EP3880632A1

EP3880632A1 - Curable composition for alkaline substrates

Info

Publication number: EP3880632A1
Application number: EP19798110.3A
Authority: EP
Inventors: Andreas Kramer; Urs Burckhardt
Original assignee: Sika Technology AG
Current assignee: Sika Technology AG
Priority date: 2018-11-14
Filing date: 2019-11-11
Publication date: 2021-09-22
Also published as: JP2022504894A; US20210395155A1; AU2019382199A1; CN112839917A; CN112839917B; WO2020099309A1; MX2021003642A; CO2021004528A2; CL2021000672A1; PE20211913A1

Abstract

The invention relates to the use of a curable composition which contains at least one polyether having blocked hydroxyl groups as the plasticizer on at least one alkaline substrate. The curable composition is storage stable, easy to handle, highly resilient after curing, and does not display a tendency to separate or migrate. Said composition allows resilient adhesive bonding, sealing or coating of alkaline substrates, such as in particular fresh or green concrete or cement mortar, without the occurrence of intrusive odours caused by the saponification of the plasticizer.

Description

HARDENABLE COMPOSITION FOR ALKALINE SUBSTRATES

Technical field

The invention relates to curable compositions based on polyurethane or SMP, which are suitable for use on alkaline substrates such as, in particular, fresh (green) concrete or cement mortar, in particular as an adhesive, sealant or coating.

State of the art

Curable compositions based on polyurethanes or silane-modified polymers (SMP) are often used as adhesives, sealants or coatings in the construction sector. Typical substrates (substrates) for the application of such products come from cement, lime or silicate-bound building materials such as concrete or cement mortar. If these building materials have only recently been processed and the substrates in the form of foundations, walls, screeds, plasters, etc. are still fresh, they have a pronounced alkaline surface with pH values of 10 and higher, since the hydroxides they contain are not yet carbonated. Fresh concrete is also known as "young" or "green" or "wet". In order to protect the curable composition from contact with the alkaline surface, it can be sufficiently aged or pretreated before application of the composition, for example by neutralization with a fluid, for example a fluoridosilicate, or by sealing with a primer (primer ), for example an epoxy resin coating. In practice, however, this is often omitted in order to save time and money. Under the alkaline conditions, saponification reactions of constituents of the curable composition can occur in the boundary layer, which can result in annoying odor emissions. The plasticizers contained in most of such compositions, which are usually fatty alcohol dicarboxylic acid esters such as diisodecyl phthalate (DIDP), diisononyl-1, 2-cyclohexanedicarboxylate (DINCH) or di (2-ethylhexyl) adipate (DOA), are particularly sensitive. Their saponification leads to the release of the strongly unpleasant smelling fatty alcohols, which migrate into the pore structure of the substrates and from there into the Evaporate or wash out the surroundings and create a musty smell for a long period of time. Such long-lasting unpleasant odors are observed in particular when gluing parquet to fresh cement screed using elastic polyurethane or SMP adhesives.

Presentation of the invention

The object of the present invention is therefore to provide a curable composition suitable as an adhesive, sealant or coating in the construction sector for use on alkaline substrates, which overcomes the after parts of the prior art.

This object is achieved with the curable composition as described in claim 1. The curable composition contains at least one polyether with blocked hydroxyl groups as a plasticizer. This can be produced from readily available raw materials in a simple process, the composition is well tolerated, has a high elasticizing effect and, in the event of saponification reactions on the alkaline substrate, releases the underlying hydroxy-functional polyether, which is odorlessly neutral and has no further disruptive influences exercises. The polyether with blocked hydroxyl groups promotes good storage stability and processability of the curable composition and does not tend to migrate or separate, i.e. it does not cause sticky surfaces or stains on the substrates. The curable composition is stable in storage, easy to handle, highly elastic after curing and shows no tendency to separate or migrate. It enables elastic bonding, sealing or coating of alkaline substrates, such as especially fresh or green concrete or cement mortar, without the occurrence of annoying odors caused by plasticizer saponification.

With the use according to the invention it is thus possible to reliably and permanently bond or seal or coat substrates with strongly alkaline-reacting surfaces, the adhesive bond obtained not causing any disruptive odor emissions and being very resistant to migration effects. Further aspects of the invention are the subject of further independent claims. Particularly preferred embodiments of the invention are the subject matter of the dependent claims.

Ways of Carrying Out the Invention

The invention relates to the use of a curable composition, which contains at least one polyether with blocked hydroxyl groups as plasticizer, on at least one alkaline substrate which has a pH of at least 10 when wetted with water.

A “curable composition” is a composition containing polymerizable macromolecules that can harden through crosslinking reactions of their reactive groups or can achieve a state of increased mechanical strength.

A “polyether” refers to a molecule or a group of oligomeric and / or polymeric molecules, the majority of which consist of alkyleneoxy repeating units.

A “blocked hydroxyl group” is a hydroxyl group that has been converted into a group that is not reactive towards isocyanate groups by chemical reaction.

Non-volatile substances are referred to as "plasticizers" which are not chemically incorporated into the polymer during curing and exert a plasticizing effect on the cured polymer.

A “silane group” is a silyl group bonded to an organic radical with one to three, in particular two or three, hydrolyzable alkoxy radicals on the silicon atom.

“Silane” refers to both organoalkoxysilanes that have one to three organic substituents on each silane group and tetraalkoxysilanes. Silanes which have one or more hydroxyl, isocyanato, amino or mercapto groups on an organic radical in addition to the silane group are referred to as "hydroxysilane", "isocyanatosilane", "aminosilane" or "mercaptosilane". Substance names beginning with "poly" such as polyamine, polyol or polyisocyanate refer to substances that formally contain two or more of the functional groups that appear in their name per molecule.

The “molecular weight” is the molar mass (in grams per mole) of a molecule or a molecule residue. The “average molecular weight” is the number average molecular weight (M _n ) of a polydisperse mixture of oligomeric or polymeric molecules or molecule residues. It is usually determined using gel permeation chromatography (GPC) against polystyrene as the standard.

A “curable” or “storable” is a curable composition that can be stored at room temperature in a suitable container for a longer period of time, typically for at least 3 months to 6 months and more, without the use of it - Or usage properties changed by storage to an extent relevant to their use.

A temperature of 23 ° C is referred to as "room temperature".

In particular, the pH of the alkaline substrate wetted with water is determined using pH indicator paper.

The alkaline substrate is preferably a fresh, not yet fully carbonated substrate based on cement, lime (calcium hydroxide) and / or silicate (water glass).

The alkaline substrate is particularly preferably a fresh concrete, fresh cement mortar, fresh lime mortar or a fresh lime or silicate paint.

A concrete is called “fresh” as long as it reacts alkaline with a pH of 10 or more. The time during which a concrete is still fresh depends on its setting speed and the ambient temperature. Typically, the time period ranges from 1 to 10 days. Fresh concrete is also known as "young" or "green" or "wet". The curable composition contains at least one polyether with blocked hydroxyl groups as plasticizers.

The polyether with blocked hydroxyl groups is essentially free of unblocked hydroxyl groups. “Essentially free from” means that 95%, preferably 99%, in particular 99.9%, most preferably 100%, of the existing hydroxyl groups are blocked.

The polyether with blocked hydroxyl groups is contained in the curable composition as a plasticizer. Accordingly, it is preferably free of reactive groups which undergo crosslinking reactions with moisture or with ingredients present in the composition. In particular, it is free of isocyanate groups and silane groups.

The polyether with blocked hydroxyl groups is liquid, especially at room temperature.

The polyether with blocked hydroxyl groups preferably has a viscosity at 20 ° C. in the range from 30 to 5 3000 mPas, more preferably 40 to 2Ό00 mPas, particularly preferably 50 to 1Ό00 mPas, in particular 50 to 500 mPas. The viscosity is determined using a cone-plate viscometer with a cone diameter of 25 mm, cone angle 1 °, cone-tip-plate distance 0.05 mm at a shear rate of 10 s ^-1 . Such a polyether is easy to handle and enables compositions with high elasticity.

The blocked hydroxyl groups are preferably selected from the group consisting of acetal, ester, acetoester, carbonate and urethane groups.

These acetal, ester, acetoester, carbonate or urethane groups preferably have 1 to 15 carbon atoms.

Ester or urethane groups are particularly preferred. Hydroxyl groups can be reacted particularly easily to these groups.

An ester group, in particular an ester group having 1 to 8 carbon atoms, is very particularly preferred. An acetate group is most preferred. A polyether with blocked hydroxyl groups in the form of acetate groups is low viscosity, very easily accessible and particularly inexpensive. In the event that it saponifies on the alkaline substrate, the odorlessly neutral hydroxy-functional polyether and acetate are released, the latter being volatile and odorless in the alkaline environment.

Also preferred is a urethane group, especially a phenyl urethane group or a p-toluenesulfonyl urethane group. A polyether with such blocked hydroxyl groups has a manageable viscosity and is particularly easy to produce.

Preferred as the acetal group is a 1 - (isobutoxy) ethoxy or a tetrahydropyran-2-oxy or a tetrahydrofuran-2-oxy group, in particular a 1 - (isobutoxy) ethoxy group.

An acetoacetate group is preferred as the acetoester group.

A methyl carbonate group is preferred as the carbonate group.

These are low-viscosity and accessible from inexpensive raw materials.

The polyether with blocked hydroxyl groups preferably has 1, 2-ethyleneoxy, 1, 2-propyleneoxy, 1, 3-propyleneoxy, 1, 2-butyleneoxy or 1, 4-butyleneoxy groups, in particular 1, 2, as repeating units Propyleneoxy groups.

