Water blown polyurethane integral skin foam having improved...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 18/10 (2006.01) C08G 18/66 (2006.01) C08G 18/76 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01) C08J 9/08 (2006.01)

Patent

CA 2207468

This invention relates to a process for preparing integral skin foams from a specific reaction mixture. The isocyanate of this reaction mixture comprises a stable, liquid MDI based prepolymer containing an allophanate-modified MDI, and having an NCO content of 5 to 30%. This isocyanate comprises the reaction product of an allophanate-modified MDI and a polyether polyol. Integral skin foams prepared from these allophanate-modified isocyanate prepolymers exhibit improved properties and improved resistance to Taber abrasion in comparison to conventional isocyanate prepolymers.

Procédé pour obtenir des mousses à peau intégrée à partir d'un mélange réactionnel spécifique. L'isocyanate de ce mélange réactionnel comprend un prépolymère liquide stable à base de MDI, renfermant un MDI modifié par un allophanate, avec 5 à 30 % de NCO. Cet isocyanate renferme le produit de réaction d'un MDI modifié par un allophanate et un polyéther-polyol. Les mousses à peau intégrée préparées à partir de ces prépolymères d'isocyanate modifiés par des allophanates possèdent, comparativement aux prépolymères d'isocyanate classiques, des propriétés améliorées, notamment une meilleure résistance à l'abrasion de Taber.

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