Complete set of components for curable coating compositions based on polyaspartic acid esters

Abstract

The present invention relates to a component kit for preparing a curable coating composition, preferably a curable clearcoat coating composition, comprising an isocyanate-reactive compound (A) comprising a polyaspartic acid ester compound in a first container, a polyisocyanate (B) in a second container, and a solvent (S1) selected from monoalcohols and alkoxy monoalcohols in a third container, wherein a UVA and / or HALS additive is optionally contained in the first and / or third container, and a second solvent (S2) is optionally contained in the second or third container. The present invention also relates to coating compositions prepared from the component kit, a method for preparing at least one coating on an optionally pretreated and optionally precoated substrate, and the coated substrate obtained from the method.

Description

[Technical field]

[0001] The present invention relates to a method for preparing a curable coating composition, preferably a curable clearcoat coating composition. Kit of Parts The present invention relates to a process for the preparation of a polyaspartic acid ester compound, comprising in a first container an isocyanate-reactive compound (A) comprising a polyaspartic acid ester compound, in a second container a polyisocyanate (B), and in a third container a solvent (S1) selected from monoalcohols and alkoxy monoalcohols, wherein a UVA and / or HALS additive is optionally contained in the first and / or third container, and a second solvent (S2) is optionally contained in the second and / or third container. Kit of Parts and a process for preparing at least one coating on an optionally pretreated and optionally precoated substrate, and a coated substrate resulting from the process. [Background technology]

[0002] Coating compositions based on isocyanate chemistry are well known in the art and are used in a wide variety of applications in the coatings industry, such as primers, basecoats and clearcoats, and in high quality applications such as automotive original equipment (OEM) and vehicle repair coatings. Isocyanate-based coating compositions include, for example, polyurethane or polyurea coatings formed from resins containing components such as diisocyanates, polyisocyanates, and / or isocyanate reaction products. These resins are cured by various mechanisms to form covalent bonds between the resin components, thereby producing a crosslinked polymer network. Great efforts have been made to develop coating compositions that impart desired properties to the substrate or article being coated. For example, coatings have been developed to provide protection against abrasion, chemicals, corrosion, heat, or mechanical impact.

[0003] Polyurea coatings based on polyaspartic acid esters have been used commercially in the automotive industry, especially in vehicle refinishing applications, with much success, benefiting from the generally low viscosity of aspartic acid ester compounds compared to polyols (the base of polyurethane coating compositions), and also from the high reactivity of the amino groups of aspartic acid ester compounds with the isocyanate groups of aliphatic and / or cycloaliphatic polyisocyanates.Thus, polyaspartic acid coating compositions have the property that their curing speed is faster than that of polyurethane coating compositions, even at room temperature, and their mechanical strength is excellent.

[0004] Aspartate-based coating compositions are well known in the art. For example, EP 0403921 describes coating compositions having a polyisocyanate component and a binder based on an isocyanate-reactive component containing certain secondary polyamines. These secondary polyamines are also called polyaspartic acid derivatives and are based on primary polyamines and diesters of maleic or fumaric acid. EP 0470461 also describes two-component coating compositions for vehicle refinishing applications, which contain a polyisocyanate component and an isocyanate-reactive secondary diamine prepared from 3,3'-dimethyl 4,4'-diaminodicyclohexylmethane and maleic acid diethyl ester. The isocyanate-reactive component further contains a hydroxyl-functional component consisting of a polyhydroxy polyacrylate or a mixture of a polyhydroxy polyacrylate and a polyester polyol. EP0939091A1 further discloses adding a dilution solvent to slow the reaction or interaction of the coating composition (such coating compositions contain amine functional compounds that usually reduce the pot life during storage) and not slow the reaction after application of the coating film. WO2011 / 126562A1 further discloses a polyurea coating composition comprising a reaction product of a polyaspartic acid ester component with a mixture of aliphatic and cycloaliphatic isocyanate functional materials, which improves the cure speed and adhesion to metal substrates. A high solids or solvent-free aliphatic polyaspartic acid coating composition formed by an aspartic acid ester compound and an aliphatic and / or cycloaliphatic polyisocyanate composition in which the content (mol %) of isocyanurate groups, iminooxadiazinedione groups, uretdione groups, allophanate groups, biuret groups and / or uretoneimino groups satisfies a specific relationship is disclosed in EP3594300.

[0005] However, a general drawback of the above-mentioned aspartate-based two-component coating composition is that the component containing the curable polyaspartic acid ester compound is significantly discolored by yellowing during storage.In this way, the coating composition containing the curable aspartate also tends to discolor or yellow during storage, so that, for example, the final color of the obtained coating no longer matches the desired or targeted color.

[0006] WO2004 / 063242 discloses a coating composition containing an aspartic acid compound and a polyisocyanate curing agent. The coating composition contains a disubstituted phenol antioxidant or a hydroperoxide decomposer. The presence of the antioxidant or decomposer results in a coating with good resistance to UV light. The addition of an antioxidant to a 2K coating composition containing an aspartate-based component to inhibit discoloration / yellowing during storage at room temperature or at elevated temperatures, such as 50°C, is disclosed in EP2829562A1.

[0007] WO2015 / 13050A1 further discloses that discolouration or yellowing during storage of such aspartate-based 2K coating compositions is induced by UV absorbers and proposes chain-extended aspartates as a solution.

[0008] However, it has not been possible so far to provide a technically simple and satisfactory solution to avoid this color instability or yellowing for polyaspartic acid ester-based polyurea coatings during storage, especially at elevated temperatures up to 50° C., or in combination with UV absorbers, which are generally included in coating formulations together with other light stabilizers, e.g. hindered amine light stabilizers. Furthermore, the scratch resistance of said non-yellowing polyurea coatings was to be improved without adversely affecting the pot life. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] EP0403921 [Patent Document 2] EP0470461 [Patent Document 3] EP0939091A1 [Patent Document 4] WO2011 / 126562A1 [Patent Document 5] EP3594300 [Patent Document 6] WO2004 / 063242 [Patent Document 7] EP2829562A1 [Patent Document 8] WO2015 / 13050A1 Summary of the Invention [Problem to be solved by the invention]

[0010] It is therefore an object of the present invention to provide low-temperature curing polyurea coatings based on polyaspartic acid esters, in particular polyaspartic acid ester-based multi-component coating compositions which can be used as clearcoats in automotive OEM finishing and automotive refinishing, which do not discolour or yellow on storage at room temperature (i.e. 23° C.) and at elevated temperatures (e.g. below 50° C.), in particular in the presence of commonly used UV absorbers and / or HALS additives, which are technically easy to implement, which do not adversely affect the excellent performance of polyaspartic acid ester-based polyurea coatings in terms of fast curing speed even at low temperatures, and which have excellent mechanical strength and pot life. [Means for solving the problem]

[0011] The above objectives are achieved by the subject matter set forth in the claims and by the preferred embodiments of that subject matter described below.

[0012] Thus, a first subject of the present invention is a process for the preparation of a curable coating composition comprising three separate containers C1, C2 and C3. Kit of Parts where: a) container C1 contains an isocyanate-reactive component (A) comprising a polyaspartic acid ester compound; b) container C2 contains polyisocyanate (B), c) Container C3 contains a solvent (S1), Container C2 and / or container C3, preferably container C3, optionally contains a solvent (S2), and Container C1 and / or container C3, preferably container C3, optionally contains an additive (AD), the solvent (S1) is selected from monoalcohols and alkoxy monoalcohols, preferably alkoxy monoalcohols, The solvent (S2) is a ketone, and The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0013] The above specified Kit of Parts (kit-of-parts) is hereinafter referred to as "invention Kit of Parts " or "The present invention Kit of Parts " and is therefore the subject of the present invention.

[0014] A further subject of the invention is the Kit of Parts A coating composition, preferably a clearcoat coating composition, is prepared by mixing at least containers C1, C2, and C3 of the following:

[0015] The above identified coating composition is hereinafter also referred to as the "inventive coating composition" or "the coating composition of the present invention."

[0016] Another subject of the present invention is to provide a method for preparing at least one coating layer on a substrate, said method comprising the following steps: (1) optionally applying at least one basecoat composition to at least a portion of a substrate to form at least one basecoat layer; (2) The present invention Kit of Parts or the coating composition of the present invention, to at least a portion of a substrate or directly to the at least one basecoat layer formed in step (1) to form a clearcoat layer; (3) curing the clearcoat layer formed in step (2) or, if present, curing at least one basecoat layer formed in step (1) together with the clearcoat layer formed in step (2). Includes.

[0017] The above specified method is hereinafter also referred to as the "method of the invention" or "method of the present invention".

[0018] Further subject of the invention are coatings or multi-layer effect and / or colour coatings prepared by the process according to the invention, and the compositions according to the invention. Kit of Parts or a method of using the coating composition prepared from the composition of the invention or the method of the invention for preparing a coating layer as a coating, preferably as a clearcoat, in automotive finishing, for repairing finishes, for automotive refinishing, and / or for coating parts for installation in or on automobiles, plastic substrates, or commercial vehicles, and / or for coating any type of item.

[0019] Preferred embodiments of the invention are evident from the following description and the dependent claims.

[0020] In light of the prior art, it was surprising and unpredictable for a person skilled in the art that the subject matter underlying the present invention could be achieved by a technically straightforward solution, which is to separate the component containing the polyaspartic acid ester compound not only from the polyisocyanate (B), as is commonly done in two-component coating compositions, but also from the specific solvent (S1) and the optional solvent (S2), which were identified in the course of the present invention as being the main further reason for the discoloration or yellowing of the component containing the polyaspartic acid ester upon storage. Furthermore, another source of yellowing of the component containing the polyaspartic acid ester upon storage, although less pronounced than the yellowing observed upon addition of the solvent (S1) and the solvent (S2), especially at elevated temperatures up to 50° C., was identified as resulting from the combination of UVA and HALS additives typically added in coating compositions for OEM and / or refinish applications. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] When reference is made in the context of this invention to a public standard, this means, unless otherwise stated, the version of the standard that was current on the filing date, or, if no more current version exists on that date, the last more current version.

[0022] In this disclosure, including the claims, unless otherwise indicated, all numbers expressing quantities or properties should be understood in all instances to be preceded and modified by the term "about." Thus, unless indicated to the contrary, any numerical parameters set forth in the following description may vary depending upon the desired properties sought to be obtained in the compositions and methods according to the present disclosure. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter set forth in this specification should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.

[0023] Also, any numerical range recited herein is intended to include all subranges subsumed therein. For example, a range of "1 to 10" is intended to include all subranges between (and including) the recited minimum of 1 and the recited maximum of 10, i.e., subranges with minimums of 1 or more and maximums of 10 or less. Any maximum numerical limitation recited herein is intended to include every lower numerical limitation subsumed therein, and any minimum numerical limitation recited herein is intended to include every higher numerical limitation subsumed therein.

[0024] As used herein, the grammatical articles "one", "a", "an" and "the" are intended to include "at least one" or "one or more", unless otherwise indicated. Thus, in this specification, the article is used to refer to one or more (i.e., at least one) of the grammatical object of the article. The term "at least one" in the sense of the present invention means that each compound comprises one or more compounds, preferably consists of one or more compounds. By way of example, "solvent (S1)" means one or more solvents (S1), and thus, potentially, more than one solvent (S1) is considered and may be employed or used.

[0025] The adjective "optionally" in the sense of the present invention means that the respective compound or component may or may not be present. For example, if "container C2 and / or container C3 optionally contain a solvent (S2)", said container C2 and / or container C3 may contain a solvent (S2) if such a solvent (S2) is present, or may not contain such a solvent (S2) if such a solvent (S2) is not present.

