Urea-derived products and methods for making same
Urea-derived products, for example liquid compositions containing urea-derived compounds, such as dihydroxyethyleneurea (“DHEU”), and methods for making same are provided.
1. A liquid composition produced from reacting a glyoxal aqueous solution and a urea solution such that the liquid composition exhibits a pH of greater than 5 to about 6.4 and comprises dihydroxyethyleneurea present in the liquid composition and greater than 0 to less than 4000 ppm of glycoluril present in the liquid composition as measured according to the HPLC Test Method.
2. The liquid composition according to claim 1 wherein the liquid composition comprises less than 3000 ppm of glycoluril as measured according to the HPLC Test Method.
3. The liquid composition according to claim 1 wherein the liquid composition further comprises a buffering agent.
4. The liquid composition according to claim 3 wherein the buffering agent is selected from the group consisting of: amines, hydroxides, bicarbonates, carbonates, phosphates, pH resins, and mixtures thereof.
5. The liquid composition according to claim 4 wherein the buffering agent is selected from the group consisting of: triethanolamine, sodium hydroxide, potassium hydroxide, sodium bicarbonate, calcium carbonate, magnesium carbonate, sodium phosphate, sodium hydrogen phosphate, citric acid, and mixtures thereof.
6. The liquid composition according to claim 1 wherein dihydroxyethyleneurea is present in the liquid composition at a level of greater than 5% by weight as measured according to the HPLC Test Method.
7. The liquid composition according to claim 1 wherein dihydroxyethyleneurea is present in the liquid composition at a level of up to about 50% by weight as measured according to the HPLC Test Method.
8. The liquid composition according to claim 1 wherein the liquid composition comprises less than 20% by weight of dihydroxyethyleneurea of urea as measured according to the 1 H NMR Test Method.
9. The liquid composition according to claim 1 wherein the liquid composition comprises greater than 2% on weight of dihydroxyethyleneurea of urea as measured according to the 1 H NMR Test Method.