EP2225298A1 - Curable compositions having less volatilization - Google Patents

Abstract

The invention particularly relates to curable compositions comprising at least one polyisocyanate, at least one amine that is blocked by means of aldehyde or ketone, and at least one carboxylic acid hydrazide or sulfonic acid hydrazide which has a minimum melting point of 100°C, especially at least 150°C. Surprisingly, after being cured using moisture at room temperature and when being heated to increased temperatures, significantly fewer volatile components of such compositions volatilize than in the corresponding compositions that do not contain said hydrazide.

Description

 HARDENABLE COMPOSITIONS WITH REDUCED GASIFICATION

Technical area

The present invention relates to the field of moisture-curing polyurethane compositions and their use, in particular as elastic adhesives in vehicle construction.

State of the art

Curable compositions containing isocyanate groups, also referred to as polyurethane compositions, have long been used in a wide variety of applications, including as one- and two-part elastic adhesives, sealants or coatings. For better curing of such compositions, these moisture-activatable amine crosslinking agents, so-called "blocked amines" or "latent hardeners", can be added which suppress the direct, carbon dioxide (CO ₂ ) -producing reaction of the isocyanate groups with moisture and thus the formation of undesired gas bubbles largely prevent in the cured composition.

However, the use of blocked amines can also cause problems, in particular due to the fact that aldehydes or ketones are formed during the curing reaction. These so-called "cleavage products" are not incorporated into the polyurethane matrix and can therefore escape into the environment by evaporation or migration.The aldehydes or ketones formed from the blocked amines often represent odorous and / or harmful substances.

Especially in indoor applications, the outgassing of organic substances from, for example, an adhesive into the ambient air can be problematic. Volatile substances quickly accumulate in the interior and, especially if they are odor-intensive, can cause nausea or respiratory irritation. Heavy volatile, low-odor substances are usually not directly noticeable; but they can be deposited by condensation on surfaces and thereby gradually lead to the formation of fittings, for example Slices. In the automotive industry, the formation of such fittings, which can lead to troublesome turbidity, referred to as "fogging." In materials such as adhesives, which are to be used in the vehicle interior, there are generally laid out with respect to ausgasbaren substances strict standards.

WO 2004/013088 A1 and WO 2007/036571 A1 disclose blocked amines in the form of odor-free aldimines and polyurethane compositions containing such aldimines. The aldehydes released during the curing of the compositions are odor-free, relatively low-volatility compounds which largely remain in the hardened composition at room temperature. At elevated temperature, however, it may still lead to outgassing of these aldehydes from the composition.

DE 1 156 552 and US Pat. No. 6,051,620 disclose hydrazide-containing polyurethane compositions. In these systems, the hydrazides used are reacted before or during the reaction of the isocyanate groups.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a polyurethane composition which has the advantages of the compositions known from the prior art that cure by means of blocked amines, but exhibits a markedly reduced outgassing of aldehydes or ketones in the cured state, especially at elevated temperature, for example at 80 ⁰ C or higher.

Surprisingly, it has been found that curable compositions according to claim 1, which in addition to a blocked by aldehyde or ketone amine a hydrazide of a carboxylic or sulfonic acid having a sufficiently high melting point, solve this problem. These compositions cure with moisture at room temperature or a slightly elevated temperature, in particular below 40 ^° C., without significant involvement of the hydrazide, resulting in aldehydes and / or ketones. Upon heating of the cured compositions, in particular on 80 ⁰ C and higher, the hydrazide begins to react with the resulting aldehydes and / or ketones to low-volatility condensation products that do not outgas even at high temperatures. The cured compositions therefore have particular advantages in fogging behavior.

Further objects of the invention are a method for bonding according to claim 19, for sealing according to claim 18 and for coating according to claim 21, the resulting article according to claim 22, and a cured composition according to claim 23. Finally form an aldazide according to claim 24 and Use of a hydrazide according to claim 28 and 29 further aspects of the present invention.

Preferred embodiments of the invention are subject of the dependent claims.

Ways to carry out the invention

The invention relates to a curable composition comprising a) at least one polyisocyanate P, b) at least one amine BA blocked by aldehyde or ketone, c) at least one hydrazide HY of a carboxylic or sulfonic acid having a melting point of at least 100 ^° C., in particular of at least 150 ^° C, with the proviso that the hydrazide HY is present in an amount of 0.3 to 1.1 equivalent hydrazide groups per equivalent of aldehyde or keto groups by which the amine BA is blocked.

The term "hydrazide" as used herein refers to the condensation product of a carboxylic or sulphonic acid and hydrazine. [H Die] The described curable composition comprises at least one

Polyisocyanate P.

The term "polyisocyanate" as used herein includes compounds having two or more isocyanate groups, whether or not These are monomeric diisocyanates, oligomeric polyisocyanates or isocyanate group-containing polymers having a relatively high molecular weight.

The term "polymer" in the present document comprises, on the one hand, a collective of chemically uniform, but different in terms of degree of polymerization, molecular weight and chain length macromolecules, which was prepared by a polyreaction (polymerization, polyaddition, polycondensation) Such a group of macromolecules from polyreactions, ie compounds which have been obtained by reactions, such as additions or substitutions, of functional groups on predetermined macromolecules and which may be chemically uniform or chemically nonuniform.The term also includes so-called prepolymers, that is to say reactive oligomeric pre-adducts whose functional groups are involved in the construction of macromolecules.

Suitable as polyisocyanate P in one embodiment is an isocyanate group-containing polyurethane polymer PUP.

The term "polyurethane polymer" encompasses all polymers which are prepared by the so-called diisocyanate-polyaddition process, including those polymers which are almost or completely free of urethane groups Examples of polyurethane polymers are polyether polyurethanes, polyester polyurethanes, polyethers A suitable polyurethane polymer PUP is obtainable in particular from the reaction of at least one polyol with at least one polyisocyanate, this reaction being possible by the polyol and the polyisocyanate being purified by customary processes, such as polyureas, polyureas, polyureaureas, polyisocyanurates and polycarbodiimides. for example, at temperatures of 50 ⁰ C to 100 ⁰ C, optionally with the concomitant use of suitable catalysts, are reacted, wherein the polyisocyanate is metered so that its isocyanate groups in relation to the hydroxyl groups of the polyol in stoichiometric excess vorhan Advantageously, the polyisocyanate is metered so that an NCO / OH ratio from 1.3 to 5, in particular one of 1.5 to 3, is complied with. The "NCO / OH ratio" is understood to mean the ratio of the number of isocyanate groups used to the number of hydroxyl groups used. [Polyurethan ein] In the polyurethane polymer PUP, after the reaction of all the hydroxyl groups of the polyol, a content of free isocyanate groups of from 0.5 to 15% by weight remains. %, more preferably from 0.5 to 10% by weight.

Optionally, the polyurethane polymer PUP may be made using plasticizers, with the plasticizers used containing no isocyanate-reactive groups. Examples of suitable polyols for the preparation of a polyurethane polymer PUP are the following commercial polyols or mixtures thereof:

- Polyoxyalkylenpolyole, also called polyether polyols or oligoetherols, which are polymerization of ethylene oxide, 1, 2-propylene oxide, 1, 2- or 2,3-butylene oxide, oxetane, tetrahydrofuran or mixtures thereof, possibly polymerized with the aid of a starter molecule having two or more active Hydrogen atoms, such as water,

Ammonia or compounds with several OH or NH groups such as 1, 2-ethanediol, 1, 2- and 1, 3-propanediol, neopentyl glycol, diethylene glycol, triethylene glycol, the isomeric dipropylene glycols and

Tripropylene glycols, the isomeric butanediols, pentanediols, hexanediols,

Heptanediols, octanediols, nonanediols, decandiols, undecanediols, 1, 3 and 3

1,4-cyclohexanedimethanol, bisphenol A, hydrogenated bisphenol A, 1,1,1-trimethylolethane, 1,1,1-trimethylolpropane, glycerol, aniline, as well as mixtures of the abovementioned compounds. Can be used both

Polyoxyalkylenpolyole, which have a low degree of unsaturation

(measured according to ASTM D-2849-69 and expressed in milliequivalent

Unsaturation per gram of polyol (mEq / g) prepared for example with

Help from so-called Double Metal Cyanide Complex catalysts (DMC catalysts), as well as polyoxyalkylene polyols with a higher

Unsaturation degree, prepared for example by means of anionic

Catalysts such as NaOH, KOH, CsOH or alkali metal alkoxides. Particularly suitable are polyoxyalkylenediols or polyoxyalkylenetriols, in particular polyoxyethylene and polyoxypropylene di- and triols. Especially suitable are polyoxyalkylenediols and -triols having a degree of unsaturation lower than 0.02 meq / g and having a molecular weight in the range from 1 000 to 30 000 g / mol, and also polyoxypropylene diols and triols having a molecular weight of 400-800 g / mol.

Also particularly suitable are so-called ethylene oxide-terminated ("EO-endcapped", ethylene oxide-endcapped) polyoxypropylene polyols, the latter being special polyoxypropylene-polyoxyethylene polyols obtained, for example, by pure polyoxypropylene polyols, especially polyoxypropylene diols and triols, after completion of the polypropoxylation reaction Ethylene oxide are further alkoxylated and thereby have primary hydroxyl groups.

Styrene-acrylonitrile or acrylonitrile-methyl methacrylate grafted polyether polyols.

Polyesterpolyols, also called oligoesterols, prepared for example from dihydric to trihydric alcohols such as 1, 2-ethanediol, diethylene glycol, 1, 2-propanediol, dipropylene glycol, 1, 4-butanediol, 1, 5-pentanediol, 1 , 6-hexanediol, neopentyl glycol, glycerol, 1,1,1-trimethylolpropane or mixtures of the abovementioned alcohols with organic dicarboxylic acids or their anhydrides or esters such as succinic acid, glutaric acid, adipic acid, suberic acid, sebacic acid, dodecanedicarboxylic acid, maleic acid, fumaric acid, phthalic acid , Isophthalic acid, terephthalic acid and hexahydrophthalic acid or mixtures of the abovementioned acids, as well as polyester polyols from lactones such as ε-caprolactone.

Polycarbonate polyols as obtainable by reacting, for example, the abovementioned alcohols used to form the polyesterpolyols with dialkyl carbonates, diaryl carbonates or phosgene. At least two hydroxyl-bearing block copolymers which have at least two different blocks of polyether, polyester and / or polycarbonate structure of the type described above.

Polyacrylate and polymethacrylate polyols. Polyhydrocarbyl polyols, also called oligohydrocarbonols, such as, for example, polyhydroxy-functional ethylene-propylene, ethylene-butylene or ethylene-propylene-diene copolymers, for example produced by Kraton Polymers, or polyhydroxy-functional copolymers of dienes, such as 1,3-butanediene or diene mixtures and vinyl monomers such as styrene, acrylonitrile or isobutylene, or polyhydroxy-functional polybutadiene polyols such as those prepared by copolymerization of 1, 3-butadiene and allyl alcohol and which may also be hydrogenated. - Polyhydroxy-functional acrylonitrile / butadiene copolymers, as they can be prepared, for example, from epoxides or aminoalcohols and carboxyl-terminated acrylonitrile / butadiene copolymers (commercially available under the name of Hycar ^® CTBN from Hanse Chemie).

These stated polyols preferably have an average molecular weight of from 250 to 30,000 g / mol, in particular from 400 to 20,000 g / mol, and preferably have an average OH functionality in the range from 1.6 to 3.

Preferred polyols are polyether, polyester, polycarbonate and polyacrylate polyols, preferably diols and triols. Particularly preferred are polyether polyols, especially polyoxypropylene and polyoxypropylene polyoxyethylene polyols.

In addition to these mentioned polyols, small amounts of low molecular weight di- or polyhydric alcohols such as 1, 2-ethanediol, 1, 2- and 1, 3-propanediol, neopentyl glycol, diethylene glycol, triethylene glycol, the isomeric dipropylene glycols and tripropylene glycols, the isomeric Butanediols, pentanediols, hexanediols, heptanediols, octanediols, nonanediols, decanediols, undecanediols, 1, 3- and 1, 4-cyclohexanedimethanol, hydrogenated bisphenol A, dimeric fatty alcohols, 1,1,1-trimethylolethane, 1,1,1, -Tn- methylolpropane, glycerol, pentaerythritol, sugar alcohols such as XyNt, sorbitol or mannitol, sugars such as sucrose, other higher alcohols, low molecular weight alkoxylation products of the aforementioned di- and polyvalent ones Alcohols, as well as mixtures of the aforementioned alcohols in the preparation of the polyurethane polymer PUP be used. Similarly, small amounts of polyols having an average OH functionality of more than 3 may be included, for example, sugar polyols.

Aromatic or aliphatic polyisocyanates, in particular the diisocyanates, are used as the polyisocyanate for the preparation of a polyurethane polymer PUP containing isocyanate groups.

The term "aromatic isocyanate" refers to an organic compound which has exclusively aromatic isocyanate groups. "Aromatic" refers to an isocyanate group bonded to an aromatic or heteroaromatic radical. The term "aliphatic isocyanate" refers to an organic compound containing aliphatic isocyanate groups. "Aliphatic" refers to an isocyanate group attached to an aliphatic, cycloaliphatic or arylaliphatic radical.

Suitable aromatic polyisocyanates are, for example, monomeric di- or triisocyanates such as 2,4- and 2,6-toluene diisocyanate and any desired mixtures of these isomers (TDI), 4,4'-, 2,4'- and 2,2'-diphenylmethanediisocyanates. nat and any mixtures of these isomers (MDI), mixtures of MDI and MDI homologs (polymeric MDI or PMDI), 1, 3 and 1, 4-Phenylendiisocyana- nat, 2,3,5,6-tetramethyl-1, 4 diisocyanatobenzene, naphthalene-1, 5-diisocyanate (NDI), 3,3'-dimethyl-4,4'-diisocyanatodiphenyl (TODI), dianisidine diisocyanate (DADI), 1,3,5-tris (isocyanatomethyl) benzene, Tris (4-isocyanatophenyl) methane, tris (4-isocyanatophenyl) thiophosphate, oligomers and polymers of the abovementioned isocyanates, as well as any desired mixtures of the aforementioned isocyanates. Preferred are MDI and TDI.

Suitable aliphatic polyisocyanates are, for example, monomeric di- or triisocyanates, such as 1,4-tetramethylene diisocyanate, 2-methylpentamethylene-1,5-diisocyanate, 1,6-hexamethylene diisocyanate (HDI), 2,2,4 and 2,4, 4-trimethyl-1,6-hexamethylene diisocyanate (TMDI), 1,10-decamethylene diisocyanate, 1,12-dodecamethylene diisocyanate, lysine and lysine ester diisocyanate, cyclohexane 1, 3 and -1, 4-diisocyanate, 1-methyl- 2,4- and 2,6-diisocyanato cyclohexane and any desired mixtures of these isomers (HTDI or H ₆ TDI), 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (= isophorone diisocyanate or IPDI), perhydro-2,4'- and -4 , 4'-diphenylmethane diisocyanate (HMDI or Hi ₂ MDI), 1, 4-diisocyanato-2,2,6-trimethylcyclohexane (TMCDI), 1, 3- and 1, 4-bis (isocyanatomethyl) cyclohexane, m- and p-Xylylene diisocyanate (m- and p-XDI), m- and p-tetramethyl-1,3-and -1,4-xylylene diisocyanate (m- and p-TMXDI), bis- (1-isocyanato-1-methylethyl) -naphthalene, dimer and trimer fatty acid isocyanates, such as 3,6-bis (9-isocyanatonyl) -4,5-di- (1 -heptenyl) -cyclohexene (dimeryl diisocyanate), α, α, α ', α' , α ", α" -hexamethyl-1, 3,5-mesitylentriiso- cyanate, oligomers and polymers of the aforementioned isocyanates, and any mixtures of the aforementioned isocyanates. Preferred are HDI and IPDI.

Preference is given to polyurethane polymers PUP with aromatic isocyanate groups.

As polyisocyanate P is suitable in a further embodiment

Polyisocyanate PI in the form of a monomeric di- or triisocyanate or an oligomer of a monomeric diisocyanate, wherein, for example, the abovementioned aromatic and aliphatic di- and triisocyanates are suitable as monomeric di- or triisocyanate. Particularly suitable oligomers of a monomeric diisocyanate are the oligomers of HDI, IPDI and TDI. Such oligomers are in practice usually mixtures of substances having different degrees of oligomerization and / or chemical structures. They preferably have an average NCO functionality of 2.1 to 4.0 and in particular contain isocyanurate, iminooxadiazinedione, uretdione, urethane, biuret , Allophanate, carbodiimide, uretonimine or oxadiazinetrione groups. Preferably, they have a low content of monomeric diisocyanates. Commercially available types are in particular HDI biurets, for example, Desmodur ^® N 100 and Desmodur ^® N 3200 (from Bayer), Tolonate ^® HDB and Tolonate ^® HDB-LV (Rhodia) and Duranate ^® 24A-100 (of Asahi Kasei); HDI-Isocyanurates such as Desmodur ^® N 3300, Desmodur ^® N 3600 and Desmodur ^® N 3790 BA (Bayer), Tolonate ^® HDT, Tolonate ^® HDT LV and Tolonate ^® HDT-LV2 (from Rhodia), Duranate ^® TPA-100 and Duranate ^® THA-100 (by Asahi Kasei) and Coronate HX ^® (from Nippon Polyurethane); HDI uretdiones, for example Desmodur ^® N 3400 (Bayer); HDI Iminooxadiazindiones, for example Desmodur ^® XP 2410 (Bayer); HDI allophanates, such as Desmodur ^® VP LS 2102 (Bayer); IPDI isocyanurates, such as Desmodur ^® Z 4470 (from Bayer), and Vestanat ^® T1890 / 100 (from Evonik); TDI oligomers, for example, Desmodur ^® IL (Bayer); and mixed isocyanurates based on TDI / HDI, for example, Desmodur HL ^® (Bayer).