Preferably 70 to 100% by weight, in particular 80 to 100% by weight, of the repeating units consist of 1, 2-propyleneoxy groups and 0 to 30% by weight, in particular 0 to 20% by weight, of the repeating units consists of 1, 2- Ethyleneoxy groups.

The repeating units particularly preferably consist of 100% 1,2-propyleneoxy groups.

Such polyethers are readily available, hydrophobic and therefore particularly suitable as a component of curable compositions with low water absorption and good resistance. The polyether with blocked hydroxyl groups preferably has an average molecular weight Mn in the range from 600 to 10Ό00 g / mol, particularly preferably 700 to 5Ό00 g / mol, in particular 800 to 2,500 g / mol, determined by means of gel permeation chromatography (GPC) against polystyrene as standard with tetrahydro furan as mobile phase, refractive index detector and evaluation from 200 g / mol. Such polyethers with blocked hydroxyl groups have a manageable viscosity and do not cause any migration effect, emissions or odor in curable compositions.

The polyether having blocked hydroxyl groups is preferably derived from at least one hydroxy-functional polyether selected from the group consisting of

Alcohol, in particular n-butanol, started polyoxypropylene monols with an OH number in the range from 25 to 90 mg KOH / g, preferably 50 to 80 mg KOH / g,

- Polyoxypropylene diols with an OH number in the range from 12 to 155 mg

KOH / g, preferably 22 to 125 mg KOH / g, in particular 45 to 125 mg KOH / g,

- Trimethylolpropane or, in particular, glycerol-started, optionally ethylene oxide-terminated, polyoxypropylene triols with an average OH functionality in the range from 2.2 to 3 and an OH number in the range from 22 to 230 mg KOH / g, preferably 56 to 165 mg KOH / g, and

- Sugar alcohol-started polyoxypropylene polyols with an average OH functionality in the range from 3 to 6, in particular with threitol, erythritol, xylitol, mannitol or sorbitol as the starter molecule. Such a polyether with blocked hydroxyl groups is commercially available as Sanflex ^® SPX-80 (from Sanyo Chem. Ind.).

Of these, alcohol, in particular n-butanol, started polyoxypropylene monols or polyoxypropylene diols are preferred.

Polyoxypropylene diols are particularly preferred. These are particularly cheap.

The preferred polyethers with blocked hydroxyl groups can be prepared from readily available raw materials in a simple process, are low-viscosity and enable curable compositions with good storage stability, easy handling, high flexibility and elasticity in the hardened state without tendency to migration effects, emission or odor.

The polyether with blocked hydroxyl groups is obtained in particular by reacting at least one hydroxy-functional polyether with at least one suitable blocking agent for hydroxyl groups.

For the reaction, the blocking agent is used at least stoichiometrically with respect to the hydroxyl groups, so that the hydroxyl groups are essentially completely blocked and the polyether obtained is thus essentially free of hydroxyl groups. For blocking, customary methods are used for the respective reactive groups, optionally with the use of catalysts or solvents. If cleavers occur during the blocking reaction, they are removed from the reaction mixture using a suitable method, in particular by means of distillation.

Suitable blocking agents are nucleophilic compounds which enter into an addition or substitution reaction with hydroxyl groups.

Particularly suitable are vinyl ethers, carboxylic acids, carboxylic acid chlorides, carboxylic acid esters or carboxylic anhydrides, diketene, 2,2,5-trimethyl-4H-1,3-dioxin-4-one, alkylacetoacetates, dialkyl carbonates, monoisocyanates, (meth) acrylamides, methylene malonates or Cyanoacrylates.

Preferred are vinyl ethers, such as in particular methyl vinyl ether, ethyl vinyl ether, isopropyl vinyl ether, butyl vinyl ether, isobutyl vinyl ether, isopropenyl methyl ether, isopropenyl ethyl ether, 2,3-dihydrofuran or 3,4-dihydro-2H-pyran, particularly preferably isobutyl vinyl ether, 2,3-dihydrofuran or 3,4- Dihydro-2H-pyran, whereby blocked hydroxyl groups are formed in the form of acetal groups. The reaction is preferably carried out in the presence of an acid as a catalyst, in particular hydrochloric acid, sulfuric acid, phosphoric acid or a sulfonic acid, if appropriate in the form of an acidic ion exchange resin. Carboxylic acids, carboxylic acid chlorides, carboxylic acid esters or carboxylic acid anhydrides are preferred, blocked hydroxyl groups being formed in the form of ester groups. Of these, preference is given to carboxylic anhydrides or carboxylic acid esters, in particular acetic anhydride.

In the case of acetic anhydride as a blocking agent, acetic acid is released during the reaction, with blocked hydroxyl groups being formed in the form of acetate groups.

In the case of isopropenyl acetate as a blocking agent, acetone is released during the reaction, with blocked hydroxyl groups likewise being formed in the form of acetate groups.

Also preferred are diketene, 2,2,5-trimethyl-4H-1, 3-dioxin-4-one or sterically hindered alkyl acetoacetates such as especially tert-butyl acetoacetate, blocked hydroxyl groups being formed in the form of acetoester groups.

Also preferred are dialkyl carbonates, especially dimethyl carbonate, with blocked hydroxyl groups in the form of carbonate groups, in particular

Methyl carbonate groups arise.

Monoisocyanates are also preferred, with blocked hydroxyl groups being formed in the form of urethane groups. Phenyl isocyanate or p-toluenesulfonyl isocyanate are preferred.

Particularly suitable as hydroxy-functional polyethers are those with an average OH functionality in the range from 1 to 6 and an average molecular weight in the range from 500 to 10Ό00 g / mol, particularly preferably 600 to 5Ό00 g / mol, in particular 700 to 2,500 g / mol.

Polyoxypropylene monols with an OH number in the range from 25 to 90 mg KOH / g, preferably 50 to 80 mg KOH / g, in particular alcohol-started polyoxypropylene monols, in particular started from methanol, ethanol, propanol, isopropanol, are preferred. n-butanol, isobutanol, tert. Butanol, pentanol, hexanol, 2-ethyl hexanol, lauryl alcohol, myristyl alcohol, palmityl alcohol, allyl alcohol, cyclohexanol, benzyl alcohol or phenol. Preferred among them are alkyl alcohol-started polyoxypropylene monols, in particular started from methanol, ethanol or n-butanol. Particularly preferred are n-butanol-started polyoxypropylene monols with an average molecular weight in the range from 650 to 2,000 g / mol, in particular 700 to 1,500 g / mol. n-butanol-initiated polyoxypropylene monols are commercially available, for example as Synalox 100-20B ^®, ^® Synalox 100-40B or Synalox 100-85B ^® (all from DowDuPont Inc.).

Also preferred are polyoxypropylene diols with an OH number in the range from 12 to 155 mg KOH / g, preferably 22 to 125 mg KOH / g, in particular 45 to 125 mg KOH / g.

Preference is furthermore given to trimethylolpropane or, in particular, glycerol-started, optionally ethylene oxide-terminated, polyoxypropylene triols having an OH functionality in the range from 2.2 to 3 and an OH number in the range from 22 to 230 mg KOH / g, preferably 56 to 165 mg KOH / g.

Also preferred are sugar alcohol-started polyoxypropylene polyols with an average OH functionality of at least 3, in particular in the range from 3 to 6, in particular with threitol, erythritol, xylitol, mannitol or sorbitol as the starter molecule.

The curable composition preferably contains at least one curable polymer with proportions of polyether structural units, in particular a majority of polyoxypropylene structural units. In such a curable composition, the polyether with blocked hydroxyl groups is particularly compatible and shows little tendency to separate or migrate.

The curable composition preferably contains at least one polymer containing isocyanate and / or silane groups.

The polymer containing isocyanate and / or silane groups preferably has an average molecular weight in the range from 1 100 to 30Ό00 g / mol, in particular 2Ό00 to 20Ό00 g / mol.

It is preferably liquid at room temperature. In a preferred embodiment, the composition contains at least one polymer containing isocyanate groups. Such a composition is also referred to as a polyurethane composition.

A suitable polymer containing isocyanate groups is obtained in particular from the reaction of at least one polyol with an overstoichiometric amount of at least one diisocyanate. The reaction is preferably carried out with exclusion of moisture at a temperature in the range from 20 to 160 ° C., in particular 40 to 140 ° C., if appropriate in the presence of suitable catalysts.

The NCO / OH ratio is preferably in the range from 1.3 / 1 to 10/1. The monomeric diisocyanate remaining in the reaction mixture after the reaction of the OH groups can be removed, in particular by means of distillation.

In the event that excess monomeric diisocyanate is removed by distillation, the NCO / OFI ratio during the reaction is preferably in the range from 4/1 to 7/1, and the isocyanate group-containing polymer obtained after distillation preferably contains at most 0.5 % By weight, particularly preferably at most 0.3% by weight, of monomeric diisocyanate. Here, monomeric di isocyanate is removed in particular by means of short path distillation in vacuo.

In the event that no excess monomeric diisocyanate is removed from the polymer, the NCO / OFI ratio during the reaction is preferably in the range from 1.3 / 1 to 2.5 / 1.

The polymer obtained preferably has an isocyanate group content in the range from 0.5 to 10% by weight, in particular 1 to 5% by weight, particularly preferably 1 to 3% by weight, and an average molecular weight in the range from T500 to 20Ό00 g / mol, in particular 2Ό00 to 15Ό00 g / mol.

The polymer is optionally produced using plasticizers or solvents, the plasticizers or solvents used not containing any groups that are reactive toward isocyanates.

