POLYURETHANE ELASTOMERS OF LOW HARDNESS

摘要

Mo3449 LeA 27,126 POLYURETHANE ELASTOMERS OF LOW HARDNESS This invention relates to substantially linear thermoplastic polyurethanes prepared by a process comprising reacting organic polyisocyanates; at least one polyester derivative having at least two isocyanate reactive hydrogen atoms, wherein said polyester derivative is a polyester of an .alpha.,.omega.-dicarboxylic acid containing a total of at least 16 carbon atoms and a non-vicinal diol, in an amount such that the proportion of the .alpha.,.omega.-dicarboxylic acid is greater than 35% by weight based on the total quantity of thermoplastic polyurethane; and chain lengthening agents having no phenolic OH groups. This invention also relates to the process used to prepare such thermoplastic polyurethanes. This invention further relates to the use of the thermoplastic polyurethanes for medical purposes. Mo3449