High performance polyurethane base resins

Details High performance polyurethane base resins High performance polyurethane base resins

C - Chemistry, Metallurgy

08

G

C08G 18/78 (2006.01) C08G 18/12 (2006.01) C08G 18/42 (2006.01) C08G 18/79 (2006.01) C09J 175/06 (2006.01)

Patent

CA 2065225

ABSTRACT OF THE DISCLOSURE Disclosed are polyurethane base resins, and polyurethane composites and adhesive compositions formed using the base resins. The polyurethane base resins are formed by reacting a polycarbodiimide-modified 4, 4'-diphenylmethane diisocyanate with a mixture of the following polyols: (a) a hydroxyl-terminated, linear, saturated liquid copolyester diol having a glass transition temperature of at most -10°C and at least -60°C; and (b) a homopolyester polyol that is a ring-opened polymer of a cyclic ester. The polyurethane composites include typical active hydrogen-containing species that will react with isocyanates and promote curing, in addition to the polyurethane base resin. The polyurethane adhesive compositions, which are thermosetting, include the cured polyurethane base resin, cured by exposure to moisture or any other applicable curing mechanism. The adhesive compositions have improved performance (e.g., tensile strength and adhesion) at elevated service temperatures, and are suitable for high performance automotive structural bonding applications. -23-

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