[0026] For convenience in this specification of the invention, "polymer" and "resin" are used interchangeably to encompass resins, oligomers, and polymers.

[0027] The present invention Kit of Parts According to the present invention Kit of Partsis a multi-component system comprising at least three separate components or containers C1, C2, and C3, in which the polyaspartic acid ester compound has an amino group that reacts with the preferably free or unblocked isocyanate functional group of the polyisocyanate even at room temperature and without additional curing catalyst. At least the polyaspartic acid ester compounds must be stored separately from each other before application to avoid undesired premature reactions. Surprisingly, within the present invention, it has been found that certain solvents (S1) and (S2) interact with the polyaspartic acid ester compound, resulting in undesired discoloration or yellowing of the component containing the polyaspartic acid ester compound upon storage. Thus, the solvent (S1) and also any solvent (S2) are not stored in the same compound or container as the polyaspartic acid ester compound. Another undesirable reaction between the isocyanate-reactive groups, i.e., hydroxyl groups, of the solvent (S1) and the isocyanate functional groups of the polyisocyanate (B) leads to a technically simple solution of providing a third container or component that contains at least the solvent (S1). Since the optional solvent (S2) does not prematurely interact with the polyisocyanate, the solvent (S2), if present, can be stored in the same container or component with the polyisocyanate (B), but is preferably stored with the solvent (S1) in the third component. Furthermore, it has been found that the additive package of UVA and / or HALS additives typically included in OEM or refinish coating compositions is an additional cause of discoloration or yellowing of compounds containing polyaspartic acid esters upon storage, especially at high temperatures below 50° C., although not as pronounced as the strong yellowing tendency shown here for the solvents (S1) and (S2). For this reason, the UVA and / or HALS additives, if present, are preferably included with the solvent (S1) in the third component.

[0028] Container C1 Container C1 contains an isocyanate-reactive component (A) comprising at least one polyaspartic acid ester compound. Accordingly, the isocyanate-reactive component (A) represents a crosslinkable resin, oligomer or polymer of a coating composition responsible for film formation. These resins contain functional groups that are reactive with the isocyanate functional groups of a polyisocyanate (B) that forms a crosslinked polymer network by various mechanisms.

[0029] The polyaspartic acid ester compound is also referred to as polyaspartate or polyaspartic. The compound is prepared according to U.S. Pat. Nos. 5,821,326, 5,236,741, 6,169,141, 6,911,501, and 7,276,572, and the entire disclosure of each is incorporated herein by reference.

[0030] Suitable polyaspartic acid esters for use according to the present invention include formula (I) X-[NH-C(COOR 1 )R 3 -C(COOR 2 )R 4 H] n (I) (wherein X represents an n-valent organic group that is inert to isocyanate groups at a temperature of 100 ° C or lower, preferably an aliphatic, araliphatic or alicyclic polyamine, more preferably a group obtained by removing an amino group from a diamine, and even more preferably a hydrocarbon group obtained thereby, R 1 and R 2 are the same or different and represent an organic group that is inert to isocyanate groups at a temperature of 100 ° C or lower, preferably an alkyl group containing 1 to 9 carbon atoms, and more preferably a methyl, ethyl or butyl group, or R 1 and R 2 form an alicyclic or heterocyclic ring together with the β-carbon atom, R 3 and R 4are the same or different and represent an organic group which is inert to hydrogen or to isocyanate groups at temperatures below 100° C., n is an integer of 2 or more, preferably 2 to 6, more preferably 2 to 4, and most preferably 2. Includes those corresponding to.

[0031] These polyaspartic acid esters are prepared by reacting an optionally substituted maleic or fumaric acid ester with a polyamine, as described in WO 2011 / 126562 A1, which describes suitable optionally substituted maleic or fumaric acid esters, which have the formula (II) R 1 OOC-CR 3 =CR 4 -COOR 2 (II) (In the formula, R 1 , R 2 , R 3 and R 4 is as defined above) Corresponds to.

[0032] Examples of optionally substituted maleic or fumaric acid esters suitable for use in preparing the polyaspartic acid esters include the dimethyl, diethyl and dibutyl (e.g., di-n-butyl) esters of maleic and fumaric acid, and the corresponding maleic or fumaric acid esters substituted with methyl at the 2- and / or 3-positions.

[0033] Suitable polyamines for preparing the polyaspartic acid esters include those of formula (III): X-(-NH 2 ) n (III) (wherein X and n are as defined above). Includes those corresponding to.

[0034] Polyamines include high molecular weight amines having a molecular weight of 400 to about 10,000, preferably 400 to about 6,000, and low molecular weight amines having a molecular weight of less than 400. The molecular weight is the number average molecular weight (Mn) and is determined by end group analysis (NH number). Examples of these polyamines are those in which the amino groups are attached to aliphatic, alicyclic, araliphatic and / or aromatic carbon atoms.

[0035] Suitable low molecular weight polyamines include ethylenediamine, 1,2- and 1,3-propanediamine, 2-methyl-1,2-propanediamine, 2,2-dimethyl-1,3-propanediamine, 1,3- and 1,4-butanediamine, 1,3- and 1,5-pentanediamine, 2-methyl-1,5-pentanediamine, 1,6-hexanediamine, 2,5-dimethyl-2,5-hexanediamine, 2,2,4- and / or 2,4,4-trimethyl-1,6-hexanediamine, 1,7-heptanediamine, Diamines, 1,8-octanediamine, 1,9-nonanediamine, triaminononane, 1,10-decanediamine, 1,11-undecanediamine, 1,12-dodecanediamine, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, 2,4- and / or 2,6-hexahydrotoluylenediamine, 2,4'- and / or 4,4'-diaminodicyclohexylmethane, 3,3'-dialkyl-4,4'-diamino-dicyclohexylmethane (e.g. 3,3'-dimethyl-4,4'-diamino-dicyclohexylmethane). 1,3- and / or 1,4-cyclohexanediamine, 1,3-bis(methylamino)-cyclohexane, 1,8-p-menthanediamine, hydrazine, hydrazides of semicarbazide carboxylic acid, bis-hydrazides, bis-semicarbazides, phenylenediamines, 2,4- and 2,6-toluylenediamine, 2,3- and 3,4-toluylenediamine ...3- and 2,4-toluylenediamine, 2,3- and 3,4-toluylenediamine, 2,3- and 2,4-toluylenediamine, 2,3- and 2,4-toluylenediamine, 2,3- and 2,4-toluylenediamine, 2,3- and 2,4-toluylenediamine, 2,3- and 2,4-toluylenediamine, 2,3- and 2,4-toluylenediamine, 2,3- and 2,4-toluylenediamine, 2,3- and 2,4-toluylenediamine, 2,3- and 2,3-toluylenediamine, 2,3- and 2,3-toluylenediamine, 2,3- and 2,3-toluylenediamine, ,4'- and / or 4,4'-diaminodiphenylmethane, highly functional polyphenylenepolymethylenepolyamines obtained by aniline / formaldehyde condensation reaction, N,N,N-tris-(2-amino-ethyl)amine, guanidine, melamine, N-(2-aminoethyl)-1,3-propanediamine, 3,3'diamino-benzidine, polyoxypropyleneamines, polyoxy-ethyleneamines, 2,4-bis-(4'-aminobenzyl)-aniline and mixtures thereof.

[0036] Preferred polyamines are 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane (isophoronediamine or IPDA), bis-(4-aminocyclo-hexyl)methane, bis-(4-amino-3-methylcyclohexyl)-methane, 1,6-diamino-hexane, 2-methylpentamethylenediamine, ethylenediamine, triamino-nonane, 2,4- and / or 2,6-toluylenediamine, and 4,4'- and / or 2,4'-diamino-diphenylmethane.

[0037] Suitable high molecular weight polyamines include those prepared from polyhydroxyl compounds of known polyurethanes, especially polyethers. The polyamines are prepared by reacting the polyhydroxyl compounds with an excess of the polyisocyanate (B) described below to form NCO prepolymers, followed by hydrolysis of the terminal isocyanate groups to amino groups. Preferably, the polyamines are prepared by converting the terminal hydroxyl groups of the polyhydroxyl compounds to amino groups, e.g., by amination. Preferred high molecular weight polyamines are amine-terminated polyethers, e.g., Jeffamine® resins available from Huntsman International, LLC.

[0038] The preparation of the polyaspartic acid ester compound from the above-mentioned starting materials is carried out, for example, at a temperature of 0 to 100°C, using the starting materials in such a ratio that at least one, preferably one, olefinic double bond is present in each primary amino group. After the reaction, the excess starting materials may be removed by distillation. The reaction may be carried out without a solvent or in the presence of a suitable solvent, such as methanol, ethanol, propanol, dioxane and mixtures of such solvents. Preferably, the polyaspartic acid ester compound is solvent-free.

[0039] Preferably, a polyaspartic acid ester compound is utilized having a viscosity at 25° C. of about 400 to 3000 mPa*s, preferably about 600 to 2500 mPa*s, and very preferably about 800 to 2000 mPa*s.

[0040] In another preferred embodiment, the polyaspartic acid ester compound has an equivalent weight of about 200 to 500, preferably about 210 to 400, and very preferably about 220 to 300.

[0041] In yet another preferred embodiment of the present invention, the polyaspartic acid ester compound has an amine value of about 150 to 250, preferably about 175 to 225, and very preferably about 190 to 210 mg KOH / g.

[0042] The polyaspartic acid ester compounds found to be useful in the present invention disclosed are commercially available and can be obtained, for example, as Desmophen® NH from Covestro.

[0043] The isocyanate-reactive component (A) may also contain further compounds (R), such as crosslinkable resins, oligomers or polymers having isocyanate-reactive groups and different from the above polyaspartic acid ester compounds. Examples of such further isocyanate-reactive oligomers and polymers include (i) poly(meth)acrylates, more specifically hydroxy-functional and / or carboxylate-functional and / or amine-functional poly(meth)acrylates, (ii) polyurethanes, more specifically hydroxy-functional and / or carboxylate-functional and / or amine-functional polyurethanes, (iii) polyesters, more specifically polyester polyols and polycarbonate polyols, (iv) polyethers, more specifically polyether polyols, (v) copolymers in the above polymers, and (vi) mixtures thereof. The term "poly(meth)acrylate" refers to both polyacrylates and polymethacrylates. Thus, poly(meth)acrylates are composed of acrylates and / or methacrylates and contain further ethylenically unsaturated monomers, such as alkyl(meth)acrylates, styrene or (meth)acrylic acid. The term "(meth)acryloyl" encompasses, in the sense of the present invention, methacryloyl compounds, acryloyl compounds, and mixtures thereof, respectively. However, preferably, no further compounds (R) are present in container C1 or containers C1, C2, and / or C3.

[0044] The at least one polyaspartic acid ester compound is preferably present in a total amount (solids content) of greater than about 50% by weight, preferably greater than about 65% by weight, more preferably from about 80 or 90% by weight to about 100% by weight, in each case based on the total weight of the isocyanate-reactive component (A). Most preferably, the isocyanate-reactive component (A) consists of a polyaspartic acid ester compound.

[0045] The use of at least one isocyanate-reactive component (A), preferably as a polymeric resin as part of the binder, in the amounts described above ensures the formation of a coating layer having excellent qualities, particularly adhesion, recoatability, appearance, and low temperature cure speed.

[0046] In a preferred embodiment of the invention, the container C1 comprises solvent (S1) and / or solvent (S2) in a total amount of less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably 0% by weight (or no solvent (S1) and / or solvent (S2)), in each case based on the total weight of the container C1. Thus, most preferably, the container C1 does not comprise any solvent (S1) and / or solvent (S2).

