Thermoplastic polyurethane coating composition

Abstract

The present invention relates to a method for coating the inner surface of a substrate with at least one thermoplastic polyurethane coating composition. The present invention also relates to a coated substrate having an inner surface coated with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax. The present invention also relates to the use of at least one thermoplastic polyurethane coating composition for coating the inner surface of a substrate, wherein the thermoplastic polyurethane coating composition comprises a polyurethane and at least one wax. The thermoplastic polyurethane coating composition comprises a polyurethane and at least one wax. The method limits the amount of organic impurities, such as oligomeric cyclic ethers 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD) and 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro), leaching from the coated surface of the substrate when the coated surface of the substrate comes into contact with water.

Description

[Technical Field]

[0001] The present invention relates to a method for coating the interior surface of a substrate with at least one thermoplastic polyurethane coating composition. The present invention further relates to a coated substrate having an interior surface coated with at least one thermoplastic polyurethane coating composition. The present invention further relates to the use of at least one thermoplastic polyurethane coating composition for coating the interior surface of a substrate.

[0002] Background of the Invention Polyurethane (PU) is a general term for polymers obtained by the reaction of isocyanates or polyisocyanates with polyols. Types of polyurethanes include rigid, semi-rigid, and flexible foams; thermoplastic polyurethanes; and various other types that can be employed as coatings, adhesives, and sealants.

[0003] Polyurethanes are used in a wide variety of different applications. For various applications, their properties are tailored to provide optimal processing or application characteristics. For example, polyurethanes are used to coat substrates, including pipeline coatings. In particular, polyurethanes are used to apply impermeable linings to the interior surfaces of pipelines. This helps prevent corrosion of the interior surface of the pipeline and salt buildup on the pipeline after extended use.

[0004] The use of polyurethanes as coatings for the surfaces of substrates is known in the state of the art and is described, for example, in the following references:

[0005] U.S. Patent No. 6,730,353 describes a coating suitable for drinking water pipelines. The two-component coating system includes a first part containing one or more aliphatic polyisocyanates and a second part containing one or more aromatic polyamines, which, when mixed and applied to the interior surface of the pipeline, form a fast-setting, impermeable coating suitable for contact with drinking water.

[0006] EP 0936235 describes a coating comprising a combination of a liquid epoxide resin, an aliphatic polyisocyanate and a difunctional amine to produce a high performance fast setting lining system.

[0007] Polyurethanes generally contain various organic impurities, such as oligomeric cyclic ethers 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD) and 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro). These organic impurities are low-molecular-weight oligomeric cyclic ethers that can slowly vaporize at high temperatures and tend to leach into water and common organic liquids that come into contact with polyurethane. The leaching of organic impurities adversely affects the quality of water or common organic liquids. Furthermore, the presence of organic impurities in polyurethanes also leads to weight loss and undesirable dimensional changes in the polyurethane product. Therefore, various governments have established regulations regarding the minimum amount of such organic impurities present in drinking water. Specifically, the allowable limit for oligomeric cyclic ethers in drinking water in some jurisdictions is less than 100 μg / L. The acceptable limit for 2,4,7,9-tetramethyldec-5-yne-4,7-diol (TMDD) in drinking water is less than 20 μg / L.

[0008] It is therefore important that polyurethane-containing coatings do not release such organic impurities into water when such coatings come into direct contact with water or common organic solvents. Concentrations of impurities above acceptable limits can directly or indirectly affect levels that are protective for human health or alter the odor or flavor of the water.

[0009] One such group of relevant organic impurities is oligomeric cyclic ethers. Polyurethanes made from polytetrahydrofuran (poly-THF) can contain as much as 7-15 wt% of oligomeric cyclic ether by-products. The presence of oligomeric cyclic ethers in polymers or oligomers is undesirable for several reasons. First, the ethers are non-functional impurities, potentially resulting in an economic disadvantage for purchasers of such polymers or oligomers, as up to 7.0-15.0 wt% of the purchased material may not contain reactive hydroxyl groups and therefore may be useless for the intended purpose. Second, when these oligomers are used to prepare polyurethanes, the presence of oligomeric cyclic ether by-products tends to degrade the polyurethane's properties.

[0010] There is therefore a need to provide a method for coating the inner surface of a substrate which does not release organic impurities, particularly oligomeric cyclic ethers, above acceptable limits, or at least reduces any release, when said substrate is in direct contact with water or organic liquids.

[0011] It is therefore an object of the present invention to provide a method for coating the interior surface of a substrate with a thermoplastic polyurethane coating composition. Another object of the present invention is to provide a coated substrate having an interior surface coated with a thermoplastic polyurethane coating composition. Furthermore, it is desirable that the amount of impurities leaching from the coated substrate be reduced to a low level, preferably to a rate that ensures that water or organic liquids contacting the substrate remain within acceptable limits.

[0012] Summary of the Invention Surprisingly, it has been found that the present method for coating the interior surface of a substrate with a thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax provides a product having desirable properties.

[0013] Additionally, the present method for coating the interior surface of a substrate with a thermoplastic polyurethane coating composition has also been found to prevent the leaching of organic impurities into water, such as oligomeric cyclic ethers, 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD) and 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro).

[0014] One aspect of the present invention is a method for coating an interior surface of a substrate with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, the polyurethane comprising: a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C2-C 20 Aryl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, m is an integer from 2 to 8, and n is an integer from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2is selected from a linear or branched, substituted or unsubstituted C2 to C20 alkyl group, a substituted or unsubstituted C2 to C20 aryl group, a linear or branched, substituted or unsubstituted C7 to C20 arylalkyl group, a linear or branched, substituted or unsubstituted C2 to C20 alkylene group, and a linear or branched, substituted or unsubstituted C3 to C20 cycloalkyl group; and p is an integer from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, relates to a method.

[0015] Another aspect of the present invention relates to a coated substrate having an interior surface coated with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax.

[0016] Yet another aspect of the present invention relates to the use of at least one thermoplastic polyurethane coating composition for coating the interior surface of a substrate.

[0017] Another aspect of the present invention relates to a thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax.

[0018] Another aspect of the present invention relates to a method of forming a thermoplastic polyurethane coating composition.

[0019] Detailed Description of the Invention Before the present compositions and formulations of the present invention are described, it is to be understood that the invention is not limited to the particular compositions and formulations described, as such compositions and formulations may, of course, vary. It is also to be understood that the terms used herein are not intended to be limiting, since the scope of the present invention will be limited only by the appended claims.

[0020] Hereinafter, when a group is defined as including at least a certain number of embodiments, this also preferably encompasses groups consisting of only those embodiments. Furthermore, the terms "first," "second," "third," or "a," "b," "c," etc. in the specification and claims are used to distinguish between similar elements and do not necessarily describe a sequential or chronological order. Terms so used are interchangeable under appropriate circumstances, and it is understood that the embodiments of the present invention described herein may operate in sequences other than those described or illustrated herein. When the terms "first," "second," "third," or "(A)," "(B)," and "(C)" or "(a)," "(b)," "(c)," "(d)," "i," "ii," etc. refer to steps in a method, use, or assay, there is no consistency in time or time intervals between the steps; i.e., steps may be performed simultaneously or there may be time intervals of seconds, minutes, hours, days, weeks, months, or even years between such steps, unless otherwise indicated in the application, as described herein above or below.

[0021] Furthermore, ranges defined throughout this specification are inclusive of the endpoints, i.e., a range of 1 to 10 means that both 1 and 10 are included in the range. For the avoidance of doubt, applicants are entitled to any equivalents under applicable law.

[0022] In the following sections, different aspects of the present invention are defined in more detail. Each aspect so defined can be combined with any one or more of the other aspects, unless expressly indicated otherwise. In particular, any feature indicated as being preferred or advantageous can be combined with any one or more of the other features indicated as being preferred or advantageous.

[0023] References herein to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the claimed invention. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification may, but do not necessarily all refer to the same embodiment.