In a further embodiment, the polyisocyanate P is a

Polyisocyanate PI in the form of a liquid at room temperature form of MDI or a form of polymeric MDI (PMDI).

Formulated at room temperature forms of MDI (so-called "modified MDI") represent mixtures of MDI with MDI derivatives, such as MDI carbodiimides, MDI uretonimines or MDI urethanes. Commercially available types of modified MDI are, for example Desmodur ^® CD, Desmodur ^® PF and Desmodur ^® PC (from Bayer), Lupranat ^® MM 103 (from BASF), Isonate ^® M 143 (Dow) and Suprasec ^® 2020 and Suprasec ^® 2388 (from Huntsman). When polymeric MDI or PMDI mixtures of MDI and MDI

Homologs designated. Commercially available types of PMDI are, for example Desmodur ^® VL, Desmodur ^® VL 50, Desmodur ^® VL R 10, Desmodur ^® VL R 20 and Desmodur ^® VKS 20 F (from Bayer), Lupranat ^® M 10 R and Lupranat ^® M 20 R ( ^® from BASF), Isonate ^® M 309, Voranate M 229 and Voranate M ^® 580 (from Dow) and Suprasec ^® 5025, Suprasec 2050 and Suprasec ^{® ®} 2487 (from Huntsman).

Preferred as the polyisocyanate PI are PMDI, forms of MDI that are liquid at room temperature, as well as oligomers of HDI, IPDI and TDI, in particular the isocyanurates. Particularly preferred polyisocyanates PI are those having aromatic isocyanate groups. Most preferred as the polyisocyanate PI are MDI, in particular MDI types with a high proportion, in particular 50% by weight or more, of 2,4'-isomer, PMDI, and forms of MDI which are liquid at room temperature.

In another embodiment, the polyisocyanate P is a

Mixture consisting of at least one polyurethane polymer PUP and at least one polyisocyanate PI, as described above.

Usually, the polyisocyanate P is present in an amount of from 5 to 95% by weight, preferably in an amount of from 10 to 90% by weight, based on the total composition. In filled compositions, i. Compositions containing a filler, the polyisocyanate P is preferably present in an amount of 5 to 60% by weight, especially 10 to 50% by weight, based on the total composition.

The described curable composition further comprises at least one aldehyde or ketone blocked amine BA. Under an aldehyde or ketone blocked amine BA is a

Compound understood which contains at least one blocked by means of aldehyde or ketone amino group selected from the group consisting of aldimino, Ketiminogruppen, enamino groups and oxazolidino groups. The said aldimine or aldehyde or ketone is in this case free of OH, SH and NH groups.

Suitable as blocked amine BA in one embodiment is an aldimine BA1 of the formula (I) where n is an integer from 1 to 5, A is the residue of an amine B after removal of n primary amino groups, and

Y is an organic, optionally heteroatom-containing, radical having 1 to 35 carbon atoms.

As the "primary amino group" in the present document is an NH ₂ -

Denotes a group which is bonded to an organic radical, and as

"Secondary amino group" is an NH group which is bonded to two organic radicals, which may also be part of a ring together.

Preferred aldimines BA1 of the formula (I) are aldimines BA1 of the formula (Ia) and (Ib),

where R ¹ and R ² are each independently of one another a monovalent hydrocarbon radical having 1 to 12 C atoms, or together represent a bivalent hydrocarbon radical having 4 to 20 C atoms, the part of an optionally substituted, carbocyclic ring having 5 to 8 , preferably 6, is C atoms;

Z ^{1 is} a monovalent hydrocarbon radical having 1 to 32 C atoms, which optionally has at least one heteroatom, in particular oxygen in the form of ether, carbonyl or ester groups, or in particular nitrogen in the form of tertiary amino groups; Z ^{2 is} either a substituted or unsubstituted aryl or heteroaryl group which has a ring size of 5 to 8, preferably 6, atoms, O or is CR ⁸ , wherein R ^{8 represents} a hydrogen atom or an alkoxy group, or represents a substituted or unsubstituted alkenyl or arylalkenyl group having at least 6 C atoms; and A and n have the meanings already mentioned.

Preferably, R ¹ and R ² in formula (I a) each represent a methyl group.

Furthermore, Z ¹ in formula (I a) preferably represents a radical of the formula (II) or (III) or (IV)

in which

R ^{3 is} a hydrogen atom or an alkyl group or a

Cycloalkyl group or an arylalkyl group having 1 to 12 C atoms;

R ^{4 stands} for a hydrocarbon radical having 1 to 30 C atoms, which optionally contains ether oxygen atoms;

R ^{5 is} either a hydrogen atom, or a linear or branched alkyl radical having 1 to 30 C atoms, optionally with cyclic moieties and optionally with at least one heteroatom, in particular oxygen in the form of ether, carbonyl or ester groups, is or is a mono- or polyunsaturated, linear or branched hydrocarbon radical having 5 to 30 carbon atoms, or represents an optionally substituted, aromatic or heteroaromatic 5- or 6-membered ring; and R ⁶ and R ⁷ are each, independently of one another, each a monovalent aliphatic, cycloaliphatic or arylaliphatic radical having 1 to 20 C atoms and which optionally contains heteroatoms in the form of ether oxygen or tertiary amine nitrogen, or together for a bivalent aliphatic radical having 3 to 20 C atoms, which is part of an optionally substituted heterocyclic ring having 5 to 8, preferably 6, ring atoms and, in addition to the nitrogen atom, optionally contains further heteroatoms in the form of ether oxygen or tertiary amine nitrogen, stand.

Dotted lines in the formulas in this document each represent the bond between a substituent and the associated moiety.

Preferably, R ³ in the formulas (II), (III) and (IV) is a hydrogen atom. R ⁴ in formula (II) preferably represents a hydrocarbon radical having 6 to 30, in particular having 11 to 30, carbon atoms, which optionally contains ether oxygen atoms.

R ⁵ in formula (III) preferably represents a linear or branched one

Alkyl radical having 6 to 30, in particular having 11 to 30, carbon atoms, optionally with cyclic moieties and optionally with at least one heteroatom, or for a mono- or polyunsaturated, linear or branched

Hydrocarbon radical having 6 to 30, in particular having 11 to 30, carbon atoms.

Most preferably, R ⁵ in formula (III) is a C 1 alkyl radical.

R ⁶ and R ⁷ in formula (IV) are each independently of one another methyl, ethyl, propyl, isopropyl, butyl, isobutyl, 2-ethylhexyl,

Cyclohexyl or benzyl, or they form together - including the

Nitrogen atom - a ring, in particular a pyrrolidine, piperidine, Morpholine or N-alkylpiperazine ring, this ring being optionally substituted.

An aldimine BA1 of the formula (I) is obtainable by a condensation reaction with elimination of water between at least one amine B of

Formula (V) and at least one aldehyde ALD of the formula (VI). The aldehyde

ALD of the formula (VI) is used here with respect to the amino groups of the amine B stoichiometrically or in stoichiometric excess.

In the formulas (V) and (VI), A, n and Y have the meanings already mentioned.

As amine B of formula (V) are suitable in one embodiment polyamines having at least two primary amino groups, such as

- Aliphatic, cycloaliphatic or arylaliphatic diamines, for example, ethylenediamine, 1, 2-propanediamine, 1, 3-propanediamine, 2-methyl-1, 2-propanediamine, 2,2-dimethyl-1, 3-propanediamine, 1, 3-butanediamine , 1, 4-butanediamine, 1, 3-pentanediamine (DAMP), 1, 5-pentanediamine, 1, 5-diamino-2-methylpentane (MPMD), 1, 6-hexanediamine, 2,5-dimethyl-1, 6 -hexanediamine, 2,2,4- and 2,4,4-trimethylhexamethylenediamine (TMD), 1, 7-heptanediamine, 1, 8-octanediamine, 1, 9-nonanediamine, 1, 10-decanediamine, 1,11-undecanediamine , 1, 12-dodecanediamine and methyl bis (3-aminopropyl) amine, 1, 2, 1, 3 and 1, 4-diamino cyclohexane, bis (4-aminocyclohexyl) methane, bis (4 -amino-3-methylcyclohexyl) methane, bis (4-amino-3-ethylcyclohexyl) methane, bis (4-amino-3,5-dimethylcyclohexyl) methane, bis (4-amino 3-ethyl-5-methylcyclohexyl) methane (M-MECA), 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane (= isophoronediamine or IPDA), 2- and 4-methyl-1, 3-diaminocyclohexane and mixtures thereof, 1, 3 and 1, 4-bis (aminomet hyl) cyclohexane, 2,5 (2,6) bis (aminomethyl) bicyclo [2.2.1] heptane (NBDA), 3 (4), 8 (9) bis (aminomethyl) tricyclo [5.2. 1.0 ² ' ⁶ ] - decane, 1, 4-diamino-2,2,6-trimethylcyclohexane (TMCDA), 1, 8-menthanediamine, 3,9-bis- (3-aminopropyl) -2,4,8,10-tetraoxaspiro [5.5] undecane, and 1, 3- and 1, 4-xylylenediamine;

Ether group-containing aliphatic diamines, for example bis (2-aminoethyl) ether, 3,6-dioxaoctane-1, 8-diamine, 4,7-dioxadecane-1, 10-diamine, 4,7-dioxadecane-2.9 -diamine, 4,9-dioxadodecane-1, 12-diamine, 5,8-dioxadodecane-3,10-diamine and higher oligomers of these diamines, bis (3-aminopropyl) -polytetrahydrofurans and other polytetrahydrofuran diamines having molecular weights in the range of, for example, 350 to 5200, as well as polyoxyalkylene diamines. The latter are typically products from the amination of polyoxyalkylene diols, and are available, for example under the name Jeffamine ^® (from Huntsman), under the name polyetheramine (from BASF) or under the name PC Amine ^® (from Nitroil). Particularly suitable polyoxyalkylene diamines are Jeffamine ^® D-230, Jeffamine ^® D-400, Jeffamine ^® D-2000, Jeffamine ^® D-4000, Jeffamine ^® XTJ-511, Jeffamine ^® ED-600, Jeffamine ^® ED-900, Jeffamine ^® ED-2003, Jeffamine ^® XTJ-568, Jeffamine ^® XTJ-569, Jeffamine ^® XTJ-523, Jeffamine ^® XTJ-536, Jeffamine ^® XTJ-542, Jeffamine ^® XTJ-559; Polyetheramine D 230, polyetheramine D 400 and polyetheramine D 2000, PC ^Amine® DA 250, PC ^Amine® DA 400, PC ^Amine® DA 650 and PC ^Amine® DA 2000; aliphatic, cycloaliphatic or arylaliphatic triamines, such as 4-

Aminomethyl-1,8-octanediamine, 1,3,5-tris (aminomethyl) -benzene, 1,3,5-tris (aminomethyl) -cyclohexane;

- polyoxyalkylenetriamines which are typically products from the amination of polyoxyalkylenetriols and obtainable for example under the trade name Jeffamine ^® (from Huntsman), under the name polyetheramine (from BASF) or under the name PC Amine ^® (from Nitroil) such as Jeffamine ^® T-403, Jeffamine ^® T-5000; Polyetheramine T403, polyetheramine T5000; and PC ^Amine® TA 403, PC ^Amine® TA 5000;

- aromatic di- and triamines, such as 1, 2, 1, 3- and 1, 4-phenylenediamine, 2,4- and 2,6-toluenediamine (TDA), 3,4-toluenediamine, 3,5-dimethylthio -2,4- and -2,6-toluenediamine, 3,5-diethyl-2,4- and -2,6-toluenediamine diamine (DETDA), 2,4,6-triethyl-1,3-phenylenediamine, 2,4,6-triisopropyl-1,3-phenylenediamine, 3-ethyl-5-methyl-2,4-toluylenediamine, 3,5-diisopropyl-2,4-toluene diamine, 3,5-bis (1-methylpropyl) -2,4-toluenediamine, 3,5-bis (tert-butyl) -2,4-toluenediamine, 3-ethyl-5-isopropyl-2, 4-toluylenediamine, 5-isopropyl-2,4-toluenediamine diamine, 5- (tert-butyl) -2,4-toluenediamine, 4,6-bis (1-methylpropyl) -1,3-phenylenediamine, 4-isopropyl-6- (tert -butyl) -1,3-phenylenediamine, 4-ethyl-6-isopropyl-1,3-phenylenediamine, 4-ethyl-6- (2-methylpropyl) -1,3-phenylenediamine. 4-ethyl-6- (1-methylpropyl) -1,3-phenylenediamine, 4-ethyl-6- (2-methylpropyl) -1, 3-phenylenediamine, 4-isopropyl-6- (1-methylpropyl) -1, 3-phenylenediamine, 4- (tert-butyl) -6- (2-methylpropyl) -1, 3-phenylenediamine, 4-cyclopentyl-6-ethyl-1,3-phenylenediamine, 4-cyclopentyl-6-isopropyl-1, 3-phenylenediamine, 4,6-dicyclopentyl-1,3-phenylenediamine, 3-isopropyl-2,6-toluylenediamine, 2-methylpropyl- (4-chloro-3,5-diaminobenzoate), tert-butyl (4-chloro-3,5-diaminobenzoate), 2,6-diaminopyridine, melamine, 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethane (MDA), 3,3'-dimethyl 4,4'-diaminodiphenylmethane, 3,3'-dichloro-4,4'-dia minodiphenylmethane (MOCA), 3,3 ', 5,5'-tetraethyl-4,4'-diaminodiphenylmethane (M-DEA), 3,3', 5,5'-tetraethyl-2,2'-dichloro-4, 4'-diaminodiphenylmethane (M-CDEA), 3,3'-diisopropyl-5,5'-dimethyl-4,4'-diaminodiphenylmethane (M-MIPA), 3,3 ', 5,5'-tetraisopropyl-4, 4'-diaminodiphenylmethane (M-DIPA), 3,3 ', 5,5'-tetra (1-methylpropyl) -4,4'-diaminotiphenylmethane, 3,3'-dimethyl-5,5'-di tert-butyl-4,4'-diaminodiphenylmethane, 3,3'-di-tert-butyl-4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenylsulfone (DDS), 4-amino-N- (4-aminophenyl) benzenesulfonamide, 5,5'-methylenedianthranilic acid, dimethyl (5,5'-methylenedithethranilate), 1,3-propylene-bis (4-aminobenzoate), 1,4-butylene-bis- (4-aminobenzoate), polytetramethylene-bis (4-aminobenzoate) (available as Versalink ^® from Air Products) and 1, 2-bis (2-aminophenylthio) ethane. Preference is given to a polyamine having at least two primary amino groups selected from the group consisting of 1,6-hexamethylenediamine, MPMD, DAMP, IPDA, TMD, 1,3-xylylenediamine, 1,3-bis (aminomethyl) cyclohexane, Bis (4-aminocyclohexyl) methane, bis (4-amino-3-methylcyclohexyl) methane, 3 (4), 8 (9) -bis (aminomethyl) -tricyclo [5.2.1.0 ² ' ⁶ ] decane , 1, 2-, 1, 3- and 1, 4-diaminocyclohexane, 1, 4-diamino-2,2,6-trimethylcyclohexane, 3,6-dioxo-octane-1, 8-diamine, 4,7-dioxadecane -1, 10-diamine, 4-aminomethyl-1, 8-octane diamine, polyoxyalkylene-polyamines having two or three amino groups, especially the types available under the trade name Jeffamine ^® D 230, D-400, D-2000, T-403 and T-5000 from Huntsman and analogous compounds from BASF or nitroil, 1, 3- and 1, 4-phenylenediamine, 2,4- and 2,6-toluenediamine, 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethane, 3,3'-dichloro-4,4'-diaminodiphenylmethane and mixtures of said polyamines.

