Prepolymer Preparation
Purchase of prepolymer more expensive than its manufacture
Procedure
- Heat 690g Terathane® 1000 under vacuum with good stirring at 90oC for 1-2 hr
- Cool to 70oC under nitrogen
- Add to 435g of pure MDI
- Heat of reaction will increase temperature to 80oC
- Hold at this temperature to ensure complete reaction