[0024] Furthermore, particular features, structures, or characteristics may be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from this disclosure, in one or more embodiments. Furthermore, although some embodiments described herein include some features but not other features included in other embodiments, combinations of features from different embodiments are intended to form different embodiments within the scope of the present invention, as understood by one of ordinary skill in the art. For example, in the following claims, any of the claimed embodiments may be used in any combination.

[0025] Oligomeric cyclic ethers are non-functional impurities, and their presence in polyurethanes above optimal levels can be economically disadvantageous to purchasers. Furthermore, the presence of oligomeric cyclic ether impurities in polyurethanes tends to degrade the properties of the polyurethanes. Furthermore, the leaching of oligomeric cyclic ethers in water adversely affects the quality of water or common organic solvents. Therefore, polyurethanes with higher amounts of organic impurities, such as oligomeric cyclic ethers, may not be suitable for use as pipe liners.

[0026] Indeed, there is a need to provide a method for coating the interior surface of a substrate, which method does not result in the substrate releasing organic impurities, particularly oligomeric cyclic ethers, beyond acceptable limits when the coated interior surface is in direct contact with water or organic liquids.

[0027] This object is achieved by a method for coating the interior surface of a substrate with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, which limits the amount of organic impurities, such as the oligomeric cyclic ethers 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD) and 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro), that leach from the coated surface of the substrate when the coated surface of the substrate comes into contact with water.

[0028] This object is achieved in particular by a method for coating the interior surface of a substrate with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax. In particular, the polyurethane is obtainable by a process comprising reacting at least one polyether polyol, at least one polyisocyanate, and at least one diol, wherein the polyether polyol is not -(CH2)4-.

[0029] One aspect of the present invention is a method for coating an interior surface of a substrate with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, the polyurethane comprising: a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, m is an integer from 2 to 8, and n is an integer from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, and p is an integer from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, relates to a method.

[0030] In a preferred embodiment, the present invention provides a method for coating an interior surface of a substrate with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, wherein the polyurethane comprises: a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 is an alkyl group, m is an integer from 2 to 8, and n is an integer from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a substituted or unsubstituted C7-C 20 is an arylalkyl group, and p is an integer from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, relates to a method.

[0031] In a more preferred embodiment, the present invention provides a method for coating an interior surface of a substrate with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, wherein the polyurethane comprises: a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C6 alkyl group, m is an integer from 2 to 8, and n is an integer from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a substituted or unsubstituted C 10 ~C 15 is an arylalkyl group, and p is an integer from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and R 1 is not -(CH2)4-, relates to a method.

[0032] The term "alkyl" as used herein refers to a group of the general formula C p H 2p+1 It refers to an acyclic saturated aliphatic group containing a straight or branched chain alkyl saturated hydrocarbon radical represented by the formula: where p represents the number of carbon atoms, such as 1, 2, 3, etc.

[0033] In one embodiment, alkyl is a substituted or unsubstituted, straight or branched chain C-C 20 Refers to alkyl groups. C2-C 20 Alkyl is selected from ethyl, propyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, and eicosanyl. In a preferred embodiment, alkyl is selected from ethyl, propyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, and eicosanyl.

[0034] The term "alkenyl" refers to a group of the general formula C p H 2p-1 It refers to unsubstituted, straight-chain acyclic unsaturated aliphatic groups, including straight-chain alkenyl unsaturated hydrocarbon radicals, represented by the formula: where p represents the number of carbon atoms, such as 1, 2, 3, 4, etc.

[0035] In one embodiment, alkenyl is 1-propenyl, 1-butenyl, 1-pentenyl, 1-hexenyl, 2-hexenyl, 1-heptenyl, 2-heptenyl, 1-octenyl, 2-octenyl, 1-nonenyl, 2-nonenyl, 1-decenyl, 2-decenyl, 1-undecenyl, 2-undecenyl, 1-dodecenyl, 2-dodecenyl, 1-tridecenyl, 2-tridecenyl. substituted or unsubstituted, straight-chain C2-C alkyl esters selected from 1-tetradecenyl, 1-tetradecenyl, 2-tetradecenyl, 1-pentadecenyl, 2-pentadecenyl, 1-hexadecenyl, 2-hexadecenyl, 1-heptadecenyl, 2-heptadecenyl, 1-octadecenyl, 2-octadecenyl, 1-nonadecenyl, 2-nonadecenyl, 1-eicosenyl and 2-eicosenyl; 20 refers to alkenyl.

[0036] The term "cycloalkyl" refers to a substituted or unsubstituted or branched C3-C6 monocyclic or bicyclic 3- to 10-membered saturated alicyclic radical. 20 Refers to cycloalkyl. C3~C 20Cycloalkyl is a monocyclic or bicyclic C3-C 20 In a preferred embodiment, the C3-C6 alkyl group is cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, bicyclo[2.2.1]heptyl, or bicyclo[3.1.1]heptyl. 20 The monocyclic and bicyclic cycloalkyls may be further branched with one or more equal or different alkyl groups as described herein above.

[0037] The term "aryl" refers to a monocyclic, bicyclic, or tricyclic hydrocarbon ring system, preferably having 6 to 20 carbon atoms, in which at least one carbon ring has a 4p+2 π electron system (where "p" is the number of aromatic rings). The aryl moieties may be unsubstituted, monosubstituted, or identically or differently polysubstituted. In preferred embodiments, they are phenyl, 1-naphthyl, 2-naphthyl, or anthracenyl.

[0038] The term "arylalkyl" refers to a monocyclic, bicyclic, or tricyclic hydrocarbon ring system, preferably having 6 to 20 carbon atoms, in which at least one carbon ring has a 4p+2π electron system (where "p" is the number of aromatic rings), and in which the aryl moieties are mono- or polysubstituted, either identically or differently.

[0039] An "oligomeric cyclic ether" is a molecule consisting of a small number of repeating ether units. In the context of the present invention, oligomeric cyclic ether specifically refers to cyclic ethers having "butyl" (-(CH2)4-) repeating units. These molecules can be named based on the number of butyl repeating units, such as OCE3, OCE4, and OCE5. The structures of OCE3, OCE4, and OCE5 are provided herein below. [Table 1]

[0040] In a preferred embodiment, the at least one polyether polyol is selected from polyethylene glycol, polypropylene glycol, polyisobutylene glycol, or mixtures thereof.

[0041] In a more preferred embodiment, the at least one polyether polyol is selected from polyethylene glycol, polypropylene glycol, or a mixture thereof.

[0042] In an even more preferred embodiment, the at least one polyether polyol is polyethylene glycol.

[0043] The polyether polyols according to the present invention can be obtained preferably by known methods such as the addition reaction of alkylene oxides with glycols as initiator molecules.

[0044] In a preferred embodiment, the polyether polyol has an average functionality of 1.0 to 5.0 and an OH number of 10 mg KOH / g to 1000 mg KOH / g.

[0045] In a more preferred embodiment, the polyether polyol has an average functionality of 1.0 to 4.0 and an OH number of 10 mg KOH / g to 500 mg KOH / g.

[0046] In even more preferred embodiments, the nominal functionality of the first polyether polyol is 1.0 to 5.0, or 1.0 to 4.7, or 1.5 to 4.5, or 1.6 to 4.2, or 1.6 to 4.1, and more preferably 1.7 to 4.5, or 1.7 to 4.5, or 1.8 to 4.5, or 1.9 to 4.5, or 2.0 to 4.5.

[0047] In an even more preferred embodiment, the OH number of the polyether polyol is 50 mg KOH / g to 500 mg KOH / g. More preferably, it is 50 mg KOH / g to 480 mg KOH / g, or 50 mg KOH / g to 470 mg KOH / g, or 60 mg KOH / g to 470 mg KOH / g, or 60 mg KOH / g to 460 mg KOH / g, or 65 mg KOH / g to 460 mg KOH / g. More preferably, it is 65 mg KOH / g to 450 mg KOH / g, or 70 mg KOH / g to 450 mg KOH / g. In this context, according to the present invention, the OH number is determined in accordance with DIN 53240, and the functionality of the applied polyol is understood to be the theoretical functionality. In the case of polyether polyols, this theoretical functionality can be obtained, for example, by calculating the functionality based on the functionality of the starter molecules. The effects of side reactions during the preparation of the polyether polyol, such as disproportionation, are not taken into account when determining functionality.

