Polymer obtainable by polycondensation or polyadduct formation from monomeric compounds, wherein accompanying use is made as monomeric compound of substituted 2-aryl-2-alkyl-1,3-propanediols of the formula I or substituted 2-cyclohexyl-2-alkyl-1,3-propanediols of the formula Ia or the alkoxylated derivatives of the formula I or of the formula Ia.
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