prov:value
| - Preferably, at least one water-soluble monomer has the following general formula: wherein X is selected from the group consisting of OM, OR4 and NR5R6, M is an alkali or alkaline earth metal ion or NH4 +, R1, R2, R3, R5, R6 and R7 are independently selected from the group consisting of H, CH3, CH2CH3, CH2CH2CH3, CH(CH3)2, CH2CH2CH2CH3, and CN, and OR4 is selected from the group consisting of OH, O
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