Aliphatic, cycloaliphatic or aromatic diisocyanates are preferred, in particular 1,6-hexamethylene diisocyanate (HDI), 1-isocyanato-3,3,5-trimethyl-5- isocyanatomethylcyclohexane (isophorone diisocyanate or IPDI), perhydro-2,4'- and / or -4,4'-diphenylmethane diisocyanate (H12MDI), 4,4'-diphenylmethane diisocyanate, optionally with proportions of 2,4'- and / or 2 , 2'-diphenylmethane diisocyanate (MDI), or 2,4-tolylene diisocyanate or mixtures thereof with 2,6-tolylene diisocyanate (TDI).

HDI, IPDI, MDI or TDI, or mixtures thereof, is particularly preferred.

Suitable polyols are commercially available polyols or mixtures thereof, in particular

- Polyether polyols, in particular polyoxyalkylene diols and / or polyoxyalkylene triols, in particular polymerization products of ethylene oxide or 1, 2-propylene oxide or 1, 2- or 2,3-butylene oxide or oxetane or tetrahydrofuran or mixtures thereof, these using a starter molecule two or three active hydrogen atoms can be polymerized, in particular a starter molecule such as water, ammonia or a compound with several OH or NH groups such as 1, 2-ethanediol, 1, 2- or 1, 3-propanediol, neopentyl glycol, Diethylene glycol, triethylene glycol, the isomeric dipropylene glycols or tripropylene glycols, the isomeric butanediols, pentanediols, hexanediols, heptanediols, octanediols, nonanediols, decanediols, undecanediols, 1, 3- or 1, 4-cyclohexolene dimethanol, bisphenol ais, bis 1, 1, 1 - trimethylolethane, 1, 1, 1 -trimethylolpropane, glycerol or aniline, or mixtures of the aforementioned compounds. Also suitable are polyether polyols with polymer particles dispersed therein, in particular those with styrene-acrylonitrile particles (SAN) or polyurea or polyhydrazodicarbonamide particles (PHD).

Preferred polyether polyols are polyoxypropylene diols or polyoxypropylene triols, or so-called ethylene oxide-terminated (EO-capped or EO-tipped) polyoxypropylene diols or triols. The latter are polyoxyethylene-polyoxypropylene mixed polyols, which are obtained in particular by further alkoxylating poly oxypropylene diols or triols after the polypropoxylation reaction has ended, and thereby having primary hydroxyl groups. Preferred polyether polyols have a degree of unsaturation of less than 0.02 meq / g, in particular less than 0.01 meq / g.

- Polyester polyols, also called oligoesterols, produced by known processes, in particular the polycondensation of hydroxycarboxylic acids or lactones or the polycondensation of aliphatic and / or aromatic polycarboxylic acids with dihydric or polyhydric alcohols. Polyester diols from the reaction of dihydric alcohols, in particular 1,2-ethanediol, diethylene glycol, 1,2-propanediol, dipropylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, are preferred. Glycerol, 1, 1, 1-trimethylolpropane or mixtures of the abovementioned alcohols, with organic dicarboxylic acids or their anhydrides or esters, such as, in particular, succinic acid, glutaric acid, adipic acid, suberic acid, sebacic acid, dodecanedicarboxylic acid, maleic acid, fumaric acid, phthalic acid, isophthalic acid , Terephthalic acid, 1, 2-cyclohexanedicarboxylic acid, 1, 3-cyclohexanedicarboxylic acid or 1, 4-cyclohexanedicarboxylic acid or mixtures of the aforementioned acids, or polyester polyols from lactones such as, in particular, e-caprolactone. Polyester polyols made from adipic acid or sebacic acid or dodecanedicarboxylic acid and hexanediol or neopentyl glycol are particularly preferred.

- Polycarbonate polyols, as are accessible by reaction, for example, of the abovementioned ge - used to build up the polyester polyols - alcohols with dialkyl carbonates, diaryl carbonates or phosgene.

- At least two block copolymers containing OH groups, which have at least two different blocks with polyether, polyester and / or polycarbonate structure of the type described above, in particular polyether polyester polyols.

- Polyacrylate or polymethacrylate polyols.

- Polyhydroxy-functional fats or oils, for example natural fats and oils, in particular castor oil; or oleochemical polyols obtained by chemical modification of natural fats and oils, for example the epoxy polyesters or epoxy polyethers obtained by epoxidation of unsaturated oils and subsequent ring opening with carboxylic acids or alcohols, or by hydroformylation and hydrogenation of unsaturated Polyols obtained from oils; or polyols obtained from natural fats and oils by degradation processes such as alcoholysis or ozonolysis and subsequent chemical linkage, for example by transesterification or dimerization, of the degradation products thus obtained or derivatives thereof. Suitable degradation products of natural fats and oils are, in particular, fatty acids and fatty alcohols and fatty acid esters, in particular the methyl esters (FAME), which can be derivatized, for example, by flydroformylation and flydration to flydroxy fatty acid esters.

- Polycarbonate polyols, also called oligohydrocarbonols, such as in particular polyhydroxy-functional polyolefins, polyisobutylenes, polyisoprenes; polyhydroxy-functional ethylene-propylene, ethylene-butylene or ethylene-propylene-diene copolymers, as are produced, for example, by the company Kraton Polymers; polyhydroxy-functional polymers of dienes, in particular 1, 3-butadiene, which in particular can also be prepared from anionic polymerization; polyhydroxy-functional copolymers from dienes such as 1, 3-butadiene or diene mixtures and vinyl monomers such as styrene, acrylonitrile, vinyl chloride, vinyl acetate, vinyl alcohol, isobutylene or isoprene, in particular polyhydroxy-functional acrylonitrile / butadiene copolymers, such as those obtained in particular from epoxides or amino alcohols and acrylonitrile / butadiene copolymers can be prepared (for example commercially available under the name Hypro ^® CTBN or CTBNX or ETBN from Emerald performance Materials); or hydrogenated polyhydroxy-functional polymers or copolymers of dienes.

Mixtures of polyols are also particularly suitable.

Polyether polyols, polyester polyols, polycarbonate polyols, poly (meth) acrylate polyols or polybutadiene polyols are preferred.

Polyether polyols, polyester polyols, in particular aliphatic polyester polyols, or polycarbonate polyols, in particular aliphatic polycarbonate polyols, are particularly preferred.

Polyether polyols, in particular polyoxyalkylene polyols, are particularly preferred. Most preferred are polyoxypropylene diols or triols or ethylene oxide terminated polyoxypropylene diols or triols.

Preferred are polyols with an average molecular weight in the range from 400 to 20 g00 g / mol, preferably from 1Ό00 to 15Ό00 g / mol.

Polyols with an average OH functionality in the range from 1.6 to 3 are preferred.

Polyols which are liquid at room temperature are preferred.

In the preparation of a polymer containing isocyanate groups, proportions of di- or polyfunctional alcohols can also be used, in particular 1, 2-ethanediol, 1, 2-propanediol, 1, 3-propanediol, 2-methyl-1, 3-propane diol, 1, 2-butanediol, 1, 3-butanediol, 1, 4-butanediol, 1, 3-pentanediol, 1, 5-pentanediol, 3-methyl-1, 5-pentanediol, neopentylglycol, dibromoneopentylglycol, 1, 2- Hexanediol, 1, 6-hexanediol, 1, 7-heptanediol, 1, 2-octanediol, 1, 8-octanediol, 2-ethyl-1, 3-hexanediol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, 1, 3- or 1, 4-cyclohexanedimethanol, ethoxylated bisphenol-A, propoxylated bisphenol-A, cyclohexanediol, hydrogenated bisphenol-A, dimer fatty acid alcohols, 1, 1, 1 - trimethylolethane, 1, 1, 1 -trimethylolpropane, glycerol, pentaerythritol, sugar alcohol such as in particular xylitol, sorbitol or mannitol or sugar such as in particular sucrose or alkoxylated derivatives of the alcohols mentioned or mixtures of the alcohols mentioned.

The isocyanate group-containing polymer preferably has an average molecular weight in the range from 1,500 to 20,000 g / mol, in particular 2,000 to 15,000 g / mol.

In addition to an isocyanate group-containing polymer, the composition can contain at least one oligomeric isocyanate or a form of MDI that is liquid at room temperature.

Suitable oligomeric isocyanates are, in particular, HDI biurets such as Desmodur ^®

N 100 N or 3200 (from Covestro AG), Tolonate ^® HDB or HDB-LV (valve applications corex Holding SAS), or Duranate 24A-100 ^® (Asahi Kasei Corp. of); HDI isocyanurates such as Desmodur ^® N 3300, N 3600 or N 3790 BA (all from Covestro AG), Tolonate ^® HDT, HDT-LV or HDT-LV2 (of Vencorex Holding SAS), Duranate TPA-100 ^® or THA-100 (by Asahi Kasei Corp.) or Coronate HX ^® (vonTosoh Corp.); HDI uretdiones as Desmodur ^® N 3400 (from Covestro AG); HDI Iminooxadiazindiones as Desmodur ^® XP 2410 (of Covestro AG); HDI allophanates such as Desmodur ^® VP LS 2102 (from Covestro AG); IPDI isocyanurates such as in solution as Desmodur ^® Z 4470 (from Covestro AG) or in solid form as Vestanat ^® T1890 / 100 (from Evonik Industries AG); TDI oligomers as Desmodur ^® IL (of Covestro AG); or mixed isocyanurates based on TDI / HDI such as Desmodur ^® HL (from Covestro AG).

A form of MDI which is liquid at room temperature either represents liquefied 4,4'-MDI by partial chemical modification - in particular carbodiimidization or uretonimine formation or adduct formation with polyols, or it is a mixture of which is brought about in a targeted manner or is dependent on the production process 4,4'-MDI with other MDI isomers (2,4'-MDI and / or 2,2'-MDI), and / or MDI oligomers and / or MDI homologues (polymeric MDI or PMDI).

