DE19727029B4 - One-component reactive system composition, process for its preparation and its use - Google Patents

Abstract

-(NH-CH₂-CH₂)_n-NHR² und
n' = 1 bis 5
R = ein Alkylrest mit 1-4 C-Atomen, -OR¹ und
R¹ = -(CH₂-CH₂-O)_m-R³ oder ein Alkylrest mit 1-4 C-Atomen und
R² = H oder ein gegebenenfalls substituierter aliphatischer und/oder cycloaliphatischer oder aromatischer Kohlenwasserstoffrest mit 1-10 C-Atomen und
R³ = ein gegebenenfalls substituierter Alkylrest mit 1-10 C-Atomen und
n = 1-8, m = 1-30, p = 1 oder 2 und q = 3-p bedeuten können,
– einen Aushärtungskatalysator sowie gegebenenfalls übliche Zusatzstoffe, dadurch gekennzeichnet, dass die Zusammensetzung ferner hydrophile Weichmacher sowie einen nicht-reaktiven oder reaktiven Tackifier enthält, welcher ausgewählt ist aus Harzen, Terpen-Oligomeren, Cumaron-/Inden- Harzen, aliphatischen,...One-component reactive system composition comprising
An alkoxysilane-terminated polyurethane obtainable by reaction of OH-terminated triols and / or diols with diisocyanates in the equivalent ratio NCO: OH of 2: 1 to 1.5: 1 to NCO-terminated polyurethane prepolymers and reaction of essentially all free NCO groups the resulting polyurethane prepolymers with alkoxysilanes of the general formula I.

- (NH-CH ₂ -CH ₂ ) _n -NHR ² and
n '= 1 to 5
R = an alkyl radical having 1-4 C atoms, -OR ¹ and
R ¹ = - (CH ₂ -CH ₂ -O) _m -R ³ or an alkyl radical having 1-4 C atoms and
R ² = H or an optionally substituted aliphatic and / or cycloaliphatic or aromatic hydrocarbon radical having 1-10 C atoms and
R ³ = an optionally substituted alkyl radical having 1-10 C atoms and
n = 1-8, m = 1-30, p = 1 or 2 and q = 3-p,
A curing catalyst and optionally conventional additives, characterized in that the composition further contains hydrophilic plasticizers and a non-reactive or reactive tackifier, which is selected from resins, terpene oligomers, coumarone / indene resins, aliphatic, ...

Description

The Invention relates to a one-component reactive system composition, comprising alkoxysilane-terminated, moisture-curing polyurethanes, a process for their production and their use in adhesive, coating and sealants.

Moisture-curing one-component polyurethane systems with free NCO groups are used as the base for paints, adhesives and sealants known. Systems are also known in which a part of the NCO groups of a polyurethane prepolymer with such Alkoxysilanes are implemented in which an alkyl group of silicon one opposite Isocyanate-reactive group (e.g., mercapto, amine) (cf. US-A-3,627,722). By this measure the adhesion on different inorganic surfaces should be improved.

The curing (Networking), however, always involves the participation of unreacted, free NCO groups.

Polyurethanes reacted with organofunctional alkoxysilanes are also part of many primers on inorganic materials. Here, too, the Si (OR) ₃ groups improve the adhesion between inorganic base material and the actual coating. Furthermore, DE-A-25 51 275 describes an automotive sealing compound which cure exclusively via alkoxysilane end groups. Extremely hard masses with, for example, a Shore A hardness of 63 are obtained.

Monocomponent polyurethane systems that cure substantially via isocyanate end groups occasionally develop small bubbles in the cured mass due to the partially released carbon dioxide during cross-linking. On the other hand, curing via Si (OR) ₃ groups is in principle free of bubbles.

However, polyurethane systems with Si (OR) ₃ end groups usually form hard and brittle masses of low elasticity in the cured state. Therefore, they are not suitable in this form as the basis of sealants. Because here soft elastic masses with good resilience are required for many applications. Such systems with better stretchability than, for example, the polymer systems described in the aforementioned DE-A-25 51 275 would therefore be desirable.

Out EP-A-0 170 865 is a process for the production of moisture-resistant storage Coating, sealing and adhesive compositions are known, the good mechanical Have properties. After this process are NCO-terminated Polyether urethanes with amino or mercapto-containing alkoxysilanes with at least two ether oxygen atoms in at least one alkoxy radical converted to prepolymeric silanes. If lower levels of crosslinking the end products desired can, after this method, the NCO / silane ratio can be adjusted so that this prepalducts silane still about free NCO groups, the following with chain terminators, such as monofunctional alcohols, reacted become. Despite the good mechanical properties, these have Products a slow curing rate on.