[0048] The polyisocyanate can be an aromatic polyisocyanate, an aliphatic polyisocyanate, or a mixture thereof.

[0049] In the context of the present invention, aromatic polyisocyanates refer to aryl polyisocyanates or linear or branched, substituted or unsubstituted aryl alkyl polyisocyanates, while aliphatic polyisocyanates refer to linear or branched, substituted or unsubstituted alkyl polyisocyanates or linear or branched, substituted or unsubstituted cycloalkyl polyisocyanates.

[0050] In a preferred embodiment, the at least one polyisocyanate is selected from the group consisting of hexamethylene-1,6-diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 2,2-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, triphenylmethane-4,4',4"-triisocyanate, naphthylene-1,5-diisocyanate, polyphenylpolymethylene polyisocyanate, 1,2-xylylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, The isocyanate may be selected from m-tetramethylxylylene diisocyanate (TMXDI), tetramethylene 1,4-diisocyanate, pentamethylene 1,5-diisocyanate, hexamethylene 1,6-diisocyanate, decamethylene diisocyanate, 1,12-dodecane diisocyanate, 2-methyl-1,5-pentamethylene diisocyanate, cyclobutane-1,3-diisocyanate, 1,2-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 2,4-methylcyclohexane diisocyanate, 2,6-methylcyclohexane diisocyanate, 2,4'-dicyclohexyl diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, isophorone diisocyanate, or mixtures thereof.

[0051] In the context of the present invention, the term "at least one polyisocyanate" refers to either a monomeric polyisocyanate, a polymeric polyisocyanate, or a mixture thereof.

[0052] The alkyl polyisocyanate is selected from hexamethylene-1,6-diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, tetramethylene 1,4-diisocyanate, pentamethylene 1,5-diisocyanate, decamethylene diisocyanate, 1,12-dodecane diisocyanate, and 2-methyl-1,5-pentamethylene diisocyanate or mixtures thereof.

[0053] The cycloalkyl polyisocyanate is selected from 4,4'-dicyclohexylmethane diisocyanate, cyclobutane-1,3-diisocyanate, 1,2-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 2,4-methylcyclohexane diisocyanate, 2,6-methylcyclohexane diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, 2,4'-dicyclohexyl diisocyanate, or bis(isocyanatomethyl)-cyclohexane diisocyanate, or mixtures thereof.

[0054] The arylalkyl polyisocyanate is selected from 2,2-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, triphenylmethane-4,4',4"-triisocyanate, 1,2-xylylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, m-tetramethylxylylene diisocyanate (TMXDI), or mixtures thereof.

[0055] The aryl polyisocyanate is selected from 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, naphthylene-1,5-diisocyanate, polyphenylpolymethylene polyisocyanate, or mixtures thereof.

[0056] In an even more preferred embodiment, the at least one polyisocyanate is selected from methylene diphenyl diisocyanate, polymeric methylene diphenyl diisocyanate, or mixtures thereof.

[0057] Commercially, methylene diphenyl diisocyanate is available as a mixture of three different isomers: 2,2'-methylene diphenyl diisocyanate (2,2'-MDI), 2,4'-methylene diphenyl diisocyanate (2,4'-MDI), and 4,4'-methylene diphenyl diisocyanate (4,4'-MDI).

[0058] In a preferred embodiment, the isomer ratios and amounts of oligomeric species vary widely in commercially available products. Preferably, polymeric methylene diphenyl diisocyanate typically contains 30.0% to 80.0% by weight of monomeric methylene diphenyl diisocyanate isomers, with the remainder being the oligomeric species. Preferably, the methylene diphenyl diisocyanate isomers are a mixture of 4,4'-methylene diphenyl diisocyanate, 2,4'-methylene diphenyl diisocyanate, and very low levels of 2,2'-methylene diphenyl diisocyanate.

[0059] In a preferred embodiment, the at least one polyisocyanate has an NCO content in the range of 2.0% to 33.5% by weight, based on the total weight of the polyisocyanate.

[0060] In a preferred embodiment, at least one polyisocyanate has an isocyanate functionality of 2.0 or greater. Preferably, the isocyanate component has an isocyanate functionality in the range of 2.0 to 4.0. More preferably, the isocyanate component has an isocyanate functionality in the range of 2.0 to 3.5. Even more preferably, the isocyanate component has an isocyanate functionality in the range of 2.0 to 3.0.

[0061] In a preferred embodiment, the at least one diol of general formula (C) is selected from ethylene glycol, diethylene glycol, propane-1,3-diol, butane-1,4-diol, hexane-1,6-diol, cyclohexane-1,4-dimethanol or mixtures thereof.

[0062] In a more preferred embodiment, the at least one diol of general formula (C) is butane-1,4-diol.

[0063] In a preferred embodiment, the amount of the at least one diol is from 5.0% to 15.0% by weight, more preferably from 7.0% to 14.0% by weight, and even more preferably from 8.0% to 13.0% by weight, based on the total weight of the polyurethane.

[0064] In a preferred embodiment, the thermoplastic polyurethane coating composition has the general formula R 4 -OH (In the formula, R 4 C6~C 20 Alkyl groups, more preferably C6 to C 18 , and even more preferably C8 to C 18 The composition further comprises at least one hydrophobizing agent selected from

[0065] Hydrophobizing agents are known to modify surfaces to make them less wettable or water repellent.

[0066] In a preferred embodiment, the at least one hydrophobizing agent is selected from 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 1-nonadecanol, or 1-eicosanol.

[0067] In a more preferred embodiment, at least one hydrophobizing agent is 1-octanol.

[0068] In a more preferred embodiment, the at least one hydrophobizing agent is 1-octadecanol.

[0069] In a preferred embodiment, the at least one hydrophobizing agent is present in the thermoplastic polyurethane composition in an amount of 0.05 wt. % to 2.5 wt. %, more preferably 0.5 wt. % to 2.5 wt. %, and even more preferably 1.0 wt. % to 2.5 wt. %, based on the total weight of the polyurethane coating composition.

[0070] In a preferred embodiment, the at least one wax is selected from Montan acid esters, ethylene bisstearamide, fatty acid esters, fatty acid amides or mixtures thereof.

[0071] In a more preferred embodiment, at least one wax is a Montan acid ester.

[0072] In a preferred embodiment, the at least one wax is present in the thermoplastic polyurethane composition in an amount of 0.1 wt % to 5 wt %, more preferably 0.5 wt % to 2.5 wt %, and even more preferably 0.5 wt % to 1.5 wt %, based on the total weight of the polyurethane coating composition.

[0073] Thermoplastic polyurethane coating composition The thermoplastic polyurethane coating compositions of the present invention have acceptable properties, particularly tensile strength, melt flow rate, Shore hardness, and elongation at break. Optimizing the properties of the thermoplastic polyurethane coating compositions employed in the methods of the present invention to coat the interior surfaces of substrates allows for the design of coating systems to meet critical requirements as needed.

[0074] In a preferred embodiment, the Shore A hardness of the at least one thermoplastic polyurethane coating composition, determined according to DIN ISO 7619, is in the range of 75.0 to 100.0, more preferably 85.0 to 95.0.

[0075] In a preferred embodiment, the elongation at break of the at least one thermoplastic polyurethane coating composition ranges from 500 to 800, more preferably from 500 to 680, as determined according to ASTM D412 or DIN 53504-S2.

[0076] In a preferred embodiment, the tensile strength of the at least one thermoplastic polyurethane coating composition is in the range of 30.0 to 60.0 MPa, more preferably 30.0 to 40.0 MPa, as determined according to ASTM D412 or DIN 53504-S2.

[0077] In a preferred embodiment, the melt flow resistance of the at least one thermoplastic polyurethane coating composition is in the range of 50.0 to 100.0 g / 10 min, more preferably 60.0 to 80.0 g / 10 min, as determined according to ASTM D1238 or DIN EN ISO1133.