In a preferred embodiment of the invention, the curable composition contains at least one latent hardener in addition to at least one isocyanate group-containing polymer. Such polyurethane compositions are particularly unaffected by blistering during curing.

Preferred latent hardeners are ketimines, aldimines or oxazolidines, in particular oxazolidines or aldimines, most preferably aldimines.

An aldimine of the formula A - [- N = B] _y is preferred, where y is 2 or 3, A is an organic radical having 2 to 23 C atoms and B is an organic radical having 6 to 30 C atoms.

A is preferably an alkylene radical which may have cyclic components or a di- or trivalent polyoxyalkylene radical having 5 to 15 carbon atoms, in particular 1,6-hexylene (1,5,5-trimethylcyclohexane-1 - yl) methane 1, 3 or a, w-polyoxypropylene with an average molecular weight in the range from 170 to 300 g / mol or trimethylolpropane-started tris (co-polyoxypropylene) with an average molecular weight in the range from 330 to 500 g / mol. B is preferably an organic radical having 7 to 22 carbon atoms, in particular 2,2-dimethyl-3-acetoxypropylidene, 2,2-dimethyl-3-lauroyloxypropylidene, 2,2-dimethyl-3- (N-morpholino ) propylidene, benzylidene or alkyl-substituted benzylidene, especially 4-decylbenzylidene, 4-undecylbenzylidene, 4-dodecylbenzylidene, 4-tridecylbenzylidene or 4-tetradecylbenzylidene, in which the 4-alkyl radicals are mostly branched.

B particularly preferably represents a radical having at least 15 carbon atoms, in particular 2,2-dimethyl-3-lauroyloxypropylidene or alkyl-substituted benzylidene. Such an aldimine is odorless.

An aldimine of the formula A- [ ^~ N = B] _y is obtained in particular by reacting an amine of the formula A- (NFl2) y with an aldehyde of the formula 0 = B with removal of water of condensation.

As the amine A (NFl2) y are preferably aliphatic or cycloaliphatic primary di- or triamines, in particular 1, 6-Flexamethylendiamin, isophoronediamine, a, w-polyoxypropylene diamines having an average molecular weight in the range of 200 to 350 g / mol, especially Jeffamine ^® D-230 (from Fluntsman Corp.), or trimethylolpropane-initiated Tris (co-polyoxypropylene), especially Jeffamine ^® T-403 (from Fluntsman Corp.).

Preferred aldehydes 0 = B are aldolesters of carboxylic acids, in particular 2,2-dimethyl-3-acetoxypropanal, -2,2-dimethyl-3-lauroxyloxypropanal, 2,2-dimethyl-3- (N-morpholino) propanal, benzaldehyde or benz aldehydes substituted with alkyl radicals, in particular 4-decylbenzaldehyde, 4-undecylbenzaldehyde, 4-dodecylbenzaldehyde, 4-tridecylbenzaldehyde or 4-tetradecylbenzaldehyde, in which the 4-alkyl radicals are mostly branched, and mixtures of these with alkyl radicals substituted benzaldehydes.

Upon contact with moisture, amino groups and possibly flydroxyl groups are released from the latent hardener, which react with isocyanates and act as crosslinkers. An aldehyde or ketone is released. In the case of the preferred aldehydes of the formula 0 = B, in which B stands for a long-chain radical, in particular for a radical with 15 or more carbon atoms, this causes no odor problems and remains in the composition after curing, where it is good is compatible and acts as a further plasticizer.

Compared to the direct reaction of water with isocyanates, crosslinking via latent hardeners has the advantage that no CO2 is released, which greatly reduces the tendency to form bubbles during curing.

In a further preferred embodiment, the curable composition contains at least one silane group-containing organic polymer. Such a polymer is also referred to as a “silane-modified polymer” (SMP) and such a composition is therefore also referred to as an SMP composition.

The silane group-containing organic polymer preferably has silane groups

formula on,

in which

R ^{a represents} a linear or branched, monovalent hydrocarbon radical having 1 to 5 carbon atoms, in particular methyl or ethyl,

R ^{b represents} a linear or branched, monovalent hydrocarbon radical having 1 to 8 carbon atoms, in particular methyl, and

x stands for a value of 0 or 1 or 2, preferably for 0 or 1, in particular for 0.

Here, methoxysilane groups have the advantage that they are particularly reactive. Ethoxysilane groups have the advantage that they are toxicologically advantageous and are particularly stable in storage.

Trimethoxysilane groups, dimethoxymethylsilane groups or triethoxysilane groups are particularly preferred.

Most preferred are trimethoxysilane groups or triethoxysilane groups. A preferred silane group-containing organic polymer is a polyolefin or a polyester or a polyamide or a poly (meth) acrylate or a polyether or a mixed form of these polymers. The silane groups can be on the side of the chain or at the ends and are bonded to the organic polymer via a carbon atom.

The silane group-containing organic polymer is particularly preferably a silane group-containing polyether.

“Silane group-containing polyethers” are organic polymers containing at least one silane group, the polymer chain of which mainly contains polyether units, in particular 1,2-oxypropylene units. In addition to the polyether units, urethane groups, urea groups, thiourethane groups, ester groups or amide groups can also be present.

The silane group-containing polyether preferably contains at least 50% by weight, in particular at least 70% by weight, particularly preferably at least 80% by weight, of 1,2-oxypropylene units.

Processes for the preparation of suitable silane group-containing polyethers are known to the person skilled in the art.

In a preferred process, silane group-containing polyethers are obtainable from the reaction of allyl group-containing polyethers with hydrosilanes, optionally with chain extension using, for example, diisocyanates.

In a further preferred process, silane group-containing polyethers are obtainable from the copolymerization of alkylene oxides and epoxysilanes, optionally with chain extension using, for example, diisocyanates.

In a further preferred process, silane group-containing polyethers are obtainable from the reaction of polyether polyols with isocyanatosilanes, optionally with chain extension using diisocyanates.

In a further preferred process, silane group-containing polyethers can be obtained from the reaction of isocyanate group-containing polyethers with aminosilanes, hydroxysilanes or mercaptosilanes. Polyethers containing silane groups from this process are particularly preferred. This method enables the use of a large number of commercially available, inexpensive starting materials, with which different polymer properties can be obtained, in particular high extensibility, high

Strength, a low modulus of elasticity, a low glass transition point or a high weather resistance.

The silane group-containing polyether is particularly preferably obtainable from the reaction of isocyanate group-containing polyethers with aminosilanes and / or hydroxysilanes and / or mercaptosilanes.

Suitable polyethers containing isocyanate groups are in particular obtainable from the reaction of polyether polyols, in particular polyoxyalkylene diols or polyoxyalkylene triols, preferably polyoxypropylene diols or polyoxypropylene triols, with an excess of stoichiometric amount of diisocyanates.

The reaction between the diisocyanate and the polyether polyol is preferably carried out with the exclusion of moisture at a temperature of 50 ° C. to 160 ° C., optionally in the presence of suitable catalysts, the diisocyanate being metered in such a way that its isocyanate groups are in proportion to the flydroxyl groups of the polyol stoichiometric excess are present. In particular, the excess diisocyanate is chosen such that, after the reaction of all the hydroxyl groups, a free isocyanate group content of 0.1 to 5% by weight, preferably 0.2 to 4% by weight, particularly preferably 0.3 to 3% by weight, based on the total polymer , remains.

Preferred diisocyanates are those already mentioned above. IPDI or TDI is particularly preferred. IPDI is most preferred. This gives polyethers containing silane groups with particularly good light fastness.

Particularly suitable as polyether polyols are polyoxypropylene diols with a degree of unsaturation lower than 0.02 mEq / g, in particular lower than 0.01 mEq / g, and an average molecular weight in the range from 400 to 25Ό00 g / mol, in particular 1Ό00 to 20Ό00 g / mol.

In addition to polyether polyols, other polyols can also be used proportionately, in particular polyacrylate polyols, and also low molecular weight diols or triols. Suitable aminosilanes for the reaction with an isocyanate group-containing polyether are primary and in particular secondary aminosilanes. Preference is given to 3-aminopropyltrimethoxysilane, 3-aminopropyldimethoxymethylsilane, 4-aminobutyltrimethoxysilane, 4-amino-3-methylbutyltrimethoxysilane, 4-amino-3,3-dimethylbutyltrimethoxysilane, N-butyl-3-aminopropylanimyltrimethoxysilane aminopropyltrimethoxysilane, adducts of primary aminosilanes such as 3-aminopropyltrimethoxysilane, 3-aminopropyldimethoxymethylsilane or N- (2-aminoethyl) -3- aminopropyltrimethoxysilane and Michael acceptors such as acrylonitrile, (meth) acrylic acid esters, (meth) maleic acid esters, (meth) acrylic acid amides, (meth) acrylic acid amides - or fumaric acid diesters, citraconic acid diesters or itaconic acid diesters, in particular N- (3-trimethoxysilylpropyl) dimethyl or diethyl aminosuccinate. Analogs of the aminosilanes mentioned with ethoxy groups instead of the are also suitable

Methoxy groups on silicon.

Suitable hydroxysilanes for the reaction with an isocyanate group-containing polyether are in particular obtainable from the addition of aminosilanes to lactones or to cyclic carbonates or to lactides.

Preferred hydroxysilanes obtained in this way are N- (3-triethoxysilylpropyl) -2-hydroxypropanamide, N- (3-trimethoxysilylpropyl) -2-hydroxypropanamide, N- (3-triethoxysilylpropyl) -4-hydroxypentanamide, N - (3-Triethoxysilylpropyl) -4-hydroxyoctanamide, N- (3-Triethoxysilylpropyl) -5-hydroxydecanamide or N- (3-Triethoxysilylpropyl) -2-hydroxypropylcarbamate.