[0047] In another preferred embodiment of the invention, the container C1 comprises additives (AD) in a total amount of less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably 0% by weight (or no additives (AD)), in each case based on the total weight of the container C1. Thus, most preferably, the container C1 does not comprise any additives (AD).

[0048] In yet another preferred embodiment of the present invention, the container C1 comprises solvent (S1), solvent (S2) and / or additive (AD) in a total amount of less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably 0% by weight (or no solvent (S1), solvent (S2) and / or additive (AD)), in each case based on the total weight of the container C1. Thus, most preferably, the container C1 does not comprise any solvent (S1), solvent (S2) and / or additive (AD).

[0049] In a particularly preferred embodiment of the present invention, container C1 comprises, preferably consists of, i) an isocyanate-reactive component (A) comprising, preferably consisting of, at least one polyaspartic acid ester compound and an optional compound (R), ii) optional further additives (AD2), and iii) optional solvent (S3).

[0050] Container C2 Container C2 contains at least one polyisocyanate (B). Preferably, the polyisocyanate represents a hardener or curing agent of the multi-component coating composition. The hardener is one component of a multi-component product, which when mixed together forms a coating film with the desired properties by chemical reaction with a complementary reactive compound, i.e., a polymer resin. The isocyanate functional groups of the polyisocyanate (B) can undergo a crosslinking reaction under suitable reaction conditions with the complementary isocyanate reactive functional groups of the isocyanate-reactive component (A), e.g., the amino functional groups of the polyaspartic acid ester compound and the functional groups of any further compound (R), to form a coating or film by crosslinking of the binder. If further compounds (R) are present, the composition of the present invention can be used in combination with the isocyanate-reactive component (A) and the polyaspartic acid ester compound (B) to form a coating or film by crosslinking of the binder. Kit of Parts may also contain further crosslinkers which only undergo chemical reaction with the functional groups of further compounds (R) having isocyanate-reactive groups. The polyisocyanates and polymer resins are therefore involved in the film formation and represent the majority of the binder. The term "binder" is used in the sense of the present invention and in accordance with DIN EN ISO 4618 (German edition, date: March 2007) to refer to the crosslinkers of the present invention which are involved in the film formation upon curing. Kit of Parts Or it refers to the curable non-volatile fraction of the coating composition, excluding any pigments and fillers contained therein, and more specifically to any further compounds (R) involved in film formation with the polyaspartic acid ester compound and the polyisocyanate (B). The non-volatile fraction as the residual mass obtained by evaporation under specific conditions may be determined by the method described in the Examples section.

[0051] As used herein, the term "polyisocyanate" refers to a compound that contains two or more isocyanate groups. As used herein, the term "diisocyanate" refers to a compound that contains two isocyanate groups. Diisocyanates are therefore a subset of polyisocyanates.

[0052] Preferably, the isocyanate groups of the polyisocyanate (B) are unblocked, blocked, or a mixture of unblocked polyisocyanate and blocked polyisocyanate. Unblocked isocyanate groups are sometimes also referred to as "free" isocyanate groups.

[0053] It is particularly preferred to use an unblocked polyisocyanate, i.e., a compound containing at least two free isocyanate groups.

[0054] At least one polyisocyanate (B) may comprise a combination of an aliphatic isocyanate-functional material and an alicyclic isocyanate-functional material. The aliphatic isocyanate-functional material may comprise a reaction product of an aliphatic diisocyanate and a hydroxy-functional ether compound. The alicyclic isocyanate-functional material may comprise a reaction product of an alicyclic diisocyanate and a monofunctional alcohol compound. Each of the aliphatic isocyanate-functional material and the alicyclic isocyanate-functional material may comprise at least one functional group selected from the group consisting of isocyanurate, iminooxadiazine, uretdione, allophanate, biuret, and any combination thereof. The aliphatic and alicyclic isocyanate-functional materials may be produced from, and / or comprise, a polyisocyanate having an isocyanate functionality greater than 2.

[0055] Isocyanurates may be prepared by cyclotrimerization of polyisocyanates. Trimerization is carried out, for example, by reacting three equivalents of polyisocyanate to produce one equivalent of isocyanurate ring. The three equivalents of polyisocyanate may include three equivalents of the same polyisocyanate compound or may include various mixtures of two or three different polyisocyanate compounds. Trimerization catalysts may include, for example, phosphines, Mannich bases, and tertiary amines, such as 1,4-diaza-bicyclo[2.2.2]octane, dialkylpiperazines, and other compounds. Iminooxadiazines may be prepared by asymmetric cyclotrimerization of polyisocyanates. Uretdiones may be prepared by dimerization of polyisocyanates. Allophanates may be prepared by reaction of polyisocyanates with urethanes. Biurets may be prepared by adding a small amount of water to two equivalents of polyisocyanate and reacting at slightly elevated temperature in the presence of a biuret catalyst. Biurets may be prepared by the reaction of polyisocyanates with urea.

[0056] Polyisocyanates which find utility in the preparation of isocyanurates, iminooxadiazines, biurets, uretdiones and allophanates, and as polyisocyanates for use as crosslinkers with polymeric resins comprising at least a polyaspartic acid ester in the preparation of aliphatic and cycloaliphatic isocyanate-functional materials include aliphatic and cycloaliphatic diisocyanates, such as ethylene diisocyanate, 2,2',5 trimethylhexane diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate ("HDI"), 4,4'-diisocyanate, 5,6'-diisocyanate, 6,7'-diisocyanate, 7,8'-diisocyanate, 8,9'-diisocyanate, 10,10'-diisocyanate, 11,11'-diisocyanate, 12,12'-diisocyanate, 13,14'-diisocyanate, 14,15'-diisocyanate, 15,16'-diisocyanate, 17,17'-diisocyanate, 18,18'-diisocyanate, 19,19'-diisocyanate, 20,20'-diisocyanate, 21,22'-diisocyanate, 22,23'-diisocyanate, 23,24'-diisocyanate, 25,26'-diisocyanate, 27,28'-diisocyanate, 28,29'-diisocyanate, 29,30'-diisocyanate, 30,31'-diisocyanate, 31,32'-diisocyanate, 33,33'-diisocyanate, 34 1,12-dodecamethylene diisocyanate, 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethyl-cyclohexane (isophorone diisocyanate or "IPDI"), bis-(4-isocyanatocyclohexyl)methane ("H12MDI"), bis-(4-isocyanato-3-methyl-cyclohexyl)methane, 1,1,6,6-tetramethyl-hexamethylene diisocyanate, p- or m-tetramethylxylylene diisocyanate, and any combination thereof. The flexibility of the aforementioned polyisocyanates is improved by chain extension of the aliphatic and cycloaliphatic polyisocyanates with polyols and / or polyesters, such as the polyol and / or polyester chain extenders HDI and IPDI available from Asahi Kasei under the trademark Duranate. Additional polyisocyanates (including various diisocyanates) that find utility in the preparation of aliphatic and cycloaliphatic isocyanate-functional materials include those described in U.S. Patent Nos. 4,810,820, 5,208,334, 5,124,427, 5,235,018, 5,444,146, and 7,038,003, each of which is incorporated herein by reference in its entirety. Any combination of the polyisocyanates identified and incorporated above may also be used to prepare aliphatic and cycloaliphatic isocyanate-functional materials.

[0057] The polyisocyanate (B) may comprise, as aliphatic isocyanate-functional material, an aliphatic isocyanate polymer based on hexamethylene diisocyanate trimer (HDI homopolymer), preferably having an NCO content of more than 15, and / or an aliphatic isocyanate polymer based on hexamethylene diisocyanate (HDI), preferably having an NCO content of more than 10.

[0058] In a preferred embodiment of the present invention, polyisocyanate (B) comprises, preferably consists of, a first aliphatic isocyanate-functional material having a viscosity at 25°C of about 80 mPa*s to 500 mPa*s, preferably about 100 to 300 mPa*s, a second aliphatic isocyanate-functional material having a viscosity at 25°C of about 500 mPa*s to 1500 mPa*s, preferably about 800 mPa*s to 1300 mPa*s, and an alicyclic isocyanate-functional material.

[0059] The HDI-based aliphatic isocyanate-functional material may comprise an average isocyanate functionality of at least 4, a glass transition temperature less than -40°C, and / or a %NCO less than 10% by weight. The HDI-based aliphatic isocyanate-functional material may be essentially free of HDI isocyanurate trimers.

[0060] Polyisocyanate (B) may comprise an IPD1-based cycloaliphatic isocyanate-functional material having an average isocyanate functionality of at least 2.3, a glass transition temperature between 25° C. and 65° C., and / or a %NCO of 10% to 47% by weight.

[0061] In a preferred embodiment of the present invention, the at least one polyisocyanate (B) is present in a total amount of about 1 to 60% by weight, preferably about 5 to 50% by weight, more preferably about 10 to 40% by weight and very preferably about 15 to 40% by weight in each case. Kit of Parts is present based on the total mass of

[0062] In another preferred embodiment of the present invention, the at least one polyisocyanate (B) comprises at least one, preferably at least two, aliphatic isocyanate-functional materials and at least one cycloaliphatic isocyanate-functional material, preferably the cycloaliphatic isocyanate-functional material being present in a total amount of more than about 50% by weight, preferably more than about 60% by weight, very preferably more than about 70% by weight, in each case based on the total weight of the aliphatic and cycloaliphatic isocyanate-functional materials contained in polyisocyanate (B).

[0063] In a preferred embodiment of the invention, container C2 comprises solvent (S1) and / or additive (AD) in a total amount of less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably 0% by weight (or no solvent (S1) and / or additive (AD)), in each case based on the total weight of container C2. Thus, most preferably, container C2 does not comprise any solvent (S1) and / or additive (AD).

[0064] In another preferred embodiment of the invention, the container C2 comprises solvent (S2) in a total amount of less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably 0% by weight (or no solvent (S2)), in each case based on the total weight of the container C2. Thus, most preferably, the container C2 does not comprise any solvent (S2).

[0065] In yet another preferred embodiment of the present invention, container C2 comprises solvent (S1), solvent (S2) and / or additive (AD) in a total amount of less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight and most preferably 0% by weight (or no solvent (S1), solvent (S2) and / or additive (AD)), in each case based on the total weight of container C2. Thus, most preferably, container C2 does not comprise any solvent (S1), solvent (S2) and / or additive (AD).

[0066] In a particularly preferred embodiment of the present invention, vessel C2 comprises, preferably consists of, i) a polyisocyanate (B), ii) optional further additives (AD2), and iii) optional solvent (S3).

[0067] Container C3 The container C3 contains at least one solvent (S1). Solvent (S1) in the sense of the present invention and in accordance with DIN EN ISO4618 (English version, date: January 2015) preferably refers to a single liquid or a blend of liquids, which is volatile under the given conditions of use and is added to a coating material or composition to reduce the viscosity or affect other properties. Solvent (S1) therefore represents a thinner.

[0068] The vessel C3 contains at least one solvent (S1) chosen from monoalcohols and alkoxymonoalcohols, preferably alkoxymonoalcohols.

[0069] A monoalcohol according to the present invention is an organic compound having one hydroxyl functional group (OH) attached to a saturated carbon atom, where the saturated carbon atom is part of an alkyl group R. The monoalcohol is represented by the general formula R-OH and can be a primary (RCH 2 OH), 2nd class (R 2 CHOH) and 3rd class (R 3 Contains COH) alcohol.

[0070] An alkoxy monoalcohol according to the present invention is an organic compound of the general formula R″-O-R′OH, where R′ and R″ represent alkyl groups. Thus, an alkoxy monoalcohol may be described as an organic compound, where an alkoxy group having the general formula R″-O is attached to a monoalcohol represented by the general formula R′-OH.

