| 摘要 |
The present invention relates to a process for the production of aqueous polyurethane-polyurea dispersions comprising the steps of:
A) reacting primary and/or secondary monoamines or diamines A1) with cyclic carbonate containing one hydroxy group A2) such that the molar ratio of total primary and/or secondary amine groups to cyclic carbonate groups is in the range of 0.8 to 1.2;B) producing an NCO-containing polyurethane prepolymer by reacting B1) polyisocyanates with B2) polymeric polyols and/or polyamines having number average molecular weights of more than 400 to 8,000 g/mol, optionally B3) low molecular weight compounds having number average molecular weights of 17-400 g/mol selected from the group consisting of mono- and polyalcohols, mono- and polyamines, and aminoalcohols; optionally B4) isocyanate-reactive, ionically hydrophilizing compounds, and B5) the reaction products of A);C) dispersing the prepolymer from B) in water; andD) optionally reacting the remaining free NCO groups of the prepolymer from B) with monoamines, polyamines, hydrazine and/or hydrazides, wherein the molar ratio of the NH groups to the NCO groups is from 0 to 1.2, and step D) occurs partially or completely prior to or during the dispersion step C). |
| 主权项 |
1. A process for preparing aqueous polyurethane-polyurea dispersions comprising a sidechain-bearing polyurethane-polyurea polymer, the process comprising the steps of
A) initially
A1) reacting primary monoamines, secondary monoamines or a mixture thereof comprising a group which is incorporated as sidechain into the polyurethane-polyurea polymer, withA2) cyclic carbonates containing one hydroxyl group, wherein the molar ratio of Al) and A2) is determined such that an arithmetic ratio of total primary and/or secondary amine groups to cyclic carbonate groups in the range from 0.8 to 1.2 is obtained, B) subsequently producing an NCO-containing polyurethane prepolymer by reacting
B1) polyisocyanates withB2) polymeric polyols, polyamines or a mixture thereof having number average molecular weights of more than 400 to 8000 g/mol,B3) optionally low molecular weight compounds having number average molecular weights of 17-400 g/mol selected from the group consisting of monoalcohols, polyalcohols, monoamines, polyamines and amino alcohols,B4) optionally isocyanate-reactive ionically or potentially ionically hydrophilizing compounds, isocyanate-reactive nonionically hydrophilizing compounds or a mixture thereof, andB5) the reaction products from A), C) the prepolymer from B) being dispersed in water, D) optionally reacting the still free NCO groups of the prepolymer with isocyanate-reactive monoamines, polyamines, hydrazine, hydrazides or a mixture thereof, wherein the amount of substance thereof is determined such that an arithmetic ratio of isocyanate-reactive NH groups to NCO groups in the range from 0 to 1.2 is obtained, wherein said reaction D) can be effected partly or else wholly before or during the dispersing step C), and wherein the Al) components are monoamines of structural formula (1) wherein
R1 is selected from the group consisting of partially and/or completely fluorinated hydrocarbons having 4 to 18 carbon atoms, polysiloxanes having molecular weights of 400 to 5000 g/mol, and mixtures thereof, R2 is hydrogen or hydrocarbons having one to 18 carbon atoms, andn is from 0 to 12. |
