Polyurethane resin transfer molding systems

Details Polyurethane resin transfer molding systems Polyurethane resin transfer molding systems

C - Chemistry, Metallurgy

08

G

C08G 18/68 (2006.01) C08G 18/08 (2006.01) C08G 18/32 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01)

Patent

CA 2188503

This invention relates to a process for preparing rigid polyurethane by the reaction, under resin transfer molding conditions at an isocyanate index of 90 to 130, of (a) an organic polyisocyanate, with (b) certain polyester polyols based on long-chain fatty acid or fatty alcohol groups and having a number average molecular weight of about 500 to about 3000; and (c) 10 to 90 parts by weight, based on the total amount of compo- nents (b), (c), (d) and (e), of one or more crosslinkers, other than component (b), containing 3 to 8 hydroxyl groups and having a molecular weight of 92 to 1000, (d) 0 to 60 parts by weight, based on the total amount of components (b), (c), (d) and (e), of one or more isocyanate-reactive polyols, other than components (b) and (c), containing 2 to 6 hydroxyl groups and having a molecular weight of 60 to 10,000, (e) 0.05 to 3 parts by weight, based on the total amount of components (b), (c), (d) and (e), of a delayed action catalyst, and (f) 0 to 70% by weight, based on reinforced rigid polyurethane, of a reinforcing material.

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