[0071] The alkyl groups R, R' and R" of the general formula representing the monoalcohols and alkoxymonoalcohols according to the invention are each independently of one another of the general formula C 1 which is derived from an aliphatic hydrocarbon. m H 2m+1As used herein, the term "aliphatic" refers to an organic compound characterized by a substituted or unsubstituted linear, branched, and / or cyclic chain arrangement of constituent carbon atoms. An aliphatic compound does not contain an aromatic ring as part of the molecular structure of the compound. As used herein, the term "alicyclic" refers to an organic compound characterized by an arrangement of carbon atoms in a closed ring structure. An alicyclic compound does not contain an aromatic ring as part of the molecular structure of the compound. Thus, an alicyclic compound is a subset of an aliphatic compound. Thus, an aliphatic composition may include an aliphatic compound and / or an alicyclic compound.

[0072] Preferably in the present invention, the alkyl groups R, R', and R" of the monoalcohols and alkoxymonoalcohols are derived from unsubstituted aliphatic hydrocarbons having a linear or branched arrangement of the constituent carbon atoms.

[0073] In the present invention, alkyl groups R and R" of monoalcohols and alkoxymonoalcohols derived from unsubstituted aliphatic hydrocarbons having a linear or branched arrangement of constituent carbon atoms containing 1 or more, more preferably 2 to 6, even more preferably 3 to 4, or most preferably 4 carbon atoms, and alkyl groups R' derived from unsubstituted aliphatic hydrocarbons having a linear arrangement of constituent carbon atoms containing 1 or more, more preferably 2 to 6, even more preferably 2 to 3, or most preferably 2 carbon atoms, are particularly preferred.

[0074] Non-limiting examples of monoalcohols which are particularly suitable as solvent (S1) according to the invention are methanol, ethanol, n- and iso-propanol, and butanols, including 1-butanol (n-butanol), 2-butanol (sec-butanol), 2-methylpropan-1-ol (iso-butanol), and 2-methylpropanol (tert-butanol), particularly preferred are n- and iso-propanol, and n-, sec- and iso-butanol, most preferably iso-butanol.

[0075] A non-limiting example of an alkoxy monoalcohol that is particularly suitable as solvent (S1) according to the invention is the glycol ether, which is a group of organic compounds based on alkyl ethers of ethylene glycol or propylene glycol, such as 2-butoxyethanol.

[0076] In the most preferred embodiment of the invention, the solvent (S1) is selected from 2-methylpropan-1-ol (iso-butanol) and 2-butoxyethanol.

[0077] Preferably, the at least one solvent (S1) is present in a total amount of less than or equal to 30% by weight, preferably from 0.01 to 20% by weight, very preferably from 0.1 to 10% by weight, in each case. Kit of Parts is present based on the total mass of

[0078] In another preferred embodiment of the invention, the solvent (S1) is present in a total amount of more than 80% by weight, preferably more than 90% by weight, more preferably from 95 or 98% to 100% by weight, most preferably 100% by weight, in each case. Kit of Parts Based on the total mass of the solvent (S1) in the vessel C3, it is therefore most preferred that Kit of Parts The total mass of or the total amount of solvent (S1) present in the entirety is contained in container C3.

[0079] In yet another preferred embodiment of the present invention, container C3 comprises, preferably consists of: i) solvent (S1); ii) additive (AD); iii) optional solvent (S2); iv) optional solvent (S3); and v) optional additive (AD2).

[0080] Solvent (S2) The present invention Kit of Partsmay further comprise at least one solvent (S2) in container C2 and / or C3, where the solvent (S2) represents a ketone. If present, the solvent (S2) is preferably contained in container C3. The solvent (S2) preferably refers to a single liquid or blend of liquids, in the context of the present invention and in accordance with DIN EN ISO4618 (English version, date: January 2015), which is volatile under given drying conditions and in which the binder dissolves. The solvent (S2) is liquid at room temperature (i.e., 23 °C).

[0081] The ketones according to the present invention have the general formula R a C(=O)R b and are organic compounds having a functional group represented by the formula, where R a and R b are various carbon-containing substituents directly bonded to the carbonyl group C=O (carbon-oxygen double bond), including symmetric (substituents R a and R b being the same) and asymmetric ketones (substituents R a and R b being different or not the same). Preferably, the ketones according to the present invention are asymmetric.

[0082] Preferably, the carbon-containing substituents R a and R b according to the present invention are alkyl groups. The alkyl group R a or R b according to the present invention is any series of monovalent radicals of the general formula C p H 2p+1 derived from aliphatic hydrocarbons. Thus, the alkyl groups R a and R bis a saturated group. As used herein, the term "aliphatic" refers to an organic compound characterized by a substituted or unsubstituted straight, branched, and / or cyclic chain arrangement of constituent carbon atoms. An aliphatic compound does not contain an aromatic ring as part of the molecular structure of the compound. As used herein, the term "alicyclic" refers to an organic compound characterized by an arrangement of carbon atoms in a closed ring structure. An alicyclic compound does not contain an aromatic ring as part of the molecular structure of the compound. Thus, an alicyclic compound is a subset of an aliphatic compound. Thus, an aliphatic composition may include an aliphatic compound and / or an alicyclic compound.

[0083] In the present invention, the alkyl group R a and R b is a compound of the general formula C which is derived from an unsubstituted aliphatic hydrocarbon having a linear or branched arrangement of the constituent carbon atoms. p H 2p+1 is any series of monovalent radicals of

[0084] In the present invention, the alkyl group R a and R b are each independently of one another of the general formula C, derived from an unsubstituted aliphatic hydrocarbon having a linear or branched arrangement of the constituent carbon atoms. p H 2p+1 Particularly preferred is any series of monovalent radicals of the formula: a and / or R b is an alkyl group C containing 1 or more, more preferably 1 to 5, and even more preferably 1 or 5 carbon atoms p H 2p+1 It is.

[0085] In the present invention, the alkyl group R a and R b are each independently of one another of the general formula C, derived from an unsubstituted aliphatic hydrocarbon having a linear or branched arrangement of the constituent carbon atoms. p H 2p+1 Particularly preferred is any series of monovalent radicals of the formula: a and / or R bis an alkyl group C containing 1 or more, more preferably 1 to 5, and even more preferably 1 or 5 carbon atoms p H 2p+1 It is.

[0086] In another preferred embodiment of the invention, the ketone according to the invention is asymmetric and has the functional group R a and R b where R a and R b are each independently a group of the general formula C, which is derived from an unsubstituted aliphatic hydrocarbon having a linear or branched arrangement of the constituent carbon atoms. p H 2p+1 is any series of monovalent radicals of R a and / or R b is an alkyl group C containing 1 or more, more preferably 1 to 5, and even more preferably 1 or 5 carbon atoms m H 2m+1 It is.

[0087] In another preferred embodiment of the present invention, the solvent (S2) has the general formula R a C(=O)R b wherein R a and R b are non-identical alkyl groups attached directly to the carbonyl group C=O (carbon-oxygen double bond), and R a (or R b Each of the above) is a cyclic alkyl group having a linear arrangement of carbon atoms of the formula C, which is derived from an unsubstituted aliphatic hydrocarbon having 1 to 4, preferably 1 to 3, more preferably 1 or 2, and most preferably 1 carbon atom. p H 2p+1 and R b (or R a Each of the above) is a cyclic alkyl group having the general formula C, which is derived from an unsubstituted aliphatic hydrocarbon having a linear or branched, preferably a branched, arrangement of constituent carbon atoms containing 1 to 6, preferably 3 to 6, more preferably 4 or 5 to 6, and most preferably 5 carbon atoms. p H 2p+1 is any series of monovalent radicals of

[0088] Thus, non-limiting examples of ketones which are particularly suitable according to the invention as solvents (S2) are those of the general formula R a C(=O)R b and R is selected from asymmetric ketones represented by a is a substituent selected from methyl, ethyl, n- and iso-propyl, and butyl, including n-butyl, butan-2-yl (sec-butyl), 2-methylpropyl (iso-butyl) and tert-butyl, particularly preferably methyl, and R 4 is a substituent selected from methyl, ethyl, n- and isopropyl, n-pentyl, 2-methylbutan-2-yl (tert-pentyl), 2,2-dimethylpropyl (neo-pentyl), 3-methylbutyl (iso-pentyl), pentan-2-yl (sec-pentyl), pentan-3-yl (3-pentyl), 3-methylbutan-2-yl (sec-isopentyl) and 2-methylbutyl (active pentyl), and hexyl, including n-, iso-, tert- and neo-hexyl, particularly preferably n-pentyl, 2-methylbutan-2-yl (tert-pentyl), 2,2-dimethylpropyl (neo-pentyl), and 3-methylbutyl (iso-pentyl).

[0089] In the most preferred embodiment of the present invention, the solvent (S2) is 5-methylhexan-2-one (MIAK).

[0090] Solvent (S2) Kit of Parts If present at all, the at least one solvent (S2) is present in a total amount of not more than 30% by weight, preferably not more than 20% by weight, very preferably not more than 10% by weight in each case. Kit of Parts It is preferred that the total amount of the component (s) is present in the composition.

[0091] In another preferred embodiment of the invention, the solvent (S2) is present in the container C2 and / or in the container C3, preferably in the container C3, in a total amount of more than 80% by weight, preferably more than 90% by weight, more preferably from 95 or 98% by weight to 100% by weight, most preferably 100% by weight, in each case Kit of PartsBased on the total weight of the solvent (S2) in the mixture, it is therefore most preferred that Kit of Parts The total mass or the total amount of solvent (S2) present in the total is contained in container C2 and / or container C3, preferably container C3.

[0092] In yet another preferred embodiment of the invention, the container C1 and / or the container C2 contain a total amount of solvent (S2) of less than 5% by weight, preferably less than 1% by weight, very preferably 0% by weight (or no solvent (S2)), in each case based on the total weight of the container C1 and / or the container C2. Most preferably, the container C1 and the container C2 do not contain or are free of solvent (S2).

[0093] Therefore, another preferred embodiment of the present invention provides a process for preparing a curable coating composition comprising three separate containers C1, C2, and C3. Kit of Parts where: a) container C1 contains an isocyanate-reactive component (A) comprising a polyaspartic acid ester compound; b) container C2 contains polyisocyanate (B), c) Container C3 contains a solvent (S1), Container C2 and / or container C3, preferably container C3, contains a solvent (S2), and Container C1 and / or container C3, preferably container C3, optionally contains an additive (AD), the solvent (S1) is selected from monoalcohols and alkoxy monoalcohols, preferably alkoxy monoalcohols, The solvent (S2) is a ketone, and The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0094] Solvent (S3) The present invention Kit of Partscan further comprise in any one of the containers C1, C2 and / or C3 at least one further solvent (S3) selected from the classes of "solvents", "diluents" and "thinners" and different or not identical to the solvents (S1) and solvents (S2) commonly used in solvent-based coating compositions, such as butyl acetate, 1-methoxy-2-propanyl acetate (MPA), toluene, xylene, solvent naphtha, Solvesso 100 or Hydrosol® (from APAL), esters such as ethyl acetate, butyl acetate, pentyl acetate or ethyl ethoxypropionate, amides, methylal, butyral, 1,3-dioxolane, glycerol formal, hydrocarbons, and mixtures thereof. Preferred organic solvents (S3) are esters, very preferably n-butyl acetate and / or 1-methoxypropyl acetate and / or 2-butoxyethyl acetate.