• a) OH-terminierte Triole und/oder lineare Diole mit Diisocyanaten zu NCO-terminierten Polyurethan-Prepolymeren mit einer mittleren NCO-Funktionalität von mindestens 2 umsetzt und einen Teil der NCO-Gruppen mit linearen oder verzweigten aliphatischen Alkoholen mit 1 bis 18 C-Atomen oder Monoalkylpolyetheralkoholen zu einem Polyurethan mit einer mittleren NCO-Funktionalität von mindestens 1 und weniger als 2 umsetzt, oder
• a') die OH-terminierten Triole oder linearen Diole mit einem Gemisch von Mono- und Diisocyanaten zu NCO-terminierten Polyurethan-Prepolymeren mit einer mittleren NCO-Funktionalität von mindestens 1 und weniger als 2 umsetzt und
• b) im wesentlichen sämtliche freien NCO-Gruppen der erhaltenen Polyurethane mit Alkoxysilanen umsetzt.

EP-A-0 261 409 describes alkoxy-terminated, moisture-curing polyurethanes and adhesive and sealants containing them. The alkoxysilane-terminated polyurethanes described there are obtainable by reacting

• a) OH-terminated triols and / or linear diols with diisocyanates to give NCO-terminated polyurethane prepolymers having an average NCO functionality of at least 2 and a part of the NCO groups with linear or branched aliphatic alcohols having 1 to 18 carbon atoms or Monoalkylpolyetheralkoholen to a polyurethane having an average NCO functionality of at least 1 and less than 2, or
• a ') the OH-terminated triols or linear diols with a mixture of mono- and diisocyanates to NCO-terminated polyurethane prepolymers having an average NCO functionality of at least 1 and less than 2 and converts
• b) reacting substantially all free NCO groups of the resulting polyurethanes with alkoxysilanes.

Previously known contact adhesives usually contain a solvent. The curing of a contact adhesive is influenced in various ways by the organic solvent. After application to both substrates to be bonded, a tack-free film is obtained by evaporation. After that The system runs a contact sticky phase, which leads to high initial strengths when pressed together. The residual solvent acts temporarily as a plasticizer, so that a mutual penetration of the two adhesive densities or the thermoplastic base polymers (eg polychloroprene, polyurethane) is possible. Further evaporation of the residual solvent leads to the end of the open time, ie the adhesive layers can no longer be pressed, since the cross-linking has already progressed too far. This represents the end of the contact sticky state.

By this direct dependence the contact-sticky properties of the polymer / solvent combination is a simple conversion to solvent-free systems with the same property level is not possible.

It Therefore, an object of the present invention was a solvent-free To provide reactive system as a contact adhesive. simultaneously the open time should be independent be extended from the processing temperature, while simultaneously good initial strength and improved absolute strength achieved should be. About that In addition, the moisture absorption of the system should be improved, to improve the reaction even at low temperatures.

These Problem was solved by the invention a one-component reactive system composition according to claim 1.

Such solventless reactive system compositions have an open time of over 90 minutes. Furthermore, they show initial strengths comparable to those solvent-containing systems. With the compositions of the invention were achieved by Nachvernetzung final strengths of 6-8 N / mm ² (wood) with good resistance to heat and moisture at the same time.

