摘要 |
Disclosed are polyester polyols liquid at 25 DEG C., having an average functionality of from 2 to 3, a hydroxyl number of from 25 to 400, an acid number smaller than 10 and a viscosity at 25 DEG C. of from 200 to 10,000 mPas, which contain in bonded form units having at least one of the structures -O-CH2-CH(CH3)-CH2-CH2-CH2-O-, -O-CH2-CH(C2H5)-CH2-CH2-O-, -OC-CH(CH3)-CH2-CH2-CO-and -OC-CH(C2H5)-CH2-CO- which are prepared by the polycondensation or transesterification of 2-methyl-1,5-pentanediol, 2-ethyl-1,4-butanediol, 2-methyl-glutaric acid and/or 2-ethyl succinic acid or their derivatives, optionally while using other organic polycarboxylic acids and multivalent aliphatic alcohols and are useful for preparing non-cellular or cellular polyurethane plastics or polyurethane-polyurea plastics.
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