Moisture-curing polyisocyanate mixtures
View Patent ↗The invention relates to moisture-curing polyisocyanate mixtures, to a process for their preparation and to their use as binders in lacquers, coatings, adhesives and sealing materials.
1. A solvent-containing polyisocyanate mixture having a solvent content of less than 50 weight % at a runout viscosity according to DIN 53211 at 23° C. of 20 s, an NCO content of from 7 to 15 weight %, a content of monomeric TDI of less than 0.2 weight %, and a content of monomeric aliphatic and/or cycloaliphatic isocyanates of less than 0.2 weight %, wherein said mixture consists of:
A) a TDI component containing TDI isocyanurate polyisocyanates;
B) an aliphatic and/or cycloaliphatic isocyanate component containing aliphatic and/or cycloaliphatic polyisocyanates;
and
C) the reaction product of at least one of components A) and/or B) with at least one polyether polyol having a number-average molecular weight of from 500 to 4000 g/mol that contains at least one tertiary nitrogen atom
and optionally at least one polyether polyol that does not contain nitrogen atoms.
2. A process for preparing the solvent-containing polyisocyanate mixture of claim 1 ,
comprising reacting at least one of components A) and/or B) with at least one polyether polyol having a number-average molecular weight of from 500 to 4000 g/mol that contains at least one tertiary nitrogen atom, and optionally at least one polyether polyol that does not contain nitrogen atoms, in the presence of organic solvents.
3. The process of claim 2 , wherein said process is carried out in the presence of stabilizers and catalysts.
4. The process of claim 2 , wherein A) is used in an amount of from 55 to 95 weight % and B) is used in an amount of from 5 to 45 weight %, based on the total amount of A) and B).
5. A coating comprising
a) the solvent-containing polyisocyanate mixture of claim 1 ;
b) a catalyst that accelerates the reaction of free NCO groups with moisture; and
c) one or more auxiliary substances and additives.
6. A coating, adhesive bond, and/or seal comprising the solvent-containing polyisocyanate mixture of claim 1 .
7. An adhesive comprising the solvent-containing polyisocyanate mixture of claim 1 .
8. A sealing material comprising the solvent-containing polyisocyanate mixture of claim 1 .
9. A substrate coated with a coating comprising the solvent-containing polyisocyanate mixture of claim 1 .