| 摘要 |
<p>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 C¿1? 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 % passes through a 150 mesh screen, and (d) up to 100 % of the polymer solids content passes through a 700 mesh screen.</p> |