[0095] The term "diluent" in the sense of the present invention and in accordance with DIN EN ISO 4618 (English version, date: January 2015) preferably refers to a single or blended volatile liquid, which is not a "solvent" in which the binder dissolves, but which may be used in combination with a "solvent" in which the binder dissolves, without any detrimental effects. The terms "thinner" and "solvent" according to the present invention are further defined above in the sections Solvent (S1) and Solvent (S2).

[0096] Solvent (S1), solvent (S2) and solvent (S3) are different from each other, or in other words are not the same compound.

[0097] Additives (AD) The present invention Kit of Parts The containers C1 and / or C3, preferably container C3, may contain one or more additives (AD) selected from UV absorbers (UVA) and / or hindered amine light stabilizers (HALS).

[0098] UV absorbers (UVA) are generally organic molecules capable of absorbing harmful UV light and converting it into harmless heat, and include UV absorbers from the classes of 2-(2-hydroxyphenyl)-benzotriazoles (BTZ), 2-hydroxybenzophenones (BP), hydroxyphenyl-s-triazines (HPT), and oxanilides, or mixtures thereof. Kit of Parts Suitable UVAs for use in the present invention are any commercially available UVAs known to those skilled in the art for use in polymers and coatings, and are described, for example, in VALET Andreas, BRAIG Adalbert, Light Stabilizers for Coatings, Hannover: Vincentz Network, 2017, Revised 2nd Edition, pages 23-35, the entire disclosure of which is incorporated herein by reference. UV absorbers that find utility in the disclosed invention are commercially available, for example, from BASF under the trademark Tinuvin®.

[0099] Preferably, the UVA is selected from the 2-(2-hydroxyphenyl)-benzotriazole (BTZ) UV absorber class. Examples of such preferred UV absorbers (UVA) include, but are not limited to, Tinuvin® 384.

[0100] Hindered amine light stabilizers (HALS) are sterically hindered amines used to stabilize commercial polymers, most commonly derivatives of 2,2,6,6-tetramethylpiperidine. Kit of Parts The HALS for use in is any commercially available HALS known to those skilled in the art for use in polymers and coatings, for example as described in VALET Andreas, BRAIG Adalbert, Light Stabilizers for Coatings, Hannover: Vincentz Network, 2017, Revised 2nd Edition, pages 36-45, the entire disclosure of which is incorporated herein by reference. HALS that find utility in the disclosed invention are commercially available, for example as Tinuvin® from BASF.

[0101] Preferred HALS include, but are not limited to, Tinuvin® 123, Tinuvin® 144, and Tinuvin® 292, all commercially available from BASF.

[0102] In a particularly preferred embodiment of the invention, the additive (AD) is selected from UVA and / or HALS, where the UVA is 2-(2-hydroxyphenyl)-benzotriazole and the HALS is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate and methyl 1,2,2,6,6-pentamethyl-4-piperidylsebacate.

[0103] If present, the at least one additive (AD) is present in a total amount of 0.001 to 10% by weight, preferably in a total amount of 0.01 to 5% by weight, very preferably in a total amount of 0.1 to 1% by weight, in each case Kit of Parts It is preferable that the total amount of the component (I) is based on the total amount of the component (I).

[0104] In a further preferred embodiment of the invention, the additive (AD), if present at all, is present in container C1 and / or container C3, preferably container C3, in a total amount of more than 80% by weight, preferably more than 90% by weight, more preferably 95 or 98% to 100% by weight, most preferably 100% by weight, in each case. Kit of Parts It is contained based on the total mass of the additives (AD) in the composition. Therefore, most preferably, Kit of Parts or the total amount of the entire additive (AD) (if present) is contained in container C1 and / or container C3, preferably container C3.

[0105] In yet another preferred embodiment of the invention, the container C2 contains additives (AD) in a total amount of less than 5% by weight, preferably less than 1% by weight, very preferably 0% by weight (or no additives (AD)), in each case based on the total weight of the container C2. Most preferably, the container C2 does not contain additives (AD).

[0106] Therefore, another preferred embodiment of the present invention provides a process for preparing a curable coating composition comprising three separate containers C1, C2, and C3. Kit of Parts where: a) container C1 contains an isocyanate-reactive component (A) comprising a polyaspartic acid ester compound; b) container C2 contains polyisocyanate (B), c) Container C3 contains a solvent (S1), Container C2 and / or container C3, preferably container C3, optionally contains a solvent (S2), and The container C1 and / or the container C3, preferably the container C3, contains an additive (AD), the solvent (S1) is selected from monoalcohols and alkoxy monoalcohols, preferably alkoxy monoalcohols, The solvent (S2) is a ketone, and The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0107] Another obviously preferred embodiment of the present invention is a process for preparing a curable coating composition comprising three separate containers C1, C2, and C3. Kit of Parts where: a) container C1 contains an isocyanate-reactive component (A) comprising a polyaspartic acid ester compound; b) container C2 contains polyisocyanate (B), c) Container C3 contains a solvent (S1), Container C2 and / or container C3, preferably container C3, contains a solvent (S2), and The container C1 and / or the container C3, preferably the container C3, contains an additive (AD), the solvent (S1) is selected from monoalcohols and alkoxy monoalcohols, preferably alkoxy monoalcohols, The solvent (S2) is a ketone, and The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0108] Yet another obviously preferred embodiment of the present invention is a process for preparing a curable coating composition comprising three separate containers C1, C2, and C3. Kit of Parts where: a) container C1 contains an isocyanate-reactive component (A) comprising a polyaspartic acid ester compound; b) container C2 contains polyisocyanate (B), c) Container C3 contains a solvent (S1), Container C3 contains a solvent (S2), and Container C3 contains additive (AD), the solvent (S1) is selected from monoalcohols and alkoxy monoalcohols, preferably alkoxy monoalcohols, The solvent (S2) is a ketone, and The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0109] Further Additives (AD2) The present invention Kit of Parts may further comprise in any one of the containers C1, C2 and / or C3 at least one further additive (AD2) customarily contained in coating compositions, preferably clear coating compositions. The additive (AD2) is not identical to the additive (AD). Examples of additives (AD2) are as follows: - Slip Additive - Surface-treated silica nanoparticle dispersion - antioxidants, such as sterically hindered phenol antioxidants and organophosphorus antioxidants - Polymerization inhibitors - Defoamer Wetting agents, such as siloxanes, fluorine compounds, carboxylic acid monoesters, phosphoric acid esters, polyacrylic acids and their copolymers, or polyurethanes. - adhesion promoters, e.g. tricyclodecane dimethanol - Flow Control Agent - Film-forming aids, e.g. cellulose derivatives - fillers, for example nanoparticles based on silicon dioxide, aluminum oxide or zirconium oxide, see for further details Römpp Lexikon "Lacke and Druckfarben", Georg Thieme Verlag, Stuttgart, 1998, pages 250-252 - rheology control additives, such as those known from patents WO 94 / 22968, EP-A-0276501, EP-A-0249201 or WO 97 / 12945, crosslinked polymer microparticles, such as those disclosed in EP-A-0008127, inorganic phyllosilicates, for example aluminium-magnesium silicates of the montmorillonite type, sodium-magnesium and sodium-magnesium-fluorine-lithium phyllosilicates, silicas such as Aerosils®, or synthetic polymers containing ionic and / or associative groups, such as polyvinyl alcohol, poly(meth)acrylamide, poly(meth)acrylic acid, polyvinylpyrrolidone, styrene-maleic anhydride copolymers or ethylene-maleic anhydride copolymers and derivatives thereof, or hydrophobically modified ethoxylated urethanes or polyacrylates. - Flame retardants, and / or - Water Scavenger - Curing catalyst - Pigment.

[0110] According to the present invention, Kit of PartsIt is advantageous if the polyisocyanate (B) comprises in any one of the containers C1, C2 and / or C3 at least one additive (AD2) selected from curing catalysts. Said curing catalysts mainly serve to catalyze the reaction between the functional groups of the polyisocyanate (B) and the complementary reactive functional groups of at least one isocyanate-reactive component (A), such as polyaspartate ester-based compounds or further compounds (R). The at least one catalyst is preferably selected from bismuth carboxylates, lithium carboxylates, tin carboxylates, tin mercaptides, zirconium chelates, aluminum chelates, zinc complexes, zinc carboxylates, tertiary amines and mixtures thereof, more preferably from tin carboxylates, very preferably from dioctyltin dilaurate and / or 1,4-diazabicyclo[2.2.2]octane.

[0111] Further, according to the present invention, Kit of Parts It is advantageous if any one of the containers C1, C2 and / or C3, preferably container C1, contains at least one additive (AD2) selected from dispersions of surface-treated silica nanoparticles. Said dispersions of surface-treated silica nanoparticles are commercially available, for example, from the company BYK Additives&Instruments under the name NanoBYK, namely NanoBYK 3650 and 3652. Preferably, such additive (AD2) selected from dispersions of surface-treated silica nanoparticles is present in a total amount of 0.5 to 5.0% by weight, more preferably 0.9 to 4.5% by weight, even more preferably 1.5 to 3.0% by weight, in each case in accordance with the present invention. Kit of Parts It exists based on the total amount of

[0112] Preferably, the present invention Kit of Parts does not contain any additional antioxidants or does not contain an antioxidant component that includes a sterically hindered phenol antioxidant and / or an organophosphorus antioxidant.

[0113] In another preferred embodiment of the present invention, Kit of Parts does not contain any hydroperoxide decomposers.

[0114] The at least one additive (AD2) is preferably present in a total amount of not more than 30%, very preferably in a total amount of not more than 20%, in each case in accordance with the invention. Kit of Parts It exists based on the total amount of

[0115] The present invention Kit of Parts may be used to prepare a base coat, a top coat, or a primer. Kit of Parts may contain pigments, including effect pigments, and optionally fillers.

[0116] Non-limiting examples of effect pigments that may be utilized in the basecoat and topcoat coating compositions include metallic, pearlescent, and color-variable effect flake pigments. Metallic (including pearlescent and color-variable) topcoat colors are produced using one or more special flake pigments. Metallic basecoat colors are produced using metallic flake pigments such as aluminum flake pigments, coated aluminum flake pigments, copper flake pigments, zinc flake pigments, stainless steel flake pigments, and bronze flake pigments, and / or pearlescent flake pigments, including treated mica, such as titanium dioxide coated mica pigments and iron oxide coated mica pigments, to give the coating different appearances (degrees of reflectance or color) when viewed at different angles. The metallic flakes may be corn flake type, lenticular, or cycling resistant, and the mica may be natural, synthetic, or aluminum oxide type. The flake pigments do not agglomerate and do not break down under high shear. Because high shear breaks or bends the flakes or their crystalline morphology, reducing or destroying the gonioapparent effect. The flake pigment is thoroughly dispersed in the binder component by stirring under low shear. The flake pigment(s) may be included in the coating composition in an amount of about 0.01% to about 50% by weight or about 15% to about 25% by weight, in each case based on the total binder weight. Non-limiting examples of commercially available flake pigments include PALIOCROME® pigments available from BASF Corporation.