As amine B of the formula (V), in a further embodiment, amines which have at least one primary amino group and at least one further reactive group which represents either a hydroxyl group, a secondary amino group or a mercapto group are suitable, for example

Amines having one or two primary and one secondary amino group, such as, for example, N-methyl-1,2-ethanediamine, N-ethyl-1,2-ethanediamine, N-butyl-1,2-ethanediamine, N-hexylamine 1,2-ethanediamine, N- (2-ethylhexyl) -1,2-ethanediamine, N-cyclohexyl-1,2-ethanediamine, 4-aminomethylpiperidine, 3- (4-aminobutyl) piperidine, N- (2 Aminopropyl) piperazine, diethylenetriamine (DETA), bis-hexamethylenetriamine (BHMT), 3- (2-aminoethyl) aminopropylamine; Di- and triamines from cyanoethylation or cyanobutylation and subsequent hydrogenation of primary mono- and diamines, for example N-methyl-1,3-propanediamine, N-ethyl-1,3-propanediamine, N-butyl-1,3-propanediamine diamine, N-hexyl-1,3-propanediamine, N- (2-ethylhexyl) -1,3-propanediamine, N-dodecyl-1,3-propanediamine, N-cyclohexyl-1,3-propanediamine, 3-methylamino 1-pentylamine, 3-ethylamino-1-pentylamine, 3-butylamino-1-pentylamine, 3-hexylamino-1-pentylamine, 3- (2-ethylhexyl) amino-1-pentylamine, 3-dodecylamino-1-pentylamine , 3-cyclohexylamino-1-pentylamine, dipropylenetriamine (DPTA), N3- (3-aminopentyl) -1,3-pentanediamine, N5- (3-aminopropyl) -2-methyl-1,5-pentanediamine, N5- (3-amino-1-ethylpropyl) -2-methyl-1,5-pentanediamine, and fatty diamines such as N-cocoalkyl-1,3-propanediamine, N-oleyl-1,3-propanediamine, N-soyalkyl-1,3 propanediamine, N-tallowalkyl-1, 3-propanediamine, or N- (C _6-22 alkyl) -1, 3- propanediamine as erhältlic for example, under the trade name Duomeen ^® ex Akzo Nobel h are; the products of Michael-type addition of aliphatic primary di- or triamines with acrylonitrile, maleic or fumaric diesters, citraconic diesters, acrylic and methacrylic acid esters, Acrylic and methacrylic acid amides and itaconic diesters, reacted in the molar ratio 1: 1;

Hydroxyamines having a hydroxyl group and a primary amino group, for example 2-aminoethanol, 2-methylaminoethanol, 1-amino-2-propanol, 3-amino-1-propanol, 4-amino-1-butanol, 4-amino 2-butanol, 2-amino-2-methylpropanol, 5-amino-1-pentanol, 6-amino-1-hexanol, 7-amino-1-heptanol, 8-amino-1-octanol, 10-amino-1 decanol, 12-amino-1-dodecanol, A- (2-aminoethyl) -2-hydroxyethylbenzene, 3-aminomethyl-3,5,5-trimethylcyclohexanol; a primary amino-bearing derivatives of glycols such as diethylene glycol, dipropylene glycol, dibutylene glycol and higher oligomers and polymers of these glycols, for example 2- (2-aminoethoxy) ethanol, triethylene glycol monoamine, α- (2-hydroxymethylethyl) -ω- (2 -aminomethylethoxy) -poly (oxy (methyl-1,2-ethanediyl)); a hydroxyl group and a primary amino-bearing derivatives of polyalkoxylated trihydric or higher alcohols; Products from simple cyanoethylation and subsequent hydrogenation of glycols, for example 3- (2-hydroxyethoxy) propylamine, 3- (2- (2-hydroxyethoxy) -ethoxy) -propylamine and 3- (6-hydroxyhexyloxy) - propylamine;

Mercaptoamines such as 2-aminoethanethiol (cysteamine), 3-aminopropanethiol, 4-amino-1-butanethiol, 6-amino-1-hexanethiol, 8-amino-1-octanethiol, 10-amino-1-decanethiol, 12- Amino-1-dodecanethiol and aminothio sugars such as 2-amino-2-deoxy-6-thioglucose;

Amines having one or more primary and more than one secondary amino group, such as N, N'-bis (3-aminopropyl) ethylenediamine, tetramethylenetetramine (TETA), tetraethylenepentamine (TEPA), pentaethylenehexamine and higher homologs of linear polyethyleneamines, N, N'-bis (3-aminopropyl) ethylenediamine, products of multiple cyanoethylation or cyano-butylation and subsequent hydrogenation of primary di- and polyamines having multiple primary amino groups, such as N, N'-bis (3-aminopropyl) - ethylenediamine, N, N'-bis (3-aminopropyl) -1, 4-diaminobutane, N, N'-bis (3-aminopropyl) -2-methyl-1,5-pentanediamine, N, N ' -Bis- (3-amino-1-ethylpropyl) -2-methyl-1, 5-pen- tandiamin and polyethyleneimines of different degrees of polymerization (molar mass range 500 to 10OOOOO g / mol), as for example under the trade name Lupasol ^® from BASF in pure form or as aqueous Solutions are available, these polyethyleneimines contain not only primary and secondary but also tertiary amino groups;

Hydroxyamines having at least one hydroxyl group, at least one secondary and at least one primary amino group, such as those obtainable, for example, from cyanoethylation or cyanobutylation and subsequent hydrogenation of simple aliphatic hydroxyamines, for example N-hydroxyethyl-1,2-ethanediamine, N-hydroxypropyl -1, 2-ethanediamine, N-hydroxyethyl-1,3-propanediamine, N3-hydroxyethyl-1,3-pentanediamine; - Hydroxyamine having more than one hydroxyl group and one or more primary amino groups, in particular derivatives of polyalkoxylated trihydric or higher alcohols or polyalkoxylated polyamines, and amino sugars, such as glucosamine or galactosamine.

Of these, preferred are amines which are selected from the group consisting of N-methyl-1, 2-ethanediamine, N-ethyl-1, 2-ethanediamine, N-cyclo-hexyl-1, 2-ethanediamine, N-methyl-1 , 3-propanediamine, N-ethyl-1,3-propanediamine, N-butyl-1,3-propanediamine, N-cyclohexyl-1,3-propanediamine, 4-aminomethylpiperidine, 3- (4-aminobutyl) -piperidine , DETA, DPTA, BHMT, fatty diamines such as N-cocoalkyl-1,3-propanediamine, N-oleyl-1,3-propanediamine, N-soyaalkyl-1,3-propanediamine and N-tallowalkyl-1,3-propanediamine, 5 -Amino-1-pentanol, 6-amino-1-hexanol, 4- (2-aminoethyl) -2-hydroxyethylbenzene, 3-aminomethyl-3,5,5-trimethylcyclohexanol, 2- (2-aminoethoxy) ethanol , Triethylene glycol monoamine, 3- (2-hydroxyethoxy) propylamine, 3- (2- (2-hydroxyethoxy) ethoxy) propylamine and 3- (6-hydroxyhexyloxy) propylamine.

Suitable as aldehyde ALD of the formula (VI) are primary and secondary aliphatic aldehydes such as propanal, 2-methylpropanal, butanal, 2-methylbutanal, 2-ethylbutanal, pentanal, 2-methylpentanal, 3-methylpentanal, 4-methylpentanal, 2,3- Dimethyl pentanal, hexanal, 2-ethylhexanal, heptanal, octanal, nonanal, decanal, undecanal, 2-methyl-undecanal, dodecanal, methoxyacetaldehyde, cyclopropanecarboxaldehyde, cyclopentanecarboxaldehyde, cyclohexanecarboxaldehyde and diphenylacetaldehyde. As aldehyde ALD of the formula (VI) are particularly suitable aldehydes which are not enolisable, since they form aldimino groups in the reaction with primary amines, which can not tautomerize to enamino groups and therefore represent particularly well blocked amino groups. In particular, tertiary aliphatic and aromatic aldehydes represent non-enolisable aldehydes.

Particularly suitable aldehyde ALD of the formula (VI) are tertiary aliphatic aldehydes ALDI of the formula (VI a)

wherein R ¹ , R ² and Z ^{1 have} the meanings already mentioned. Suitable aldehyde ALDI of the formula (VI a) are, for example, pivaldehyde (= 2,2-dimethylpropanal), 2,2-dimethylbutanal, 2,2-diethylbutanal, 1-methyl-cyclopentanecarboxaldehyde, 1-methyl -cyclohexancarboxaldehyd;

Ethers of 2-hydroxy-2-methylpropanal and alcohols such as propanol, isopropanol, butanol and 2-ethylhexanol; Esters of 2-formyl-2-methylpropionic acid or 3-formyl-3-methylbutyric acid and alcohols such as propanol, isopropanol, butanol and 2-ethylhexanol; Esters of 2-hydroxy-2-methylpropanal and carboxylic acids such as butyric, isobutyric and 2-ethylhexanoic acid; and the ethers and esters of 2,2-disubstituted 3-hydroxypropanals, butanals or analogous higher aldehydes, especially of 2,2-dimethyl-3-hydroxypropanal, which are described below as being particularly suitable.

Particularly suitable aldehydes ALDI of the formula (VI a) are in one embodiment aldehydes ALD2 of the formula (VI b),

wherein R ¹ , R ² , R ³ and R ^{4 have} the meanings already mentioned. The aldehydes ALD2 of the formula (VI b) are ethers of aliphatic, cycloaliphatic or arylaliphatic 2,2-disubstituted 3-hydroxy aldehydes with alcohols or phenols of the formula R ⁴ -OH, for example Fatty alcohols or phenols. Suitable 2,2-disubstituted 3-hydroxy aldehydes are in turn obtainable from aldol reactions, in particular crossed aldol reactions, between primary or secondary aliphatic aldehydes, in particular formaldehyde, and secondary aliphatic, secondary cycloaliphatic or secondary arylaliphatic aldehydes, such as, for example, isobutyraldehyde, 2- Methylbutyraldehyde, 2-ethylbutyraldehyde, 2-methylvaleraldehyde, 2-ethylcaproic aldehyde, cyclopentanecarboxaldehyde, cyclohexanecarboxaldehyde, 1,2,3,6-tetrahydrobenzaldehyde, 2-methyl-3-phenylpropionaldehyde, 2-phenylpropionaldehyde (hydratropaldehyde) or diphenylacetaldehyde , Examples of suitable 2,2-disubstituted 3-hydroxy aldehydes are 2,2-dimethyl-3-hydroxypropanal, 2-hydroxymethyl-2-methyl-butanal, 2-hydroxy-methyl-2-ethyl-butanal, 2-hydroxymethyl-2-methyl pentanal, 2-hydroxymethyl-2-ethyl-hexanal, 1-hydroxymethyl-cyclopentanecarboxaldehyde, 1-hydroxymethylcyclohexanecarboxaldehyde i-hydroxymethylcyclohex-3-enecarboxaldehyde, 2-hydroxymethyl-2-methyl-3-phenyl- propanal, 3-hydroxy-2-methyl-2-phenyl-propanal and 3-hydroxy-2,2-diphenyl-propanal.

Particularly suitable aldehydes ALD2 of the formula (VI b) are 2,2-dimethyl-3-phenoxypropanal, 3-cyclohexyloxy-2,2-dimethylpropanal, 2,2-dimethyl-3- (2-ethylhexyloxy) -propanal , 2,2-dimethyl-3-lauroxy-propanal and 2,2-dimethyl-3-stearoxy-propanal.

Particularly suitable aldehydes ALDI of the formula (VI a) are aldehydes ALD 3 of the formula (VI c) in a further embodiment,

wherein R ¹ , R ² , R ³ and R ^{5 have} the meanings already mentioned.

The aldehydes ALD3 of the formula (VI c) are esters of 2,2-disubstituted 3-hydroxy aldehydes already described, such as 2,2-dimethyl-3-hydroxypropanal, 2-hydroxymethyl-2-methyl-butanal, 2-hydroxy methyl 2-ethyl-butanal, 2-hydroxymethyl-2-methyl-pentanal, 2-hydroxymethyl-2-ethyl-hexanal, 1-hydroxymethyl-cyclopentanecarboxaldehyde, 1-hydroxy Methyl-cyclohexanecarboxaldehyde i-hydroxymethylcyclohex-3-enecarboxalde- hyd, 2-hydroxymethyl-2-methyl-3-phenyl-propanal, 3-hydroxy-2-methyl-2-phenyl-propanal and 3-hydroxy-2,2 Examples of suitable carboxylic acids for this reaction are saturated aliphatic carboxylic acids, such as formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, 2-ethyl-caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, Undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, nonadecanoic acid, arachidic acid; monounsaturated aliphatic carboxylic acids such as palmitoleic acid, oleic acid, erucic acid; polyunsaturated aliphatic carboxylic acids such as linoleic acid, linolenic acid, elaeostearic acid, arachidonic acid; cycloaliphatic carboxylic acids such as cyclohexane carboxylic acid; arylaliphatic carboxylic acids such as phenylacetic acid; aromatic carboxylic acids such as benzoic acid, naphthoic acid, toluic acid, anisic acid; Isomers of these acids; Fatty acid mixtures from the industrial saponification of natural oils and fats such as rapeseed oil, sunflower oil, linseed oil, olive oil, coconut oil, oil of palm kernel oil and oil palm oil; and dicarboxylic acid monoalkyl and aryl esters, as obtained from the simple esterification of dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, 1,12-dodecanedioic acid, maleic acid, fumaric acid, hexahydrophthalic acid, hexa-hydroisophthalic acid, hexahydroterephthalic acid, 3, 6,9-Trioxaundecandisäure and similar derivatives of polyethylene glycol, with alcohols such as methanol, ethanol, propanol, butanol, higher homologues and isomers of these alcohols can be obtained. Preference is given to carboxylic acids having at least 7 C atoms, in particular those having at least 11 C atoms.

Particularly suitable aldehydes ALDI of the formula (VI a) are aldehydes ALD4 of the formula (VI d) in a further embodiment, wherein R ¹ , R ² , R ³ , R ⁶ and R ^{7 have} the meanings already mentioned.

An aldehyde ALD4 of the formula (VI d) is in particular obtainable as the product of a Mannich reaction or of a Mannich reaction analogous α-aminoalkylation, as known from the literature; it can therefore also be called a Mannich base. Here, a secondary aldehyde A1, another aldehyde A2 and a secondary aliphatic amine A3 are reacted with elimination of water to form an aldehyde ALD4.

Suitable aldehyde A1 are, for example, isobutyraldehyde, 2-methylbutyraldehyde, 2-ethylbutyraldehyde, 2-methylvaleraldehyde, 2-ethylcapronaldehyde, cyclopentanecarboxaldehyde, cyclohexanecarboxaldehyde,

1, 2,3,6-tetrahydrobenzaldehyde, 2-methyl-3-phenylpropionaldehyde, 2-phenylpropionaldehyde and diphenylacetaldehyde. Isobutyraldehyde is preferred.

Examples of suitable aldehyde A2 include formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, isobutyraldehyde, phenylacetaldehyde, benzaldehyde and substituted benzaldehydes, and also glyoxylic acid esters, in particular ethyl glyoxylate. Preferred is formaldehyde.

Suitable as a secondary aliphatic amine A3 are, for example, dimethylamine, diethylamine, dipropylamine, diisopropylamine, dibutylamine, diisobutylamine, di-sec-butylamine, dihexylamine, di (2-ethylhexyl) amine, dicyclohexylamine, N-methylbutylamine, N-ethylbutylamine, N- Methylcyclohexylamine, N-ethylcyclohexylamine, di-2-methoxyethylamine, pyrrolidine, piperidine, N-methylbenzylamine, N-isopropylbenzylamine, N-tert-butylbenzylamine, dibenzylamine, morpholine, 2,6-dimethylmorpholine, Bis (3-dimethylaminopropyl) amine, N-methyl or N-ethylpiperazine. Of these, preference is given to dimethylamine, diethylamine, dipropylamine, diisopropylamine, dibutylamine, diisobutylamine, bis (2-ethylhexyl) amine, N-methylcyclohexylamine, N-methylbenzylamine, N-isopropylbenzylamine, N-tert-butylbenzylamine, dibenzylamine, Pyrrolidine, piperidine, hexamethyleneimine, morpholine and 2,6-dimethylmorpholine. Aldehydes ALD5 of the formula (VI e) are particularly suitable as aldehyde ALD of the formula (VI) in a further embodiment.

O

[I (VIe)

S ² wherein Z ^{2 has} the meanings already mentioned.

Such aldehydes ALD5 are for example aromatic aldehydes, such as benzaldehyde, 2- and 3- and 4-tolualdehyde, 4-ethyl- and 4-propyl- and 4-

Isopropyl and 4-butylbenzaldehyde, 2,4-dimethylbenzaldehyde, 2,4,5-trimethylbenzaldehyde, 4-acetoxybenzaldehyde, 4-anisaldehyde, 4-ethoxybenzaldehyde, the isomeric di- and Trialkoxybenzaldehyde, 2-, 3- and 4 Nitrobenzaldehyde, 2- and 3- and 4-formylpyridine, 2-furfuraldehyde, 2-thiophenecarbaldehyde, 1- and 2-naphthylaldehyde, 3- and 4-phenyloxybenzaldehyde, quinoline-2-carbaldehyde and its 3, 4, 5-, 6-, 7- and 8-position isomers, as well as anthracene-9-carbaldehyde; and also glyoxal, glyoxalic acid esters such as methyl glyoxalate, cinnamaldehyde and substituted cinnamaldehydes.

