| 摘要 |
PURPOSE: To prepare a casting polyurethane elastomer compsn. which has rapid curability and excellent rebound resilience and can provide a cast article possessing high rebound resilience and excellent abrasion resistance and water resistance. CONSTITUTION: This compsn. comprises a solution A of a NCO-terminated urethane prepolymer having an NCO group content of 5 to 15wt.% and prepd. by reacting diphenylmethane diisocyanate with a polytetramethylene ether glycol and a solution B of a curing agent containing a polytetramethylene ether glycol, a short-chain diol, and a catalyst, the content of the glycol in the total weight of the solutions A and B being 70 to 78% by weight, the no.-average mol.wt. of the glycol in the solutions A and B being 1,400 to 3,000. |
