SOFT POLYURETHANE FOAM EXCELLENT IN COMPRESSIVE PERMANENT SET, VIBRATION PROOFNESS AND COMPRESSION CREEP PROPERTY

摘要

PROBLEM TO BE SOLVED: To provide a soft polyurethane foam excellent in compressive permanent set, vibration proofness and compression creep property.SOLUTION: There is provided a soft polyurethane foam excellent in compressive permanent set, vibration proofness and compression creep property and manufactured from a composition by reacting following (A) a polyol component and (B) a polyisocyanate component. (A) the polyol component consists of a mixture of (A-1) polyol having functional group number of 2.0 to 3.0, hydroxyl group number of 20 to 170 and a hydroxyl group at a terminal, (A-2) a hyper branch polymer having functional group number of 4 or more, hydroxyl group value of 380 or more and an active hydroxyl group at a terminal and (A-3) a low molecular polyol having functional group number of 2.0 to 3.0 and hydroxyl group value of 900 to 2000, (B) the polyisocyanate component consisting of diphenylmethane diisocyanate or a derivative therefor and (C) water.SELECTED DRAWING: None