Preferred aldehyde ALD of the formula (VI) are those mentioned

Aldehydes ALD2 of the formula (VI b), ALD3 of the formula (VI c), ALD4 of the formula (VI d) and ALD5 of the formula (VI e). Of these, particularly preferred are the aldehydes ALD3 of the formula (VI c), in particular those in which the radical R ^{5 has} 6 to 30 carbon atoms. Most preferred are odorless aldehydes ALD3 of the formula (VIc) in which the radical R ^{5 has} 11 to 30 carbon atoms.

The most preferred aldehyde ALD is 2,2-dimethyl-3-lauroyloxypropanal.

In a further embodiment, suitable as a blocked amine BA is a ketimine BA2 of the formula (VII)

in which

Z ³ and Z ⁴ are each, independently of one another, each a monovalent hydrocarbon radical having 1 to 12 C atoms, or together represent a bivalent hydrocarbon radical having 4 to 20 C atoms, the part of an optionally substituted, carbocyclic ring with 5 to 8, preferably 6, C atoms are; and n and A have the meanings already mentioned.

A ketimine BA2 of the formula (VII) is obtainable by a condensation reaction with elimination of water between at least one amine B of the formula (V) and at least one ketone of the formula (VIII). The ketone of the formula (VIII) is used in this case with respect to the amino groups of the amine B stoichiometric or in stoichiometric excess.

A- ^ NH ₂ ] _n (V)

In formula (VIII), Z ³ and Z ^{4 have} the meanings already mentioned.

Particularly suitable ketones of the formula (VIII) are acetone,

Methyl ethyl ketone, methyl propyl ketone, methyl isopropyl ketone, methyl isobutyl ketone, methyl pentyl ketone, methyl isopentyl ketone, diethyl ketone, dipropyl ketone,

Diisopropyl ketone, dibutyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone and actetophenone.

Suitable amine B of the formula (V) are the abovementioned amines B.

Suitable commercial diketimines example, Epikure ^® Curing Agent 3502 (from Resolution Performance Products) and Desmophen ^® LS 2965A (Bayer). Suitable as blocked amine BA in another embodiment is an enamine BA3 which has at least one enamine group of the formula (IX) and which is obtainable, for example, from the reaction of at least one secondary amine C with at least one aliphatic or cycloaliphatic aldehyde or ketone of the formula (X) with elimination of water.

In formulas (IX) and (X), Z ⁵ and Z ⁶ are each, independently of one another, each a hydrogen atom or a monovalent hydrocarbon radical having 1 to 12 C atoms, or together represent a bivalent hydrocarbon radical having 3 to 20 C atoms, which is part of an optionally substituted carbocyclic ring having 5 to 8, preferably 6, C atoms; and Z ⁷ represents a hydrogen atom or a monovalent hydrocarbon radical having 1 to 12 C atoms.

Suitable as secondary amine C in one embodiment are amines having at least two secondary amino groups, such as, for example, piperazine, tetramethylpiperazine, homopiperazine, 1,3-di (piperidin-4-yl) -propane, N, N'-dimethylhexamethylenediamine and homologues with higher alkyl or cycloalkyl groups in place of the methyl groups, N, N'-dimethyl-diethylenetriamine and N, N'-dimethyl-dipropylenetriamine.

In a further embodiment, amines having a hydroxyl group and a secondary amino group, such as, for example, N- (2-hydroxyethyl) piperazine, 4-hydroxy-piperidine, are suitable as secondary amine C in another embodiment and monoalkoxylated primary monoamines, ie reaction products of primary monoamines such as methylamine, ethylamine, propylamine, butylamine, hexylamine, 2-ethylhexylamine, benzylamine and fatty amines such as laurylamine or stearylamine, with stochiometric ratios of epoxides such as ethylene oxide, propylene oxide or butylene oxide 1: 1, for example N-methylethanolamine, N-ethyl-ethanolamine, N-butyl-ethanolamine and N-butyl-isopropanolamine.

In a further embodiment, amines having a mercapto group and a secondary amino group, such as, for example, N- (2-mercaptoethyl) piperazine, 4-mercapto-piperidine and 2-mercaptoethyl-butylamine, are suitable as secondary amine C.

Suitable aldehyde or ketone of the formula (X) are aldehydes which have at least one hydrogen atom in the α-position to the carbonyl group and are thus enolizable, for example propanal, 2-methylpropanal, butanal, 2-methylbutanal, 2-ethylbutanal, pentanal, 2 Methylpentanal, 3-methylpentanal, 4-methylpentanal, 2,3-dimethylpentanal, hexanal, 2-ethylhexanal, heptanal, octanal, nonanal, decanal, undecanal, 2-methyl-undecanal, dodecanal, methoxyacetaldehyde, cyclopropanecarboxaldehyde, cyclopentanecarboxaldehyde, cyclohexanecarboxaldehyde and diphenylacetaldehyde; and ketones which have at least one hydrogen atom in α-position to the carbonyl group and are thus enolizable, such as acetone, methyl ethyl ketone, methyl propyl ketone, methyl isopropyl ketone, methyl isobutyl ketone, methyl pentyl ketone, methyl isopentyl ketone, diethyl ketone, dipropyl ketone, diisopropyl ketone, dibutyl ketone, diisobutyl ketone, and in particular cyclic ketones, such as for example, cyclopentanone and cyclohexanone.

Suitable as a blocked amine BA in another embodiment is an oxazolidine BA4 of the formula (XI) in which

A ^{2 is} the residue of an amine after removal of n secondary amino groups;

G ^{2 is} an optionally substituted C ₂ - or C ₃ -alkylene radical; Each of Z ⁸ and Z ⁹ independently represents a hydrogen atom or a monovalent hydrocarbon radical having 1 to 12 C atoms; and n has the meanings already mentioned.

As "oxazolidino group" in this document both tetrahydrooxazole groups (5-membered ring) and tetrahydrooxazine groups (6-membered ring) are referred to.

An oxazolidine BA4 of the formula (XI) is obtainable, for example, from the reaction of at least one amine D of the formula (XII) with at least one aldehyde or ketone of the formula (XIII) with elimination of water.

O

JL (XIII)

In the formulas (XII) and (XIII), A ² , G ² , n, Z ⁸ and Z ^{9 have} the meanings already mentioned.

Suitable amine D of the formula (XII) are aliphatic hydroxyamines having a secondary amino group, such as, for example, diethanolamine,

Dipropanolamine and diisopropanolamine. Preferred as the amine D is diethanolamine, which can be reacted with an aldehyde or ketone of the formula (XIII) to give an oxazolidine of the formula (XI a).

In formula (XI a), Z ⁸ and Z ^{9 have} the meanings already mentioned.

An oxazolidine of the formula (XI a) can be reacted with a polyisocyanate such that the hydroxyl groups react with isocyanate groups. In this way, polyoxazolidines are available.

Suitable aldehydes or ketones of the formula (XIII) are the abovementioned aldehydes or ketones of the formula (XI), and also, for example, formaldehyde, benzaldehyde and substituted benzaldehydes. Preference is given to 2-methylpropanal.

Suitable commercial oxazolidines are for example Hardener OZ ™ (Bayer), Zoldine ^® RD-20, Zoldine ^® MS-52 and Zoldine ^® MS Plus (from Angus Chemical), and lncozol ^® 2, lncozol ^® 3, lncozol ^® LV, lncozol ^® 4 , Incozol ^® HP and Incozol ^® NC (from Industrial Copolymers).

Also suitable as blocked amine BA are compounds having two or more of the described blocked amino groups, which differ from one another.

A suitable commercial blocked amine with an aldimino and a Oxazolidinogruppe example, Zoldine ^® RD-4 (from Angus Chemical).

In the formulas (I), (I a), (I b), (VII) and (Xl), the index n is preferably 1 or 2 or 3, where blocked amines BA of the formulas (I), (I a) , (I b), (VII) and (Xl) with the index n = 1 in addition to the blocked amino group preferred have at least one reactive group in the form of a hydroxyl, a secondary amino group or a mercapto group on the amine moiety.

The blocked amino groups in the form of aldimino groups, keto-imino groups, enamino groups and / or oxazolidino groups of the blocked amine BA react to the exclusion of moisture with isocyanate groups not or only very slowly.

The blocked amine BA is advantageously present in the curable composition in an amount such that the ratio between the number of blocked amino groups and optionally present hydroxyl, mercapto and secondary amino groups and the number of isocyanate groups 0.1 to 1.1, preferably 0.2 to 0.9, in particular 0.5 to 0.9. If blocked amino groups are present in the form of oxazolidino groups, these are counted twice since these are formally difunctional after hydrolysis to isocyanate groups.

Preferred as the blocked amine BA in the described curable composition are the aldimines BA1 of the formula (I), the ketimines BA2 of the formula (VII), the enamines BA3 containing enamino groups of the formula (IX) and the oxazolidines BA4 of the formula (Xl).

Particularly preferred as blocked amine BA are the aldimines BA1, the ketimines BA2 and the oxazolidines BA4. Particularly preferred are the aldimines BA1 of the formula (I a) and the formula (I b) and the oxazolidines BA4. Most preferred as blocked amine BA are the aldimines BA1 of the formula (Ia) in which Z ^{1 is} a radical of the formula (II) or (III) or (IV), in particular a radical of the formula (III) ,

The described curable composition furthermore comprises at least one hydrazide HY of a carboxylic or sulfonic acid which has a melting point of at least 100 ^° C., in particular of at least 150 ^° C., having. The melting point of the hydrazide HY is preferably below 300 ^° C.

In the present document, the term "carboxylic acid" also includes carbonic acid. A hydrazide HY of a carboxylic acid has in particular the formula

(XIV a) or (XIV b), while a hydrazide HY of a sulfonic acid has the formula (XV).

In the formulas (XIV a), (XIV b) and (XV) W stand for the p-valent radical of a hydrazide HY of a carboxylic acid which has a melting point of at least 100 ⁰ C, in particular of at least 150 ⁰ C, after removal of p carboxylic acid hydrazide groups;

X for the q-valent radical of a hydrazide HY a sulfonic acid, which has a melting point of at least 100 ⁰ C, in particular of at least 150 ⁰ C, after removal of q Sulfonsäurehydrazidgruppen; m is zero or 1, p is 1 or 2 or 3 or 4, and q is 1 or 2 or 3 or 4. Preferably, p is 2.

The hydrazide HY is obtainable, for example, by the condensation of suitable carboxylic or sulfonic acids with hydrazine or hydrazine hydrate. Suitable carboxylic or sulfonic acid hydrazides having a melting point above 100 ^° C. are, for example, the following:

Hydrazides of aliphatic and arylaliphatic carboxylic acids, such as lauric acid, palmitic acid, stearic acid, cyanoacetic acid, 2,4-dichlorophenoxyacetic acid, 4-nitrophenoxyacetic acid, 1-naphthylacetic acid; Hydrazides of aromatic and heteroaromatic carboxylic acids such as benzoic acid, 2-, 3- and 4-chlorobenzoic acid, 2-, 3- and 4-bromobenzoic acid, 2- and 4-toluic acid, 2-, 3- and 4-nitrobenzoic acid, salicylic acid, 4- tert -butylbenzoic acid, 4-methoxybenzoic acid, 4-ethoxybenzoic acid, 4-trifluorobenzoic acid, 4-dimethylaminobenzoic acid, the isomeric dichlorobenzoic acids, dimethoxybenzoic acids and trimethoxybenzoic acids, monomethyl terephthalate, 1-naphthylcarboxylic acid, 3-hydroxy-2-naphthylcarboxylic acid. acid, 4-biphenylcarboxylic acid, nicotinic acid, isonicotinic acid, 2-thiophenecarboxylic acid, 4-imidazolecarboxylic acid, 3-pyrazolecarboxylic acid; Monohydrazines and dihydrazides of dicarboxylic acids such as oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, isophthalic acid, terephthalic acid; Mono-, di- and trihydrazides of tricarboxylic acids such as benzenetricarboxylic acid; the dihydrazide of carbonic acid (carbodihydrazide); Hydrazides of sulfonic acids such as benzenesulfonic acid, 4-toluenesulfonic acid; Dihydrazides of disulfonic acids such as propylene disulfonic acid, butylene disulfonic acid, o-, m- and p-benzenedisulfonic acid and naphthalenedisulfonic acid.

Also suitable as hydrazide HY are cyclic hydrazides of dicarboxylic acids which represent N-aminoimides, for example N-aminophthalimide, N-aminosuccinimide, 2-amino-3a, 4,7,7-tetrahydro-isoindole-1,3-dione, Amino-4-aza-tricyclo [5.2.1.0 ² ' ⁶ ] dec-8-ene-3,5-dione, 4-amino-4-aza-10-oxa-tricyclo [5.2.1.0 ² ' ⁶ ] decyl 8-en-3,5-dione.

Preferred hydrazides HY are carboxylic acid hydrazides.

As hydrazide HY, particular preference is given to carboxylic acid dihydrazides. Preferably, the carboxylic acid dihydrazide HY is selected from the

Group consisting of carbodihydrazide, oxalic dihydrazide, succinic dihydrazide, adipic dihydrazide, suberic dihydrazide, azelaic dihydrazide zid, sebacic dihydrazide, dodecanoic dihydrazide and isophthalic dihydrazide.

As hydrazide HY most preferred is adipic dihydrazide.

Hydrazide groups can in principle react both with isocyanate groups and with aldehyde and keto groups. In the reaction of carboxylic acid hydrazide groups with isocyanate groups, acylsemi- carbazide groups of the formula (XVI a) are formed, while in the reaction with aldehyde or keto groups with elimination of water, groups of the formula (XVII a) are formed. Sulfonic acid hydrazide groups form analogous groups of the formula (XVI b) and (XVII b).

The hydrazide HY is solid at room temperature and has a melting point of at least 100 ^° C., preferably of at least 150 ^° C. Its reactivity toward isocyanate groups and its reactivity toward aldehyde and keto groups is severely limited at temperatures well below its melting point. At room temperature, it reacts neither with isocyanate groups nor with aldehyde or keto groups to any significant extent. The hydrazide HY is storage-stable with isocyanate groups at room temperature or slightly elevated temperature. Only with stronger elevated temperature, especially at 80 ⁰ C and higher, find the reactions mentioned to a considerable extent.

The hydrazide HY is present in the curable composition in an amount of 0.3 to 1.1 equivalent hydrazide groups per equivalent of aldehyde and keto groups by which the amine BA is blocked. Preferably, the hydrazide HY is present in the curable composition in an amount of from 0.5 to 1.0 equivalent, more preferably from 0.75 to 1.0 equivalent of hydrazide groups per equivalent of aldehyde or keto groups by which the amine BA is blocked.

If the hydrazide HY is present in an amount smaller than 0.3 equivalent of hydrazide groups per equivalent of aldehyde and keto groups, by means of which the amine BA is blocked, the aldehyde or ketone outgassing is reduced only to a slight extent due to the stoichiometry. If the hydrazide HY is present in an amount greater than 1.1 equivalents of hydrazide groups per equivalent of aldehyde and keto groups by means of which the amine BA is blocked, then no additional reduction of the aldehyde or ketone outgassing is achieved. In order to obtain a maximum reduction of the aldehyde or ketone outgassing, the hydrazide HY is advantageously present in a stoichiometric or nearly stoichiometric amount relative to the aldehyde and keto groups by means of which the amine BA is blocked.

The curable composition may contain, in addition to at least one polyisocyanate P, at least one aldehyde or ketone-blocked amine BA and at least one hydrazide HY of a carboxylic or sulfonic acid further auxiliaries and additives.

The curable composition may be in the form of a one-part composition or in the form of a two-part composition.

As a "one-component composition" is referred to in this document, a curable composition whose components in mixed form can be stored in the same container, and which is storage stable at room temperature for a long period of time, ie not or only slightly changed by the storage in their application or use properties, and which cures after application by the action of moisture.

In the present document, a "two-component composition" refers to a curable composition whose constituents are present in two different components which are stored in separate containers and are each stable on their own, and only shortly before or during the application of the composition do the two components become intertwined is mixed, whereupon the mixed composition hardens, wherein the curing may take place or be completed only by the action of moisture.

One-component compositions have the advantage that they can be applied without mixing, while two-component compositions have the advantage that they can cure faster and as ingredients may contain substances which are not storable together with isocyanates.

In one embodiment, the curable composition is in the

Form of a one-component composition.

As the polyisocyanate P in the one-component composition, a polyurethane polymer PUP, or a mixture of a polyurethane polymer PUP and a polyisocyanate PI, as described above, is preferred.

A blocked amine BA in the one-component composition is an aldimine BA1 of the formula (Ia), in particular having a radical Z ^{1 of} the formula (II) or (III) or (IV), or an aldimine BA1 of the formula (Ib), or an oxazolidine BA4 of the formula (XI) is preferred. In the event that the blocked amine is opposite to the amine part

Isocyanate-reactive groups such as hydroxyl groups, mercapto groups or unblocked amino groups, their number per molecule is preferably one. Blocked amines BA with isocyanate-reactive Groups react on mixing with the polyisocyanate P by forming adducts.