[0078] In a preferred embodiment, the at least one thermoplastic polyurethane coating composition has an abrasion index of 5.0 to 60.0 mm, determined according to DIN ISO 4649. 3 , more preferably 20.0 to 40.0 mm 3 The range is.

[0079] In a preferred embodiment, at least one thermoplastic polyurethane coating composition passes migration test method BS EN12873-2:2005 for cyclic oligomeric ether content.

[0080] In a preferred embodiment, at least one thermoplastic polyurethane coating composition passes the migration test for 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD) content according to method BS EN12873-2:2005.

[0081] In a preferred embodiment, at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro).

[0082] In a preferred embodiment, the substrate is a hollow substrate.

[0083] A hollow substrate is a shaped article that is hollow inside. Such substrates are characterized by having at least an inner surface and an outer surface. These substrates can be used to store or transport gases, liquids, or solid materials. The inner surface of such substrates tends to be in direct contact with the filled gas, liquid, or solid material when used for transport or storage.

[0084] In a preferred embodiment, the substrate is selected from a pipeline, a vessel, a containment vessel or a tank.

[0085] In an even more preferred embodiment, the substrate is a pipeline for transporting drinking water.

[0086] The coating thickness of the at least one thermoplastic polyurethane coating composition coated on the inner surface of the pipeline for transporting drinking water is in the range of 0.1 to 10.0 mm.

[0087] In another preferred embodiment, the substrate is a container having an interior surface coated with a thermoplastic polyurethane coating composition, at least one coated interior surface being in direct contact with water.

[0088] additives The thermoplastic polyurethane coating composition used in the method of the present invention further comprises at least one additive selected from a blowing agent, a dye, a pigment, a stabilizer, a plasticizer, an antistatic agent, a fungistatic agent, a bacteriostatic agent, a curing agent, or an antioxidant. The additives used herein are known and used in polyurethane compositions.

[0089] Coated substrate Another aspect of the present invention is a coated substrate having an interior surface coated with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, wherein the polyurethane comprises: a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C6-C 20 Aryl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 Cycloalkyl groups, substituted or unsubstituted C6-C 20 aryl groups, and p is an integer selected from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, with respect to the coated substrate.

[0090] In a preferred embodiment, the present invention provides a coated substrate having an interior surface coated with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, wherein the polyurethane comprises: c) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 alkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; d) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a substituted or unsubstituted C7-C 20 is an arylalkyl group, and p is an integer selected from 2 to 4, and b) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, with respect to the coated substrate.

[0091] In a more preferred embodiment, the present invention provides a coated substrate having an interior surface coated with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, wherein the polyurethane comprises: e) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is selected from linear or branched, substituted or unsubstituted C2-C6 alkyl groups; m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; f) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a substituted or unsubstituted C 10 ~C 15 is an arylalkyl group, and p is an integer selected from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, with respect to the coated substrate.

[0092] In a preferred embodiment, the at least one polyether polyol is selected from polyethylene glycol, polypropylene glycol, polyisobutylene glycol, or mixtures thereof.

[0093] In a preferred embodiment, the at least one polyisocyanate is selected from the group consisting of hexamethylene-1,6-diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 2,2-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, triphenylmethane-4,4',4"-triisocyanate, naphthylene-1,5-diisocyanate, polyphenylpolymethylene polyisocyanate, 1,2-xylylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, The isocyanate may be selected from m-tetramethylxylylene diisocyanate (TMXDI), tetramethylene 1,4-diisocyanate, pentamethylene 1,5-diisocyanate, hexamethylene 1,6-diisocyanate, decamethylene diisocyanate, 1,12-dodecane diisocyanate, 2-methyl-1,5-pentamethylene diisocyanate, cyclobutane-1,3-diisocyanate, 1,2-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 2,4-methylcyclohexane diisocyanate, 2,6-methylcyclohexane diisocyanate, 2,4'-dicyclohexyl diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, isophorone diisocyanate, or mixtures thereof.

[0094] In a preferred embodiment, the at least one polyisocyanate has an NCO content in the range of 2.0% to 33.5% by weight, based on the total weight of the polyisocyanate.

[0095] In a preferred embodiment, the at least one diol of general formula (C) is selected from ethylene glycol, propane-1,3-diol, butane-1,4-diol, hexane-1,6-diol, cyclohexane-1,4-dimethanol or mixtures thereof.

[0096] In a preferred embodiment, the amount of the at least one diol is 5.0% to 10.0% by weight, more preferably 7.0% to 14.0% by weight, and even more preferably 8.0% to 13.0% by weight, based on the total weight of the polyurethane.

[0097] In a preferred embodiment, the coating composition comprises a compound of formula R 4 -OH(in the formula, R 4 C6~C 20 Alkyl groups, more preferably C6 to C 18 , and even more preferably C8 to C 18 The composition further comprises at least one hydrophobizing agent selected from

[0098] In a preferred embodiment, the at least one hydrophobizing agent is selected from 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 1-nonadecanol, or 1-eicosanol. In a more preferred embodiment, the at least one hydrophobizing agent is 1-octadecanol.

[0099] In a preferred embodiment, the at least one hydrophobizing agent is present in the thermoplastic polyurethane composition in an amount of 0.05 wt. % to 2.5 wt. %, more preferably 0.5 wt. % to 2.5 wt. %, and even more preferably 1.0 wt. % to 2.5 wt. %, based on the total weight of the polyurethane coating composition.

[0100] In a preferred embodiment, the at least one wax is selected from Montan acid esters, ethylene bisstearamide, fatty acid esters, fatty acid amides or mixtures thereof.

[0101] In a preferred embodiment, the Shore A hardness of the at least one thermoplastic polyurethane coating composition according to DIN ISO 7619 ranges from 75.0 to 100.0, more preferably from 85.0 to 95.0.

[0102] In a preferred embodiment, the elongation at break of the at least one thermoplastic polyurethane coating composition ranges from 500 to 800, more preferably from 500 to 680, as determined according to ASTM D412 or DIN 53504-S2.

[0103] In a preferred embodiment, the tensile strength of the at least one thermoplastic polyurethane coating composition is in the range of 30.0 to 60.0 MPa, more preferably 30.0 to 40.0 MPa according to ASTM D412 or DIN 53504-S2.

[0104] In a preferred embodiment, the melt flow resistance of the at least one thermoplastic polyurethane coating composition is in the range of 50.0 to 100.0 g / 10 min, more preferably 60.0 to 80.0 g / 10 min, as determined according to ASTM D1238 or DIN EN ISO1133.

[0105] In a preferred embodiment, the at least one thermoplastic polyurethane coating composition has an abrasion index of 5.0 to 60.0 mm, determined according to DIN ISO 4649. 3 , more preferably 20.0 to 40.0 mm 3 The range is.

[0106] In a preferred embodiment, at least one thermoplastic polyurethane coating composition passes migration test method BS EN12873-2:2005 for cyclic oligomeric ether content.

[0107] In a preferred embodiment, at least one thermoplastic polyurethane coating composition passes the migration test for 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD) content according to method BS EN12873-2:2005.

[0108] In a preferred embodiment, at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro).

[0109] In a preferred embodiment, the substrate is a hollow substrate.

[0110] In a preferred embodiment, the substrate is selected from a pipeline, a vessel, a containment vessel or a tank.

[0111] In a preferred embodiment, the substrate is a pipeline for transporting drinking water.

[0112] In a preferred embodiment, the coating thickness of the at least one thermoplastic polyurethane coating composition coated on the inner surface of a pipeline for the transportation of drinking water is in the range of 0.1 to 10.0 mm.

[0113] In a preferred embodiment, the substrate is a container having an interior surface coated with a thermoplastic polyurethane coating composition, at least one coated interior surface being in direct contact with water.

[0114] In yet another aspect of the present invention, there is provided the use of at least one thermoplastic polyurethane coating composition for coating an interior surface of a substrate, the thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, the polyurethane comprising: a) at least one polyether polyol of general formula A H(OR1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 Cycloalkyl groups, substituted or unsubstituted C6-C 20 aryl groups, and p is an integer selected from 2 to 4; c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, use is provided.

