CPC C08G 63/183 (2013.01) [C08G 18/425 (2013.01); C08G 18/4247 (2013.01); C08G 18/4252 (2013.01); C08G 18/4255 (2013.01); C08G 59/62 (2013.01); C08G 63/199 (2013.01); C08G 63/672 (2013.01); C08L 67/02 (2013.01); C09J 167/02 (2013.01); C09J 175/06 (2013.01); C08G 2170/20 (2013.01)] | 20 Claims |
1. A semi-crystalline mixture of polyester polyols which recrystallises upon melting prepared by polycondensation of a reaction mixture comprising one or more dicarboxylic acids and one or more diols, wherein
(a) at least 50 mol % of the dicarboxylic acids are selected from saturated aliphatic dicarboxylic acids having an even number of at least 8 methylene groups which have neither a tertiary nor a quaternary carbon atom; and
(b) at least 40 mol % of the diols are selected from aliphatic diols that have at least one ether function and have no tertiary or quaternary carbon atom, and
the semi-crystalline mixture of polyester polyols have exothermic recrystallisation that occurs during an endothermic melting process before reaching their softening point or transition to the liquid phase.
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