However, the blocked amine BA preferably contains no isocyanate-reactive groups, such as hydroxyl groups, mercapto groups or unblocked amino groups.

As auxiliaries and additives for a one-component composition, for example, the following substances are suitable:

Plasticizers, for example carboxylic esters, such as phthalates, for example dioctyl phthalate, diisononyl phthalate or diisodecyl phthalate, adipates, for example dioctyl adipate, azelates and sebacates, organic phosphoric and sulfonic acid esters or polybutenes;

non-reactive thermoplastic polymers, for example homopolymers or copolymers of unsaturated monomers, in particular from the group comprising ethylene, propylene, butylene, isobutylene, isoprene, vinyl acetate and alkyl (meth) acrylates, in particular polyethylenes (PE), polypropylenes (PP) , Polyisobutylenes, ethylene-vinyl acetate copolymers (EVA) and atactic poly-α-olefins (APAO);

- solvents;

inorganic and organic fillers, for example ground or precipitated calcium carbonates, which are optionally coated with fatty acids, in particular stearates, baryta (BaSO ₄ , also called barite), quartz flours, calcined kaolins, aluminum oxides, aluminum hydroxides, silicic acids, in particular finely divided silicas from pyrolysis processes , Russian, in particular industrially produced Russian (hereinafter referred to as "soot"), PVC powder or hollow spheres;

Fibers, such as polyethylene;

Pigments, for example titanium dioxide or iron oxides;

Catalysts which accelerate the hydrolysis of the blocked amino groups, in particular acids or compounds hydrolyzable to acids, for example organic carboxylic acids such as benzoic acid, salicylic acid or 2-nitrobenzoic acid, organic carboxylic anhydrides such as phthalic anhydride, hexahydrophthalic anhydride and hexahydromethyl phthalic anhydride, silyl esters of organic carboxylic acids, organic Sulfonic acids such as methanesulfonic acid, p-toluenesulfonic acid or 4-dodecylbenzenesulfonic acid, sulfonic acid esters, other organic or inorganic acids, or mixtures of the abovementioned acids and acid esters;

Catalysts which accelerate the reaction of the isocyanate groups with water, in particular metal compounds, for example organotin compounds such as dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dichloride, dibutyltin diacetylacetonate and dioctyltin dilaurate, bismuth compounds such as bismuth trioctoate and bismuth tris (neodecanoate), and compounds containing tertiary amino groups such as 2,2 '-Dimorpholinodiethyl ether and 1,4-diazabicyclo [2.2.2] octane;

Rheology modifiers such as thickeners or thixotropic agents, for example urea compounds, polyamide waxes, bentonites or pyrogenic silicas;

Reactive diluents and crosslinkers, for example monomeric diisocyanates and oligomers and derivatives of these diisocyanates, adducts monomeric

Diisocyanates with short-chain polyols;

Drying agents, such as, for example, molecular sieves, calcium oxide, highly reactive isocyanates, such as p-tosyl isocyanate, orthoformic acid esters, tetraalkoxysilanes, such as tetraethoxysilane; Trialkoxysilanes such as methyltrimethoxysilane, isooctyltrimethoxysilane and vinyltrimethoxysilane;

Adhesion promoters, in particular organoalkoxysilanes, also referred to below as "silanes", for example epoxysilanes, such as 3-glycidoxypropyltrimethoxysilane and 3-glycidoxypropyltriethoxysilane, (meth) acrylsilanes, such as 3-methacryloxypropyltrimethoxysilane, isocyanatosilanes, such as 3-isocyanatopropyltrimethoxysilane, S- (alkylcarbonyl ) mercaptosilanes, such as S-octanoyl-3-mercaptopropyltriethoxysilane, and aldimino silanes, such as N-benzylidene-3-aminopropyltrimethoxysilane, and oligomeric forms of these silanes;

- stabilizers against heat, light and UV radiation;

- flame-retardant substances; - Surface-active substances such as wetting agents, leveling agents, deaerators or defoamers;

- Biocides such as algicides, fungicides or fungal growth inhibiting substances. It is advantageous to ensure that such additives do not affect the storage stability of the composition. This means that during storage these additives are not allowed to trigger the reactions leading to crosslinking, such as hydrolysis of the blocked amino groups or crosslinking of the isocyanate groups, to any significant extent. In particular, this means that all of these additives should contain no or at most traces of water. It may therefore be useful to chemically or physically dry certain additives before mixing in the composition. Preferably, the one-component composition contains at least one catalyst. In particular, the composition contains as catalyst a carboxylic acid such as benzoic acid or salicylic acid and / or a tin compound and / or a bismuth compound. It may be advantageous if different catalysts or different types of catalysts, such as, for example, an acid and a metal compound, are mixed with one another.

Further preferably, the one-component composition contains at least one further auxiliary and additive, in particular selected from the group comprising plasticizers, fillers and thickeners.

The one-component composition described is preferably prepared in the absence of moisture and stored at room temperature or slightly elevated temperature. In a suitable climate-proof packaging or arrangement, such as a keg, a bag or a cartridge, it has a good storage stability. The terms "storage-stable" and "storage stability" in the context of a curable composition in this document refers to the fact that the viscosity of the composition does not increase or at most rises so much at a given application temperature and with suitable storage during the time considered that the composition remains usable in the intended manner. In another embodiment, the curable composition is in the form of a bicomponent composition. The two-component composition consists of a component K1 and a component K2, which are stored separately from each other and mixed together shortly before application.

In one embodiment of the two-component composition, the polyisocyanate P and the blocked amine BA are part of the component K1, while the component K2 contains isocyanate-reactive compounds, especially water and / or polyols and / or polyamines and / or amino alcohols and / or polythiols, and the hydrazide HY is contained either in the component K1 or in the component K2 or in both components.

In another embodiment of the two-component composition, the polyisocyanate P is part of component K1, while component K2 contains the blocked amine BA and isocyanate-reactive compounds, especially water and / or polyols and / or polyamines and / or amino alcohols and / or polythiols and the hydrazide HY is contained either in the component K1 or in the component K2 or in both components. Preferably, the component K2 contains at least one blocked amine

BA and water.

Preferably, the hydrazide HY is a component of the component K2.

As the polyisocyanate P in the two-component composition, a polyisocyanate PI, or a mixture of a polyurethane polymer PUP and a polyisocyanate PI, as described above, are preferred.

Suitable polyols in component K2 are the same commercial polyols as have already been mentioned as suitable for the preparation of a polyurethane polymer PUP, as well as those low molecular weight dihydric or polyhydric alcohols, such as previously suitable for use in the preparation of a polyurethane polymer PUP were mentioned. Suitable polyamines in component K2 are commercially available aliphatic or aromatic polyamines having primary and / or secondary amino groups, such as are commonly used in two-component polyurethane compositions, such as, for example, 1, 5-diamino-2-methylpentane (MPMD), 1, 3-xylylenediamine (MXDA), N, N'-dibutylethylenediamine, 3,5-diethyl-2,4 (6) -diaminotoluene (DETDA), 3,5-dimethylthio-2,4 (6) -diaminotoluene (available, for example, as Ethacure ^® 300 from Albemarle) and primary and secondary polyoxyalkylene-diamines, such as are obtainable for example under the name Jeffamine ^® (from Huntsman). Suitable amino alcohols in component K2 are compounds which have at least one primary or secondary amino group and at least one hydroxyl group, for example 2-aminoethanol, 2-methyl-aminoethanol, 1-amino-2-propanol and diethanolamine. Suitable polythiols in component K2 are for example those known under the trade name Thiokol ^® liquid mercapto-terminated polymers, and polyesters of thiocarboxylic acids.

In addition, both components may contain other auxiliaries and additives, as already mentioned above for a one-component composition. In the case of component K2, however, additional auxiliaries and additives are additionally possible. In particular, these are those auxiliaries and additives which are not or only briefly storable together with aromatic isocyanate groups. In particular, these are catalysts such as:

Compounds of zinc, manganese, iron, chromium, cobalt, copper, nickel, molybdenum, lead, cadmium, mercury, antimony, vanadium, titanium, zirconium or potassium, such as zinc (II) acetate, zinc (II) 2-ethylhexanoate , Zinc (II) laurate, zinc (II) oleate, zinc (II) naphthenate, zinc (II) acetylacetonate, zinc (II) salicylate, manganese (II) 2-ethylhexanoate, iron (III ) -2-ethylhexanoate, iron (III) acetylacetonate, chromium (III) -2-ethylhexanoate, cobalt (II) naphthenate, cobalt (II) -2-ethylhexanoate, copper (II) 2-ethylhexanoate , Nickel (II) naphthenate, phenylmercuric neodecanoate, lead (II) acetate, lead (II) 2-ethylhexanoate, lead (II) neodecanoate, lead (II) acetylacetonate, aluminum lactate, aluminum oleate, Aluminum (III) acetylacetonate, diisopropoxy titanium bis (ethylacetoacetate), dibutoxy titanium bis- (ethylacetoacetate), dibutoxytitanium bis (acetylacetonate), potassium acetate, potassium octoate; tertiary amines such as triethylamine, tributylamine, N-ethyl-diisopropylamine, N, N, N ', N'-tetramethyl-ethylenediamine, pentamethyl-diethylenetriamine and higher homologues thereof, N, N, N', N'-tetramethyl-propylenediamine, pentamethyl -dipropylenetriamine and higher homologues thereof, N, N, N ', N'-tetramethyl-1,3-butanediamine, N, N, N', N'-tetramethyl-1,6-hexanediamine, bis ( dimethylamino) methane, N, N-dimethylbenzylamine, N, N-dimethylcyclohexylamine, N-methyl-dicyclohexylamine, N, N-dimethyl-hexadecylamine, BiS- (N, N-diethylaminoethyl) adipate, N, N-dimethyl -2-phenylethylamine, tris- (3-dimethylaminopropyl) -amine, 1,4-diazabicyclo [2.2.2] octane (DABCO), 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU) , 1, 5-diazabicyclo [4.3.0] non-5-ene (DBN), N-methylmorpholine, N-ethylmorpholine, N-cocomorpholine, N, N'-dimethylpiperazine, N-methyl-N'-dimethylaminoethyl-pipe- Razin, bis (dimethylaminoethyl) piperazine, 1,3,5-tris (dimethylaminopropyl) hexahydrotriazine, bis (2-dimethylaminoethyl) ether; nitrogen aromatic compounds such as 4-dimethylaminopyridine, N-methylimidazole, N-vinylimidazole or 1,2-dimethylimidazole; Amidines and guanidines such as 1,1,3,3-tetramethylguanidine; tertiary amines containing active hydrogen atoms, such as triethanolamine, triisopropanolamine, N-methyldiethanolamine, N, N-dimethylethanolamine, 3- (dimethylamino) -propyl-diisopropanolamine, bis (3- (dimethylamino) -propyl) -isopropanolamine, bis ( 3-dimethylaminopropyl) amine, 3- (dimethylamino) -propylurea, Mannich bases such as 2,4,6-tris (dimethylaminomethyl) phenol or 2,4,6-tris (3- (dimethylamino) propylaminomethyl ) -phenol, N-hydroxypropylimidazole, N- (3-aminopropyl) -imidazole, as well as alkoxylation and polyalkoxylation products of these compounds, for example dimethylaminoethoxyethanol; organic ammonium compounds such as benzyltrimethylammonium hydroxide or alkoxylated tertiary amines; so-called "delayed action" catalysts which are modifications of known metal or amine catalysts, such as reaction products of tertiary amines and carboxylic acids or phenols, for example of 1,4-diazabicyclo [2.2.2] octane or DBU and formic acid or acetic acid; Combinations of said compounds, in particular of metal compounds and tertiary amines.

Preferably, the two-component composition contains at least one catalyst. In particular, the composition contains as Catalyst a carboxylic acid such as benzoic acid or salicylic acid and / or a tin compound and / or a bismuth compound. It may be advantageous if different catalysts, or different types of catalysts, such as an acid and a metal compound, are mixed together.

Further preferably, the two-component composition contains at least one further auxiliary and additive, in particular selected from the group comprising plasticizers, crosslinkers, fillers and thickeners. The component K2 preferably contains no isocyanate groups.

The preparation of the described components K1 and K2 is carried out separately from each other, at least for the component K1 in the absence of moisture. The two components K1 and K2 are storage-stable separately from one another at room temperature or slightly elevated temperature, i. they may each be stored in a suitable packaging or arrangement, such as a keg, hobbock, pouch, bucket or cartridge, for several months to a year and longer before being used, without being in their respective ones Change properties to a degree that is relevant to their use.

The mixing ratio between the components K1 and K2 is preferably selected such that the isocyanate-reactive groups of the components K1 and K2 are in a suitable ratio to the isocyanate groups of the component K1. In the described two-component composition, 0.1 to 1.1, preferably 0.5 to 0.95, particularly preferably 0.6 to 0.95 equivalent of the sum of the isocyanate-reactive groups per equivalent of isocyanate groups are present before curing, the blocked amino groups being counted among the isocyanate-reactive groups and water is not expected to be isocyanate-reactive groups. Excess isocyanate groups react in particular directly with water, for example with atmospheric moisture. The described curable composition is suitably applied at a temperature below 40 ^° C. It is clear to the person skilled in the art that the application temperature of the composition is advantageously well below the melting point of the hydrazide HY present in order to avoid a premature reaction of the hydrazide HY with the isocyanate groups present. The application is carried out by contacting the composition with a solid surface, optionally by means of a suitable auxiliary agent. If the composition is in pasty form, the application can be carried out, for example, from commercially available cartridges, which are preferably operated manually for smaller applications. An application by means of compressed air from a cartridge or from a barrel or hobbock by means of a feed pump or an extruder, optionally by means of an application robot, is also possible. Such types of application are particularly preferred in industrial manufacturing applications or in large applications. In the case of a two-component composition, components K1 and K2 are mixed together before or during application by a suitable method. The mixing can be continuous or batchwise. If mixing takes place before application, care must be taken that there is not too much time between blending components K1 and K2 and the application, as this can lead to disturbances, such as a slow or incomplete buildup of adhesion to the solid surface ,

During and after the application, the curing of the

Composition. The curable composition reacts with water or moisture and is thereby crosslinked. If enough water is present to react most or all of the isocyanate groups, a cured composition results which has good mechanical properties. The composition may therefore be termed "moisture-curing." Suitably, this process, also referred to as "curing" or "crosslinking," takes place at room temperature or slightly elevated temperature, in particular below 40 ^° C. The blocked amine BA begins to react with existing isocyanate groups to release aldehydes and / or ketones as soon as it comes into contact with water. Existing aldimino groups can hydrolyze upon access of moisture, or water, via intermediates to primary amino groups, the corresponding aldehyde is released. Since this hydrolysis reaction is reversible and the chemical equilibrium lies clearly on the aldimine side, it can be assumed that in the absence of amine-reactive groups only a part of the aldimino groups hydrolyzes. In the presence of isocyanate groups, the hydrolysis equilibrium shifts, since the hydrolyzing aldimino groups react irreversibly with the isocyanate groups to form urea groups. The reaction of the hydrolyzing aldimino groups with isocyanate groups does not necessarily have to take place via free amino groups. Of course, reactions with intermediates of the hydrolysis reaction are possible. For example, it is conceivable that a hydrolyzing aldimino group in the form of a semiaminal group reacts directly with an isocyanate group. Existing ketimino groups may hydrolyze via intermediates to primary amino groups on entry of moisture, liberating the corresponding ketone. In the presence of isocyanate groups also urea groups are formed. Also present Enaminogruppen react upon access of moisture to release the corresponding aldehyde or ketone with isocyanate groups to urea groups. In the hydrolysis of existing oxazolidino groups formally release a aldehyde or ketone per oxazolidino group a secondary amino group and a hydroxyl group. In the presence of isocyanate groups, the secondary amino groups react to urea groups and the hydroxyl groups to urethane groups. Oxazolidinogruppen are thus formally difunctional in their hydrolysis to isocyanate groups. The water needed to cure the composition is either already present in the applied composition, for example - in the case of a two-part composition - being a component of component K2 or by adding it to the composition shortly before or during application, or the water diffuses into the composition in the form of atmospheric moisture. In the latter case, the reaction of the blocked amine BA with the isocyanate groups takes place from the outside inwards, parallel to the penetration of the atmospheric moisture into the composition. In the case of a two-component composition which has hydroxyl, mercapto or primary or secondary amino groups, these also react with the isocyanate groups present. Excess isocyanate groups react in particular directly with water. As a result of these reactions, the mixed composition cross-links and eventually hardens to a solid material.

The curing is generally free of bubbles, especially at high curing rate.

The curing rate can be influenced by the type and amount of one or more optionally present catalysts and / or by the air humidity or, if appropriate, by the amount of water introduced via a component K2.

Suitably, the curing is carried out at room temperature or slightly elevated temperature, in particular below 40 ⁰ C. The hydrazide HY does not react at these conditions due to its high melting point to any significant extent with isocyanates, but remains largely unreacted in the cured composition.