[0115] In yet another aspect of the present invention, there is provided a thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, said polyurethane comprising: a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C6-C 20 Aryl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C6-C 20 Aryl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 Cycloalkyl groups, substituted or unsubstituted C6-C 20 aryl groups, and p is an integer selected from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3is a linear or branched, substituted or unsubstituted C2-C 20 alkyl groups) and wherein R 1 is not -(CH2)4-, The coating composition has a Shore A hardness in the range of 75.0 to 100.0 according to DIN ISO 7619, an elongation at break in the range of 500 to 800 according to DIN ISO 7619, a tensile strength in the range of 30.0 to 60.0 MPa according to ASTM D 412 or DIN 53504-S2, a melt flow resistance in the range of 50.0 to 100.0 g / 10 min according to ASTM D 1238 or DIN EN ISO 1133, and a melt flow resistance of 5.0 mm according to DIN ISO 4649. 3 ~60.0mm 3 A thermoplastic polyurethane coating composition is provided which is characterized by an abrasion index in the range of

[0116] In yet another aspect of the present invention, there is provided a method of forming a thermoplastic polyurethane coating composition, comprising: i) mixing at least one polyol, at least one chain extender, and optionally at least one catalyst; ii) adding the mixture obtained in step (i) to at least one polyisocyanate and heating the resulting mixture at a temperature in the range of 30 to 120°C to obtain a polyurethane; A method is provided, comprising:

[0117] The method of the present invention provides a coated substrate that keeps track of the amount of leachate leached from the coating composition, particularly the amount of leachate leached from the thermoplastic polyurethane coating composition of the present invention, within acceptable limits.

[0118] Additionally, the thermoplastic polyurethane coating compositions of the present invention have acceptable properties, particularly tensile strength, elongation at break, melt flow rate, Shore hardness and elongation at break.

[0119] The present invention provides one or more of the following advantages: 1. The amount of leachate leached from the coated substrate is within acceptable levels, more specifically, below the acceptable limit of less than 100.0 μg / L. 2. The amount of 2,4,7,9-tetramethyldec-5-yne-4,7-diol (TMDD) leaching into water upon contact with the coated surface of the substrate is well within the acceptable limit of 20.0 μg / L. 3. The amount of 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione leached into water upon contact with the coated surface of a substrate is well within acceptable limits.

