| abstract |
Polyurethane and polyurea elastomers are prepared by reacting in a closed mold a reaction mixture comprising a polyisocyanate and a relatively high equivalent weight polyether. The process is characterized by employing as said polyether a polymer or copolymer of propylene oxide having at least two hydroxyl groups per molecule, an equivalent weight from 1000-5000 and a monofunctional species content of about 0.04 milliequivalent per gram (meq/g) of polymer or less. |