When Diisocyanates for find the preparation of the NCO-terminated polyurethane prepolymer expediently aliphatic, cycloaliphatic and preferably aromatic diisocyanates Use. Specific examples are: aliphatic Diisocyanates, such as 1,4-tetramethylene diisocyanate, decane-1,10-diisocyanate, 2,2,4-trimethyl 1,6-hexamethylene diisocyanate, 2-methylpentamethylene diisocyanate-1,5, 2-ethyl-1,4-diisocyanate or mixtures of at least two of said aliphatic Diisocyanates, cycloaliphatic diisocyanates, such as isophorone diisocyanate, 1,4-cyclohexane diisocyanate, 1-methyl-2,4- and -2,6-cyclohexane diisocyanate and the corresponding isomer mixtures, 4,4'-, 2,4'- and 2,2'-dicyclohexylmethane diisocyanate and the corresponding isomer mixtures and preferably aromatic Diisocyanates, such as p-phenylene diisocyanate, 4,4'-diphenyl diisocyanate, 3,3'-dimethoxy-4,4'-diphenyl diisocyanate, Xylylene diisocyanate, 2,6- or 2,4-toluene diisocyanate, mixtures from 2,4- and 2,6-toluene diisocyanate, 4,4'-, 2,4- and 2,2'-diphenylmethane diisocyanate, mixtures from 2,4'- and 4,4'-diphenylmethane diisocyanate, urethane-modified liquid 4,4 'and / or 2,4'-diphenylmethane diisocyanates, 4,4'-diisocyanato-diphenylethane-1,2, Mixtures of 4,4'-, 2,4'- and 2,2'-diisocyanato-diphenylethane-1,2, Mixtures of 4,4'-, 2,4'- and 2,2'-diisocyanato-diphenylethane-1,2, advantageously those having a 4,4'-diisocyanato-diphenylethane-1,2-content of at least 95% by weight and 1,5-naphthylene diisocyanate. Preferably be used with diphenylmethane diisocyanate isomer mixtures a 4,4'-diphenylmethane diisocyanate content from bigger than 96 wt .-% and in particular substantially pure 4,4'-diphenylmethane diisocyanate. However, particularly preferred is 4,4'-diphenylmethane diisocyanate (MDI).

The Polyol or polyol mixture is selected from polyols with polyether segments, arising from bi- and trifunctional starters by addition of Derive ethylene and / or propylene oxide and an average molecular weight from 300 to 6000, at least difunctional polyesterols, which have an average molecular weight of 300 to 6000 hydroxyl-bearing Polymerization products of tetrahydrofuran with a middle Molecular weight from 250 to 2000, esters of carbonic acid with polyhydric, containing 2 to 10 carbon atoms alcohols with an average molecular weight of 300 to 6000, or dimer diols (reduced dimer fatty acids).

Polyols with polyether segments can be bound by known methods, for example by anionic polymerization with alkali metal hydroxides, such as sodium or potassium hydroxide or alkali metal such as sodium, sodium or potassium or potassium isopropoxide as catalysts and with the addition of at least one starter molecule 2 to 3, preferably 2 reactive hydrogen atoms contains, or by cationic polymerization with Lewis acids, such as antimony pentachloride, boron fluoride etherate, inter alia, or bleaching earth as catalysts of one or more alkylene oxides having 2 to 4 carbon atoms with alkylene be put.

suitable Alkylene oxides are preferably, for example, tetrahydrofuran, 1,3-propylene oxide, 1,2- or 2,3-butylene oxide and particularly preferably ethylene oxide and 1,2-propylene oxide. The alkylene oxides can be used individually, alternating be used sequentially or as mixtures. As bifunctional Starter molecules come For example: water, organic dicarboxylic acids, such as Succinic acid, Adipic acid and / or glutaric, Alkanolamines, e.g. Ethanolamine, N-alkyl-alkanolamines, N-alkyl-dialkanolamines, such as. N-methyl- and N-ethyldiethanolamine and preferably divalent, optionally ether bridges bound alcohols, e.g. Ethanediol, 1,2-propanediol and -1,3, butanediol-1,4, diethylene glycol, pentanediol-1,5, hexanediol-1,6, Dipropylene glycol, 2-methylene-pentanediol-1,5 and 2-ethyl-butanediol-1,4. Further, butylamine, hydroquinone, 4,4'-dihydroxyphenylmethane, 2,2-bis (4-hydroxyphenyl) propane and aniline in question. As a trifunctional starter molecule comes Glycerol or trimethylolpropane into consideration. The starter molecules can be used individually or used as mixtures.

Preferably used are polyetherols of 1,2-propylene oxide and ethylene oxide, in which more than 50%, preferably 60 to 80% of the OH groups are primary hydroxyl groups and wherein at least a portion of the ethylene oxide as a terminal block is arranged. Such polyetherols can be obtained by one e.g. to the starter molecule first the 1,2-propylene oxide and then the ethylene oxide polymerized or first the entire 1,2-propylene oxide in admixture with a portion of the ethylene oxide copolymerized and then polymerized the remainder of the ethylene oxide or gradually one at first Part of the ethylene oxide, then all of the 1,2-propylene oxide and then the remainder of the ethylene oxide is polymerized onto the starter molecule.