[0117] Non-limiting examples of other suitable pigments and fillers that may be utilized in the basecoat and monocoat topcoat coating compositions include inorganic pigments such as titanium dioxide, barium sulfate, carbon black, yellow earth, sienna earth, amber, hematite, limonite, red iron oxide, transparent red iron oxide, black iron oxide, brown iron oxide, chromium oxide green, strontium chromate, zinc phosphate, silica such as fumed silica, calcium carbonate, talc, barite, ferric ammonium ferrocyanide (Prussian blue), and ultramarine, and organic pigments such as metallized and non-metallized azo reds, quinacridone reds and violets, perylene reds, copper phthalocyanine blues and greens, carbazole violets, monoarylide and diarylide yellows, benzimidazolone yellows, tolyl orange, naphthol orange, silicon dioxide, nanoparticles based on aluminum oxide or zirconium oxide, and the like. The pigment(s) are preferably dispersed by known methods in a resin or polymer or with a pigment dispersant, such as a binder resin of the type mentioned above. In general, the pigment and the dispersing resin, polymer, or dispersing agent are contacted under sufficiently high shear to break down the pigment agglomerates to primary pigment particles and to wet the surfaces of the pigment particles with the dispersing resin, polymer, or dispersing agent. The break-up of the agglomerates and the wetting of the primary pigment particles are important for the stability and color development of the pigment. The pigments and fillers may be utilized in amounts typically up to about 60% by weight, based on the total weight of the coating composition. The amount of pigment used depends on the nature of the pigment and the depth of color and / or the intensity of the effect to be produced, and also on the dispersibility of the pigment in the pigment-based coating composition. The pigment content is preferably 0.5% to 50% by weight, more preferably 1% to 30% by weight, very preferably 2% to 20% by weight, and more specifically 2.5% to 10% by weight, based in each case on the total weight of the pigment-based coating composition.

[0118] In a particularly preferred embodiment of the present invention, Kit of Partsmay be used to prepare transparent pigmented topcoat coating compositions (tinted clearcoats) as well as pigment-free clearcoat coating compositions. Kit of Parts can also contain glass flakes necessary to produce a transparent pigmented topcoat coating. The glass flakes are preferably present in an amount of 0.001 to 0.8% by weight, based on the total weight of the coating composition. Such tinted clearcoats are being used more and more frequently to expand the range of decorative effects that can be achieved when coating vehicles or other surfaces with coatings, preferably multi-layer coatings.

[0119] The present invention Kit of Parts The coating composition of the present invention prepared from The coating compositions of the present invention are multi-part products, where the term "multi-part product" describes coating materials or compositions that are supplied in two or more, e.g., three, separate components or containers and must be mixed prior to use in proportions specified by the manufacturer.

[0120] Generally, the polymer resin and the hardener or curing agent of such multi-part products are mixed only immediately prior to application. The term "immediately prior to application" is well known to those skilled in the art. The period of time during which a ready-to-use coating composition is prepared by mixing the components prior to the actual application depends on the pot life of the coating application.

[0121] The coating composition according to the present invention is Kit of Parts from, Kit of Parts The coating composition prepared in this manner is ready for application.

[0122] Preferably, the present invention Kit of Parts The coating composition of the present invention prepared from is a clearcoat coating composition.

[0123] In certain embodiments of the present invention, the coating composition is a coating composition of the present invention comprising containers C1, C2, and C3. Kit of Parts may be prepared by mixing a vessel C1 containing an isocyanate-reactive component (A) containing at least one polyaspartic acid ester compound, preferably consisting of a polyaspartic acid ester compound, and a vessel C2 containing a polyisocyanate (B) in an NH:NCO ratio of about 0.5:10 to 10:0.5, in some embodiments about 0.5:5 to 5:0.5, in some embodiments about 0.5:3 to 3:0.5, in some embodiments about 0.5:1.5 to 1:0.5, and in some embodiments 1:1. If the isocyanate-reactive component (A) also contains, in addition to the polyaspartic acid ester compound, a further compound (R) having an isocyanate-reactive group such as an OH group, in order to comply with the above-mentioned ratio of NH and further isocyanate-reactive groups:NCO, the skilled person can adjust the amount of NH functional groups of the polyaspartic acid ester compound taking into account the further isocyanate-reactive functional groups, such as OH groups, of the further compound (R).

[0124] In another preferred embodiment of the present invention, the coating composition of the present invention Kit of Parts The mixture may be prepared by mixing containers C1, C2, and C3 in a volume ratio v / v / v of about 100:90:5 to 100:110:50, preferably about 100:100:20 to 100:100:40.

[0125] Mixing may be performed manually, introducing an appropriate amount of the first component A) into a vessel and mixing it with corresponding amounts of the second component B), the third component C), and any further components. However, mixing of three or more components can also be performed automatically by an automatic mixing system. Such an automatic mixing system may include a mixing unit, more specifically a static mixer, and at least three devices, more specifically gear pumps and / or pressure valves, for feeding the isocyanate-reactive component (A), the second component (B) containing polyisocyanate, and the solvent (S1). The static mixer may be a commercially available helical mixer, which is installed in the material feed line about 50-100 cm before the sprayer. Preferably, 12-18 mixing elements (each element 1 cm long and 6-8 mm in diameter) are used to obtain sufficient mixing of the three components. To prevent clogging of the material feed line, the mixing unit is preferably programmed such that not only the helical mixer but also the downstream hose lines and the sprayer are flushed with the first component every 7-17 minutes. If the composition is applied by a robot, this cleaning operation is carried out when the robot head is in a preset stationary position. Depending on the length of the hose lines, about 50-200 ml are discarded into a catch container. A preferred variant of this procedure is a semi-continuous conveyance of the mixed release agent composition. If the composition is forced out periodically (every 7-17 minutes, also into a catch container), it is possible to reduce the amount of waste to a minimum (about 10-50 ml). In addition, cleaning may be provided for the hose lines from the mixer to the sprayer and the sprayer. This cleaning operation is particularly preferred after long downtimes of the system or at the end of a shift to ensure a long life of the equipment and a continued quality of the composition.

[0126] Both in the case of manual mixing and in the case of supplying the components for automatic mixing, the separate components preferably each have a temperature of 15-70°C, more preferably 15-40°C, and more particularly 20-30°C.

[0127] The coating composition of the present invention is a film-forming composition and is suitable as a clearcoat, basecoat, topcoat or primer. Thus, the coating composition of the present invention can contain pigments, including effect pigments, glass flakes, and optionally fillers.

[0128] Particularly preferred embodiments of the coating compositions of the present invention are in the form of transparent pigmented topcoat coating compositions (tinted clearcoats) and pigment-free clearcoat coating compositions.

[0129] According to the present invention Kit of Parts applies mutatis mutandis with respect to further preferred embodiments of the coating composition of the present invention, in particular with respect to the preferred embodiments of the isocyanate-reactive component (A) comprising at least one polyaspartic acid ester compound and optionally further compounds (R), the polyisocyanate (B), the solvent (S1), the additive (AD), and optional components such as solvent (S2), solvent (S3), and the additive (AD2) comprising a dispersion of surface-treated silica nanoparticles and / or a catalyst.

[0130] Inventive method for preparing at least one coating, preferably a multi-layer coating, on a substrate The present invention Kit of Parts The coating composition prepared from or the coating composition of the present invention is preferably used as a clearcoat composition in a method for preparing a coating, preferably a multi-layer coating, on a substrate.

[0131] A third subject of the invention is therefore a method for producing at least one coating on a substrate (S), comprising the following steps: Step (1): An optional step of applying at least one base coat composition to at least a portion of a substrate (S) to form at least one base coat layer; Step (2): Kit of Partsor the coating composition of the present invention, to at least a portion of the substrate (S) to be coated or directly to the at least one base coat layer formed in step (1) to form a coating layer, preferably a clear coat layer; Step (3): A step of curing the coating layer formed in step (2), or curing at least one base coat layer formed in step (1) (if present) together with the coating layer formed in step (2).

[0132] Process (1): In an optional step (1) of the coating method of the present invention, a base coat composition is applied to at least a part of the substrate (S) to form a base coat layer. The formation of the coating layer is preferably carried out by flashing off the applied coating composition. This usually means active or passive evaporation of volatile organic compounds present in the composition, such as thinners, diluents and solvents, for example at temperatures ranging from 5 to 120°C, preferably from 5 to 45°C or from 15 to 25°C, at a relative humidity of about 10 to 100%, preferably about 40 to 70%, for a duration of 30 seconds to 30 minutes. The composition is still flowable immediately after application and at the beginning of the flash-off, so that it is able to form a uniform and smooth coating film during the flash-off stage. However, the layer obtained from the coating composition after the flash-off is not yet ready for use. It may in fact, for example, no longer be flowable, but still be soft or tacky and only partially dried. Sometimes called dust-free time. In particular, the layer obtained from the coating composition is not yet cured, as described below.

[0133] Process (2): In step (2) of the coating method of the present invention, Kit of Partsor the coating composition of the present invention is applied to at least a portion of the substrate (S) or, if a basecoat composition has been applied to at least a portion of the substrate (S) in step (1), is preferably applied directly to the at least partially dried basecoat layer to form a coating layer, preferably a clearcoat layer. The formation of the coating layer, preferably as described above, to form a basecoat layer is preferably carried out by applying the coating composition of the present invention to at least a portion of the substrate (S) or, if a basecoat composition has been applied to at least a portion of the substrate (S) in step (1), is preferably applied directly to the at least partially dried basecoat layer to form a coating layer, preferably a clearcoat layer. Kit of Parts or the coating composition of the present invention. This usually means active or passive evaporation of volatile organic compounds present in the composition, such as thinners, diluents and solvents, at temperatures ranging from, for example, 5 to 120°C, preferably 5 to 45°C or 15 to 25°C, at a relative humidity of about 10 to 100%, preferably about 40 to 70%, for a duration of 30 seconds to 30 minutes (dust-free time). Since the composition is still flowable immediately after application and at the beginning of the flash-off, it is able to form a uniform and smooth coating film during the flash-off stage. However, the layer obtained from the coating composition after the flash-off is not yet ready for use. It may in fact, for example, no longer be flowable, but still be soft or tacky and only partially dried. In particular, the layer obtained from the coating composition is not yet cured, as described below.

[0134] Preferably, when the base coat composition is applied in step (1), the present invention Kit of Parts The application of the coating composition prepared from or the coating composition of the present invention in step (2) is carried out wet-on-wet. The technique of wet-on-wet application is known to those skilled in the art, which means that a further coating composition is applied before the previous coating composition has completely dried or cured, and then the composite film is dried as a single entity.

[0135] In another embodiment, the base coat layer is Kit of PartsThe coating composition prepared from or the coating composition of the present invention may be dried and cured prior to application.

[0136] Process (3): In step (3) of the method of the invention, in a first variant, the coating composition applied in step (2) is cured, or in a second variant, the coating compositions applied in steps (1) and (2) are cured together. This refers to the conversion of these coating compositions and polymeric materials into a usable state, meaning a state in which the components comprising said cured compositions and polymeric materials can be used and transported as intended. The cured compositions and polymeric materials are therefore in particular no longer soft or sticky, but instead tailored to a solid coating film, solid polymeric material or solid component, respectively. The film or material or component no longer shows any substantial change in its properties, such as hardness or adhesion, even when further exposed to crosslinking conditions.

[0137] In the case of compositions applied in steps (1) and / or (2), the curing is carried out by chemical curing. In the context of the present invention, the terms "chemically curable" and "chemical curing" refer, respectively, to the crosslinking of the composition (the formation of a cured composition) initiated by a chemical reaction between the functional groups of the isocyanate-reactive compound (A), the polyisocyanate (B) and optionally further reactive compounds. In the curing of a composition described as chemically curable, of course, physical curing may always also be present, referring to the interloping of polymer chains. Physical curing may even take a major proportion. Nevertheless, this type of composition is called chemically curable if it contains at least a proportion of chemically curable film-forming components. The curing can be accelerated by a catalyst, such as a curing catalyst. The curing can also be further accelerated by the energy activation of this chemical reaction by thermal energy or actinic radiation, or in addition to the addition of a catalyst, and the term "chemical curing by actinic radiation" refers to the curing of the composition by the use of electromagnetic radiation, e.g. electron beam, NIR or UV radiation. Thus, a film is a continuous layer of the applied coating composition or coating material, and the formation of the film is the transition of the applied coating composition or coating material from a liquid to a solid state by drying and / or curing. Both changes can proceed simultaneously. Thus, the processes of at least partial drying (flash-off) of the optionally applied base coat in step (1) and at least partial drying (flash-off) of the coating composition of the present invention in step (2) overlap or are closely related to the (chemical) curing in step (3). In particular, if no further energy activation such as thermal energy is provided in step (3) (which is preferred), no clear transition may be observed from the partial drying (dust-free time) to curing. Both processes occur simultaneously.

