TY - JOUR
AU1 - Hemphill, J.
AB - 4000 molecular As the as low as 1.70 for a conventional molecu- weight polyol. the lar increases the decreases. Since unsaturation is a weight functionality will be function of molecular a molecular reached weight, limiting weight all to the chain and increase where further oxide falls to molecular propylene weight. molecular diols low unsaturation were High weight polyether containing pre- double metal With these ultra pared using cyanide catalysts. catalysts high molecular can be made without a concomitant increase in the weight polyols rate of formation of unsaturated end A 4000 molecular diol was weight groups. made that had unsaturation levels five times lower than a comparable polyol conventional KOH 7000 and molec- 11,000 prepared by catalysis. Additionally, ular diols low unsaturation levels were also made. weight containing very in elastomer for- These were evaluated polyols thermoplastic polyurethane mulations. The elastomers were based on the thermoplastic polyurethane isocyanates MDI and and chain extended with butanediol. Those from H,2MDI prepared with low unsaturation levels had polyols significantly improved physical prop- erties than elastomers with convention- thermoplastic polyurethane prepared made Soft elastomers were made from ally polyols. thermoplastic polyurethane molecular low unsaturation levels. These soft high weight polyols containing elastomers are 
TI - 2,4 Mdi Based Prepolymers: a Viable Alternative To Tdi Prepolymers in Polyurethane Sealants
JF - Journal of Cellular Plastics
DO - 10.1177/0021955X9102700154
DA - 1991-01-01
UR - https://www.deepdyve.com/lp/sage/2-4-mdi-based-prepolymers-a-viable-alternative-to-tdi-prepolymers-in-9J0xTKcCf6
SP - 46
EP - 47
VL - 27
IS - 1
DP - DeepDyve
ER -