Viscoelastic polyurethane foams

Details Viscoelastic polyurethane foams Viscoelastic polyurethane foams

C - Chemistry, Metallurgy

08

G

C08G 18/28 (2006.01)

Patent

CA 2398507

Viscoelastic foams and a process for making them are disclosed. The foams are produced with a unique isocyanate--reactive mixture that includes a low equivalent weight polyol and from about 15 to about 70 wt % of a polyester or polyoxyalkylene monol having a number average equivalent weight greater than about 1000. The monol is the key to formulating excellent viscoelastic foams over a broad range of processing conditions and isocyanate indices. A"reactive" monol gives TDI-based viscoelastic foams with improved "hand feel" and reduced levels of residual toluenediamines.

La présente invention concerne des mousses viscoélastiques et un processus de fabrication de celles-ci. On produit ces mousses avec un seul mélange de réactif aux isocyanates qui comprend un polyol de faible masse moléculaire d'équivalence et d'environ 15 % à environ 70 % d'un polyester de polyoxyalkylène monol de masse moyenne en nombre d'équivalence supérieur à environ 1000. Ce monol est la clé qui permet de préparer d'excellentes mousses viscoélastiques sur une grande plage de conditions de traitement et d'indices d'isocyanate. Un monol </= réactif >/= donne des mousses viscoélastiques à base de TDI au toucher amélioré et à niveaux de toluènediamines réduit.

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