[0138] Preferably, the curing or co-curing in step (3) is carried out at a temperature of about 5-120°C, preferably about 5-45°C or about 15-25°C, at a relative humidity of about 10-100%, preferably about 40-70%, for 30-90 minutes, preferably 50-80 minutes.

[0139] It should be understood that the total time from application of the coating via optional step (1) and step (2) to the completion of step (3) to obtain a usable or cured coating will be or will be within the ranges of the sum of the flash-off times disclosed for optional steps (1) and (2) and the cure time for step (3).

[0140] The substrate (S) preferably used in the method of the present invention can be selected from metal substrates, plastic substrates and substrates containing plastic and metal parts. Suitable metal substrates are selected from aluminum substrates, copper substrates, zinc substrates, magnesium substrates and substrates consisting of alloys of these metals and steel components. The term "plastic substrate" refers to a substrate consisting of a polymeric material. Suitable polymeric materials for plastic substrates are selected from (i) polar plastics such as polycarbonate, polyamide, polystyrene, styrene copolymers, polyester, polyphenylene oxide and blends of these plastics, (ii) synthetic resins such as polyurethane RIM, SMC, BMC, ABS and (iii) polyolefin substrates of the polyethylene and polypropylene type with high rubber content, such as PP-EPDM and surface-activated polyolefin substrates. It is also possible to coat substrates consisting of the various above-mentioned materials or to coat already coated substrates, such as vehicles, aircraft or boats and their parts, in particular parts for vehicle bodywork or external installation. The substrate (S) can thus be an optionally pretreated metal or plastic substrate, coated with a base coat or preferably with a multi-layer coating having defects.

[0141] The substrate (S) may be directly coated, if desired, without a sanding operation and optionally after simple cleaning, with the coating composition according to any of steps (1) and (2) to form one or more basecoat layers and / or one or more clearcoat layers. Preferably, no primer-surfacer coat is applied to the substrate coated according to the invention, but instead a basecoat composition and / or a topcoat coating composition, more particularly a clearcoat composition, is applied directly to the substrate (S). Basecoat materials that can be used are in principle all basecoat materials conventionally used in OEM finishing or refinishing, including water-based and solvent-based basecoats. Such basecoat materials are available, for example, from BASF Coatings GmbH.

[0142] The application of the coating composition according to the method of the invention may be carried out by methods known and customary in coating technology for applying liquid coating materials, such as spraying, knife coating, curtain coating, vacuum coating, rolling, pouring, dipping, spin coating, squeegeeing, brushing or squirting, or by printing techniques such as screen, gravure, flexographic or offset printing, and also by transfer methods. Preference is given to spray application methods, such as compressed air atomization (pneumatic application), airless spray, high speed spin, electrostatic spray application (ESTA), optionally in combination with hot spray application, such as hot air (hot spray). Very particularly preferably, the coating composition of the invention is applied via pneumatic spray application or electrostatic spray application. The coating composition of the invention is applied in such a way that the coating layer preferably has a dry film thickness of 5 to 100 μm, preferably 30 to 60 μm.

[0143] The present invention Kit of Parts And what has been said regarding the coating composition of the invention also applies mutatis mutandis with regard to further preferred embodiments of the coating process of the invention.

[0144] Coated Substrates of the Invention The results of the coating process of the present invention are coatings or multilayer effects obtained from a coating composition prepared from the present invention, and / or substrates (S) coated with a color coating and / or the coating composition of the present invention. Kit of Parts Coating compositions prepared from the present invention, or the coating compositions of the present invention, or coating compositions prepared from the methods of the present invention for preparing coating layers or multi-coat layers on substrates, or coated substrates obtained from the methods of the present invention can be used in a number of fields. Examples include use in automotive finishing, for finishing repairs, for automotive refinishing, and / or for parts installed in or on automobiles, plastic substrates, or for coating commercial vehicles, and / or for coating any kind of item.

[0145] The present invention Kit of Parts Coating compositions prepared from the present invention, or the coating compositions of the present invention, or coating compositions prepared from the methods of the present invention for preparing coating layers or multi-coat layers on substrates, or coated substrates obtained from the methods of the present invention can be used in a number of fields. Examples include use in automotive finishing, for finishing repairs, for automotive refinishing, and / or for parts installed in or on automobiles, plastic substrates, or for coating commercial vehicles, and / or for coating any kind of item.

[0146] The present invention Kit of Parts What has been described about the present invention, the coating compositions of the present invention and the methods of the present invention shall apply mutatis mutandis to more preferred embodiments of the coated components of the present invention.

Examples

[0147] Hereinafter, the present invention will be described in more detail with reference to examples. However, these examples are intended to illustrate the present invention and should not be construed as limiting the scope of the present invention. Those of ordinary skill in the art will understand that modifications of the examples are possible within the scope of the present invention, which is defined only by the claims. Hereinafter, the terms "parts", "%", and "ratio" in the examples represent "parts by mass", "% by mass", and "mass ratio", respectively, unless otherwise specified.

[0148] Method of determination Solid content (solids, non-volatile fraction) The non-volatile fraction was determined in accordance with ASTM D2369 (date: 2015). In this procedure, 2 g of the sample was weighed into a pre-dried aluminum dish, the sample was dried at 110 °C for 60 minutes in a drying cabinet, cooled in a desiccator, and then reweighed. The residue relative to the total amount of the introduced sample corresponds to the non-volatile fraction.

[0149] Determination of number-average and mass-average molecular weights The number-average molecular weight (M n ) was determined by gel permeation chromatography (GPC) in accordance with DIN55672-1 (March 2016). This method can also be used to determine, in addition to the number-average molecular weight, the mass-average molecular weight (M w ) and the polydispersity d (the ratio of the mass-average molecular weight (M w ) to the number-average molecular weight (M n ). Tetrahydrofuran was used as the eluent. The determination was carried out against polystyrene standards. The column material consisted of a styrene-divinylbenzene copolymer.

[0150] Yellowness As an index of yellowness, the APHA color of the sample was determined by spectrophotometry and expressed in platinum / cobalt units (Pt / Co units) in accordance with DIN EN ISO6271:2015. Values exceeding 100 were considered unacceptable.

[0151] Scratch resistance performance after polishing As an index of the scratching resistance after polishing, a sample of the coating material to be tested was applied by the method according to the present invention in a wet-in-wet manner. In the first step, a commercially available black aqueous base coat was applied to a Bonder metal panel (coated with a commercially available cathodic electrodeposition coating and a commercially available conventional solvent-based primer surfacer) with a dry film thickness of 16 μm ± 2 μm using a gravity feed cup gun, and the base coat layer was dried at a temperature of 21°C ± 2°C and a relative humidity of 50% ± 10% for 15 minutes (dust-free time). In the second step, the coating material to be tested was applied to the previously applied base coat layer of the first step with a dry film thickness of about 40 μm ± 5 μm using a gravity feed cup gun. Drying of the coating material to be tested and curing of the multi-coat layer formed from the base coat layer and the coating material to be tested were completed after 90 minutes at a temperature of 21°C ± 2°C and a relative humidity of 50% ± 10%.

[0152] After storing for 2 hours at ambient temperature, the sanding site was applied to a cured clear coat panel (using a 3M eccentric compressed air vibrating sander, 10,000 rpm, sanding disk: 3M Finesse-it Trizact50079). This sanding site was then polished with a polishing paste in a coarse polishing process (rotary polishing operation 800 - 1000 rpm, paste: 3M50417 Fast Cut Plus sanding paste, polishing pad: 3M50487 green polishing foam) and a finer polishing process (rotary polishing operation 1200 - 1500 rpm, paste: 3M80349 Perfect-it Extra Fine Plus polishing paste, polishing pad: 3M50488 yellow polishing foam). After removing the polishing paste with a microfiber cloth, the appearance of scratching and gloss retention of the polished surface were visually inspected and classified on a scale from 3 (unacceptable, scratches with a length of 3.0 cm or more can be observed with the naked eye at a distance of 50 cm) to 1 (acceptable, no visible scratches or scratches with a length of less than 0.5 cm can be observed with the naked eye at a distance of 50 cm).

[0153] Pot life Pot life is defined as the time at which the kinematic viscosity of the test sample exceeds 24 s in a DIN 4 mm cup (DIN 53211) at 23° C. A pot life of at least 28 minutes is acceptable.

[0154] material Desmophen® NH1420, a polyaspartic acid ester (amine number 195-205) prepared from bis-(4-aminocyclohexyl)-methane, Covestro AG, Germany.

[0155] Desmodur® N3600, an aliphatic isocyanate polymer based on hexamethylene diisocyanate trimer (HDI homopolymer) (NCO content 23.0, viscosity 1100 mPas*s at 25° C., equivalent weight 183, solids content 100%), Covestro, Germany.

[0156] Desmodur® Z4470MPA / X, an aliphatic polyisocyanate based on isophorone diisocyanate trimer (IPDI trimer) (NCO content 11.9, viscosity 1500 mPas*s at 25° C., equivalent weight 360, solids content 70% in 1-methoxypropyl acetate-2 / xylene 1:1), from Covestro, Germany.

[0157] Tolonate™X FLO100, an aliphatic isocyanate polymer based on hexamethylene diisocyanate (HDI) (NCO content 12.3±1.0%, viscosity 140±80 mPas*s at 25° C., equivalent weight 341, solids content 100%), Vencorex, France.

[0158] Tinuvin® 384, liquid UV absorber (UVA) with chemical structure: 95% benzenepropanoic acid, 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy-, C7-9-branched and linear alkyl esters, 5% 1-methoxy-2-propyl acetate, BASF SE, Germany.

[0159] Tinuvin® 292, a liquid hindered amine light stabilizer (HALS) having the chemical structures a) bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and b) methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate, BASF SE, Germany.

[0160] BYK302, polyether modified polydimethylsiloxane, Byk Chemie GmbH, Germany.

[0161] NanoBYK3650, a dispersion of surface-treated silica nanoparticles, Byk Chemie GmbH, Germany.

[0162] The solvent n-butyl acetate is commercially available from BASF SE, Germany, Oxea GmbH, Germany, or Ineo.

[0163] The solvent 5-methylhexan-2-one (MIAK) is commercially available from Eastman.

[0164] The solvent 2-methylpropan-1-ol (isobutanol) is commercially available from BASF SE, Germany, Oxea GmbH, Germany, Ineos, or Sasol.

[0165] The solvent 2-butoxyethan-1-ol is commercially available from BASF SE, Germany, Ineos, Dow, USA, or Sasol.

[0166] The solvent 1-methoxy-2-propanyl acetate (MPA) is commercially available from BASF SE, Germany, Shell, or Dow, USA.

[0167] The solvent 4-methylpentan-2-one (MIBK) is commercially available from Arkema, Celanese USA, Dow USA, Eastman, Sasol or Shell.

[0168] The solvent xylene is commercially available from Total, Arsol, or Raffenerie Heide.

[0169] 1. Preparation of a component containing polyaspartic acid ester, UVA and / or HALS additives

[0170] The components of the coating composition were formulated using the polyaspartic acid ester Desmophen® NH1420 in combination with typical UVA and / or HALS additives as shown in Table 1.

