Acetone → Trimethylolpropane

Participants

Reaction Steps

The reaction is stopped by adding ethanolamine. The amount of ethanolamine added can be calculated based on the isocyanate content remaining. When the isocyanate content is 0 percent, a mixture of 25.9 parts of 80 percent mercaptoacetic acid, 28.2 parts of triethylamine, and 16 parts of acetone are added dropwise. After a reaction period of 2 hours at 60° C., 104 parts of Desmodur®L (the polyaddition product of 1 mole trimethylolpropane and 3 moles toluene diisocyanate produced according to German Pat. No. 1,090,196 of Bayer AG) (75 percent solution is acidic ester) are stirred in and 5 minutes later the mixture is dispersed with 700 parts of water. The solvent is removed by distillation under a vacuum.

Provenance & Evidence