Suitable hydroxysilanes are also available from the addition of amino silanes to epoxides or from the addition of amines to epoxysilanes.

Preferred hydroxysilanes obtained in this way are 2-morpholino-4 (5) - (2-trimethoxysilylethyl) cyclohexane-1-ol, 2-morpholino-4 (5) - (2-triethoxysilylethyl) cyclohexane-1 -ol or 1-morpholino-3- (3- (triethoxysilyl) propoxy) propan-2-ol.

Suitable mercaptosilanes for the reaction with an isocyanate group-containing polyether are in particular 3-mercaptopropyltrimethoxysilane or 3-mercaptopropyltriethoxysilane. Commercially available products are also suitable as silane group-containing polyethers, in particular the following: MS Polymer ™ (from Kaneka Corp .;

especially the types S203H, S303H, S227, S810, MA903 and S943); MS Polymer ™ or Silyl ™ (from Kaneka Corp .; in particular the types SAT010, SAT030, SAT200, SAX350, SAX400, SAX725, MAX450, MAX951); Excestar ^® (Asahi Glass Co. Ltd .; particular types S2410, S2420, S3430, S3630); SPUR + ^* (from Momentive Performance Materials Inc .; especially the types 101 OLM, 1015LM, 1050MM); Vorasil ™ (from DowDuPont Inc .; especially types 602 and 604); Desmoseal ^® (from Covestro AG; in particular the types S XP 2458, S XP 2636, S XP 2749, S XP 2774 and S XP 2821),

TEGOPAC ^® (from Evonik Industries AG; in particular the types Seal 100, Bond 150, Bond 250), Polymer ST (from Hanse Chemie AG / Evonik Industries AG, in particular the types 47, 48, 61, 61 LV, 77, 80, 81 ); Geniosil ^® STP (from

Wacker Chemie AG; especially the types E10, E15, E30, E35).

The silane group-containing polyether is particularly preferably obtained from the reaction of at least one isocyanate group-containing polyether with at least one aminosilane and / or hydroxysilane and / or mercaptosilane.

The aminosilane and / or hydroxysilane and / or mercaptosilane is preferably selected from the group consisting of N- (3-trimethoxysilylpropyl) amino dimethyl ester, N- (3-trimethoxysilyl propyl) amino amber diethyl ester, N- (3-triethoxymethyl ester) - (3-Triethoxysilylpropyl) amino succinic acid diethyl ester, N- (3-trimethoxysilylpropyl) -2-hydroxypropanamide, N- (3-triethoxysilylpropyl) -2-hydroxypropanamide, 3-mercaptopropyltrimethoxysilane and 3-mercaptopropyltriethoxysilane.

The preferred embodiments of the silane group-containing organic polymer enable compositions with good storage stability, fast curing and particularly good mechanical properties, in particular high elasticity and extensibility with good strength, and high heat resistance. The curable composition preferably additionally contains one or more further constituents, in particular selected from the group consisting of fillers, coupling agents, drying agents, thickeners and catalysts.

Suitable fillers are, in particular, ground or precipitated calcium carbonates, which are optionally coated with fatty acids, in particular stearates, barites (heavy spades), quartz flours, quartz sands, dolomites, wollastonites, calcined kaolins, layered silicates such as mica or talc, zeolites, aluminum hydroxides, magnesium hydroxides, Silicas including highly disperse silicas from pyrolysis processes, cements, gypsum, fly ash, industrially manufactured Russian, graphite, metal powder, e.g. from aluminum, copper,

Iron, silver or steel, PVC powder or hollow spheres.

Calcium carbonates which are optionally coated with fatty acids, in particular stearates, calcined kaolins or industrially produced carbon black are preferred.

In a preferred embodiment, the composition contains at least one filler based on calcium carbonate. This is particularly advantageous in the case of polyethers with blocked hydroxyl groups in the form of ester groups, such as acetate groups in particular, since the acids, if any, released therefrom by hydrolysis, such as in particular acetic acid, are bound by the calcium carbonate and thus cause no odor emissions.

The composition preferably contains 5 to 50% by weight, in particular 10 to 40% by weight, of fillers based on calcium carbonate.

Suitable adhesion promoters are in particular aminosilanes such as, in particular, 3-aminopropyltrimethoxysilane, 3-aminopropyldimethoxymethylsilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyldimethoxysilane, N- ( 2-aminoethyl) -N '- [3- (trimethoxysilyl) propyl] ethylenediamine or their analogs with ethoxy instead of methoxy groups, furthermore N-phenyl-, N- Cyclohexyl- or N-alkylaminosilanes, mercaptosilanes, epoxysilanes, (meth) acrylosilanes, anhydridosilanes, carbamatosilanes, alkylsilanes or iminosilanes, oligomeric forms of these silanes, adducts from primary aminosilanes with epoxysilanes or (meth) acrylosilanes or anhydrinosquilanes, aminofridosilanes, especially amino-functional methylsilsesquioxane or amino-functional propylsilsesquioxane, or titanates.

Epoxy silanes such as, in particular, 3-glycidoxypropyltrimethoxysilane or 3-glycidoxypropyltriethoxysilane, (meth) acrylosilanes, anhydridosilanes, carbamatosilanes, alkylsilanes or iminosilanes or oligomeric forms of these silanes are particularly suitable as flow control agents for compositions containing isocyanate groups.

Suitable drying agents for compositions with polymers containing silane groups are, in particular, tetraethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane or organoalkoxysilanes which have a functional group in the a-position relative to the silane group, in particular N- (methyldimethoxysilylmethyl) -0-methylcarbamymethyl, (methacryloxoxymethyl), (methacryloxymoxymethyl) , Orthoamic acid ester, calcium oxide or molecular sieve powder.

Suitable drying agents for compositions containing isocyanate groups are in particular molecular sieve powder, calcium oxide, highly reactive isocyanates such as p-tosyl isocyanate, monomeric diisocyanates or orthoformic acid esters.

Suitable thickeners are, in particular, fluorine, layered silicates such as bentonites, derivatives of castor oil, hydrogenated castor oil, polyamides, polyurethanes or pyrogenic silicas.

A preferred thickener is a paste which can be spread at room temperature and contains 10 to 25% by weight of fluorine compounds and 75 to 90% by weight of the polyethers described above with blocked hydroxyl groups. Such a paste is produced in particular by reacting a diisocyanate, in particular 4,4'-diphenylmethane diisocyanate, and a monoamine, in particular n-butylamine, in the polyether with blocked hydroxyl groups.

Suitable catalysts are catalysts for the crosslinking of silane groups, in particular metal catalysts such as in particular compounds of tin, Titanium, zirconium, aluminum or zinc, and / or nitrogen-containing compounds. Diorganotin (IV) compounds are preferred, such as, in particular, dibutyltin (IV) diacetate, dibutyltin (IV) dilaurate, dibutyltin (IV) dineodecanoate, dibutyltin (IV) bis (acetylacetonate) or dioctyltin (IV) dilaurate, and furthermore titanium (IV) dilaurate. - or zirconium (IV) - or aluminum (III) - or zinc (II) complexes with in particular alkoxy, carboxylate, 1, 3-diketonate, 1, 3-ketoesterate or 1, 3-ketoamidate ligand the, especially organotitanates, furthermore amines, amidines such as, in particular, 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU), 1,5-diazabicyclo [4.3.0] non-5-ene (DBN), 6 -Dibutylamino-1, 8-diazabicyclo [5.4.0] undec-7-en, 6-dibutylamino-1, 8-diazabicyclo [5.4.0] undec-7-en, N, N'-di-n- hexylacetamidine (DHA), 2-methyl-1, 4,5,6-tetrahydropyrimidine, 1, 2-dimethyl-1, 4,5,6-tetrahydropyrimidine, 2,5,5-trimethyl-1, 4.5 , 6-tetrahydropyrimidine, N- (3-trimethoxysilylpropyl) -4,5-dihydroimidazole, N- (3-tri-ethoxysilylpropyl) -4,5-dihydroimidazole, 1 - (3-dimethylaminopropyl) -2-methyl-1,4 , 5,6-tetrahydropyrimidine, 1 - (3-ami nopropyl) -2-methyl-1, 4,5,6-tetrahydropyrimi din or reaction products thereof, or guanidines such as in particular 1-butyl guanidine, 1, 1-dimethylguanidine, 1, 3-dimethylguanidine, 1, 1, 3.3 -Tetramethylguanidine (TMG), 2- (3- (trimethoxysilyl) propyl) -1, 1, 3,3-tetramethylguanidine, 2- (3- (methyldimethoxysilyl) propyl) -1, 1, 3,3- tetramethylguanidine, 2- (3- (triethoxysilyl) propyl) -1,1,3,3-tetramethylguanidine, 1,5,7-triazabicyclo [4.4.0] dec-5-ene (TBD), 7-methyl-1, 5,7-triazabicyclo [4.4.0] dec-5-ene, 7-cyclohexyl-1, 5,7-triazabicyclo [4.4.0] dec-5-ene, 1-phenylguanidine, 1 - (o-tolyl) guanidine (OTG), 1, 3-diphenylguanidine, 1, 3-di (o-tolyl) guanidine, 2-guanidinobenzimidazole or guanidines from the reaction of monoamines, polyamines or aminosilanes with carbodiimides, in particular dicyclohexylcarbodiimide or diisopropylcarbodiimide, and also biguanides.

