prov:value
| - A is an ethoxy or propoxy unit, m is a number greater than 0, preferably from approx. 0.5 to approx. 6, more preferably from approx. 0.5 to approx. 3, and M is a hydrogen atom or a cation, for example sodium, potassium, lithium, calcium, magnesium, ammonium or a substituted ammonium cation.
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