Flexible polyurethane foam

Details Flexible polyurethane foam Flexible polyurethane foam

C - Chemistry, Metallurgy

08

G

C08G 18/40 (2006.01) C08G 18/63 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2745538

A flexible polyurethane foam having a density of < 100 kg/m3 comprises a reaction product of a polyisocyanate composition and an isocyanate-reactive composition. The polyisocyanate composition comprises a polymeric MDI component and a monomeric MDI component comprising 2,4'-MDI that is present in the monomeric MDI in an amount > 35 parts by weight of the 2,4'-MDI based on 100 parts by weight of the monomeric MDI. The isocyanate- reactive composition comprises a primary hydroxyl- terminated graft polyether polyol and a second polyol different from the primary hydroxyl-terminated graft polyether polyol. The primary hydroxyl-terminated graft polyether polyol comprises a carrier polyol and particles of co-polymerized styrene and acrylonitrile. The carrier polyol has a weight average molecular weight of > 3,500 g/mol.

Cette invention concerne une mousse de polyuréthanne souple ayant une densité < 100 kg/m3 et comprenant le produit réactionnel d'une composition de polyisocyanate et d'une composition réactive aux isocyanates. La composition de polyisocyanate selon l'invention comprend un composant MDI polymère et un composant MDI monomère comprenant un 2,4'-MDI qui est présent dans le MDI monomère en une quantité > 35 parties en poids de 2,4'-MDI pour 100 parties en poids de MDI monomère. La composition réactive aux isocyanates comprend un polyéther polyol primaire greffé à terminaisons hydroxyle et un second polyol différent du polyéther polyol primaire greffé à terminaisons hydroxyle. Le polyéther polyol primaire greffé à terminaisons hydroxyle comprend un polyol support et des particules de styrène et d'acrylonitrile copolymérisées. Le polyol support a un poids moléculaire moyen en poids > 3 500 g/mol.

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