Graft polyols with a bimodal particle size distribution and...

Details Graft polyols with a bimodal particle size distribution and... Graft polyols with a bimodal particle size distribution and...

C - Chemistry, Metallurgy

08

G

C08G 18/40 (2006.01) C08G 18/63 (2006.01) C08G 18/65 (2006.01) C08G 18/69 (2006.01) C09J 175/14 (2006.01)

Patent

CA 2481697

The invention relates to graft polyols with a bimodal particle size distribution and a total solid content of between 5 and 65 wt. %. Said polyols contain small particles with a particle diameter of between 0.05 and 0.7 µm and large particles with a particle diameter of between 0.4 and 5.0 µm, whereby the peaks of the large and small particles measured during a representation according to the light-scattering analysis method do not overlap. The total solid content with the defined particle sizes consists of a volumetric fraction of between 5 and 45 % small particles and a volumetric fraction of between 95 and 55 % large particles, said volumetric fractions totalling 100 %. The invention also relates to a method for producing graft polyols of this type and to the use thereof for producing polyurethanes.

L'invention concerne des polyols greffés à répartition granulométrique bimodale et à teneur totale en substance solide de 5 à 65 % en poids. Ces polyols contiennent des petites particules dont le diamètre mesure entre 0,05 et 0,7 µm et des grosses particules dont le diamètre mesure entre 0,4 et 5,0 µm, les crêtes des petites et des grosses particules mesurées lors de la représentation selon la méthode d'examen par diffusion de lumière ne se chevauchant pas. La teneur totale en substances solides de dimensions particulaires définies est constituée d'une part de volume de 5 à 45 % de petites particules et d'une part de volume de 95 à 55 % de grosses particules, ces parts de volume se complétant pour former 100 %. La présente invention porte également sur des procédés de production associés et sur l'utilisation de tels polyols greffés pour réaliser des polyuréthannes.

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