Especially Also suitable are the hydroxyl-containing polymerization of the tetrahydrofuran, preferably those having molecular weights until 2000.

The At least difunctional polyesterols can be obtained, for example, from dicarboxylic acids 2 to 12, preferably 4 to 6 carbon atoms and polyvalent ones Alcohols are produced. As dicarboxylic acids come, for example Aliphatic dicarboxylic acid such as succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid and sebacic and aromatic dicarboxylic acids, like phthalic acid, isophthalic acid, and terephthalic acid. The dicarboxylic acids can individually or as mixtures, e.g. in the form of an amber, glutar and adipic acid mixture, be used. For the preparation of the polyesterols, it may optionally be advantageous, instead of the dicarboxylic acids, the corresponding dicarboxylic acid derivatives, like dicarboxylic acid mono- and / or diesters having 1 to 4 carbon atoms in the alcohol radical, dicarboxylic or dicarboxylic acid chlorides to use. examples for Polyhydric alcohols are alkanediols and alkylene glycols with 2 to 10, preferably 2 to 6 carbon atoms, such as ethanediol, diethylene glycol, Butanediol-1,4, pentanediol-1,5, hexanediol-1,6, decanediol-1,10, 2,2-dimethylpropanediol-1,3, Propanediol-1,3 and dipropylene glycol. Depending on the desired Properties can the polyhydric alcohols alone or optionally in mixtures with each other or in a mixture with minor amounts of three or higher value Alcohols, e.g. Glycerol or trimethylolpropane, can be used.

Suitable are also esters of carbonic acid with the diols mentioned, in particular those with 4 to 6 carbon atoms, such as 1,4-butanediol and / or 1,6-hexanediol, condensation products of ω-hydroxycarboxylic acids, for example ω-hydroxycaproic acid and preferably polymerization products of lactones, for example. optionally substituted ω-caprolactones.

When Polyesterols are preferably used Ethanediol polyadipate, 1,4-butanediol polyadipates, ethanediol-1,4-butanediol polyadipates, 1,6-hexanediol neopentyl glycol polyadipate, 1,6-hexanediol-1,4-butanediol polyadipate and polycaprolactones.

When Polyols which according to the invention with the Diisocyanates can be reacted, Also suitable are polyhydric alcohols which are hydrogenated by hydrogenation. and / or oligomeric fatty acids available are. In this connection, dimer diols in particular should be mentioned which are hydrogenated dimer fatty acids (acyclic and cyclic dicarboxylic acids with an average of 36 carbon atoms).

According to the invention, the polyol or polyol mixture consist of several components, mainly from bifunctional compounds having an average molecular weight of 400 to 3000, preferably between 800 and 2500 and / or trifunctional portions having a molecular weight of 300 to 6000, preferably between 400 and 4000 However, the molecular weight of the polytetrahydrofuran is always limited to 250 to 2,500, preferably 400 to 2,000. Particularly preferred are mixtures of polytetra hydrofuran and polypropylene glycol in the ratio 1: 2 to 2: 1, preferably 1: 1.

The Preparation of the NCO-terminated polyurethane prepolymers takes place after for known in the art by stirring the reaction components in a heated stirred tank at a temperature of between 20 and 120 ° C, preferably 60 to 100 ° C. Already this reaction step can be carried out under a dry inert gas atmosphere (e.g. Nitrogen) become. The reaction mixture may further still desiccant, e.g. Benzoyl chloride to remove traces of water be added. For details Details, however, are directed to EP-A-0 261 409.

When Alkoxysilane of the formula I are in particular the trimethoxysilanes and triethoxysilanes. Especially however, preferred are aminoethyltrimethoxysilane, aminoethyltriethoxysilane, Aminopropyltrimethoxysilane or aminopropyltriethoxysilane.

The Reaction of the NCO-terminated polyurethane prepolymers with the alkoxysilanes again takes place according to the methods known in the art, however mandatory under exclusion of Humidity, that is to say under a protective gas atmosphere (for example nitrogen). The implementation takes place at a temperature between 20 and 120 ° C, preferably 60 to 100 ° C.

The Alkoxysilanes of the general formula I given above are commercially available Links. A presentation of these compounds and their mode of action can be found in the monograph "Silane Coupling Agents "by Plueddemann, Plenary Press, New York (1982).

