Cellular polyurethane elastomers

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/38 (2006.01) C08G 18/10 (2006.01) C08J 9/04 (2006.01)

Patent

CA 2236597

A cellular polyurethane elastomer is produced by reacting: (a) an isocyanate component comprising methylenebis(phenyl isocyanate)(MDI), tolylene diisocyanate (TDI), or both thereof, with (b) compounds with at least two isocyanate-reactive hydrogen atoms and (c)4,4'-methylenebis (3-chloro-2,6- dialkylaniline)or a mixture of 4,4'-methylenebis (3-chloro-2,6- dialkylaniline)with one or more aromatic, aliphatic or cycloaliphatic diamines as chain extending agents, possibly together with an additional polyol and (d) a blowing agent, in the presence of usual catalysts and other optional additives. These cellular polyurethane elastomers are useful to produce moulded bodies which are subjected to high dynamic and thermal stresses.

L'invention concerne un élastomère polyuréthane cellulaire s'obtenant par réaction: a) d'un constituant isocyanate, contenant du méthylène-bis-phényl-isocyanate (MDI) et/ou du diisocyanate de toluylène (TDI), avec b) des composés renfermant au moins deux atomes d'hydrogène réactifs avec les isocyanates et c) du 4,4'-méthylène-bis-(3-chlore-2,6-dialkylaniline) ou bien un mélange de 4,4'-méthylène-bis-(3-chlore-2,6-dialkylaniline) avec une ou plusieurs diamines aromatiques, aliphatiques ou cycloaliphatiques comme allongeurs de chaîne, éventuellement conjointement avec un polyol supplémentaire et d) un agent moussant, en présence des catalyseurs usuels et éventuellement d'additifs additionels. Ces élastomères polyuréthane cellulaires sont utiles pour produire des articles moulés soumis à de fortes contraintes dynamiques et thermiques.

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