[0171] [Table 1]

[0172] The color stability of the components containing polyaspartic ester and UVA and / or HALS additives was examined by APHA color determination, as described above, immediately after mixing the components (t=0) and after storage at 50° C. for 1 week, 2 weeks, and then 3 weeks.

[0173] The results in Table 1 clearly show that, compared to the very slow increase in APHA color for formulation (1A) (formulation (1A) does not contain any UVA or HALS additives or additional solvents), the addition of Tinuvin® 292 as an exemplary HALS additive (formulation 1B), Tinuvin® 384 as an exemplary UVA additive (formulation 1C), or the addition of a combination of HALS and UVA additives as a typical UVA / HALS package (formulation 1D) resulted in a significant increase in APHA color over time, with the formulations containing the HALS additive already achieving an acceptable yellowness index of just 100 after 3 weeks of storage at 50° C. Thus, the addition of Tinuvin® 292 and / or Tinuvin® 384 to the same composition containing polyaspartic acid ester as an exemplary UVA / HALS additive results in yellowness during storage.

[0174] 2. Preparation of components containing polyaspartic ester, UVA and HALS additives and selected organic solvent

[0175] The components of the coating composition were formulated as shown in Table 2, combining the polyaspartic acid ester Desmophen® NH1420 with typical UVA and HALS additives and selected solvents.

[0176] [Table 2]

[0177] The color stability of the components containing polyaspartic acid ester, UVA and HALS additives, and certain solvents was examined by APHA color determination, as described above, immediately after mixing the components (t=0), and after storage at 50° C. for 1 week, 2 weeks, and then 3 weeks.

[0178] The results in Table 2 show that already within one week of adding the hydroxyl-containing organic solvents 2-methylpropan-1-ol (formula 2F) and 2-butoxyethan-1-ol (formula 2G) to the formulations, a strong increase in the APHA color of the components was observed, while the addition of organic solvents without free hydroxyl groups, such as 1-methoxy-2-propanyl acetate, 4-methylpentan-2-one and xylene (formulas 2H-2J), showed a slower, but still acceptable, increase in APHA color as an indicator of yellowing after three weeks of storage at 50° C.

[0179] Thus, 2-methylpropan-1-ol and 2-butoxyethan-1-ol, as examples of hydroxyl functional monoalcohols and alkoxy monoalcohols, when combined with polyaspartic esters and UVA / HALS packages, caused strong yellowing during storage.

[0180] 3. Preparation of a multi-component coating composition from three separately prepared components (A), (B), and (C)

[0181] Three separately prepared components (A), (B), and (C) of the multi-component coating composition according to the present invention were blended, where component (C) contained the total amount of UVA additive, HALS additive, and 2-butoxyethan-1-ol as an exemplary alkoxy monoalcohol of the entire multi-component coating composition. Further, the non-pigmented coating composition according to the present invention was prepared by vigorously mixing and homogenizing the separately prepared components (A), (B), and (C) in a volume ratio v / v / v of 100 parts A+100 parts B+10 parts C, as shown in Table 3.

[0182] [Table 3]

[0183] The color stability of the three individual components A, B, and C was examined by APHA color determination according to the method described above immediately after mixing the individual components (t=0) and after storage at 50° C. for 1 week, 2 weeks, and then 3 weeks.

[0184] The results in Table 3 show that the APHA color of component A, which contains polyaspartic acid ester and n-butyl acetate as an organic solvent (solvents that do not contain free hydroxyl groups or are ketones), is very stable and low. The same is true for component B, which contains a combination of three isocyanate group-containing compounds and n-butyl acetate. Only the third component C, which contains UVA and HALS additives and 2-butoxyethan-1-ol as an exemplary alkoxy monoalcohol, showed a small, non-significant increase in APHA color of 20 points after three weeks of storage at 50°C.

[0185] A multi-component non-pigmented coating composition V1 was prepared by vigorous mixing of three separate components (A), (B), and (C). Direct determination of APHA color (t=0) showed a low value of 40, identical to the initial value of APHA color determined immediately after mixing of the components of formulations 2E-2J. With a pot life of about 37 minutes at room temperature (23° C.) after mixing of the components, no further measurements of APHA color could be performed.

[0186] 4. Preparation of a multi-component coating composition comprising three separately prepared components (A), (B), and (C) containing an additive (AD2) selected from a dispersion of surface-treated silica nanoparticles

[0187] In another set of experiments, multi-component coating compositions were prepared as described above in section 3, Table 3 for coating V1, whereby, in addition to the above given formulation for coating V1, additives (AD2) selected from dispersions of surface-treated silica nanoparticles (Nanobyk3650) were added to component (A) in total amounts of 0%, 2%, 4% and 10% by weight, respectively, based on the total weight of component (A). Thus, additives (AD2) selected from dispersions of surface-treated silica nanoparticles were added in total amounts of 0%, 0.9%, 1.9% and 4.5% by weight, respectively, based on the total weight of the coating composition, respectively. Thus, further coating compositions V2, V3 and V4 of the invention were prepared, as shown in Table 4.

[0188] [Table 4]

[0189] The pot life of coating compositions V1-V4 was determined by the method described above immediately after mixing the individual components. The results in Table 4 show that with increasing amounts of surface treated nanoparticle dispersion (NanoBYK3650) added, the pot life decreases from 37 minutes (Coating V1, 0%), over a still acceptable 29 minutes (Coating V3, 4%), to an unacceptable 15 minutes (Coating V4, 10%).

[0190] The scratch resistance performance after polishing of coatings V1-V4 according to the invention was determined by the above method. The results in Table 4 show that the scratch resistance performance after polishing improves with increasing amount of surface treated nanoparticle dispersion (NanoBYK3650) added to the coating formulation.

[0191] Furthermore, the gloss retention after 6 weeks of reflow of coating V3 was determined by scratches applied by a linear abrasion tester (Crockmeter) with 2 μm and 9 μm abrasive papers from 3M at an angle of 20° in strict accordance with DIN 55654:2015-08. Good gloss retention values ​​of 68% and 67% were obtained.

[0192] An optimal balance between the requirements for acceptable pot life and high scratch resistance performance after sanding appeared to be achieved with inventive coating composition V3, which contained 4 wt. % of the surface treated nanoparticle dispersion (NanoBYK3650).

Claims

1. A kit of parts comprising three separate containers C1, C2 and C3, wherein: the contents of container C1, the contents of container C2, and the contents of container C3 are mixed together to prepare a curable coating composition; a) the contents of container C1 contain an isocyanate-reactive component (A) comprising a polyaspartic acid ester compound; b) the contents of container C2 contain polyisocyanate (B), c) the contents of container C3 contain a solvent (S1); the contents of container C2, the contents of container C3, or both the contents of container C2 and the contents of container C3 contain all the solvent (S2) present in the kit of parts or no solvent (S2) is present in the kit of parts; and the contents of container C1, the contents of container C3, or both the contents of container C1 and the contents of container C3 contain all additives (AD) present in the kit of parts or no additives (AD) are present in the kit of parts; the solvent (S1) is selected from monoalcohols, alkoxy monoalcohols, and combinations of monoalcohols and alkoxy monoalcohols; The solvent (S2) is a ketone, and The additive (AD) is selected from a UV absorber, a hindered amine light stabilizer, and a combination of a UV absorber and a hindered amine light stabilizer; A kit of parts, characterized in that an additive (AD2) selected from a dispersion of surface-treated silica nanoparticles is present in the kit of parts in a total amount of 5.0 mass % or less, based on the total weight of the kit of parts, or an additive (AD2) selected from a dispersion of surface-treated silica nanoparticles is not present in the kit of parts.

2. 2. The kit of parts according to claim 1, wherein the contents of container C1 comprise solvent (S1), solvent (S2) and / or additive (AD) in a total amount of less than 10% by weight, in each case based on the total weight of the contents of container C1, or wherein the contents of container C1 do not comprise solvent (S1), solvent (S2) and / or additive (AD).

3. 3. The kit of parts according to claim 1 or 2, wherein the monoalcohol is selected from methanol, ethanol, n- and iso-propanol, and butanols including 1-butanol (n-butanol), 2-butanol (sec-butanol), 2-methylpropan-1-ol (iso-butanol), and 2-methylpropanol (tert-butanol).

4. 4. The kit-of-parts according to any one of claims 1 to 3, wherein the alkoxy monoalcohol is selected from glycol ethers.

5. The solvent (S2) is represented by the general formula R ａ C(=O)R ｂ In the formula, R ａ and R ｂ are non-identical alkyl groups directly attached to the carbonyl group C=O, R ａ is a compound of the general formula C which is derived from an unsubstituted aliphatic hydrocarbon having a linear arrangement of constituent carbon atoms containing 1 to 4 carbon atoms. ｐ H ２ｐ＋１ and R ｂ is a general formula C which is derived from an unsubstituted aliphatic hydrocarbon having a linear or branched arrangement of constituent carbon atoms containing 1 to 6 carbon atoms ｐ H ２ｐ＋１ 5. The kit-of-parts according to claim 1 , wherein the aryl group is a cyclic or cyclic radical selected from the group consisting of aryl, aryl, aryl and aryl.

6. The kit-of-parts according to any one of claims 1 to 5, wherein the solvent (S2) is 5-methylhexan-2-one.

7. 7. The kit of parts according to claim 1, wherein the total amount of additives (AD) selected from UV absorbers, hindered amine light stabilizers and a combination of UV absorbers and hindered amine light stabilizers based on the total weight of the additives (AD) in the kit of parts is contained in a container C3.

8. The kit-of-parts of any one of claims 1 to 7, wherein the polyaspartic acid ester compound has an equivalent weight of 200 to 500.

9. 9. The kit-of-parts according to any one of claims 1 to 8, wherein any one of the contents of containers C1, C2 and / or C3 comprises an additive (AD2) selected from a dispersion of surface-treated silica nanoparticles.

10. 10. The kit-of-parts of claim 1, wherein the at least one polyisocyanate (B) comprises at least one aliphatic isocyanate-functional material and at least one cycloaliphatic isocyanate-functional material.

11. A kit-of-parts described in any one of claims 1 to 10, wherein the at least one polyisocyanate (B) comprises at least one aliphatic isocyanate-functional material and at least one cycloaliphatic isocyanate-functional material, the cycloaliphatic isocyanate-functional material being present in a total amount of more than 50 mass% based on the total mass of the aliphatic and cycloaliphatic isocyanate-functional materials contained in the polyisocyanate (B).

12. A coating composition prepared from the kit-of-parts according to any one of claims 1 to 11 by mixing the contents of at least containers C1, C2 and C3.

13. 13. The coating composition of claim 12, wherein the contents of vessel C1 containing the isocyanate-reactive component (A) comprising at least one polyaspartic ester compound and the contents of vessel C2 containing the polyisocyanate (B) are mixed in an NH:NCO ratio of 0.5:10 to 10:0.

5.

14. The following steps: (1) providing a substrate (S) on which no base coat layer is formed, or applying at least one base coat composition to at least a portion of the substrate to provide a substrate (S) on which at least one base coat layer is formed; (2) applying a coating composition prepared from the kit-of-parts according to any one of claims 1 to 11, or a coating composition according to claim 12 or 13, to at least a portion of the substrate, or directly to the at least one base coat layer formed in step (1), to form a coating layer; (3) curing the coating layer formed in step (2) or, if present, curing at least one basecoat layer formed in step (1) together with the coating layer formed in step (2); A method for preparing at least one coating on a substrate (S), comprising:

15. 15. The method according to claim 14, wherein the substrate (S) is a pretreated or non-pretreated metal or plastic substrate coated with a base coat or with a multi-layer coating.

16. A coated substrate (S) obtained by the method according to claim 14 or 15.

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