Preferably the reaction of the free NCO groups of the polyurethanes takes place the alkoxysilanes according to the above general formula I in Presence of catalysts, e.g. from US-A-3,627,722 are. The use of dibutyltin dilaurate as a catalyst is prefers. The reactive system composition of the invention further contains at least one tackifier, i. a tack of the resin to the increase the stickiness of the composition. It can be unreactive or reactive tackifiers (resins) act.

The unreactive tackifiers are selected from aliphatic or aromatic (petrochemical) hydrocarbon resins, terpene resins (Oligomers), coumarone / indene resins or modified phenolic resins. For further Details of these resins is on G. Habenicht in "gluing", Springer-Verlag, 2nd edition 1990, page 100 et seq. Referenced. In the case of the reactive tackifier these are adducts obtained by conversion of at least one straight-chain containing 4 to 20 carbon atoms or branched, saturated or unsaturated monofunctional alcohol with at least one diisocyanate to NCO-terminated Urethane prepolymers and subsequent reaction of essentially all free NCO groups of the resulting urethanes with the alkoxysilanes the above formula I under a dry inert gas atmosphere. The Reaction conditions for this are derived from those for the above Reactions mentioned without further ado. In particular, the addition of the reactive tackifier causes a significant extension the open time with good initial strength.

When Diisocyanates for the manufacture of tackifiers are all those who call already above for the preparation of the polyurethane prepolymer were called.

Of the monofunctional alcohol is selected from n-butanol, isobutanol, sec-butyl alcohol, tert-butyl alcohol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, 3-methyl-1-butanol, 2-methyl-2-butanol, 3-methyl-2-butanol, 2,2-dimethyl-1-propanol, 1-hexanol, 2-ethyl-1-butanol, 4-methyl-1-pentanol, 4-methyl-2-pentanol, 1-heptanol, 2-heptanol, 3-heptanol, 4-heptanol, 2,4-dimethyl-3-pentanol, 1-octanol, 2-octanol, 2-ethyl-1-hexanol, 1-nonanol, 5-nonanol, 3,5-dimethyl-4-heptanol, 2,6-dimethyl-4-heptanol, 3,5,5-trimethyl-1-hexanol, 1-decanol, 2,7-dimethyl-2-octanol, 1-undecanol or 1-dodecanol.

Especially preferred is an adduct of ethylhexanol, isophorone diisocyanate (IPDI) and aminopropyltrimethoxysilane (AMMO).

Of the Weight fraction of the alkoxysilane-terminated polyurethane and the Tackifiers is together up to 90% by weight, based on the total amount of the composition according to the invention. Preferably the weight ratio of alkoxysilane-terminated polyurethane: tackifier 2: 1 to 1: 2.

The reactive system composition also contains hydrophilic plasticizers. These serve to improve the moisture absorption and thus to improve the reactivity at low temperature The plasticizers used are, in particular, esters such as abietic acid esters, adipic acid esters, azelaic acid esters, benzoic esters, butyric esters, acetic acid esters, esters of higher fatty acids, epoxidized fatty acid esters, glycolic acid esters, phosphoric esters, phthalic esters of branched or straight-chain alcohols containing 1 to 12 carbon atoms, propionic acid esters, sebacic acid esters, sulfonic acid esters, Thiobuttersäureester, Trimellithsäureester, citric acid esters and esters based on nitrocellulose and polyvinyl acetate in question.

However, end-capped polyethylene glycols, such as polyethyleneglycol or polypropylene glycol di-C ₁ -C ₄ -alkyl ethers, and in particular the dimethyl and diethyl ethers of diethylene glycol and dipropylene glycol, are particularly preferred. Especially with dimethyldiethylene glycol, an acceptable cure is achieved even under less favorable application conditions (low humidity, low temperature). For more details on plasticizers, however, reference is made to Ullmanns Lexikon der Technischen Chemie, 4th Edition (1983), Volume 24, pages 359-372.

Of the Proportion of the plasticizer and optionally the usual Additives makes the, taking into account the alkoxysilanterminierten Polyurethane, the tackifier and the curing catalyst, to 100 Wt .-% missing balance.

When curing catalysts for moisture curing The alkoxysilane groups are organotin compounds, in particular Dibutyltin dilaurate or dibutyltin acetylacetonate known. These can be used in combination with amines. The catalyst is in amounts of 0.01 to 2.0 wt .-% based on the total amount of composition according to the invention used.

