Activating plasticizer for urethane prepolymers and complex...

Details Activating plasticizer for urethane prepolymers and complex... Activating plasticizer for urethane prepolymers and complex...

C - Chemistry, Metallurgy

08

G

402/152, 400/742

C08G 18/10 (2006.01) C08G 18/06 (2006.01) C08K 5/06 (2006.01) C08K 5/103 (2006.01) C08L 75/08 (2006.01)

Patent

CA 1231193

Abstract of the Disclosure ACTIVATING PLASTICIZER FOR URETHANE PREPOLYMERS AND COMPLEX OF ALKALI METAL SALT WITH 4,4'-METHYLENEDIANILINE Storable polyproplyene ether polyurethane compositions composed of (a) a prepolymer of a polypropylene ether glycol and sufficient organic polyisocyanate to give preferably an excess of about 3 to 15 percent NCO in said prepolymer with the proviso that the free NCO is obtained from methylenedi-p-phenyl diisocyanate and (b) a complex of an alkali metal salt with 4,4'-methylenedianiline (MDA), said composition being relatively inactive at temperatures below 100°C, but being heat activatible at much higher temperatures to effect a cure. The improved composition wherein a catalyst is present in said composition which effectively lowers the cure temperature, said catalyst being a pseudocrown ether containing radicals having the formula ?y-CH2-CH2-?n with y being nitrogen, sulfur or oxygen and n has values sufficient to form the crown structure, viz at least 3 or more.

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