Graft polyols prepared by a continuous process

Details Graft polyols prepared by a continuous process Graft polyols prepared by a continuous process

C - Chemistry, Metallurgy

08

F

C08F 283/00 (2006.01) C08F 290/06 (2006.01)

Patent

CA 2483208

Disclosed is a process for preparation of final graft polyols via a continuous process. In addition, a final graft polyol formed by the process is disclosed. The process includes the steps of reacting a plurality of ethylenically unsaturated monomers and a reaction moderator with a macromer having induced unsaturation in the presence of a carrier polyol, a free radical polymerization initiator, and a first graft polyol. The process provides for the preparation of a final graft polyol having a solids level of from 30 to 70 % in a continuous process. The final graft polyol produced by the process has a lower viscosity over a range of solids levels, a reduced amount of very large irregularly shaped particles, a reduced viscosity change in response to a change in reaction temperature compared to a typical graft polyol, a reduced tendency to foul the continuous reactor, and a braoder particle size distribution compared to an identical graft polyol prepared by a semi-batch process.

L'invention porte sur un procédé d'obtention de polyols greffés finaux par un procédé continu, et sur les polyols ainsi obtenus. Ledit procédé consiste à faire réagir plusieurs monomères non saturés en éthylène et un modérateur de réaction, avec un macromère à insaturation induite, en présence d'un polyol support, d'un initiateur de polymérisation des radicaux libres, et d'un premier polyol greffé. Ledit procédé permet d'obtenir en continu un polyol greffé final présentant une teneur en solides comprise entre 30 et 70 %, ainsi qu'une viscosité plus basse sur la plage des niveaux solides, qu'une quantité réduite de très grosses particules de forme irrégulière, qu'une variation réduite de viscosité par rapport aux polyols greffés usuels suite à une modification de la température de réaction, qu'une tendance réduite à encrasser le réacteur en continu, et qu'une distribution en taille des particules plus étendue que celle de polyols identiques obtenus par le procédé par demi-lots.

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