[0120] Embodiments: Below, a list of embodiments is provided to further illustrate the present disclosure, but is not intended to limit the disclosure to the specific embodiments listed below. 1. A method for coating an interior surface of a substrate with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, said polyurethane comprising: a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, m is an integer from 2 to 8, and n is an integer from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted C7 to C20 aryl alkyl groups, linear or branched, substituted or unsubstituted C2 to C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, and p is an integer from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, how. 2. The method of embodiment 1, wherein the at least one polyether polyol is selected from polyethylene glycol, polypropylene glycol, polyisobutylene glycol, or mixtures thereof. 3. The at least one polyisocyanate is selected from the group consisting of hexamethylene-1,6-diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 2,2-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, and 1,2-phenylene diisocyanate. , 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, triphenylmethane-4,4',4"-triisocyanate, naphthylene-1,5-diisocyanate, polyphenylpolymethylene polyisocyanate, 1,2-xylylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, m-tetramethylxylylene diisocyanate (TMXDI), tetramethyl xylylene diisocyanate 3. The method of any one of embodiments 1 or 2, wherein the diisocyanate is selected from tramethylene 1,4-diisocyanate, pentamethylene 1,5-diisocyanate, hexamethylene 1,6-diisocyanate, decamethylene diisocyanate, 1,12-dodecane diisocyanate, 2-methyl-1,5-pentamethylene diisocyanate, cyclobutane-1,3-diisocyanate, 1,2-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 2,4-methylcyclohexane diisocyanate, 2,6-methylcyclohexane diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, 2,4'-dicyclohexyl diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, isophorone diisocyanate, or a mixture thereof. 4. The method of any one of the preceding claims, wherein the at least one polyisocyanate has an NCO content in the range of 2.0% to 33.5% by weight, based on the total weight of the polyisocyanate. 5. The method of any of the preceding embodiments, wherein the at least one diol of general formula (C) is selected from ethylene glycol, propane-1,3-diol, butane-1,4-diol, hexane-1,6-diol, cyclohexane-1,4-dimethanol, or mixtures thereof. 6. The method of any one of the preceding embodiments, wherein the amount of the at least one diol is 5% to 10% by weight, based on the total weight of the polyurethane. 7. The coating composition comprises a compound represented by the general formula R 4 -OH(in the formula, R 4 is C6~C 20 7. The method of any of the preceding claims, further comprising at least one hydrophobizing agent selected from alkyl groups. 8. The method of embodiment 7, wherein the at least one hydrophobizing agent is selected from 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 1-nonadecanol, or 1-eicosanol. 9. The method of any one of embodiments 7 or 8, wherein the amount of the at least one hydrophobizing agent is 0.05% to 2.5% by weight, based on the total weight of the polyurethane. 10. The method of any one of the preceding claims, wherein the at least one wax is selected from Montan acid esters, ethylene bisstearamides, fatty acid esters, fatty acid amides, or mixtures thereof. 11. The method of any one of the preceding claims, wherein the Shore A hardness of the at least one thermoplastic polyurethane coating composition is in the range of 75.0 to 100.0 according to DIN ISO 7619. 12. The method of any one of the preceding claims, wherein the at least one thermoplastic polyurethane coating composition has an elongation at break in the range of 500 to 800, as determined according to ASTM D412 or DIN 53504-S2. 13. The method of any one of claims 1 to 12, wherein the tensile strength of the at least one thermoplastic polyurethane coating composition is in the range of 30.0 to 60.0 MPa according to ASTM D412 or DIN 53504-S2. 14. The method of any one of the preceding claims, wherein the melt flow resistance of the at least one thermoplastic polyurethane coating composition is in the range of 50.0 to 100.0 g / 10 min, as determined according to ASTM D1238 or DIN EN ISO1133. 15. The at least one thermoplastic polyurethane coating composition has an abrasion index of 5.0 to 60.0 mm, determined according to DIN ISO 4649. 3 15. The method of any preceding embodiment, wherein the range is: 16. The method of any one of claims 1 to 15, wherein the at least one thermoplastic polyurethane coating composition passes migration test method BS EN12873-2:2005 for cyclic oligomeric ether content. 17. The method of any one of claims 1 to 16, wherein the at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD). 18. The method of any one of claims 1 to 17, wherein the at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro). 19. The method of any preceding embodiment, wherein the substrate is a hollow substrate. 20. The method of any one of the preceding claims, wherein the substrate is selected from a pipeline, a vessel, a containment vessel, or a tank. 21. The method of any preceding embodiment, wherein the substrate is a pipeline for transporting drinking water. 22. The method of embodiment 23, wherein the coating thickness of the at least one thermoplastic polyurethane coating composition coated on the inner surface of the pipeline for transporting drinking water is in the range of 0.1 to 10.0 mm. 23. The method of any one of claims 1 to 22, wherein the substrate is a container having an interior surface coated with a thermoplastic polyurethane coating composition, and at least one coated interior surface is in direct contact with water. 24. A coated substrate having an interior surface coated with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, wherein the polyurethane is a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20Cycloalkyl groups, substituted or unsubstituted C6-C 20 aryl groups, and p is an integer selected from 2 to 4; c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, coated substrate. 25. The coated substrate of embodiment 24, wherein the at least one polyether polyol is selected from polyethylene glycol, polypropylene glycol, polyisobutylene glycol, or a mixture thereof. 26. The at least one polyisocyanate is selected from the group consisting of hexamethylene-1,6-diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 2,2-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,2-phenylene diisocyanate, 1,3-Phenylene diisocyanate, 1,4-Phenylene diisocyanate, Triphenylmethane-4,4',4"-triisocyanate, Naphthylene-1,5-diisocyanate, Polyphenylpolymethylene polyisocyanate, 1,2-Xylylene diisocyanate, 1,3-Xylylene diisocyanate, 1,4-Xylylene diisocyanate, m-Tetramethylxylylene diisocyanate (TMXDI), Tetra 26. The coated substrate of embodiment 24 or 25, wherein the diisocyanate is selected from methylene 1,4-diisocyanate, pentamethylene 1,5-diisocyanate, hexamethylene 1,6-diisocyanate, decamethylene diisocyanate, 1,12-dodecane diisocyanate, 2-methyl-1,5-pentamethylene diisocyanate, cyclobutane-1,3-diisocyanate, 1,2-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 2,4-methylcyclohexane diisocyanate, 2,6-methylcyclohexane diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, 2,4'-dicyclohexyl diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, isophorone diisocyanate, or a mixture thereof. 27. The coated substrate of any one of embodiments 24 to 26, wherein the at least one polyisocyanate has an NCO content in the range of 2.0% to 33.5% by weight, based on the total weight of the polyisocyanate. 28. The coated substrate of any of embodiments 24 to 27, wherein the at least one diol of general formula (C) is selected from ethylene glycol, propane-1,3-diol, butane-1,4-diol, hexane-1,6-diol, cyclohexane-1,4-dimethanol, or mixtures thereof. 29. The coated substrate of any one of embodiments 24 to 28, wherein the amount of diol is 5.0% to 10.0% by weight, based on the total weight of the polyurethane. 30. The coating composition comprises a compound of the general formula R 4 -OH(in the formula, R 4 is C6~C 20 30. The coated substrate of any of embodiments 24 to 29, further comprising at least one hydrophobizing agent selected from alkyl groups. 31. The coated substrate of embodiment 30, wherein the at least one hydrophobizing agent is selected from 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 1-nonadecanol, or 1-eicosanol. 32. The coated substrate of embodiment 30 or 31, wherein the amount of the at least one hydrophobizing agent is 0.05% to 2.5% by weight, based on the total weight of the polyurethane. 33. The coated substrate of any of embodiments 24 to 32, wherein the at least one wax is selected from Montan acid esters, ethylene bisstearamide, fatty acid esters, fatty acid amides, or mixtures thereof. 34. The coated substrate of any one of embodiments 24 to 33, wherein the Shore A hardness of the at least one thermoplastic polyurethane coating composition is in the range of 75.0 to 100.0 according to DIN ISO 7619. 35. The coated substrate of any one of embodiments 24 to 34, wherein the at least one thermoplastic polyurethane coating composition has an elongation at break in the range of 500 to 800, as determined according to ASTM D412 or DIN 53504-S2. 36. The coated substrate of any one of embodiments 24 to 35, wherein the at least one thermoplastic polyurethane coating composition has a tensile strength in the range of 30.0 to 60.0 MPa according to ASTM D412 or DIN 53504-S2. 37. The coated substrate of any one of embodiments 24 to 36, wherein the melt flow resistance of the at least one thermoplastic polyurethane coating composition is in the range of 50.0 to 100.0 g / 10 min, as determined according to ASTM D1238 or DIN EN ISO1133. 38. The abrasion index of the at least one thermoplastic polyurethane coating composition is 5.0 to 60.0 mm, determined according to DIN ISO 4649. 3 38. The coated substrate of any of embodiments 24 to 37, wherein the surface area of ​​the coated substrate is in the range of 39. The coated substrate of any of embodiments 24 to 38, wherein the at least one thermoplastic polyurethane coating composition passes the migration test for cyclic oligomeric ether content according to method BS EN12873-2:2005. 40. The coated substrate of any of embodiments 24 to 39, wherein the at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD). 41. The coated substrate of any of embodiments 24 to 40, wherein the at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro). 42. The coated substrate of any one of embodiments 26 to 45, wherein the substrate is a hollow substrate. 43. The coated substrate of any of embodiments 24 to 42, wherein the substrate is selected from a pipeline, a vessel, a containment vessel, or a tank. 44. The coated substrate of any of embodiments 24 to 42, wherein the hollow substrate is a pipeline for transporting drinking water. 45. The coated substrate of embodiment 44, wherein the coating thickness of the at least one thermoplastic polyurethane coating composition coated on the inner surface of a pipeline for transporting drinking water is in the range of 0.1 to 10.0 mm. 46. ​​Use of at least one thermoplastic polyurethane coating composition for coating an inner surface of a substrate, said thermoplastic polyurethane coating composition comprising: a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 Cycloalkyl groups, substituted or unsubstituted C6-C 20 aryl groups, and p is an integer selected from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, use. 47. A thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, wherein the polyurethane is a) at least one polyether polyol of general formula A H(OR 1 ) m (OH) n (A) (In the formula, R 1 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 cycloalkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; b) at least one polyisocyanate of general formula B R 2 (NCO) p (B) (In the formula, R 2 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, linear or branched, substituted or unsubstituted, C7-C 20 Aryl alkyl groups, linear or branched, substituted or unsubstituted, C2-C 20 Alkylene groups, linear or branched, substituted or unsubstituted, C3-C 20 Cycloalkyl groups, substituted or unsubstituted C6-C 20 aryl groups, and p is an integer selected from 2 to 4, and c) at least one diol of general formula C R 3 (OH)2(C) (In the formula, R 3 is a linear or branched, substituted or unsubstituted C2-C 20 Alkyl groups, substituted or unsubstituted, C3-C 20 cycloalkyl groups) and wherein R 1 is not -(CH2)4-, The coating composition has a Shore A hardness in the range of 75.0 to 100.0 according to DIN ISO 7619, an elongation at break in the range of 500 to 800 according to DIN ISO 7619, a tensile strength in the range of 30.0 to 60.0 MPa according to ASTM D 412 or DIN 53504-S2, a melt flow resistance in the range of 50 to 90 g / 10 min according to ASTM D 1238 or DIN EN ISO 1133, and a melt flow resistance in the range of 5.0 to 60.0 mm according to DIN ISO 4649. 3 1. A thermoplastic polyurethane coating composition characterized by an abrasion index in the range of 48. A method of forming a thermoplastic polyurethane coating composition, comprising: ii) mixing at least one polyol, at least one chain extender, and optionally at least one catalyst; iii) adding the mixture obtained in step (i) to at least one polyisocyanate and heating the resulting mixture at a temperature in the range of 30 to 120°C to obtain a polyurethane; A method comprising: [Example]

[0121] The present invention is further illustrated by the following non-limiting examples. More specifically, the test methods identified below are part of the general disclosure of this application and are not limited to the specific examples. [Table 2] [Table 3]

[0122] Example 1: Preparation of a thermoplastic polyurethane coating composition (IE1) Polyglycol was mixed with 1,4-butanediol, monoethanolamine, and wax to obtain a mixture. The mixture was added to MDI and heated at temperatures ranging from 30 to 120°C to obtain polyurethane. The polyurethane was extruded to obtain beads, designated IE1.

[0123] Example 2: Preparation of a thermoplastic polyurethane coating composition (IE2) Polyglycol was mixed with 1,4-butanediol and wax to obtain a mixture. The mixture was then added to MDI and heated at temperatures ranging from 30 to 120°C to obtain polyurethane. The polyurethane was then extruded to obtain beads, designated IE2.

[0124] The mechanical properties of the thermoplastic polyurethane coating compositions (IE1 and IE2) were determined and are reported in Table 1 below. [Table 4]

[0125] As can be seen from Table 1, the coating composition of the present invention has acceptable properties, particularly tensile strength and elongation at break, compared to the comparative sample based on commercially available TPU3. Furthermore, the thermoplastic polyurethane coating composition of the present invention has improved melt flow rate, Shore hardness, and elongation at break. The results demonstrate that the thermoplastic polyurethane coating composition of the present invention meets the requirements for its use as a pipe liner.

[0126] Migration Test The migration tests were conducted according to the test conditions set forth in BS EN12873-2:2005. Migration tests in both non-chlorinated and chlorinated water were investigated by exposing surfaces coated with the thermoplastic polyurethane coating composition to chlorinated or non-chlorinated water. The migration tests were conducted over three consecutive 72-hour migration periods (T1, T2, T3). Each migration period represented 72 hours. After 72 hours, the migration water was decanted (T1) and replaced with fresh test water.