In the event that are released from the blocked amine BA in the curing of the composition relatively low volatility aldehydes or ketones, in particular the odorless aldehydes ALD2 of the formula (VI b), or ALD3 of the formula (VI c), with the radicals R ⁴ or R ⁵ with 11 or more carbon atoms, they remain in the conditions mentioned after curing also largely in the composition.

When the cured composition is heated, in particular to 80 ^° C. and higher, the hydrazide HY begins to react with the aldehydes and / or ketones present, in particular with the aldehydes and / or ketones liberated in the hydrolysis of the blocked amine BA. The resulting in the reaction between hydrazides and aldehydes or ketones Condensation products, also called hydrazones, are referred to in the present document as "aldazides" or as "ketazides".

The heating of the cured composition can be carried out, for example, in the course of normal use of the cured composition, for example, by an automobile whose windshield is bonded by means of the described composition is strongly heated by solar radiation.

However, the heating of the cured composition can also be brought about deliberately by, for example, the abovementioned automobile - or an attachment thereof containing the glued windshield - specifically heated to 80 ⁰ C, for example, so that existing aldehydes and / or ketones react with the hydrazide HY. Thus, the targeted heating can represent a process step in the manufacturing process.

The described curable composition hardly differs in its curing behavior and the mechanical properties of suitable compositions without hydrazide HY at a suitable application and curing temperature. The isocyanate groups react, as already described, with the hydrolyzing blocked amino groups of the blocked amine BA and optionally present hydroxyl groups, mercapto groups and unblocked amino groups, and finally with water, while the hydrazide HY due to its high melting point not to a significant extent at the Curing reaction participates. In the cured state, however, the curable composition described has a significantly reduced outgassing, especially at elevated temperature. Emissions caused by the outgassing of aldehydes or ketones can be disruptive, especially indoors, for example by causing an unpleasant odor, or by causing irritation to the skin or respiratory tract, or by forming fittings on surfaces. In vehicles, such fittings can lead to clouding of the discs, which is also referred to as "fogging" (and as described in DIN 75201 determined can be). In the automotive industry in particular, there are often limits for the materials used in the vehicle interior, for example adhesives, volatiles escaping through outgassing.

When the cured composition is heated, in particular to 80 ^° C. and higher, the hydrazide begins to react with the aldehydes and / or ketones liberated in the hydrolysis of the blocked amine BA.

The aldazides or ketazides formed in this case are low volatility enough not to outgas even at higher temperatures.

Thus, the hydrazide HY described can be used to reduce the aldehyde or ketone outgassing from the cured composition.

The preferred aldimines BA1 of the formula (Ia), in which Z ^{1 is} a radical of the formula (II) or (III) or (IV), set in the curing reaction relatively low-volatility aldehydes ALD 2 of the formula (VI b) or ALD 3 of Formula (VI c) or ALD4 of the formula (VI d) free. In particular, the particularly preferred odorless aldehydes ALD2 or ALD3, in which R ⁴ in formula (VI b) or R ⁵ in formula (VI c) have 11 to 30 carbon atoms, remain in the room for a very long time due to their low volatility at room temperature cured composition. In the absence of a hydrazide HY, such aldehydes escape at elevated temperature, especially at temperatures of 80 ^° C. and higher, but gradually from the cured composition. In contrast, in the presence of a hydrazide HY, such aldehydes can still be effectively bound when the composition is heated, even if it takes place for a very long time after curing. The outgassing of such aldehydes from the compositions described is greatly reduced by the extremely low volatility of the corresponding aldazides even at significantly elevated temperatures, for example at 100 ⁰ C or more; this is associated with a significantly reduced weight loss of the composition. An almost stoichiometric content of hydrazide groups relative to aldehyde and keying groups causes a particularly significant reduction in the weight loss of the cured composition. The hydrazide HY has, as already mentioned, a melting point of at least 100 ⁰ C, in particular of at least 150 ⁰ C, on. Too low a melting point of the hydrazide used can result in premature reaction with isocyanate groups, which can lead to incomplete curing of the composition and / or inadequate storage stability of the hydrazide together with isocyanate groups. The storage stability of a one-component composition is related to the melting point of the hydrazide present. While a one-component composition containing benzhydrazide having a melting point of about 112 ⁰ C at room temperature or at most slightly elevated temperature is storage stable, has a corresponding composition containing adipic dihydrazide having a melting point of about 180 ° C even at a storage temperature of 60 ⁰ C an excellent Storage stability. A one-component composition containing, for example, acetic acid hydrazide having a melting point of about 63 ^° C., ie below 100 ^° C., is not storage-stable even at room temperature.

A curable composition which, in addition to at least one polyisocyanate P, as hydrazide HY the particular preferred adipic dihydrazide in the amount already mentioned, and as a blocked amine BA an aldimine BA1 of the formula (I a) with Z ^{1 of} the formula (II) or (III) with radicals R ⁴ or R ⁵ having 11 to 30 carbon atoms, has particularly advantageous properties. It has a very good storage stability, cures at room temperature or slightly elevated temperature quickly and odor-free and has in the cured state good mechanical properties. At elevated temperature, it shows a surprisingly low aldehyde outgassing; their weight loss at 80 ^° C. is very low compared to that of a corresponding composition without hydrazide HY.

Furthermore, it has been found that the described curable composition, especially when containing aromatic isocyanate groups or reaction products thereof, exhibits a markedly reduced tendency to yellowing compared with corresponding compositions without Hydrazide HY. The reduced yellowing tendency is particularly evident in the cured composition, especially when it is heated for a few hours or days, for example to temperatures of 80 to 130 ⁰ C. Thus, a described hydrazide HY or Aldazid thereof for reducing the yellowing of a cured Polyurethane composition can be used.

Preferred applications of the curable composition described, in particular of the preferred embodiments thereof, are adhesives, sealants, potting compounds, coatings, floor coverings, paints, lacquers, primers or foams.

With their low outgassing behavior, the curable compositions described are particularly suitable as one-component or two-component elastic adhesives in vehicle construction, in particular as

Window adhesives, where regarding outgassing, or fogging, high

Requirements are placed on the materials used.

With their lower yellowing tendency, the curable compositions described are furthermore particularly suitable as one-component or two-component floor coverings.

A further aspect of the present invention relates to a method for bonding a substrate S1 to a substrate S2, which comprises the steps of: i) applying a previously described curable composition to a substrate S1 at a temperature below 40 ^° C.; ii) contacting the applied composition with a substrate S2 within the open time of the composition; iii) curing the applied composition in a

Temperature below 40 ⁰ C; or i ') application of a previously described curable composition to a substrate S1 and to a substrate S2 at a temperature below 40 ⁰ C; ii ') contacting the applied composition with each other within the open time of the composition; iii ') curing the applied composition in a

Temperature below 40 ⁰ C; wherein the substrate S2 is made of the same or a different material as the substrate S1.

Another aspect of the present invention relates to a method of sealing. This comprises the following steps: i) application of a previously described curable composition at a temperature below 40 ^° C. between a substrate S1 and a substrate S2 such that the composition is in contact with the substrate S1 and the substrate S2; Curing the applied composition in a

Temperature below 40 ⁰ C; wherein the substrate S2 is made of the same or a different material as the substrate S1.

Usually, the composition is pressed into a so-called joint.

Another aspect of the present invention relates to a method of coating a substrate S1. This comprises the steps: i '") application of a previously described curable composition at a temperature below 40 ^° C. to a substrate S1 within the open time of the composition; ii'") hardening of the applied composition at a temperature below 40 ^° C.

In these three methods, suitable substrates S1 and / or S2 are, for example, inorganic substrates such as glass, glass-ceramic, concrete, mortar, Brick, brick, plaster and natural stones such as granite or marble; Metals or alloys such as aluminum, steel, non-ferrous metals, galvanized metals; organic substrates such as leather, fabrics, paper, wood, resin-bonded wood materials, resin-Texil composites, plastics such as polyvinyl chloride (hard and soft PVC), acrylonitrile-butadiene-styrene copolymers (ABS), SMC (Sheet Molding Composites ), Polycarbonate (PC), polyamide (PA), polyesters, PMMA, polyesters, epoxy resins, polyurethanes (PUR), polyoxymethylene (POM), polyolefins (PO), in particular plasma-corona or flame-treated polyethylene (PE) or polypropylene ( PP), ethylene / propylene copolymers (EPM) and ethylene / propylene-diene terpolymers (EPDM); coated substrates such as powder-coated metals or alloys; as well as paints and varnishes, in particular automotive paints.

If necessary, the substrates can be pretreated before applying the composition. Such pretreatments include, in particular, physical and / or chemical cleaning methods, for example grinding, sandblasting, brushing or the like, or treatment with cleaners or solvents or the application of an adhesion promoter, a primer solution or a primer.

In the case of a two-component composition, the two components K1 and K2 are mixed together shortly before application.

From the described methods for bonding, sealing or coating - or from the use of one of the curable compositions described as an adhesive, sealant, potting compound, coating, flooring, paint, paint, primer or foam - creates an article.

This article is in particular a building, in particular a building of civil engineering, or an industrial good or a consumer good, in particular a window, a household machine, or a means of transport, in particular a vehicle on water or on land, preferably an automobile, a bus , a truck, a train or a ship, or an attachment of a means of transport, or an article of the furniture, textile or packaging industry.

Another object of the present invention is a cured composition AZ, obtained by the curing of the previously described curable composition at a temperature below 40 ⁰ C by the action of water, for example in the

Form of humidity, and then heating the thus obtained cured composition to a temperature of 80 ⁰ C or higher, said cured composition at least one compound of the

Contains formula (XVIII a) or (XVIII b) or (XIX),

(XVIII a)

(XVIII b)

wherein Q ^{1 is} a hydrogen atom or Z ³ or Z ⁵ or Z ⁸ , wherein if Q ^{1 is} a hydrogen atom, Q ^{2 is} Y, or if Q ^{1 is} Z ³ , Q ^{2 is} Z ⁴ , or

if Q ^{1 is} Z ⁵ , Q ^{2 is} or if Q ^{1 is} Z ⁸ , Q ^{2 is} Z ⁹ . W, X, m, p, q, Y, Z ³ , Z ⁴ , Z ⁵ , Z ⁵ , Z ⁶ , Z ⁷ , Z ⁸ and Z ⁹ have the meanings already described.

The compounds of the formula (XVIII a), (XVIII b) and (XIX) are aldazides or ketazides of carboxylic or sulfonic acid hydrazides. The compounds of the formula (XVIII a) and (XVIII b) are formed by the reaction of a hydrazide HY in the form of a carboxylic acid hydrazide with an aldehyde or ketone, while the compound of formula (XIX) is formed by the reaction of a hydrazide HY in the form of a sulfonic acid hydrazide with an aldehyde or ketone, and wherein the aldehyde or ketone precipitates upon curing of the composition the blocked amine BA was released.

Preferably, the cured composition AZ contains a

Compound of formula (XVIII a) or (XVIII b). Particularly preferred is the

Compound of formula (XVIII a) or (XVIII b) formed from the reaction of a Carbonsäuredihydrazids with an aldehyde or ketone, wherein the

Carboxylic acid dihydrazide is preferably selected from the group consisting of carbodihydrazide, oxalic dihydrazide, succinic dihydrazide, adipic acid dihydrazide, suberic dihydrazide, azelaic dihydrazide, sebacic dihydrazide, dodecanoic dihydrazide and isophthalic dihydrazide. Of these, most preferred is adipic dihydrazide.

Q ¹ is preferably a hydrogen atom and Q ^{2 is} -C (R ¹ ) (R ² ) (Z ¹ ), where Z ^{1 is,} in particular, a radical of the formula (II) or (III) or (IV).

Another object of the present invention is an aldazide of the formula (XX a) or (XX b),

in which

W ^{1 represents} the p'-valent radical of a hydrazide HY of a carboxylic acid which has a melting point of at least 100 ^° C., in particular of at least 150 ^° C., after removal of p 'carboxylic acid hydrazide groups; p 'is 2 or 3 or 4; and m, R ¹ , R ² and Z ^{1 have} the meanings already mentioned.

Preferably, p 'is 2.

Z ¹ is preferably a radical of the formula (II) or (III) or (IV).

Examples

Description of the measuring methods

Infrared spectra were measured on a Perkin-Elmer 1600 FT-IR instrument, solids as KBr compacts in direct jet, liquids as undiluted films, and cured polymers as pressed films on a ZnSe crystal horizontal ATR measuring unit; the absorption bands are given in wavenumbers (crrf ¹ ) (measurement window: 4000-650 cm ^-1 ); the suffix sh indicates a band appearing as a shoulder, the suffix br on a broad band.

¹ H NMR spectra were measured on a Bruker DPX-300 spectrometer at 300.13 MHz; the chemical shifts δ are given in ppm relative to tetramethylsilane (TMS), coupling constants J are given in Hz. True and pseudo-coupling patterns were not distinguished.

The viscosity was measured on a thermostatically controlled cone-plate viscometer Physica UM (cone diameter 20 mm, cone angle 1 °, cone peak-to-plate distance 0.05 mm, shear rate 0 to 1000 s ^-1 ).

The amine content, ie the total content of free amino groups and blocked amino groups (aldimino groups) in the compounds prepared, was determined titrimetrically (with 0.1 N HClO ₄ in glacial acetic acid, against crystal violet) and is always given in mmol N / g. As a standard climate at a temperature of 23 ± 1 ⁰ C at a relative humidity of 50 ± 5% is referred to.

Preparation of aldimines aldimine Λ-7

23.0 g (0.22 mol) of benzaldehyde were placed in a round bottom flask under a nitrogen atmosphere. With vigorous stirring, 25.0 g (0:21 mol N) polyetherdiamine from a dropping funnel was added slowly (polyoxypropylene diamine having an average molecular weight of about 240 g / mol; 8.29 mmol N / g amine content; Jeffamine ^® D-230 Huntsman). Thereafter, at 80 ⁰ C, the volatiles were removed in vacuo (10 mbar, 80 ⁰ C). Yield: 44.0 g of a yellowish, liquid at room temperature oil with an amine content of 4.72 mmol N / g.

Aldimine A-2 74.3 g (0.26 mol) of distilled 2,2-dimethyl-3-lauroyloxypropanal were placed in a round bottom flask under a nitrogen atmosphere. Was added slowly with vigorous stirring (; Jeffamine ^® D-230, Huntsman 8.29 mmol N / g amine content polyoxypropylene diamine having an average molecular weight of about 240 g / mol) from a dropping funnel 30.0 g (0:25 mol N) polyether diamine. Thereafter, the volatiles were removed in vacuo (10 mbar, 80 ⁰ C). Yield: 99.5 g of a clear, pale yellow oil with an amine content of 2.50 mmol N / g.

Aldimine A-3 52.4 g (0.18 mol) of distilled 2,2-dimethyl-3-lauroyloxypropanal were placed in a round bottom flask under a nitrogen atmosphere. With vigorous stirring, 10.0 g (0.17 mol N) of 1,6-hexamethylenediamine (BASF, amine content 17.0 mmol N / g) were slowly added from a heated dropping funnel. Thereafter, the volatiles were removed in vacuo (10 mbar, 80 ° C). Yield: 57.7 g of a clear, pale yellow oil with an amine content of 2.85 mmol N / g. Preparation of Aldazides Example 1

In a round bottom flask under a nitrogen atmosphere 5.00 g (0.029 mol) of finely ground adipic dihydrazide (melting point 180- 182 ⁰ C) in 17.96 g (0.063 mol) of 2,2-dimethyl-3-lauroyloxy-propanal and 50 ml of abs. Ethanol suspended. The suspension was heated with vigorous stirring to 90-95 ⁰ C and thereby slightly evacuated. Thereafter, the volatiles were completely removed by further warming to 120 ⁰ C and applying a vacuum (5-10 ^{~ 2} mbar). Yield: 21.8 g of an opalescent, colorless and odorless oil that crystallized on standing at room temperature within a few hours to a white body. Melting point (un corrected): 62-63 ⁰ C.

IR: 3203w br (v _NH ), 3073w br (v _NH ), 2954m sh, 2921s, 2869m sh, 2852s, 1738s (v _O c = o), 1672vs br (V _C = N), 1630m (v _N c = o), 1553w br (5 _N- H), 1485W sh, 1465m, 1439m sh, 1393m, 1376m, 1365m sh, 1347w, 1298m sh, 1282m, 1248m, 1233m, 1159s, 1112s, 1075w, 1059w, 1018m, 1002m, 933m, 887w sh, 865w, 797w, 740m sh, 721.

¹ H-NMR (CDCl ₃ , 300 K): δ 9.35 (s, 2H, = N-NH-CO), 7.05 (s, 2H, CH = N), 4.00 (s, 4H, C (CHg ) ₂ -CH ₂ -O), 2.64 (t, J «6.8, 4 H, NHC (O) -CH ₂ -CH ₂ ), 2.31 (t, J« 7.5, 4 H, OC (O) -CH ₂ -CH ₂ ), 1.74 {t, J «7.0, 4 H, NHC (O) -CH ₂ -CH ₂ ), 1.61 (m, 4 H, OC (O) -CH ₂ -CH ₂ ), 1.25 (m , 32 H, CH ₃ - (CH ₂ ) ₈ -CH ₂ -CH ₂ -CO), 1.14 (s, 12 H, C (CHg) ₂ -CH ₂ -O), 0.88 {t, J «6.8, 6 H, CH ₃ - (CH ₂₎ i -CO _0).