Preferred are organo-titanates, in particular bis (ethylacetoacetato) diisobuto- xytitan (IV) (commercially available for example as Tyzor ^® ibay by Dorf Ketal), bis (ethylacetoacetato) diisopropoxy titanium (IV) (commercially available for example as Tyzor ^® DC by Dorf Ketal), bis (acetylacetonato) diisopropoxytitanium (IV), bis (acetylacetonato) diisobutoxytitanium (IV), tris (oxyethyl) amineisopropoxytitanium (IV), bis [tris (oxyethyl) amine] diisopropoxytitanium (IV), bis (2-ethylhexane-1,3,3 dioxy) titanium (IV), tris [2 - ((2-aminoethyl) amino) ethoxy] ethoxytitanium (IV), bis (neopentyl (diallyl) oxy) - diethoxytitanium (IV), tetra (isopropoxy) titanate, tetra (n-butoxy) titanate, tetra (2-ethylhexyloxy) titanate or polybutyl titanate, in particular bis (ethylacetoacetato) diisobutoxy-titanium (IV) or bis (ethylacetoacetato) diisopropoxy -titanium (IV).

Amidines or guanidines, in particular DBU, 1 - (3-dimethylaminopropyl) -2-methyl-1, 4,5,6-tetrahydropyrimidine, 1 - (3-aminopropyl) -2-methyl-1,4, are further preferred. 5,6-tetrahydropyrimidine or reaction products thereof, or guanidines from the reaction of monoamines, polyamines or aminosilanes with dicyclohexylcarbodiimide or diisopropylcarbodiimide.

Combinations of these catalysts are further preferred, in particular combinations of at least one organotitanate and at least one amidine or guanidine.

Further suitable catalysts are catalysts for accelerating the reaction of isocyanate groups, especially organotin (IV) compounds such as in particular dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dichloride, di butylzinndiacetylacetonat, dimethyltin diacetate, dioctyltin diacetate, tin dilaurate or dioctyl Dioctylzinndiacetylacetonat, complex compounds of bis mut (III) or zirconium (IV), in particular with ligands selected from alcoholates, carboxylates, 1, 3-diketonates, oxinate, 1, 3-ketoesterates and 1, 3-ketoamidates, or compounds containing tertiary amino groups, such as in particular 2,2'- Dimorpholinodiethyl ether (DMDEE).

Suitable catalysts are also catalysts for the hydrolysis of latent hardeners, in particular carboxylic acids such as 2-ethylhexanoic acid, lauric acid, stearic acid, neodecanoic acid, benzoic acid, salicylic acid or 2-nitrobenzoic acid, organic carboxylic acid anhydrides, silyl esters of carboxylic acids, organic sulfonic acids, sulfonic acid esters, other organic or inorganic acids or mixtures of the aforementioned acids or acid esters. Aromatic carboxylic acids such as benzoic acid, 2-nitrobenzoic acid or in particular salicylic acid are preferred.

The curable composition can contain further additives, in particular: - Inorganic or organic pigments, especially titanium dioxide, chromium oxides or iron oxides;

- additional plasticizers;

- Fibers, in particular glass fibers, carbon fibers, metal fibers, ceramic fibers, plastic fibers such as polyamide fibers or polyethylene fibers, or natural fibers such as wool, cellulose, hemp or sisal;

- nanofillers such as graphene or carbon nanotubes;

- dyes;

- Other catalysts which accelerate the reaction of the isocyanate groups and / or silane groups, in particular salts, soaps or complexes of tin (II), iron, aluminum, molybdenum, dioxomolybdenum or potassium, in particular aluminum lactate, aluminum oleate or potassium acetate; Compounds containing tertiary amino groups, in particular N-ethyldiisopropylamine, N, N, N ', N'-tetramethylalkylene diamines, pentamethylalkylene triamines and higher homologues thereof, bis- (N, N-diethylaminoethyl) adipate, tris (3-dimethylamino-propyl) amine, 1,4-diazabicyclo [2.2.2] octane (DABCO), N-alkylmorpholines, N, N'-dimethylpiperazine; aromatic nitrogen compounds such as 4-dimethylaminopyridine, N-methylimidazole, N-vinylimidazole or 1, 2-dimethylimidazole;

organic ammonium compounds such as benzyltrimethylammonium hydroxide or alkoxylated tertiary amines; as well as so-called “delayed action” catalysts, which represent modifications of known metal or amine catalysts;

- Solvents, especially acetone, methyl acetate, tert-butyl acetate, 1-methoxy-2-propyl acetate, ethyl 3-ethoxypropionate, diisopropyl ether, diethylene glycol diethyl ether, ethylene glycol diethyl ether, ethylene glycol monobutyl ether, ethylene glycol mono-2-ethylhexyl ether, acetals such as propylal, butyl 2-ethylhexylal, dioxolane, glycerol formal or 2, 5,7,10-tetraoxaundecane (TOU), toluene, xylene, heptane, octane, naphtha, white spirit, petroleum ether or petrol, especially Solvesso ™ types (from ExxonMobil Chemical Co.) , as well as propylene carbonate, dimethyl carbonate, butyrolactone, N-methylpyrrolidone, N-ethylpyrrolidone, p-chlorobenzotrifluoride or benzotrifluoride;

- natural resins, fats or oils such as rosin, shellac, linseed oil, castor oil or soybean oil; non-reactive polymers, in particular homopolymers or copolymers of unsaturated monomers, in particular from the group comprising ethylene, propylene, butylene, isobutylene, isoprene, vinyl acetate or alkyl (meth) acrylates, in particular polyethylene (PE), polypropylene (PP), Polyisobutylenes, ethylene vinyl acetate copolymers (EVA) or atactic poly-a-olefins (APAO);

flame-retardant substances, in particular the fillers already mentioned aluminum hydroxide or magnesium hydroxide, and in particular organic phosphoric acid esters such as, in particular, triethyl phosphate, tricresyl phosphate, triphenyl phosphate, diphenylcresyl phosphate, isodecyl diphenyl phosphate, tris (1,3-dichloro-2-propyl) phosphate, tris (2) phosphate, tris (2-ethylhexyl) phosphate, tris (chloroisopropyl) phosphate, tris (chloropropyl) phosphate, isopropylated triphenyl phosphate, mono-, bis- or tris (isopropylphenyl) phosphates of different degrees of isopropylation, resorcinol bis (diphenyl phosphate), bisphenol -A-bis (diphenyl phosphate) or ammonium polyphosphates;

- Additives, in particular wetting agents, leveling agents, defoamers, deaerators, stabilizers against oxidation, heat, light or UV radiation or biocides; or other substances commonly used in curable compositions.

It may be useful to dry certain substances chemically or physically before mixing them into the composition.

The curable composition is preferably largely free of plasticizers containing fatty alcohol esters. In particular, it is largely free of phthalates. It preferably contains less than 2% by weight, particularly preferably less than 1% by weight, in particular less than 0.5% by weight, of phthalates.

The curable composition preferably contains 10 to 40% by weight of polyether with blocked hydroxyl groups.

A preferred curable composition comprises

10 to 50% by weight polymer containing isocyanate and / or silane groups,

- 20 to 60% by weight of fillers and

- 10 to 40% by weight polyether with blocked hydroxyl groups. The curable composition is produced in particular in the absence of moisture and is stored at ambient temperature in moisture-tight containers. A suitable moisture-tight container consists in particular of a possibly coated metal and / or plastic and is in particular a barrel, a container, a flobbock, a bucket, a canister, a can, a bag, a tubular bag, a cartridge or a tube.

The curable composition can be in the form of a one-component or in the form of a multi-component, in particular two-component, composition.

A "one-component" is a composition in which all components of the composition are in the same container, which as such is stable in storage and which is curable with moisture.

A “two-component” is a composition in which the components of the composition are in two different components, which are stored in separate containers and are only mixed with one another shortly before or during application of the composition.

The curable composition is preferably one-component and moisture-curing. With suitable packaging and storage, it is stable in storage, typically for several months to a year or longer.

When used according to the invention, the curable composition is applied to at least one alkaline substrate. The substrate can be pretreated prior to application, in particular by cleaning processes or the application of an activator or primer, wherein an optionally applied activator or primer typically does not completely close the surface of the substrate, so that it reacts, at least in places, in an alkaline manner . The process of curing begins when the composition is applied. The result is the cured composition.

In the case of a one-component moisture-curing composition, it is applied as such and then begins to cure under the influence of moisture or water. To accelerate curing, the composition can be admixed with an accelerator component which contains or releases water and / or a catalyst, or the composition can be brought into contact with such an accelerator component after its application.

In the case of a two-component composition, this is applied after the two components have been mixed and begins to harden by internal reaction, the hardening possibly being completed by the action of external moisture. The two components can be mixed continuously or batchwise using dynamic mixers or static mixers.

During curing, existing isocyanate groups react with one another under the influence of moisture and / or with other reactive groups, in particular flydroxyl groups or amino groups, which may be present in the composition. Furthermore, existing isocyanate groups react with hydrolyzing reactive groups of any latent hardener present. Existing silane groups react with each other during curing under the influence of moisture. They can hydrolyze to silanol groups (Si-OH groups) on contact with moisture. Existing silane groups can condense with existing silanol groups to siloxane groups (Si-O-Si groups).

The moisture required to cure a moisture-curing composition is preferably diffused into the composition from the air (air humidity). A solid layer of hardened composition (skin) forms on the surfaces of the composition that are in contact with air. The hardening continues along the direction of diffusion from the outside in, whereby the skin becomes increasingly thicker and finally includes the entire applied composition. The moisture can additionally or completely also get into the composition from one or more substrate (s) to which the composition has been applied and / or originate from an accelerator component which is added to the composition during application or after the application is brought into contact with it, for example by brushing or spraying.

The curable composition is preferably applied at ambient temperature, in particular in the range from approximately -10 to 50 ° C., preferably in the range from -5 to 45 ° C., in particular 0 to 40 ° C.

The composition is preferably also cured at ambient temperature.

