| abstract |
PROBLEM TO BE SOLVED: To find a method for producing a polymer polyol having a low viscosity even when the particle size of polymer particles dispersed in a polyol is small and having excellent resin properties when used in a polyurethane resin. A monomer-containing mixed solution (A) comprising a polyol (a), an ethylenically unsaturated monomer (d), a radical polymerization initiator (k), a dispersant (e), and a base polymer polyol (h). A polymer polyol intermediate (B) is obtained by polymerization, and the step of polymerizing (d) in the same manner using (B) as (h) in the next step is repeated 3 to 7 times [where (h) is the second Used after the step], a method for producing a polymer polyol, wherein the concentration (mass%) of (d) in (A) before the start of polymerization in each step is 7 to 25, in (h) A polymer polyol (I) having a polymer content (mass%) of 7 to 50 and a polymer content (mass%) in the obtained polymer polyol (I) of 30 to 65 ) Manufacturing method. [Selection figure] None |