Example 2 In a round bottomed flask under a nitrogen atmosphere 1.00 g

(11.1 mmol) finely ground carbohydrazide (= carbodihydrazide, melting point 150-153 ⁰ C) in 6.63 g (23.3 mmol) of 2,2-dimethyl-3-lauroyloxy-propanal suspended. The suspension was heated with vigorous stirring to 70 ⁰ C and simultaneously evacuated in a high vacuum (5-10 ^{~ 2} mbar). The result was a clear, colorless oil, which suddenly solidified into a white body. After Zermörserung and renewed evacuation in a high vacuum at 70 ⁰ C to give 7.19 g of product as a white, odorless powder. Melting point (un corrected): 85-87 ⁰ C. IR: 319Ow br (v _NH ), 3086w br (v _NH ), 2948m sh, 2914s, 2868m sh, 2848s, 1730vs (voc = o), 1686vs (V _C = N), 1548S (V _NC = O), 1470m , 143Ow, 1418w, 1396w, 1384w, 1366m, 135Ow, 1326w, 1312w, 1299w, 1284w, 1258m, 1236m, 1214w sh, 1206m, 1178s, 1140m, 1106s, 1076w, 106Ow, 1051w, 1028m, 100Om, 972w, 930m, 875w, 831 vw, 81Ow, 79Ow, 775vw, 746m, 728m sh, 718m, 664w.

From Examples 1 and 2 it can be seen that the aldehyde reacts 2,2-dimethyl-3-lauroyloxy-propanal with a respective Carbonsäurehydrazid having a melting point of at least 100 ⁰ C at elevated temperature with high conversion to the corresponding aldazide.

Used hvdrazides

Hydrazide HY-1. Adipic melting point 180-182 ⁰ C.

Hydrazide HY-2. Benzhydrazide melting point 112-114 ⁰ C.

Hydrazide HY-3. 2-thiophene carboxylic acid hydrazide melting point 136-139 ⁰ C.

Preparation of Polyurethane Compositions Examples 3 to 7 and Comparative Examples 8 to 9

In a screw cap polypropylene cup, polymer P-1, whose preparation is described below, was prepared using a centrifugal mixer (Speed Mixer ™ DAC 150, FlackTek Inc, 1 min at 2500 rpm) with the ingredients listed in Table 1 the specified parts by weight mixed to a homogeneous mass.

Polymer P-1 was prepared as follows:

1300 g of polyoxypropylene diol (Acclaim ^® 4200 N, Bayer; OH number 28.5 mg KOH / g), 2600 g of polyoxypropylene polyoxyethylene triol (Caradol ^® MD34-02, Shell; OH number 35.0 mg KOH / g), 600 g 4 , 4'-methylene diphenyl diisocyanate (4,4'-MDI; Desmo- dur ^® 44 MC L, Bayer) and 500 g of diisodecyl phthalate (DIDP; Palatinol ^® Z, BASF) were reacted at 80 ⁰ C to give an NCO-terminated polyurethane polymer containing reacted at free isocyanate groups of 2.05% by weight.

Table 1: Composition of Examples 3 to 7 and Comparative Examples 8 to 9. ^a 5 wt .-% salicylic acid in dioctyl adipate. ^b 2,2'-Dimorpholinodi- ether (DABCO ^® DMDEE Catalyst, Air Products). ^c ratio between aldimino groups and isocyanate groups. ^d ratio between hydrazide groups and aldimino groups.

The compositions thus obtained were tested for viscosity, storage stability, skinning time, blistering, mechanical properties, outgassing loss and degree of gassing of the aldehyde.

Storage stability was determined by the change (increase) in viscosity during storage in the heat. For this purpose, the composition was stored in the sealed tube in the oven at 60 ⁰ C and measured the viscosity at 20 ⁰ C a first time after 6 hours and a second time after 7 days of storage. The storage stability results from the percentage increase of the second viscosity value compared to the first.

To measure the skin formation time (time to freedom from tack, "tack free time") a few grams of the stored during 6 hours at 60 ⁰ C, room-temperature warm composition in a layer thickness of approximately 2 mm were applied to cardboard, and the time under standard conditions, It took until the slightest tap of the surface of the composition by means of a pipette of LDPE for the first time left no residues on the pipette more.

Bubble formation was assessed qualitatively by the amount of bubbles that occurred during cure of the composition. As mechanical properties were the tensile strength

(Breaking strength), the elongation at break and the modulus of elasticity of the cured composition measured. For this purpose, the space temperature-warm composition stored for 6 hours at 60 ^° C. in a flat PTFE mold was poured into a film of about 2 mm thickness and cured for 7 days under standard conditions. Dumbbells with a length of 75 mm, with a web length of 30 mm and a web width of 4 mm, were punched out of the film and tested according to DIN EN 53504 at a pulling speed of 200 mm / min. The outgassing loss of the cured composition was determined by punching dumbbells of the same dimension from the film prepared as described above, keeping them open for 7 days in an oven at 100 ^° C. and then testing for weight loss relative to their initial weight (in% by weight). , The value given is the average of three dumbbells in the same movie.

The degree of outgassing of the aldehyde was calculated from the outgassing loss of the cured composition corrected for the outgassing loss of aldimine-free Comparative Example 9 ("zero value") according to the formula: Outgassing degree of aldehyde = [(outgassing loss - outgassing loss Ex. 9) / Aldehyde content] x 100% The aldehyde content of a composition can be calculated directly from the aldimine content The lower the degree of gasification of the aldehyde, the less aldehyde was outgassed.

To determine the fogging behavior, the following procedure was used: A piece of the film produced as described above was cut into pieces of about 2 ^× 2 mm in size. About 5 g of these pieces were weighed into a crystallizing dish, covered with a tared watch glass and the shell at low immersion depth in the oil bath for 24 hours at 100 ⁰ C or 12 hours heated to 130 ⁰ C, which formed a condensation fitting on the watch glass , The amount of condensate was determined by reweighing the fogged watch glass and expressed in percent of the weighed film amount as "fogging". The tendency to yellowing was evaluated qualitatively on the stored at 10O ⁰ C for 7 days, samples against an unheated reference sample on a scale of 0 to 3, with "0" no yellowing "1" weak yellowing (pale yellow), "2" Mean yellowing (deep yellow) and "3" strong yellowing (brown yellow).

The results of the tests are shown in Table 2.

Table 2: Properties of Examples 3-7 and Comparative Examples 8-9. a in Pa s, 1st figure: storage at room temperature, 2nd figure: storage at 60 ° C. ^b = [(viscosity after 7d / viscosity after 6 h) - 1] * 100%. ^c ok = no bubbles; B = bubbles; BB = many bubbles. ^d upper number: test after curing in standard climate; lower number: test after heat load of the cured material (7d / 100 ° C). nb = not determined. It can be seen from Table 2 that the inventive compositions of Examples 3 to 7, which contain a hydrazide in addition to an aldimine compared to the composition of Comparative Example 8 without hydrazide have a slight to significantly reduced Ausgasungsverlust, a lower fogging and a low tendency to yellowing , Depending on the hydrazide used, differences in storage stability are evident; Examples 3, 4 and 7 are at 60 ⁰ C storage stable, while Examples 5 and 6 are stable in storage at room temperature. Reference Example 9, which does not contain aldimine, shows low outgassing loss and low fogging, but tends to blister and yellow.

FIG. 1 shows infrared spectra. The spectrum designated IR-1 was taken up by the polyurethane composition of Example 3 after curing under standard conditions. The spectrum designated IR-2 was absorbed by the polyurethane composition of Example 3 after curing under standard conditions and subsequent heating for 24 hours at 100 ⁰ C. The spectrum designated IR-R1 is the spectrum of the aldazide of Example 1 (condensation product of adipic dihydrazide and 2,2-dimethyl-3-lauroyloxypropanal).

From the comparison of these three spectra, in particular by the characteristic for the aldazide band at 1672 cm ^{~ 1} (vc = N), it can be seen that has formed by heating the polyurethane composition of Example 3, the aldazide of Example 1. The heating of the cured at standard atmosphere film to 100 ⁰ C thus has led to a significant conversion of adipic dihydrazide with the liberated from the aldimine A-2 aldehyde (2,2-dimethyl-3-lauroyloxy-propanal) to the corresponding aldazide.

For Examples 3 and 8, an infrared spectrum was recorded subsequent to the determination of the fogging at 130 ⁰ C by the respective condensate on the watch glass. In Figure 2, the spectrum designated IR-3 shows the condensate of Example 3, while the spectrum designated IR-R2 shows the condensate of Example 8. The spectrum designated IR-R3 is derived from 2,2-dimethyl-3-lauroyloxy-propanal, ie the aldehyde released from aldimine A-2. From the comparison of these spectra, it can be seen that the condensate of Example 8 is essentially pure 2,2-dimethyl-3-lauroyl oxy-propanal, while the significantly lower amount (see Table 2) condensate of Example 3 apparently contains little or no aldehyde due to the absence of the labeled aldehyde-typical band (V _CHO ).

Preparation of One-Part Polyurethane Adhesives Examples 10 to 12 and Comparative Examples 13 to 14: Elastic adhesive film

For each example, the respective constituents according to Table 3 were processed in the specified parts by weight in a vacuum mixer with exclusion of moisture to form a homogeneous paste which was immediately filled into an internally painted aluminum cartridge and the cartridge sealed airtight. Polymer P-1 was prepared as described in Example 3.

Table 3: Composition of the adhesives of Examples 10 to 12 and Comparative Examples 13 to 14. a diisodecyl phthalate (DIDP; Palatinol ^® Z, BASF). ^b dried at 130 ° C. 0 hydrophobic fumed silica (Aerosil ^® R972, Degussa). ^d p-toluene sulfonyl isocyanate (additive Tl, Bayer). ^e 3-Glycidoxypropyltrieth- oxysilane (Dynasylan ^® GLYEO, Degussa). ^f 5% by weight of salicylic acid in di-octyl adipate. ⁹ 2,2'-Dimorpholinodiethylether (DABCO ^® DMDEE Catalyst, Air Products). ^h ratio between aldimino groups and isocyanate groups. 'Ratio between hydrazide groups and aldimino groups. The adhesives thus obtained were tested for application properties, skin formation time, mechanical properties, outgassing loss and degree of gasification of the aldehyde.

As a measure of the application properties, the stability and the thread tension were used. To determine the stability, the adhesive was applied by means of a caulking gun via a triangular nozzle as a horizontally extending triangular bead with a base diameter of 8 mm and a height (distance of the triangular tip from the base) of 20 mm on a vertical piece of cardboard. After 5 minutes, it was measured how far the tip was lowered, i. moved away from the original position in the middle of the triangle caterpillar. When the tip was in a fully or nearly unchanged position, it was considered "very good" to be "good" if the tip was between the middle and the base end. The thread tension was determined qualitatively by applying some adhesive to a wall-mounted piece of cardboard by means of a caulking gun, pulling the caulking gun away from the applied adhesive at the end of the job and measuring the length of the thread remaining at the break-off point. For the determination of the mechanical properties according to

Curing, the Shore A hardness, tensile strength, elongation at break and modulus of elasticity were measured. The Shore A hardness was determined according to DIN 53505 on test specimens cured for 14 days under standard conditions.

The other properties were tested as described in Example 3, wherein the Ausgasungsverlust was also determined after 7d / 80 ⁰ C. The outgassing loss of the aldimine-free Comparative Example 14 was used as the zero value to calculate the degree of gasification.

All adhesives cured completely free of bubbles.

The results of the tests are shown in Table 4.

Table 4: Properties of the adhesives of Examples 10 to 12 and Comparative Examples 13 to 14. a 1st figure: Testing after curing under standard conditions; 2nd figure: test after condensation (7d / 70 ° C) ("cataplasm") of the material cured in standard climates, 3rd figure: test after heat load (7d / 80 ° C) of the material cured in standard atmosphere; after heat load (7d / 100 ° C) of the material cured under standard conditions ^b upper number: after 7d / 80 ° C, lower figure: after 7d / 100 ° C.

From Table 4 it can be seen that the inventive adhesives of Examples 10 to 12, which contain a hydrazide in addition to an aldimine, compared to the adhesive of Comparative Example 13 without hydrazide have a greatly reduced Ausgasungsverlust. In use stoichiometric amounts of the hydrazide with respect to the aldimine (Examples 10 and 11) gas evolution losses are obtained at 100 ⁰ C which are close to that of Reference Example 14 without aldimine; the calculated outgassing degree of the aldehyde drops to around 0%, which means that virtually no aldehyde escapes. Examples 15 to 16 and Comparative Examples 17 to 18: Elastic Assembly Adhesive

For each example, the respective ingredients were according to the table

5 processed in the specified parts by weight in a vacuum mixer with exclusion of moisture to a homogeneous paste, this filled immediately in an internally painted aluminum cartridge and the

Cartridge hermetically sealed.

Polymer P-1 was prepared as described in Example 3.

The polyurethane polymer P-2 was prepared as follows: 590 g of polyol Acclaim ^® 4200 N (polypropylene oxide diol having an OH number of 28.5 mg KOH / g; Bayer), 1180 g of polyol Caradol ^® MD34-02 (polypropylene oxide-polyethylene triol, OH -number 35.0 mg KOH / g; Shell) and 230 g of isophorone diisocyanate (IPDI; Vestanat ^® IPDI, Degussa) were according to a known method at 80 ⁰ C to give an NCO-terminated polyurethane polymer having a titrimetrically determined free isocyanate groups of 2.1% by weight reacted.

The urea thickener was prepared as follows:

And 480 g of 4,4'-methylene diphenyl diisocyanate; In a vacuum mixer, 3000 g of diisodecyl phthalate (Palatinol ^® Z, BASF DIDP) were (4,4'-MDI; Desmodur ^® 44 MC L, Bayer) were charged and gently heated. Then, with vigorous stirring, 270 g of monobutylamine were slowly added dropwise. The resulting paste was further stirred under vacuum and cooling for one hour.

Table 5: Composition of the adhesives of Examples 15 to 16 and Comparative Examples 17 to 18. a Urea thickener. ^b 3-glycidoxypropyltriethoxysilane (Dyna Sylan GLYEO ^®, Degussa). ^c 5% by weight of salicylic acid in dioctyl adipate. dibutyltin dilaurate (5% by weight in diisodecyl phthalate). ^e 2,2'-Dimorpho- linodiethylether (DABCO ^® DMDEE Catalyst, Air Products). ^f ratio between aldimino groups and isocyanate groups. ⁹ Relationship between hydrazide groups and aldimino groups.

The adhesives thus obtained were tested for application properties, skin formation time, mechanical properties, outgassing loss and degree of aldehyde's exhaustion as described in Example 10. The outgassing loss of aldimine-free Comparative Example 18 was used as the zero value to calculate the degree of gasification. In addition, the blistering was tested as described in Example 3.

The results of the tests are shown in Table 6.

Table 6: Properties of the adhesives of Examples 15 to 16 and Comparative Examples 17 to 18. a 1. Number: Testing after curing under standard conditions; 2nd figure: test after condensation (7d / 70 ° C) ("cataplasm") of the material cured in standard climates, 3rd figure: test after heat load (7d / 80 ° C) of the material cured in standard atmosphere; after heat load (7d / 100 ° C) of the material cured in the standard climate ^b upper number: after 7d / 80 ° C, lower number: after 7d / 100 ° C. nb = not determined From Table 6 it can be seen that the invention

Adhesives of Examples 15 to 16, which in addition to the aldimine A-2 adipic acid dihydrazide, compared to the adhesive of Comparative Example 17 without hydrazide have a significantly reduced Ausgasungsverlust. When the hydrazide is used stoichiometrically with respect to the aldimine (Example 15), the outgassing loss at 80 ^° C. drops to less than half the value measured for Comparative Example 17 and reaches approximately that for Reference Example 18 which does not contain aldimine at 100 ^° C. measured value. The thermal stability of the adhesives of Examples 15 and 16 is comparable to that of Comparative Example 17.

Claims

 claims

1. A curable composition comprising a) at least one polyisocyanate P, b) at least one amine BA blocked by aldehyde or ketone, c) at least one hydrazide HY of a carboxylic or sulfonic acid having a melting point of at least 100 ^° C., in particular of at least 150 ⁰ C, with the proviso that the hydrazide HY is present in an amount of 0.3 to 1.1 equivalent hydrazide groups per equivalent of aldehyde or keto groups by means of which the amine BA is blocked.

2. A curable composition according to claim 1, characterized in that the polyisocyanate P is an isocyanate group-containing polyurethane polymer PUP, which is particularly obtainable from the implementation of at least one polyol having at least one

Polyisocyanate.

3. A curable composition according to claim 1, characterized in that the polyisocyanate P is a polyisocyanate PI in the form of a monomeric di- or triisocyanate or an oligomer of a monomeric diisocyanate.