The curable composition can be formulated so that it has a pasty consistency with a high yield point, in particular for use as an adhesive or sealant. Such a composition can be filled or applied under pressure using a suitable device, for example using a cartridge gun or a barrel pump or an application robot, the composition being discharged in particular in the form of a caterpillar with an essentially round or triangular cross-sectional area. The layer thickness of the applied composition is in particular in the range from 0.5 to 50 mm, preferably 1 to 30 mm.

The curable composition can also be formulated in such a way that it is liquid and so-called self-leveling or only slightly thixotropic, in particular for use as a sealing compound or coating. Such a composition can be poured out or applied with a spatula. As a coating, it can then be distributed over the entire area up to the desired layer thickness, for example by means of a roller, squeegee, toothed trowel or a rubber wiper. A layer thickness in the range from 0.5 to 5 mm, in particular 1 to 3 mm, is typically applied in one operation.

The curable composition is stable in storage, easy to handle, highly elastic after curing and shows no tendency to separate or migrate. It enables elastic bonding, sealing or coating of alkaline substrates, such as fresh or green concrete or cement mortar, in particular, without the occurrence of annoying odors caused by plasticizer saponification.

Another object of the invention is a method for gluing or sealing or coating, comprising the steps

(i) providing the curable composition as previously described,

(ii) providing at least one alkaline substrate, as described above,

(iii) contacting the curable composition with the alkaline

Substrate,

(iv) curing the composition.

In the case of a two- or multi-component composition, the components are mixed before step (iii).

Step (iii) can be carried out by applying the curable composition to the alkaline substrate.

Step (iii) can furthermore be carried out by applying the curable composition to any substrate and then bringing the applied composition into contact with the alkaline substrate.

The composition can be applied between two or more substrates, or it can be brought into contact with other substrates after application to a first substrate. At least one of the substrates with which the applied composition is in contact is an alkaline substrate, as described above.

Other substrates that can be in contact with the composition are in particular - Glass, glass ceramic, concrete, mortar, cement screed, fiber cement, in particular fiber cement slabs, brick, brick, plaster, in particular gypsum slabs or anhydride screed, or natural stones such as granite or marble;

- Repair or leveling compounds based on PCC (polymer-modified ze

ment mortar) or ECC (epoxy resin-modified cement mortar);

- metals or alloys such as aluminum, copper, iron, steel, non-ferrous metals, including surface-coated metals or alloys such as galvanized or chromed metals;

- asphalt or bitumen;

- Leather, textiles, paper, wood, wood materials bound with resins such as phenol, melamine or epoxy, resin-textile composites or other so-called polymer composites;

- plastics such as hard and soft PVC, polycarbonate, polystyrene, polyester, polyamide, PMMA, ABS, SAN, epoxy resins, phenolic resins, PUR, POM, TPO,

PE, PP, EPM or EPDM, each untreated or surface-treated, for example by means of plasma, corona or flame;

- Fiber reinforced plastics, such as carbon fiber reinforced plastics (CFRP), glass fiber reinforced plastics (GFK) and sheet molding compounds (SMC);

- Insulating foams, in particular made of EPS, XPS, PUR, PIR, rock wool, glass wool or foamed glass (foam glass);

- coated or painted substrates, especially painted tiles, ge

painted concrete, powder-coated metals or alloys or painted sheets.

If necessary, the substrates can be pretreated before application, in particular by physical and / or chemical cleaning processes or by applying an activator or a primer.

The same or different can be glued and / or sealed

Substrates.

The application between several substrates is particularly typical in the case of a sealant for joints, while the application to a first substrate and then contacting a second substrate is typical for an adhesive. Such an adhesive can also have a sealing function.

A coating is typically only applied to a substrate, and cases are also possible where a coating is in contact with further substrates, for example in edge regions.

After use, the curable composition preferably represents an adhesive or sealant or a coating.

The cured adhesive or sealant or the cured coating is preferably elastic.

As an adhesive, the composition is particularly suitable for adhesive and sealing applications in the construction industry on alkaline substrates, in particular for gluing parquet on fresh cement screed or for gluing components on fresh concrete.

As a sealant, the composition is particularly suitable for sealing joints, seams or flea spaces on alkaline substrates in construction, in particular for sealing dilation joints or connection joints between components.

As a coating, the composition is particularly suitable for protecting alkaline substrates, in particular floors or walls, in particular as a coating for building icons, terraces, squares, bridges, parking decks, or for sealing roofs, in particular flat roofs or slightly inclined roof areas or roof gardens, or in the interior of buildings for waterproofing, for example under tiles or ceramic plates in wet rooms or kitchens, or as flooring in kitchens, industrial halls or manufacturing rooms, or as a seal in drip pans, channels, shafts, silos, dances or waste water treatment plants.

An article is obtained from the process of gluing or sealing or coating.

Another object of the invention is thus an article which is glued, sealed or coated with the composition described. The article is in particular a building of civil engineering or a part thereof, in particular a bridge, a roof, a staircase, a floor or a facade, or an attachment part thereof.

The article is particularly preferably a parquet floor glued to a concrete or cement screed, which was glued to the still fresh and thus alkaline screed. The use of an adhesive that does not release any odor-intensive fission products in an alkaline environment is particularly important, since the adhesive is applied to a comparatively large area in an interior, which means that any odor emissions that occur are particularly intense, long-lasting and disruptive.

An adhesive bond is obtained from the process for gluing or sealing or coating.

Another object of the invention is thus an adhesive composite comprising the cured composition, as described above, and at least one substrate adhering to the composition, the surface of which was alkaline at the time of contact with the composition, as previously described.

The cured composition preferably comprises

10 to 50% by weight of cured polymer,

- 20 to 60% by weight of fillers, and

- 10 to 40% by weight polyether with blocked hydroxyl groups.

The cured composition in the adhesive bond according to the invention preferably has a layer thickness in the range from 0.5 to 50 mm, preferably 1 to 30 mm.

The adhesive bond is part of the article which is glued, sealed or coated with the composition. The use according to the invention enables elastic bonding, sealing or coating of alkaline substrates, such as, in particular, fresh or green concrete or cement mortar, without the occurrence of unpleasant odors caused by plasticizer saponification, as occurs with conventional plasticizers such as DIDP or DINCH.

Examples

Exemplary embodiments are listed below which are intended to explain the described invention in more detail. Of course, the invention is not restricted to the exemplary embodiments described.

A "standard climate" ("NK") is a temperature of 23 + 1 ° C and a relative humidity of 50 + 5%.

Unless otherwise stated, the chemicals used were from Sigma-Aldrich Chemie GmbH.

Preparation of polyethers with blocked hydroxyl groups:

The viscosity was measured with a thermostatted Rheotec RC30 cone-plate viscometer (cone diameter 25 mm, cone angle 1 °, cone tip-plate distance 0.05 mm, shear rate 10 s ^-1 ).

Infrared spectra (FT-IR) were measured as undiluted films on a FT-IR device Nicolet iS5 from Thermo Scientific equipped with a horizontal ATR measuring unit with diamond crystal. The absorption bands are given in wavenumbers (cm ¹ ).

¹ H-NMR spectra were measured on a Bruker Ascend 400 spectrometer at 400.14 MHz; the chemical shifts d are given in ppm relative to tetramethylsilane (TMS). Real and pseudo coupling patterns were not distinguished.

Polyether-1: n-butanol-started acetylated PPG monol with an average molecular weight of approx. 800 g / mol

120.00 g n-butanol-started polyoxypropylene monol (Synalox ^® 100-20B, with an average molecular weight of approx. 750 g / mol; from DowDuPont Inc.) and 18.74 g of vinegar Acid anhydride were placed in a round bottom flask with a distillation attachment under a nitrogen atmosphere. The reaction mixture was then stirred at 130 ° C. under a gentle stream of nitrogen, acetic acid being collected as the distillate. The volatile constituents were then removed from the reaction mixture at 80 ° C. and 10 mbar vacuum. A clear, colorless liquid with a viscosity of 75 mPa s at 20 ° C was obtained.

FT-IR: 2970, 2931, 2867, 1738, 1454, 1372, 1345, 1296, 1241, 1098, 1014, 959, 925, 866, 827.

¹ H-NMR (CDCls): 5.02 (hept., 1 H, CFI ₂ (CFI ₃ ) CH-OAc), 3.75 - 3.34 (2 xm, approx. 39 H, 0CH ₂ CH (CH ₃ ) 0), 3.33 - 3.28 (m, 2 H, CH3CH2CH2CH ₂ O), 2.04 (s, 3 H, 0 (CO) C H3), 1.55 (quint., 2 H, CH3CH2CH ₂ CH2O), 1.36 (sext., 2 H,

CH3CH ₂ CH2CH2O), 1 .22 (d, 3 H, CH ₂ (CH ₃ ) CH-OAC), 1 .17 - 1 .10 (m, approx. 36 H, 0CH ₂ CH (CH ₃ ) 0), 0.91 (t, 3H, CH3CH2CH2CH2O).

Polyether-2: Diacetylated PPG diol with average molecular weight approx. 1 Ί 00 g / mol

80.00 g of polyoxypropylene diol (Voranol ^® P 1010 OFI number 1 10 mg KOFI / g; from DowDuPont Inc.) and 18.74 g of acetic anhydride were reacted as described for polyether -1. A clear, colorless liquid with a viscosity of 145 mPa s at 20 ° C. was obtained.

Polyether-3: diacetylated PPG diol with average molecular weight approx. 2Ί 00 g / mol

160.00 g of polyoxypropylene diol (Voranol ^® 2000 L, OFI number of 56 mg KOFI / g; from DowDuPont Inc.) and 18.74 g of acetic anhydride were reacted as described for polyether -1. A clear, colorless liquid with a viscosity of 400 mPa s at 20 ° C was obtained.

