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The polyester glycols are prepared from aliphatic diols and aliphatic dicarboxylic acids by conventional procedures: wherein R is a straight-chain or branched-chain alkylene radical containing from 2 to 20 carbon atoms and R is a straight-chain or branched-chain alkylene radical containing from 0 to 20 carbon atoms and x is an integer selected to give a polyester having a molecular weight of about
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