The moisture-curing according to the invention Compositions can furthermore usual Additives such as pigments, fillers and UV stabilizers. Suitable fillers are isocyanates inert inorganic compounds, e.g. Chalk or lime, precipitated and / or fumed silica, zeolites, Bentonites, ground minerals and other inorganic substances known to those skilled in the art Fillers. Farther can also organic fillers are used, in particular fiber short cuts and the like. For some Applications are fillers preferred, which impart thixotrapy to the preparations, e.g. swellable Plastics such as PVC. The compositions possess, so that the good can be pressed out of a suitable metering device (for example a tube), a viscosity from 30,000 to 80,000, preferably from 40,000 to 60,000 mPas.

Especially the composition according to the invention is suitable for adhesive, Sealing and coating compounds.

The The invention will be further described by the following examples.

1. Preparation of an alkoxysilane-terminated polyurethane prepolymer (PUSI)

The components A) -C) are placed in a heated stirred flask with reflux condenser, N ₂ feed line, dropping funnel and internal temperature control and stirred under N ₂ atmosphere for 10 minutes. After addition of D) is stirred for about 2.5 hours at 85 ° C under N ₂ . The course of the reaction is checked by determining the NCO content. At 2.82-2.84% NCO, component E) is added and stirred until homogeneous. It is then cooled to about 60 ° C and the component F) slowly added so that a temperature of 80 ° C is not exceeded. It is stirred for another 20 minutes and bottled warm. The NCO content is 0.

The Product has a viscosity from 90000-100000 mPas.

2. Preparation of an alkoxysilane-containing reactive tackifier

The components A) and B) are presented as described above and stirred under N ₂ atmosphere for 10 minutes. After addition of C) is stirred for about 2 hours at 85 ° C under N ₂ . The course of the reaction is checked by determining the NCO content. At 11.9-12.0% NCO, component D) is added and stirred until homogeneous. It is then cooled to about 60 ° C and the component E) slowly added so that a temperature of 80 ° C is not exceeded. It is stirred for another 20 minutes and bottled warm. The NCO content is 0.

The Product has a viscosity from 25000 to 35000 mPas.

3. Preparation of a contact adhesive

The components are stirred homogeneously under N ₂ atmosphere at room temperature. Then it is filled under N ₂ in adhesive tubes.

Test Methods

The Adhesives were applied from the tube and with a 100 micron doctor blade or passed with the Pattex spatula. To determine the tensile shear strengths were beechwood tiles on an area of 5 × 2 cm overlapping bonded.

provisions initial strength: The coated wood chips became different long left open (see pictures), then in a press pressed at a pressure of 0.5 N / mm 2 for 30 seconds. To Another 2 minutes was the tensile shear strength on a ZWICK tensile machine determined (withdrawal speed 100 mm / min).

determination the final strength: The glued wooden plates become after 7 days torn as above.

Claims (10)

One-component reactive system composition, comprising - an alkoxysilane-terminated polyurethane, obtainable by reacting OH-terminated triols and / or diols with diisocyanates in the equivalent ratio of NCO: OH of 2: 1 to 1.5: 1 to NCO-terminated polyurethane prepolymers and reaction in essentially all of the free NCO groups of the obtained polyurethane prepolymers with alkoxysilanes of the general formula I.

