Patent ID: 6830705
Filing Date: 2004-12-14
Classification: C08G

Abstract:
A room-temperature liquid stable prepolymer (P) which is the reaction product ofa) methylene diphenylisocyanate or a prepolymer of methylene diphenylisocyanate and an about 500-1000 equivalent weight polytetramethylene ether glycol or polyoxypropylene/polyoxyethylene diol or triol having at least 21% residual NCO, b) polytetramethylene ether glycol of about 500 to 1000 equivalent weight, and c) a polyoxypropylene/polyoxyethylene triol or polyoxypropylene triol of about 1300 to 2000 equivalent weight, the percentage weight/weight in the prepolymer (P) being about 32 to 72% of (a), about 52 to 22% of (b), and about 6 to 15% of (c), and the percentage of residual NCO in the prepolymer (P) being about 6 to 18% by weight, the prepolymer (P) having a viscosity at room temperature of about 1200 to 26000 cps, which prepolymer (P) is curable and castable with a liquid curative at room temperature to yield a urethane elastomer.