反应详情

To a mechanically-stirred mixture of 28.59 weight parts of trimethylhexamethylene diisocyanate and 0.04 weight part of stannous octoate in a reactor and purged with dry air, there is added 44.80 weight parts of polytetramethylene ether glycol, while maintaining the reaction temperature at 50° to 60° C. After the addition is complete, the mixture is heated to 70° to 80° C. and held for 3 hours. A 26.58 weight parts of hydroxyethyl methacrylate (HEMA) was added and the mixture was stirred at 70° to 80° C. until the percent NCO assay was below 0.01%.

1. custompurged
2. customwith dry air, there
3. additionis added 44.80 weight parts of polytetramethylene ether glycol
4. temperaturewhile maintaining the reaction temperature at 50° to 60° C
5. additionAfter the addition
6. temperaturethe mixture is heated to 70° to 80° C.
7. additionA 26.58 weight parts of hydroxyethyl methacrylate (HEMA) was added