyols such as described in international patent application WO 93/17060. Furthermore, there may be included monomers and oligomers containing hydroxyl functional groups, such as castor oil and trimethylolpropane. A preferred polyol is an acrylate polyol. More preferred is an acrylate polyol available Akzo Nobel Resins, having the tradename Setalux® 1157.

The polyisocyanate and isocyanate-reactive groups should be mixed such that the ratio of isocyanate groups to isocyanate-reactive groups is in the range of 0.5-3: 1, preferably 0,75-2,5: 1 and more preferably 2.1: 1 . It is preferred that at least 10% of isocyanate-reactive groups are thiol groups, more preferably at least 25%, most preferably at least 50%.

If the coating compositions are compounds containing hydroxyl functional groups, the catalysts may be present for the crosslinking of isocyanate groups with hydroxyl groups. Examples of catalysts include catalysts based on Sn, such as dibutyltin dilaurate and dibutyltin diacetate.

The polyisocyanate may be mixed with the isocyanate reactive compound by any suitable method. However, simply stirring usually is sufficient. It may sometimes be suitable dilution of the polyisocyanate somewhat with an organic solvent like ethyl acetate or 1-methoxy-2-propyl acetate to reduce its viscosity.

Optionally a ketone based chelating agent may be added to the coating composition. Examples of such chelating agents include beta-dicarbonyls, alpha-gidroksilketony, fused aromatic beta-hydroxy ketones dialkilmalonaty, acetoacetic esters, alkyl lactates and alkilpiruvaty. beta dicarbonyls preferably used, such as acetyl. Ketone based chelating agent to be used in an amount up to 10 wt%. based on solids, preferably up to 5% by weight.

The composition according to the present invention may be a water-based composition, a solvent based composition or a solvent-free composition. Since the composition may be composed of liquid oligomers, it is especially suitable for use as a high-hardness of the composition or solvent-free composition. Alternatively, the coating composition of the present invention may be an aqueous dispersion of a powder coating, wherein the isocyanate-reactive compound comprising at least one thiol group has a Tg above 20 ° C. The coating composition may be used in powder coating compositions and hot melt coatings compositions. Preferably, the theoretical volatile organic compounds (VOC) in the composition is less than about 450 g / l, more preferably less than about 350 g / l, most preferably less than about 250 g / l.

Furthermore, the coating composition may contain other ingredients, additives or auxiliaries, such as pigments, dyes, emulsifiers (surfactants), pigment dispersion aids, leveling agents, agents against cratering, defoamers, wetting agents, anti-sagging, heat stabilizers, UV absorbers, antioxidants and fillers.

The coating composition can be applied to any substrate. The substrate may be, for example, metal, plastic, wood, glass, ceramic, or some other coating layer. The other coating layer may comprise a coating composition according to the present invention, or may be a different coating composition. The coating compositions of the present invention are particularly useful as a clear coating layers, base coats, pigmented topcoats, primers and fillers. Preferably, the coating composition of the present invention can be used for forming a transparent coating layer or as a primer.

The coating compositions may be applied by conventional means, such as via a spray, brush or roller, and spray application is preferred. Preferred curing temperatures are between 0 and 100 ° C and more preferably between 20 and 60 ° C. The compositions are particularly suitable for the preparation of coated metal substrates, such as for refinishing the surface of products, in particular in a body shop to repair automobiles and transportation vehicles and finishing large transportation vehicles such as trains, trucks, buses, and airplanes.

The composition according to the present invention is suitable for application by an external mixing apparatus, wherein a liquid composition comprising at least one isocyanate-functional compound and at least one isocyanate-reactive compound is sprayed by the gun, with a small amount of catalyst . Such a device is described for example in international patent application WO 98/41316. Due to the very effective use of the catalysts, the compositions of the present invention have very short curing times, which makes this method specifically suitable for these compositions.

If the coating composition is applied as a transparent cover layer, the base layer may be a conventional base layer known in the field of coatings. Examples of the base coating layers are solvent based such Autobase® ex Akzo Nobel Coatings BV, based on cellulose acetobutyrate, acrylic resins and melamine resins, and the base coating layers based on water, such Autowave® ex Akzo Nobel Coatings BV, based on an acrylic dispersion resin and polyester resin. Furthermore, the base coat may comprise pigments (dyes, metallics and / or nacre), wax, solvents, additives, flow agents, neutralizing agent, and defoamers. and can be used high-hardness basecoats. Such, for example, based on polyols, imines, and isocyanates. Composition forming a transparent coating layer deposited on the surface of the base layer and then cured. The intermediate curing step may be introduced to the base coating layer.

The invention may be illustrated by the following examples. Of course, these examples are presented only for a better understanding of the invention; in any case they are not considered as limiting the scope of the invention.

CLAIM

1. Spray coating composition comprising

a) at least one isocyanate-reactive compound comprising at least one thiol group,

b) at least one polyisocyanate-functional compound

c) a catalyst comprising at least one organic metal compound where the metal is a metal of Groups 3-13 of the Periodic Table, characterized in that it is designed for refinishing and finishing large transportation vehicles.

2. The composition of claim 1, wherein the metal is a transition metal.

3. The composition of claim 2, wherein the metal is a metal of Group 4 of the Periodic Table.

4. The composition of claim 1, wherein the metal is selected from the group consisting of aluminum, titanium, zirconium and hafnium.

5. A composition according to any one of claims 1-4, characterized in that the organometallic compound is a metal complex compound.

6. The composition according to claim 5, characterized in that the metal complexes comprise ligands selected from the group consisting of beta-diketones, alkyl acetoacetates, alcoholates, and combinations thereof.

7. A composition according to any one of claims 1-6, characterized in that the coating composition to the chelating reagent added based on the ketone.

8. A composition according to any one of claims 1-7, characterized in that at least 50% of isocyanate-reactive groups are thiol groups.

9. A composition according to any of claims 1-8 wherein the isocyanate reactive compound comprising at least one thiol group is derived from a polyester compound.

10. A composition according to any one of claims 1-9, characterized in that it is a clear coating composition.

11. The composition according to claim 10, characterized in that it is intended for the laminated transparent paint.

print version
Publication date 18.01.2007gg