- (NH-CH ₂ -CH ₂ ) _n -NHR ² and n '= 1 to 5 R = an alkyl radical having 1-4 C atoms, -OR ¹ and R ¹ = - (CH ₂ -CH ₂ -O) _m -R ³ or an alkyl radical having 1-4 C atoms and R ² = H or an optionally substituted aliphatic and / or cycloaliphatic or aromatic hydrocarbon radical having 1-10 C atoms and R ³ = an optionally substituted alkyl radical having 1-10 C atoms and n = 1-8, m = 1-30, p = 1 or 2 and q = 3-p, - a curing catalyst and optionally conventional additives, characterized in that the composition further comprises hydrophilic plasticizers and a non-reactive or reactive Tackifier, which is selected from resins, terpene oligomers, coumarone / indene resins, aliphatic, petrochemical resins, modified phenolic resins and adducts obtainable by reacting at least one containing 4 to 20 carbon atoms, straight or branched, saturated or unsaturated monofunctional alcohol with at least one diisocyanate to NCO-terminated urethane prepolymers and subsequent reaction of essentially all free NCO groups of the resulting urethanes with the alkoxysilanes of the formula I. One-component system composition according to claim 1, characterized in that the triols and / or diols are selected of polyols with polyether segments, polymerization products of the Tetrahydrofurans, at least difunctional polyesterols or their mixtures. One-component system composition according to claim 1 or 2, characterized in that the diisocyanate is selected from 1,4-tetramethylene diisocyanate, decane-1, 10-diisocyanate 2,2,4-trimethylhexamethylene diisocyanate, Hexamethylene diisocyanate-1,6, 2-methylpentamethylene diisocyanate-1,5, 2-ethylbutylene diisocyanate-1,4-, isophorone diisocyanate, 1,4-cyclohexane diisocyanate, 1-methyl-2,4- and 2,6-cyclohexane diisocyanate, 4,4'-2,4'- and 2,2'-dicyclohexylmethane diisocyanate, p-phenylene diisocyanate, 4,4'-diphenyl diisocyanate, 3,3'-dimethoxy-4,4'-diphenyl diisocyanate, Xylylene diisocyanate, 2,6-, 2,4-toluene diisocyanate, 4,4'-, 2,4 'and 2,2-diphenylmethane diisocyanate, urethane-modified liquid 4,4'- and / or 2,4'-diphenylmethane diisocyanates, 4,4'-2,4'- and 2,2'-diisocyanatodiphenylethane-1,2 and 1,5-naphthylene diisocyanate or mixtures thereof. A reactive system composition according to any one of claims 1 to 3, characterized in that as alkoxysilane of the formula I aminoethyltrimethoxysilane, Aminoethyltriethoxysilane, aminopropyltrimethoxysilane or aminopropyltriethoxysilane is used. A reactive system composition according to any one of claims 1 to 4, characterized in that as plasticizer phthalic acid ester of branched or unbranched 1 to 12 carbon atoms Alcohols or end-capped alkylene glycols used become. Reactive system composition according to one of claims 1 to 5, characterized in that as monofunctional alcohol n-butanol, Isobutanol, sec-butyl alcohol, tert-butyl alcohol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, 3-methyl-1-butanol, 2-methyl-2-butanol, 3-methyl-2-butanol, 2,2-dimethyl-1-propanol, 1-hexanol, 2-ethyl-1-butanol, 4-methyl-1-pentanol, 4-methyl-2-pentanol, 1-heptanol, 2-heptanol, 3-heptanol, 4-heptanol, 2,4-dimethyl-3-pentanol, 1-octanol, 2-octanol, 2-ethyl-1-hexanol, 1-nonanol, 5-nonanol, 3,5-dimethyl-4-heptanol, 2,6-dimethyl-4-heptanol, 3,5,5-trimethyl-1-hexanol, 1-decanol, 2,7-dimethyl-2-octanol, 1-undecanol or 1-dodecanol used become. A reactive system composition according to any one of claims 1 to 6, characterized in that they are organotin as a curing catalyst Contain connections. Reactive system composition according to claim 1, characterized characterized in that the weight ratio of alkoxysilanterminiertem Polyurethane: tackifier 2: 1 to 1: 2 and the proportion of these two Components together up to 90 wt .-% and the proportion of the curing catalyst 0.01-2.0 wt .-% is and the proportion of the hydrophilic plasticizer and optionally the usual Additives make up the 100 wt .-% missing remainder. A process for preparing the one-component reactive system composition as defined in any one of claims 1 to 7, characterized in that first OH-terminated triols and / or diols with diisocyanates in the equivalent ratio NCO: OH of 2: 1 to 1.5: 1 to NCO-terminated polyurethane prepolymers and then reacts all free NCO groups of the polyurethane prepolymers with alkoxysilanes of the general formula I,

in the X, n ', R, R ¹ , R ² , R ³ , n, m, p and q have the meanings defined in claim 1, and under a dry protective gas atmosphere in the presence of a curing catalyst, a hydrophilic plasticizer and a non-reactive or reactive tackifier selected from resins, terpene oligomers, coumarone / indene resins, aliphatic, petrochemical resins, modified phenolic resins and adducts obtainable by reacting at least one straight or branched chain, saturated or containing 4 to 20 carbon atoms unsaturated monofunctional alcohol with at least one diisocyanate to NCO-terminated urethane prepolymers and reaction of essentially all free NCO groups of the resulting urethanes with the alkoxysilanes of formula I, stirred homogeneously at room temperature. Use of the reactive system composition such as in one of the claims 1 to 8 defined as adhesive, coating or sealant, especially as a contact adhesive.