| 摘要 |
The invention relates to a method for the preparation of a microcellular polyurethane elastomer which comprises interacting: (a) an organic diisocyanate (b) a polyester polyol having a hydroxyl number in the range 28-112 being a reaction product of an aliphatic dicarboxylic acid, a glycol and a di- or trialkanolamine of the formula: R-N(AOH)2 wherein A represents an alkylene radical containing 2-4 carbon atoms and R represents hydrogen or a further -AOH radical, (c) a difunctional chain extender, and (d) a blowing agent, the di- or tri-alkanolamine content of the polyester being at least 0.02 mole percent with respect to the total amount of glycol and di- or trialkanolamine. |
