C[O:2][C:3](=[O:8])[C:4]([CH2:6][OH:7])=[CH2:5]>C(O)(=O)C=C>[OH:7][CH2:6][C:4](=[CH2:5])[C:3]([O-:8])=[O:2].[C:3]([O-:8])(=[O:2])[CH:4]=[CH2:5]A polymer was prepared by copolymerisation of 2-hydroxymethylacrylate methyl ester prepared as described in Example 1 (2 g) and acrylic acid (6.5 g). The polymerisation was carried out by the procedure described in Example 1. The yield was 8.0 g.
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