Polyurethane structural member

Claim 2

A polyurethane structural member such as a facia prepared from a set liquid reaction mixture which goes from a liquid to a set state in less than four minutes in a mold heated about 100*-140*F. and exhibits free NCO groups at the time it is removed from the mold and has ultimate structural characteristics of a tear (pli) of 440 to 600, tangent modulus of elasticity at -20*F. of 83,000 + or - 1,000, at 75*F. of 27,000 + or - 6,000 and at 158*F. of 5,000 + or - 1,000 and a sag at 250*F. for one hour of less than 0.3 inches and a Shore D hardness of 56 + or -3.

Claim 3

THE STRUCTURAL MEMBER OF CLAIM 1 OBTAINED BY REACTING A LIQUID REACTION MIXTURE COMPRISING A MIXTURE OF 86 TO 104 PARTS OF A QUASI-PREPOLYMER OF METHANE-DI( PHENYL ISOCYANATE) AND TRIPROPYLENE ETHER GLYCOL OR DIPROPYLENE ETHER GLYCOL HAVING 18 TO 26 WEIGHT PERCENT FREE NCO, 82 TO 72 PARTS OF POLYPROPYLENE ETHER TRIOL, SAID TRIOL BEING OBTAINED BY CONDENSING PROPYLENE OXIDE ON A TRIOL GENERATOR SELECTED FROM THE GENERATOR CONSISTING OF TRIMETHYLOL PROPANE, TRIMETHYLOL ETHANE AND GLYCOL AND CAPPING WITH 10 TO 25 MOLE PERCENT OF ETHYLENE OXIDE TO GIVE A MOLECULAR WEIGHT OF 4500 TO 6500, 14 TO 25 PARTS OF 1,4-BUTANEDIOL, AND 0 TO 10 PARTS OF A BLOWING AGENT SELECTED FROM THE HALOHYDROCARBONS BOILING BELOW 110*F, OR WATER TO GIVE A DENSITY OF 50 TO 70 POUNDS PER CUBIC