Polyurethane urea solutions
AssigneeBayer MaterialScience AG
InventorsJurgen Kocher, Gerald Kurek, Holger Casselmann, Jurgen Urban, Thomas Feller
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Abstract
This invention relates to solutions of polyurethaneureas in γ-butyrolactone or mixtures of γ-butyrolactone with toxicologically acceptable organic solvents. A process for coating substrates using these polyurethaneurea solutions, and substrates coated by said process are also provided. The substrates coated according to the invention are preferably textile products or leather, but materials such as wood or concrete can also be coated according to the invention.
Claims11
A solution of polyurethaneureas in solvents comprising γ-butyrolactone.
A process for the preparation of polyurethaneurea solutions, the process comprising
- 1) reacting a macrodiol and, optionally a low-molecular weight aliphatic diol, with a diisocyanate until all hydroxyl groups have been consumed;
- 2) adding a solvent comprising γ-butyrolactone or solvent mixtures comprising γ-butyrolactone to the composition obtained in step 1);
- and
- 3) adding a chain extender to the mixture obtained in step 2).
Dependencies are inferred from the claim text.