C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/152, 402/268
C08G 59/14 (2006.01) C08F 2/30 (2006.01) C08F 291/06 (2006.01) C08G 18/58 (2006.01) C08G 18/63 (2006.01) C08G 59/62 (2006.01) C08G 65/26 (2006.01)
Patent
CA 2033910
Very low viscosity polymer polyols having high styrene/acrylonitrile ratios and good stability may be achieved by the use of epoxy modified polyols as dispersants. The epoxy modified polyols useful as dispersants may be made by one of three methods: (1) adding the epoxy resin internally to the modified polyol, (2) capping or coupling a polyol not containing an epoxy resin with such a resin, and (3) providing the epoxy resin both internally to the polyol and as a cap or coupler. Epoxy modified polyols having a hydroxyl to epoxy ratio of about 8 or less, made by one of these techniques, are superior dispersants and provide polymer polyols having higher styrene contents, and improved stability and viscosity properties. In one aspect, the epoxy modified polyols contain a significant amount of high molecular weight polyol adducts; generally from about 5 to about 30 wt.% of materials having a GPC molecular weight of greater than 100,000: and at least greater than 80,000. Base polyols unmodified with an epoxy resin are used to make the polymer polyols.
Gastinger Robert G.
Hayes John E.
Arco Chemical Technology Inc.
Osler Hoskin & Harcourt Llp
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