4. A curable composition according to claim 1, characterized in that the polyisocyanate P is a polyisocyanate PI in the form of a liquid at room temperature form of MDI or a form of polymeric MDI (PMDI). A curable composition according to any one of claims 1 to 4, characterized in that the blocked amine BA is an aldimine BA1 of the formula (I), where A is the radical of an amine B after removal of n primary amino groups,

Y is an organic, optionally heteroatom-containing, radical having 1 to 35 carbon atoms and n is an integer from 1 to 5.

A curable composition according to claim 5, characterized in that the blocked amine BA is an aldimine BA1 of the formula (I a) or (I b),

where R ¹ and R ² are each independently of one another in each case a monovalent hydrocarbon radical having 1 to 12 C atoms, or together represent a bivalent hydrocarbon radical having 4 to 20 C atoms, the part of an optionally substituted, carbocyclic ring with 5 to 8, preferably 6, C atoms are;

Z ^{1 is} a monovalent hydrocarbon radical having 1 to 32 C atoms, which optionally has at least one heteroatom, in particular oxygen in the form of ether, carbonyl or ester groups, or in particular nitrogen in the form of tertiary amino groups; Z ² either represents a substituted or unsubstituted aryl or heteroaryl group which has a ring size of 5 to 8, preferably 6, atoms,

O or is CR ⁸ , wherein R ^{8 represents} a hydrogen atom or an alkoxy group, or represents a substituted or unsubstituted alkenyl or arylalkenyl group having at least 6 C atoms.

7. A curable composition according to claim 6, characterized in that R ¹ and R ² in formula (I a) each represent a methyl group.

8. A curable composition according to claim 6 or 7, characterized in that Z ¹ in formula (I a) represents a radical of the formula (II) or (III) or (IV),

in which

R ^{3 stands} for a hydrogen atom or for an alkyl group or for a cycloalkyl group or for an arylalkyl group having 1 to 12 C atoms; R ^{4 stands} for a hydrocarbon radical having 1 to 30 C atoms, which optionally contains ether oxygen atoms; R ^{5 is} either a hydrogen atom, or a linear or branched alkyl radical having 1 to 30 carbon atoms, optionally with cyclic moieties and given if there is at least one heteroatom, in particular oxygen in the form of ether, carbonyl or ester groups, or is a mono- or polyunsaturated, linear or branched hydrocarbon radical having 5 to 30 C atoms, or for one optionally substituted, aromatic or heteroaromatic 5- or 6-membered ring; R ⁶ and R ⁷ are each, independently of one another, each represent a monovalent aliphatic, cycloaliphatic or arylaliphatic radical having 1 to 20 C atoms and which optionally contains heteroatoms in the form of ether oxygen or tertiary amine nitrogen, or together for a divalent aliphatic Radical having 3 to 20 C atoms, which is part of an optionally substituted, heterocyclic ring having 5 to 8, preferably 6, ring atoms and, in addition to the nitrogen atom, optionally contains further heteroatoms in the form of ether oxygen or tertiary amine nitrogen , stand.

9. A curable composition according to claim 8, characterized in that R ^{4 stands} for a hydrocarbon radical having 6 to 30, in particular having 11 to 30, carbon atoms, which optionally contains ether oxygen atoms.

10. A curable composition according to claim 8, characterized in that R ^{5 is} a linear or branched alkyl radical having 6 to 30, in particular having 11 to 30, carbon atoms, optionally with cyclic

Proportions and optionally with at least one heteroatom, or for a mono- or polyunsaturated, linear or branched hydrocarbon radical having 6 to 30, in particular having 11 to 30, carbon atoms, most preferably a Cn-alkyl radical.

11. A curable composition according to any one of claims 5 to 10, characterized in that the amine B has at least two primary amino groups and is selected from the group consisting of 1, 6-hexamethylenediamine, 1, 5-diamino-2-methylpentane ( MPMD), 1, 3-pentanediamine (DAMP), 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane (=

Isophoronediamine or IPDA), 2,2,4- and 2,4,4-trimethylhexamethylenediamine (TMD), 1,3-xylylenediamine, 1,3-bis (aminomethyl) cyclohexane, bis (4-aminocyclohexyl) - methane, bis (4-amino-3-methylcyclohexyl) methane, 3 (4), 8 (9) -bis (aminomethyl) -tricyclo [5.2.1.0 ² ' ⁶ ] decane, 1, 2, 1, 3- and 1,4-diamino cyclohexane, 1,4-diamino-2,2,6-trimethylcyclohexane, 3,6-dioxoctane-1,8-diamine, 4,7-dioxadecane-1,10-diamine , 4-aminomethyl-1, 8-octanediamine, polyoxyalkylene polyamines having two or three amino groups, 1, 3 and 1, 4-phenylenediamine, 2,4- and 2,6-toluenediamine, 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethane, 3,3'-dichloro-4,4'-diaminodiphenylmethane and mixtures of said polyamines.

12. A curable composition according to any one of claims 5 to 10, characterized in that the amine B has at least one primary amino group and at least one further reactive group which represents either a hydroxyl group, a secondary amino group or a mercapto group, and which is in particular selected from the group consisting of N-methyl-1,2-ethanediamine, N-ethyl-1,2-ethanediamine, N-cyclohexyl-1,2-ethanediamine, N-methyl-1,3-propanediamine, N-ethyl-1, 3-propanediamine, N-butyl-1,3-propanediamine, N-cyclohexyl-1,3-propanediamine, 4-aminomethylpiperidine, 3- (4-aminobutyl) piperidine, diethylenetriamine (DETA), dipropylenetriamine (DPTA), Bis-hexamethylenetriamine (BHMT), fatty diamines such as N-cocoalkyl-1,3-propanediamine, N-oleyl-1,3-propanediamine, N-soyaalkyl-1,3-propanediamine and N-tallowalkyl-1,3-propanediamine, 5 -Amino-1-pentanol, 6-amino-1-hexanol, 4- (2-aminoethyl) -2-hydroxyethylbenzene, 3-aminomethyl-3,5,5-trimethylcyclohexanol, 2- (2-aminoethoxy) ethanol, Triethylene glycol monoamine, 3- (2-hydroxyethoxy) propylamine, 3- (2- (2-hydroxyethoxy) ethoxy) propylamine and 3- (6-hydroxyhexyloxy) propylamine.

13. A curable composition according to any one of claims 1 to 4, characterized in that the blocked amine BA is a ketimine BA2 of the formula (VII),

where A is the radical of an amine B after removal of n primary amino groups,

Z ³ and Z ⁴ are each, independently of one another, each a monovalent hydrocarbon radical having 1 to 12 C atoms, or together represent a bivalent hydrocarbon radical having 4 to 20 C atoms, the part of an optionally substituted, carbocyclic ring with 5 to 8, preferably 6, C atoms are; and n is an integer from 1 to 5.

14. A curable composition according to any one of claims 1 to 4, characterized in that the blocked amine BA is an enamine BA3, which has at least one enamine group of the formula (IX),

where Z ⁵ and Z ⁶ are each, independently of one another, in each case a hydrogen atom or a monovalent hydrocarbon radical having 1 to 12 C atoms, or together represent a bivalent hydrocarbon radical having 3 to 20 C atoms, the part of an optionally substituted carbohydrate radical cyclic ring having 5 to 8, preferably 6, carbon atoms; and

Z ^{7 represents} a hydrogen atom or a monovalent hydrocarbon radical having 1 to 12 C atoms.

15. A curable composition according to any one of claims 1 to 4, characterized in that the blocked amine BA is an oxazolidine BA4 of the formula (XI),

in which

A ² for the remainder of an amine after removal of n secondary

Amino groups;

G ^{2 is} an optionally substituted C ₂ - or C ₃ -alkylene radical;

Each of Z ⁸ and Z ⁹ independently represents a hydrogen atom or a monovalent hydrocarbon radical having 1 to 12 C atoms; and n is an integer from 1 to 5.

16. A curable composition according to any one of the preceding claims, characterized in that the hydrazide HY has the formula (XIV a) or (XIV b) or (XV),

in which W represents the p-valent radical of a hydrazide HY of a carboxylic acid which has a melting point of at least 100 ^° C., in particular of at least 150 ^° C., after removal of p hydrazide groups; X is the q-valent radical of a hydrazide HY of a sulfonic acid which has a melting point of at least 100 ^° C., in particular of at least 150 ^° C., after removal of q sulfonic acid hydrazide groups; m is zero or 1; p is 1 or 2 or 3 or 4, preferably 2; and q is 1 or 2 or 3 or 4.

17. A curable composition according to any one of the preceding claims, characterized in that the hydrazide HY is a carboxylic acid hydrazide, especially a carboxylic acid dihydrazide, preferably selected from the group consisting of carbodihydrazide, Oxalsäuredi- hydrazide, succinic dihydrazide, adipic dihydrazide, Korksäure- dihydrazide, azelaic dihydrazide , Sebacic dihydrazide, dodecanoic dihydrazide and isophthalic dihydrazide, most preferably adipic dihydrazide.

18. A curable composition according to any one of the preceding

Claims, characterized in that the hydrazide HY in an amount of 0.3 to 1.1, in particular 0.5 to 1.0, preferably from 0.75 to 1.0, equivalent hydrazide groups per equivalent of aldehyde or keto groups, by means of which the amine BA is blocked, is present.

19. A method for bonding a substrate S1 to a substrate S2, comprising the steps of: i) applying a curable composition according to any one of claims 1 to 18 to a substrate S1 at a temperature below 40 ° C; ii) contacting the applied composition with a substrate S2 within the open time of the composition; iii) curing the applied composition in a

Temperature below 40 ⁰ C; or i ') application of a curable composition according to one of claims 1 to 18 to a substrate S1 and to a substrate S2 at a temperature below 40 ⁰ C; ii ') contacting the applied composition with each other within the open time of the composition; iii ') curing the applied composition at a temperature below 40 ⁰ C; wherein the substrate S2 is made of the same or a different material as the substrate S1.

20. A method of sealing comprising the steps of: i) applying a curable composition according to any one of

Claims 1 to 18 at a temperature below 40 ⁰ C between a substrate S1 and a substrate S2, so that the composition is in contact with the substrate S1 and the substrate S2; ii ") curing the applied composition in a

Temperature below 40 ⁰ C; wherein the substrate S2 is made of the same or a different material as the substrate S1.

21. A method of coating a substrate S1 comprising the steps of: i '') applying a curable composition according to any one of claims 1 to 18 at a temperature below 40 ^° C. to a substrate S1 within the open time of the composition; the applied composition at a temperature below 40 ⁰ C.

22. Article obtained by a process according to claim 19, 20 or 21.

23. Cured composition obtained by the curing of a curable composition according to any one of claims 1 to 18 at a temperature below 40 ⁰ C by the action of water, for example in the form of atmospheric moisture, and then heating the thus cured composition to a temperature of 80 ⁰ C or higher; and wherein said cured composition contains at least one compound of the formula (XVIII a) or (XVIII b) or (XIX),

(XVIII a)

(XVIII b)

wherein W stands for the p-valent radical of a hydrazide HY of a carboxylic acid, which has a melting point of at least 100 ⁰ C, in particular of at least 150 ⁰ C, after removal of p hydrazide groups;

X is the q-valent radical of a hydrazide HY of a sulfonic acid which has a melting point of at least 100 ^° C., in particular of at least 150 ^° C., after removal of q sulfonic acid hydrazide groups; m is zero or 1; p is 1 or 2 or 3 or 4, preferably 2; and q is 1 or 2 or 3 or 4; and

Q ^{1 stands} for a hydrogen atom or for Z ³ or for Z ⁵ or for Z ⁸ , wherein if Q ^{1 is} hydrogen, Q ^{2 is} Y, or if Q ^{1 is} Z ³ , Q ^{2 is} Z ⁴ , or

Z ⁶ if Q ^{1 is} Z ⁵ , Q ^{2 stands} for - 'J ^ U _z ⁷ , or if Q ^{1 is} Z ⁸ , Q ^{2 is} Z ⁹ , where Y is an organic, optionally heteroatom,

Radical having 1 to 35 C atoms, in particular -C (R ¹ ) (R ² ) (Z ¹ ) or Z ² , where R ¹ and R ² are each, independently of one another, each a monovalent hydrocarbon radical having 1 to 12 C Atoms are, or together represent a bivalent hydrocarbon radical having 4 to 20 carbon atoms, which is part of an optionally substituted, carbocyclic ring having 5 to 8, preferably 6, carbon atoms;

Z ^{1 is} a monovalent hydrocarbon radical having 1 to 32 C atoms, which optionally has at least one heteroatom, in particular oxygen in the form of ether, carbonyl or ester groups, or in particular nitrogen in the form of tertiary amino groups;

Z ^{2 is} either a substituted or unsubstituted aryl or heteroaryl group which has a ring size of 5 to 8, preferably 6, atoms, O or is CR ⁸ wherein R represents a hydrogen atom or an alkoxy group, or represents a substituted or unsubstituted alkenyl or arylalkenyl group having at least 6 C atoms; Z ³ and Z ⁴ are each, independently of one another, each represent a monovalent hydrocarbon radical having 1 to 12 C atoms, or together represent a bivalent hydrocarbon radical having 4 to 20 C atoms, the part of an optionally substituted, carbo-cyclic ring with 5 to 8, preferably 6, C atoms are; Z ⁵ and Z ⁶ are each independently of one another in each case a hydrogen atom or a monovalent hydrocarbon radical having 1 to 12 C atoms, or together represent a bivalent hydrocarbon radical having 3 to 20 C atoms, the part of an optionally substituted, carbocyclic ring 5 to 8, preferably 6, C atoms; Z ^{7 represents} a hydrogen atom or a monovalent hydrocarbon radical having 1 to 12 C atoms; and

Z ⁸ and Z ⁹ independently of one another each represent a hydrogen atom or a monovalent hydrocarbon radical having 1 to 12 C atoms.

24. aldazide of the formula (XX a) or (XX b),

in which W ^{1 represents} the p'-valent radical of a hydrazide HY of a carboxylic acid which has a melting point of at least 100 ^° C., in particular of at least 150 ^° C., after removal of p 'hydrazide groups; R ¹ and R ² are each independently of one another in each case a monovalent hydrocarbon radical having 1 to 12 C atoms, or together represent a bivalent hydrocarbon radical having 4 to 20 C atoms, the part of an optionally substituted, carbo-cyclic ring with 5 to 8, preferably 6, C atoms are; Z ^{1 is} a monovalent hydrocarbon radical having 1 to 32 C atoms, which optionally has at least one heteroatom, in particular oxygen in the form of ether, carbonyl or ester groups, or in particular nitrogen in the form of tertiary amino groups; p 'is 2 or 3 or 4, preferably 2; and m is zero or 1.

25. Aldazide according to claim 24, characterized in that Z ^{1 is} a radical of the formula (II),

wherein R ^{3 represents} a hydrogen atom or an alkyl group or a cycloalkyl group or an arylalkyl group having 1 to 12 C atoms; and

R ^{4 is} a hydrocarbon radical having 1 to 30, in particular having 6 to 30, preferably having 11 to 30, carbon atoms, which is optionally

Contains ether oxygen atoms stands.

26. Aldazide according to claim 24, characterized in that Z ^{1 is} a radical of the formula (III), wherein R ^{3 represents} a hydrogen atom or an alkyl group or a

Cycloalkyl group or an arylalkyl group having 1 to 12 C atoms; and

R ^{5 is} either a hydrogen atom, or a linear or branched alkyl radical having 1 to 30, in particular 6 to 30, preferably 11 to 30, carbon atoms, optionally with cyclic moieties and optionally with at least one heteroatom, in particular oxygen in of the

Form of ether, carbonyl or ester groups, or represents a mono- or polyunsaturated, linear or branched hydrocarbon radical having 5 to 30 carbon atoms, or represents an optionally substituted, aromatic or heteroaromatic 5- or 6-membered Ring stands;

27. Aldazide according to claim 24, characterized in that Z ^{1 is} a radical of the formula (IV),

in which

R ^{3 represents} a hydrogen atom or an alkyl group or a cycloalkyl group or an arylalkyl group having 1 to 12 C atoms; and

R ⁶ and R ⁷ are each, independently of one another, each represent a monovalent aliphatic, cycloaliphatic or arylaliphatic radical having 1 to 20 C atoms and which, if appropriate Heteroatoms in the form of ether oxygen or tertiary amine nitrogen, or together for a bivalent aliphatic radical having 3 to 20 C atoms, the part of an optionally substituted, heterocyclic ring having 5 to 8, preferably 6, ring atoms is and optionally in addition to the nitrogen atom further heteroatoms in the form of ether oxygen or tertiary amine nitrogen, stand.

28. Use of a hydrazide HY as it is in a curable

A composition according to any one of claims 1 to 18, or an aldazide according to any one of claims 24 to 27 for reducing the yellowing of cured polyurethane compositions.

29. Use of a hydrazide HY, as it is present in a curable composition according to any one of claims 1 to 18, for reducing the aldehyde or ketone outgassing from the cured composition.