[0127] The migration extracts were analyzed directly by liquid chromatography-mass spectrometry (LC-MS-MS) with positive electrospray ionization using multiple reaction monitoring. The following leachates were investigated in this study: oligomeric cyclic ethers and 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD). [Table 5]

[0128] A summary of the leachate migration results for IE1, as well as comparative compositions, alternative commercial liners, and TPU1, is provided below in Tables 2-4. [Table 6] [Table 7] [Table 8]

[0129] As can be seen from Tables 2-4, the amount of leachate transferred into water after contact with the thermoplastic polyurethane coating composition of Example IE1 is substantially less than the comparative composition.

[0130] Specifically, it is noteworthy that the amount of leachate from the coating compositions of Examples IE1 and IE2 is within acceptable levels. More specifically, the acceptable limit for oligomeric cyclic ethers in drinking water is less than 100 μg / L. The amount of oligomeric cyclic ethers in IE1 does not exceed 21.73 μg / L. Similarly, the leaching of 2,4,7,9-tetramethyldec-5-yne-4,7-diol (TMDD) and oxaspiro into drinking water when contacted with the thermoplastic polyurethane coating composition of the present invention is well within acceptable limits.

Claims

1. 1. A method for coating an interior surface of a substrate with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, said polyurethane comprising: a) at least one polyether polyol of general formula A H(OR １ ) ｍ (OH) ｎ (A) (In the formula, R １ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ alkyl group, substituted or unsubstituted C ６ ~C ２０ Aryl groups, linear or branched, substituted or unsubstituted C ７ ~C ２０ Aryl alkyl groups, linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkylene group, linear or branched, substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups, m is an integer from 2 to 8, and n is an integer from 2 to 5), b) at least one polyisocyanate of general formula B R ２ (NCO) ｐ (B) (In the formula, R ２ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ alkyl group, substituted or unsubstituted C ６ ~C ２０ Aryl groups, linear or branched, substituted or unsubstituted C ７ ~C ２０ Aryl alkyl groups, linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkylene group, linear or branched, substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups, and p is an integer from 2 to 4, and c) at least one diol of general formula C R ３ (OH) ２ (C) (In the formula, R ３ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ alkyl group, substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups) and wherein R １ Ha-(CH ２ ) ４ -Not a method.

2. 10. The method of claim 1, wherein the at least one polyether polyol is selected from polyethylene glycol, polypropylene glycol, polyisobutylene glycol, or mixtures thereof.

3. The at least one polyisocyanate may be selected from the group consisting of hexamethylene-1,6-diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 2,2-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, triphenylmethane-4,4',4"-triisocyanate, naphthylene-1,5-diisocyanate, polyphenylpolymethylene polyisocyanate, 1,2-xylylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, m-tetramethylxylylene 3. The method of claim 1, wherein the diisocyanate is selected from the group consisting of tetramethylene 1,4-diisocyanate, pentamethylene 1,5-diisocyanate, hexamethylene 1,6-diisocyanate, decamethylene diisocyanate, 1,12-dodecane diisocyanate, 2-methyl-1,5-pentamethylene diisocyanate, cyclobutane-1,3-diisocyanate, 1,2-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 2,4-methylcyclohexane diisocyanate, 2,6-methylcyclohexane diisocyanate, 2,4'-dicyclohexyl diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, isophorone diisocyanate, and mixtures thereof.

4. 4. The method of claim 1, wherein the at least one polyisocyanate has an NCO content in the range of 2.0% to 33.5% by weight, based on the total weight of the polyisocyanate.

5. 5. The method according to any one of claims 1 to 4, wherein the at least one diol of general formula (C) is selected from ethylene glycol, propane-1,3-diol, butane-1,4-diol, hexane-1,6-diol, cyclohexane-1,4-dimethanol or mixtures thereof.

6. 6. The method of any one of claims 1 to 5, wherein the amount of the at least one diol is from 5.0 wt% to 10.0 wt%, based on the total weight of the polyurethane.

7. The coating composition has the formula R ４ -OH (wherein, R ４ is C ６ ~C ２０ 7. The method of claim 1, further comprising at least one hydrophobizing agent selected from alkyl groups.

8. 8. The method of claim 7, wherein the at least one hydrophobizing agent is selected from 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 1-nonadecanol, 1-eicosanol, or a combination thereof.

9. 9. The method according to claim 7, wherein the amount of said at least one hydrophobizing agent is from 0.05% to 2.5% by weight, based on the total weight of the polyurethane.

10. 10. The method of any one of claims 1 to 9, wherein the at least one wax is selected from Montan acid esters, ethylene bisstearamide, fatty acid esters, fatty acid amides, or mixtures thereof.

11. 11. The method according to any one of claims 1 to 10, wherein the Shore A hardness of the at least one thermoplastic polyurethane coating composition is in the range of 75.0 to 100.0 according to DIN ISO 7619.

12. 12. The method according to any one of claims 1 to 11, wherein the elongation at break of the at least one thermoplastic polyurethane coating composition is in the range of 500 to 800, determined according to ASTM D412 or DIN 53504-S2.

13. 13. The method of any one of claims 1 to 12, wherein the tensile strength of the at least one thermoplastic polyurethane coating composition is in the range of 30.0 to 60.0 MPa according to ASTM D412 or DIN 53504-S2.

14. 14. The method of any one of claims 1 to 13, wherein the melt flow resistance of the at least one thermoplastic polyurethane coating composition is in the range of 50.0 to 100.0 g / 10 min, determined according to ASTM D1238 or DIN EN ISO 1133.

15. The at least one thermoplastic polyurethane coating composition has an abrasion index of 5.0 to 60.0 mm, determined according to DIN ISO 4649. ３ 15. The method of claim 1, wherein the solubility of the solubility of the solubility of the

16. 16. The method of any one of claims 1 to 15, wherein the at least one thermoplastic polyurethane coating composition passes migration test method BS EN12873-2:2005 for cyclic oligomeric ether content.

17. 17. The method of any one of claims 1 to 16, wherein the at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD).

18. 18. The method of any one of claims 1 to 17, wherein the at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro).

19. 19. The method of any one of claims 1 to 18, wherein the substrate is a hollow substrate.

20. 20. The method of any one of claims 1 to 19, wherein the substrate is selected from a pipeline, a vessel, a containment vessel, or a tank.

21. 21. The method of any one of claims 1 to 20, wherein the substrate is a pipeline for transporting drinking water.

22. 22. The method of claim 21, wherein the coating thickness of the at least one thermoplastic polyurethane coating composition coated on the inner surface of the pipeline for transporting drinking water is in the range of 0.1 to 10.0 mm.

23. 23. The method of any one of claims 1 to 22, wherein the substrate is a container having an interior surface coated with the thermoplastic polyurethane coating composition, the coated interior surface being in direct contact with water.

24. 1. A coated substrate having an interior surface coated with at least one thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, wherein the polyurethane comprises: a) at least one polyether polyol of general formula A H(OR １ ) ｍ (OH) ｎ (A) (In the formula, R １ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ alkyl group, substituted or unsubstituted C ２ ~C ２０ Aryl groups, linear or branched, substituted or unsubstituted C ７ ~C ２０ Aryl alkyl groups, linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkylene groups, linear or branched, or substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; b) at least one polyisocyanate of general formula B R ２ (NCO) ｐ (B) (In the formula, R ２ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ alkyl group, substituted or unsubstituted C ２ ~C ２０ Aryl groups, linear or branched, substituted or unsubstituted C ７ ~C ２０ Aryl alkyl groups, linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkylene group, linear or branched, substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups, and p is an integer selected from 2 to 4, and c) at least one diol of general formula C R ３ (OH) ２ (C) (In the formula, R ３ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ alkyl group, substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups) and wherein R １ Ha-(CH ２ ) ４ - Not a coated substrate.

25. 25. The coated substrate of claim 24, wherein the at least one polyether polyol is selected from polyethylene glycol, polypropylene glycol, polyisobutylene glycol, or mixtures thereof.

