| 摘要 |
A preformed stabilizer composition based on a precursor stabilizer obtainable by reacting a silicon atom containing compound of formula RnSiX4-n or RnSi((-OSi(R1)2)pX)4-n wherein the R groups are independently saturated or unsaturated hydrocarbyl groups, at least one R group being an olefinically unsaturated hydrocarbyl group; R1 is a hydrocarbyl group, X is a C1 to C10 alkoxy group, n is an integer from 1 to 3 and p is an integer greater than zero, with a polyether polyol having an average molecular weight in excess of 400 and a hydroxyl number in the range 20 to 280 is used to manufacture polymer polyol compositions having a combination of (a) high polymer content, from 30 weight percent to 60 weight percent, (b) lower viscosities, typically less than 9,000 centipoise, (c) product stability such that 100 percent passes through a 150 mesh screen, and (d) up to 100 percent of the polymer solids content passes through a 700 mesh screen.
|
