Reaction injection molding polyurea resin composition

C - Chemistry – Metallurgy – 08 – G

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C08G 18/32 (2006.01) C08G 18/50 (2006.01) C08G 18/66 (2006.01)

Patent

CA 2067563

A polyurea resin molding composition for reaction injection molding use which comprises (a) a polyoxy-alkylenepolyamine, (b) an aromatic polyamine and/or a xylylenediamine and tc) a polyisocyanate, wherein either one or both of components (a) and (b) have been modified by a Michael reaction with an unsaturated compound of the formula CH2 = C(R)-Y wherein R is H or CH3 and Y is an electron attracting group. The use of such modified polyamine(s) improves in-mold flow and green strength characteristics.

Une composition à base de résine de polyurée pour moulage par injection-réaction renferme les composés suivants: a) polyoxyalkylènepolyamine, b) polyamine aromatique et (ou) xylylènediamine et c) polyisocyanate, où l'un ou les deux composés a) et b) ont été modifiés par une réaction de Michael avec un composés insaturé de formule CH2 = C(R)-Y où R est H ou CH3 et Y est un groupe électrophile. L'utilisation de cette ou de ces polyamine(s) modifiée(s) améliore la fluiditié dans le moule et les caractéristiques de résistance initiale.

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