Tissue adhesive with accelerated curing
The present invention relates to a polyurea system encompassing as component A) isocyanate-functional prepolymers obtainable by reaction of aliphatic isocyanates A1) with polyols A2), which can in particular have a number average molecular weight of ≧400 g/mol and an average OH functionality of 2 to 6, as component B) amino-functional compounds of general formula (I) in which X is an organic residue comprising a tertiary amino function, having no Zerewitinoff active hydrogen, R 1 is a CH 2 —COOR 3 residue, in which R 3 is an organic residue having no Zerewitinoff active hydrogen, a linear or branched C1 to C4 alkyl residue, a cyclopentyl or cyclohexyl residue or H, R 2 is an organic residue having no Zerewitinoff active hydrogen, n is an integer ≧2 or ≦3, in particular for closing, binding, bonding or covering cell tissue, and to a metering system for the polyurea system according to the invention.
1. A polyurea system comprising
as component A) an isocyanate-functional prepolymer obtained by reacting
an aliphatic isocyanate A1) with
a polyol A2), and
as component B) an amino-functional compound of general formula (I)
in which
X is a residue of formula (II)
wherein R 4 , R 5 , R 6 are, each independently of one another or simultaneously, a methyl, ethyl, propyl or butyl residue, having no Zerewitinoff active hydrogen, wherein at least two of R 4 , R 5 , R 6 are a methylene, ethylene, propylene, or butylene residue, having no Zerewitinoff active hydrogen,
R 1 is a linear or branched C1 to C4 alkyl residue, a cyclopentyl or cyclohexyl residue, H, or a CH 2 —COOR 3 residue, in which R 3 is an organic residue having no Zerewitinoff active hydrogen,
R 2 is a linear or branched C1 to C10 organic residue having no Zerewitinoff active hydrogen, and
n is 2 or 3.
2. The polyurea system according to claim 1 , wherein the polyol A2) comprise a polyester polyol and/or a polyester-polyether polyol and/or a polyether polyol.
3. The polyurea system according to claim 1 , wherein the polyol A2) has a number average molecular weight of from 4000 to 8500 g/mol.
4. The polyurea system according to claim 1 , comprising as component C) an organic filler.
5. The polyurea system according to claim 4 , wherein the organic filler is a hydroxy-functional compound.
6. The polyurea system according to claim 5 , wherein the hydroxy-functional compound is a polyether polyol.
7. The polyurea system according to claim 5 , wherein the hydroxy-functional compound has an average OH functionality of 1.5 to 3.
8. The polyurea system according to claim 1 , comprising as component D) a pharmacologically active compound.
9. A method for closing, binding, bonding or covering cell tissue comprising utilizing the polyurea system according to claim 1 .
10. A metering system comprising two chambers for a polyurea system according to claim 1 , wherein one of the chambers comprises component A) and the other chamber comprises component B) and optionally component C) and D).