| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyurethane foam excellent in viscoelastic property and air permeability.SOLUTION: There is provided a reaction system for preparing a viscoelastic foam polyurethane consisting of (a) a polyisocyanate component, (b) an isocyanate component, (c) water and (d) a catalyst. There is provided a polyurethane foam where (b) contains 35 to 74 wt.% of (i) (PO-rich) polyol rich in one or more propylene oxide having total number average equivalence of 200 to 500 and 70 wt.% or more of polyoxyethylene content, 24 to 50 wt.% of (ii) (EO-rich)polyol rich in one or more ethylene oxide having total number average equivalence of 1,000 to 2,800 and 70 wt.% or more of polyoxyethylene content and 2 go 10 wt.% of (iii) (BO-rich) polymer rich in one or more butylene oxide having number average equivalence of 2,000 or more and 70 wt.% or more of polyoxybutyl content.SELECTED DRAWING: None |
