Polyurethanes cured with amines and their preparation

Details Polyurethanes cured with amines and their preparation Polyurethanes cured with amines and their preparation

C - Chemistry, Metallurgy

08

G

C08G 18/66 (2006.01) C08G 18/10 (2006.01) C08G 18/32 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01) C08G 18/72 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2618964

Polyurethane prepolymers are described which are prepared from 2,4'-diiso- cyanate diphenylmethane (2,4'-MDI), a polyol component and an aliphatic diisocyanate. These prepolymers can be cured with aliphatic, cylcoaliphatic and/or aromatic amines to form a cured urethane elastomer. In comparison to cured urethane elastomers based on monomeric 2,4'-MDI, these prepolymers provide elastomers with extended pour life, i.e. they exhibit a slower rate of viscosity buildup after curative and prepolymer are mixed which results in a reduced propensity to crack during the curing process and gives the opportunity to cast larger parts. In comparison to polyurea/urethanes prepared from cured TDI-prepolymers and which optionally include H12-MDI, the prepolymers of the invention have better health and safety aspects.

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