Polyurethane polymers

1. An adhesive composition comprising

5 wt. % to 100 wt. % of an alkoxysilane group-modified polymer or of a mixture of two or more such polymers modified with alkoxysilane groups wherein the polymer is obtained by reacting

a) compounds or mixtures of compounds having isocyanate-reactive groups, which comprise at least 5 wt. % of organic filler dispersed therein, with

b) an isocyanate-functional alkoxysilane compound of the general formula (I):

 wherein

Z 1 , Z 2 , and Z 3 are identical or different C 1 -C 8 -alkoxy or C 1 -C 8 -alkyl radicals, which 10 can also be bridged, but wherein at least one C 1 -C 8 -alkoxy radical must be present on each Si atom,

Q is an at least difunctional linear or branched organic radical and

wherein the polymer has a viscosity at 23° C. of 13.8 Pas or less,

0 wt. % to 50 wt. % of a plasticizer/flameproofing agent or of a mixture of two or more plasticizers/flameproofing agents,

0 wt. % to 95 wt. % of a solvent/blowing agent or of a mixture of two or more solvents/blowing agents,

0 wt. % to 20 wt. % of a moisture stabilizer or of a mixture of two or more moisture stabilizers,

0 wt. % to 5 wt. % of an antiageing agent or of a mixture of two or more antiageing agents,

0 wt. % to 5 wt. % of a catalyst or of a mixture of two or more catalysts,

0 wt. % to 80 wt. % of a filler or of a mixture of two or more fillers

and

the adhesive has a tensile shear strength of greater than 10 N/mm 2 .

2. The adhesive composition according to claim 1 , wherein Q is an alkylene radical having 1 to 8 carbon atoms.

3. The adhesive composition according to claim 1 , wherein the compounds or mixtures of compounds having isocyanate-reactive groups in part (a) comprise polyether polyols.

4. The adhesive composition according to claim 1 , in which part a) comprises at least 20 wt. % of dispersed organic filler.

5. The adhesive composition according to claim 1 , in which part a) comprises at least 15 wt. % of dispersed organic filler.

6. The adhesive composition according to claim 1 , in which part a) comprises at least 10 wt. % of dispersed organic filler.

7. The adhesive composition according to claim 1 , wherein the polymer has a viscosity at 23° C. of less than 10 Pas.

8. The adhesive composition according to claim 1 , wherein the polymer had a viscosity at 23° C. of less than 5 Pas.

9. The adhesive composition according to claim 1 , wherein the isocyanate-functional alkoxysilane compound has a molecular weight of from 140 g/mol to 500 g/mol.

10. The adhesive composition according to claim 1 , wherein the isocyanate-functional alkoxysilane compound is isocyanatomethyltrimethoxysilane, isocyanatomethyltriethoxysilane, (isocyanatomethyl)-methyldimethoxysilane, (isocyanatomethyl)methyldiethoxysilane, 3-isocyanatopropyl-trimethoxysilane, 3-isocyanatopropylmethyldimethoxysilane, 3-isocyanatopropyltriethoxysilane and 3-isocyanatopropylmethyldiethoxysilane.

11. The adhesive composition according to claim 1 , wherein the isocyanate-functional alkoxysilane compound is 3-isocyanatopropyltrimethoxysilane.

12. The adhesive composition according to claim 6 , wherein the isocyanate-functional alkoxysilane compound is 3-isocyanatopropyltrimethoxysilane.

13. A substrate coated with the adhesive according to claim 1 .