Patent ID: 9062148
Filing Date: 2015-06-23
Classification: C08F,C08G

Abstract:
1. A method for producing a fine-particle-dispersed polyol (I) containing polymer fine particles (P) dispersed therein, the method comprising steps of: (1) polymerizing an ethylenically unsaturated monomer (b) in a polyol (a), in the presence of fine particles (P1) and a radical polymerization initiator (c), and optionally in the presence of at least one material selected from a dispersant (d) and a diluent (f) as required, so as to obtain a fine-particle-dispersed polyol intermediate (B2); and (n−1) polymerizing (b) in a fine-particle-dispersed polyol intermediate (B(n−1)), in the presence of (c), and optionally in the presence of at least one material selected from (d) and (f) as required, so as to obtain a fine-particle-dispersed polyol intermediate (Bn) or the fine-particle-dispersed polyol (I), where n represents an integer from 3 to 7, wherein the (P1) have a volume-average particle diameter (R1) in a range from 0.01 μm to 1.0 μm, a concentration of the (b) in the step (1) relative to a total weight of the (a), the (P1), the (b), the (c), the (d), and the (f) is in a range from 7 wt % to 40 wt %, in the step (1), the fine particles (P1) are dispersed in the polyol (a) preliminarily so that a concentration of the fine particles (P1) is in a range from 26 wt % to 90 wt % relative to a total weight of the fine particles (P1) and the polyol (a), in the steps of polymerizing the ethylenically-unsaturated monomer (b), the polymerization is further carried out in the presence of an active-hydrogen-containing compound (D) having a number-average molecular weight of 150 to 2,000 and having an aromatic ring, and the active-hydrogen-containing compound (D) comprises at least one compound selected from the group consisting of an aromatic-ring-containing ether (D1) and an aromatic-ring-containing ester (D2),