26. The at least one polyisocyanate may be selected from the group consisting of hexamethylene-1,6-diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 2,2-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,2-phenylene diisocyanate, 1, 3-phenylene diisocyanate, 1,4-phenylene diisocyanate, triphenylmethane-4,4',4"-triisocyanate, naphthylene-1,5-diisocyanate, polyphenylpolymethylene polyisocyanate, 1,2-xylylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, m-tetramethylxylylene diisocyanate (TMXDI), tetramethyl xylylene diisocyanate 26. The coated substrate of claim 24 or 25, wherein the diisocyanate is selected from ethylene 1,4-diisocyanate, pentamethylene 1,5-diisocyanate, hexamethylene 1,6-diisocyanate, decamethylene diisocyanate, 1,12-dodecane diisocyanate, 2-methyl-1,5-pentamethylene diisocyanate, cyclobutane-1,3-diisocyanate, 1,2-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 2,4-methylcyclohexane diisocyanate, 2,6-methylcyclohexane diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, 2,4'-dicyclohexyl diisocyanate, bis(isocyanatomethyl)-cyclohexane diisocyanate, isophorone diisocyanate, or mixtures thereof.

27. 27. The coated substrate of any one of claims 24 to 26, wherein the at least one polyisocyanate has an NCO content in the range of 2.0 wt% to 33.5 wt%, based on the total weight of the polyisocyanate.

28. 28. The coated substrate of any one of claims 24 to 27, wherein the at least one diol of general formula (C) is selected from ethylene glycol, diethylene glycol, propane-1,3-diol, butane-1,4-diol, hexane-1,6-diol, cyclohexane-1,4-dimethanol or mixtures thereof.

29. 29. The coated substrate of any one of claims 24 to 28, wherein the amount of the diol is from 5.0 wt% to 10.0 wt%, based on the total weight of the polyurethane.

30. The coating composition has the general formula R ４ -OH (wherein, R ４ is C ６ ~C ２０ 30. The coated substrate of any one of claims 24 to 29, further comprising at least one hydrophobizing agent selected from alkyl groups.

31. 31. The coated substrate of claim 30, wherein the at least one hydrophobizing agent is selected from 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 1-nonadecanol, or 1-eicosanol.

32. 32. The coated substrate of claim 30 or 31, wherein the amount of the at least one hydrophobizing agent is from 0.05% to 2.5% by weight, based on the total weight of the polyurethane.

33. 33. The coated substrate of any one of claims 24 to 32, wherein the at least one wax is selected from Montan acid esters, ethylene bisstearamide, fatty acid esters, fatty acid amides, or mixtures thereof.

34. 34. The coated substrate according to any one of claims 24 to 33, wherein the Shore A hardness of the at least one thermoplastic polyurethane coating composition is in the range of 75.0 to 100.0 according to DIN ISO 7619.

35. 35. The coated substrate of any one of claims 24 to 34, wherein the at least one thermoplastic polyurethane coating composition has an elongation at break in the range of 500 to 800, determined according to ASTM D412 or DIN 53504-S2.

36. 36. The coated substrate of any one of claims 24 to 35, wherein the at least one thermoplastic polyurethane coating composition has a tensile strength in the range of 30.0 to 60.0 MPa according to ASTM D412 or DIN 53504-S2.

37. 37. The coated substrate of any one of claims 24 to 36, wherein the melt flow resistance of the at least one thermoplastic polyurethane coating composition is in the range of 50.0 to 100.0 g / 10 min, determined according to ASTM D1238 or DIN EN ISO 1133.

38. The at least one thermoplastic polyurethane coating composition has an abrasion index of 5.0 to 60.0 mm, determined according to DIN ISO 4649. ３ 38. The coated substrate of any one of claims 24 to 37, wherein the viscosity is in the range of

39. 39. The coated substrate of any one of claims 24 to 38, wherein the at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN 12873-2:2005 for cyclic oligomeric ether content.

40. 40. The coated substrate of any one of claims 24 to 39, wherein the at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD).

41. 41. The coated substrate of any one of claims 24 to 40, wherein the at least one thermoplastic polyurethane coating composition passes the migration test according to method BS EN12873-2:2005 for the content of 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (oxaspiro).

42. 46. ​​The coated substrate of any one of claims 26 to 45, wherein the substrate is a hollow substrate.

43. 43. The coated substrate of any one of claims 24 to 42, wherein the substrate is selected from a pipeline, a vessel, a containment vessel, or a tank.

44. 43. The coated substrate of any one of claims 24 to 42, wherein the hollow substrate is a pipeline for transporting drinking water.

45. 45. The coated substrate of claim 44, wherein the coating thickness of the at least one thermoplastic polyurethane coating composition coated on the inner surface of the pipeline for the transportation of drinking water ranges from 0.1 to 10.0 mm.

46. 1. Use of at least one thermoplastic polyurethane coating composition for coating an interior surface of a substrate, said thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, said polyurethane comprising: a) at least one polyether polyol of general formula A H(OR １ ) ｍ (OH) ｎ (A) (In the formula, R １ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkyl groups, linear or branched, substituted or unsubstituted C ７ ~C ２０ Aryl alkyl groups, linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkylene groups, linear or branched, or substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; b) at least one polyisocyanate of general formula B R ２ (NCO) ｐ (B) (In the formula, R ２ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkyl groups, linear or branched, substituted or unsubstituted C ７ ~C ２０ Aryl alkyl groups, linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkylene group, linear or branched, substituted or unsubstituted C ３ ~C ２０ Cycloalkyl groups, substituted or unsubstituted C ６ ~C ２０ aryl groups, and p is an integer selected from 2 to 4, and c) at least one diol of general formula C R ３ (OH) ２ (C) (In the formula, R ３ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ alkyl group, substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups) and wherein R １ Ha-(CH ２ ) ４ -Not used.

47. 1. A thermoplastic polyurethane coating composition comprising a polyurethane and at least one wax, said polyurethane comprising: a) at least one polyether polyol of general formula A H(OR １ ) ｍ (OH) ｎ (A) (In the formula, R １ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkyl groups, linear or branched, substituted or unsubstituted C ７ ~C ２０ Aryl alkyl groups, linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkylene groups, linear or branched, or substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups, m is an integer selected from 2 to 8, and n is an integer selected from 2 to 5; b) at least one polyisocyanate of general formula B R ２ (NCO) ｐ (B) (In the formula, R ２ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkyl groups, linear or branched, substituted or unsubstituted C ７ ~C ２０ Aryl alkyl groups, linear or branched, substituted or unsubstituted C ２ ~C ２０ Alkylene group, linear or branched, substituted or unsubstituted C ３ ~C ２０ Cycloalkyl groups, substituted or unsubstituted C ６ ~C ２０ aryl groups, and p is an integer selected from 2 to 4, and c) at least one diol of general formula C R ３ (OH) ２ (C) (In the formula, R ３ is a linear or branched, substituted or unsubstituted C ２ ~C ２０ alkyl group, substituted or unsubstituted C ３ ~C ２０ cycloalkyl groups) and wherein R １ Ha-(CH ２ ) ４ - but not, The coating composition has a Shore A hardness, determined according to DIN ISO 7619, ranging from 75.0 to 100.0, an elongation at break, determined according to DIN ISO 7619, ranging from 500 to 800, a tensile strength, determined according to ASTM D 412 or DIN 53504-S2, ranging from 30.0 to 60.0 MPa, a melt flow resistance, determined according to ASTM D 1238 or DIN EN ISO 1133, ranging from 50.0 to 100.0 g / 10 min, and a melt flow resistance, determined according to DIN ISO 4649, ranging from 5.0 to 60.0 mm ３ 1. A thermoplastic polyurethane coating composition characterized by an abrasion index in the range of

48. 1. A method of forming a thermoplastic polyurethane coating composition, comprising: iv) mixing at least one polyol, at least one diol, and optionally at least one catalyst; v) adding the mixture obtained in step (i) to at least one polyisocyanate and heating the mixture obtained at a temperature in the range of 30 to 120°C to obtain a polyurethane; A method comprising:

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