Creation of further raw materials:

Polymer P1:

3080 g polyoxypropylene diol (Acclaim ^® 4200, from Covestro AG; OFI number 28.5 mg KOFI / g), 1540 g polyoxypropylene polyoxyethylene triol (Caradol ^® MD34-02, from Shell Chemicals Co .; OFI number 35.0 mg KOFI / g ) and 385 g tolylene diisocyanate (Desmodur ^® T 80 P, Covestro AG) was liquid at 80 ° C by a known process to a room temperature, the NCO-terminated polyurethane polymer having a free isocyanate group content 1.50 wt .-% was obtained.

Aldimine-1: N, N'-bis (2,2-dimethyl-3-lauroyloxypropylidene) -3-aminonethyl-3,5,5-trimethylcyclohexylamine

598 g (2.1 mol) of 2,2-dimethyl-3-lauroyloxypropanal were placed in a round bottom flask under nitrogen atmosphere. Then, 170.3 g (1 mol) of 3-aminomethyl-3,5,5-trimethylcyclohexylamine thyl added (Vestamin IPD ^® from Evonik Industries AG) under good agitation and then the volatiles at 80 ° C and 10 mbar vacuum removed. 732 g of a colorless liquid with an amine content of 2.73 mmol N / g were obtained, which was calculated

Aldimine equivalent weight of 367 g / mol corresponds.

Thixotropic agent T-1:

In a vacuum mixer, 300 g of polyether-1 and 48 g of 4,4'-methylenedi phenyl diisocyanate (Desmodur ^® 44 MC L, of Covestro AG), warmed slightly to and subsequently with vigorous stirring, 27 g of n-butylamine was dropped slowly. The resulting paste was further stirred under vacuum and cooling for one hour. A white, finely divided, homogeneous, spreadable paste was obtained.

Thixotropic agent T-2:

Manufactured as described for thixotropic agent T-1, but using 300 g of polyether-2 instead of polyether-1. A white, finely divided, homogeneous, spreadable paste was obtained.

Thixotropic agent T-3:

Prepared as described for thixotropic agent T-1 but using in place of polyether-1 300 g of diisodecyl phthalate (Palatinol ^® 10-P, from BASF SE) were used. A white, finely divided, homogeneous, spreadable paste was obtained. Thixotropic agent T-4:

Prepared as described for thixotropic agent T-1 but using in place of polyether-1 300 g of diisononyl 1, 2-cyclohexanedicarboxylate (DINCH Hexamoll ^®, BASF SE) were used. A white, finely divided, homogeneous, spreadable paste was obtained.

Production of mortar prisms:

A dry mixture was produced using T300 parts by weight (GT) of quartz sand 0 to 1 mm, 200 GT of limestone powder (unfired) and 900 GT of Portland cement CEM I 42.5N. 400 GT water were separated with 6.3 GT Sika ^®

ViscoCrete ^® -3082 (retarder / superplasticizer; from Sika Schweiz AG) and this mixture mixes well with the in a mechanical mixer for 3 min

Mixed dry mix. The mortar obtained was poured into several 80 x 40 x 40 mm molds, covered with plastic film and stored in a standard atmosphere. After 24 hours, the plastic film was removed and the hardened but still fresh mortar prisms were removed from the molds, cleaned on the outside with a steel brush and freed from dust. Curable compositions were applied immediately to the fresh (green) mortar prisms thus prepared, as described below.

Production of curable compositions (one-component):

Compositions Z1 to Z5

For each composition, the ingredients listed in Table 1 were mixed in the stated amounts (in parts by weight) using a centrifugal mixer (SpeedMixer ™ DAC 150, FlackTek Inc.) with exclusion of moisture for one minute at 3000 rpm.

Each composition was tested as follows:

The skin formation time (HBZ) was determined as a measure of the open time. For this purpose, a few grams of the composition were applied to cardboard in a layer thickness of approx. 2 mm and the time was determined in the standard atmosphere until, for the first time, no residues remained on the pipette when the surface of the composition was lightly tapped using a pipette made of LDPE. The Shore A hardness was determined according to DIN 53505 on test specimens cured for 14 days in a standard atmosphere.

To determine the mechanical properties, the composition was applied to a PTFE-coated film to form a film 2 mm thick, which was stored for 14 days in a standard atmosphere, some dumbbells 75 mm long with a web length of 30 mm and a web width of 4 mm punched out of the film and this according to DIN EN 53504 at a tensile speed of 200 mm / min for tensile strength (breaking strength), elongation at break, modulus of elasticity 5% (at 0.5-5% elongation) and modulus of elasticity 25% (at 0.5 -25% elongation). The aspect was assessed visually on the films produced. A non-sticky film without bubbles was described as "beautiful".

The smell was judged by smelling the nose at a distance of 2 cm on the freshly made films, “No” means that no smell was perceptible.

The results are shown in Table 1.

The compositions designated (Ref.) Contain no polyethers according to the invention with blocked hydroxyl groups.

Table 1: Composition (in parts by weight) and properties of Z1

to Z5. "N.b." stands for "not determined"

¹ diisodecyl phthalate (Palatinol ^® 10-P, from BASF SE)

² diisononyl-1, 2-cyclohexanedicarboxylate (Hexamoll ^® DINCH, from BASF SE)

³ Omyacarb ^® 5-GU (from Omya AG)

⁴ 5% by weight in di (2-ethylhexyl) adipate

Use of the curable compositions on fresh mortar:

Examples 1 to 5

Each of the compositions Z1 to Z5, produced as described above, was applied to two of the fresh (green) mortar prisms prepared as described above in a layer thickness of 2 mm over an area of 30 × 80 mm. The first prism coated in this way was kept in a closed aluminum can for 24 hours in a forced-air oven at 80 ° C. and then checked for odor formation. These results are labeled "(1d 80 ° C)". The second coated prism was kept in a sealed aluminum can for 7 days in a standard atmosphere and then also checked for odor formation. These results are labeled "(7d NK)". The odor formation was determined by carefully opening the aluminum can in the standard atmosphere and immediately detecting any smell by smelling the nose in the air space of the aluminum can and its composition. "No" means that no smell was perceptible. A mild smell, which is typical for the composition in the warm state as its own smell, is described as “mild”. A clearly noticeable, musty smell is described as “distinct”. A "strong" is a strong, musty smell.

The results are shown in Table 2.

The examples labeled (Ref.) Are comparative examples.

Table 2: Properties (odor formation) of compositions Z1 to

Z5 on fresh (green) mortar.

Claims

Claims:

1. Use of a curable composition which contains at least one polyether with blocked hydroxyl groups as plasticizer, on at least one alkaline substrate which has a pH of at least 10 when wetted with water.

2. Use according to claim 1, characterized in that the

alkaline substrate is a fresh concrete, fresh cement mortar, fresh lime mortar or a fresh lime or silicate paint.

3. Use according to one of claims 1 or 2, characterized

records that the blocked hydroxyl groups are selected from the group consisting of acetal, ester, acetoester, carbonate and urethane groups.

4. Use according to one of claims 1 to 3, characterized in that in the polyether 70 to 100% by weight of the repeating units

1,2-propyleneoxy groups and 0 to 30% by weight of the repeating units consist of 1,2-ethyleneoxy groups.

5. Use according to one of claims 1 to 4, characterized in that the polyether with blocked hydroxyl groups has an average molecular weight Mn in the range from 600 to 10Ό00 g / mol, determined by means of gel permeation chromatography (GPC) against polystyrene as a standard with tetrahydrofuran as a mobile phase, refractive index detector and evaluation from 200 g / mol.

6. Use according to one of claims 1 to 5, characterized in that the polyether with blocked hydroxyl groups is derived from at least one hydroxy-functional polyether selected from the group consisting of

Alcohol, especially n-butanol, started polyoxypropylene monols with an OH number in the range from 25 to 90 mg KOH / g, Polyoxypropylene diols with an OH number in the range from 12 to 155 mg KOH / g,

- Trimethylolpropane or, in particular, glycerol started, optionally terminated with ethylene oxide, polyoxypropylene triols with an average OH functionality in the range from 2.2 to 3 and an OH number in the range from 22 to 230 mg KOH / g, and

Sugar alcohol-started polyoxypropylene polyols with an average OH functionality in the range from 3 to 6, in particular with threitol, erythritol,

Xylitol, mannitol or sorbitol as a starter molecule.

7. Use according to one of claims 1 to 6, characterized in that the curable composition contains at least one polymer containing isocyanate and / or silane groups.

8. Use according to one of claims 1 to 7, characterized in that the curable composition contains at least one polymer containing isocyanate groups and at least one latent hardener.

9. Use according to one of claims 1 to 8, characterized in that the curable composition contains at least one filler based on calcium carbonate.

10. Use according to one of claims 1 to 9, characterized in that the curable composition

- 10 to 50% by weight containing isocyanate and / or silane groups

Polymer,

- 20 to 60% by weight of fillers and

- 10 to 40% by weight polyether with blocked hydroxyl groups.

11. Use according to one of claims 1 to 10, characterized

indicates that the curable composition is one-component and moisture-curing.

12. A method of gluing or sealing or coating comprising the steps

(i) providing the curable composition as described in one of claims 1 or 3 to 11,

(ii) providing at least one alkaline substrate as described in one of claims 1 or 2,

(iii) contacting the curable composition with the alkaline substrate,

(iv) curing the composition.

13. Article obtained from the process according to claim 12.

14. Article according to claim 13, characterized in that it is a parquet floor glued to a screed made of concrete or cement mortar.

15. Adhesive bond obtained from the use according to one of claims 1 to 11 or the method according to claim 12, comprising the cured composition and at least one substrate adhering to the composition, the surface of which at the time of contact

Bringens with the composition was alkaline and had a pH of at least 10 when wetted with water.