| abstract |
A multi-branched polyether polyol obtained by ring-opening a hydroxyalkyl oxetane (a1) with a monofunctional epoxy compound (a2), and has a primary hydroxyl group (H1) and a secondary hydroxyl group (H2) in its molecular structure, The multi-branched polyether polyol is characterized in that the number average molecular weight (Mn) of the multi-branched polyether polyol is 1,000 to 4,000, and the hydroxyl value is 150 to 350 mg ยท KOH / g. n n Hydroxyalkyloxetane, monofunctional epoxy compound, multibranched polyether polyol |