| http://www.w3.org/ns/prov#value | - In another preferred embodiment of the process according to the invention a PVDF-, CTFE/VF- or a PVDF-CTFE/VF-membrane is treated with a solution comprising hydroxyalkylcellulose in the presence of an inorganic base as catalyst, such as NaOH, optionally a cross linking agent, such as a compound with the general formula R3 --(CHOH--CH2 --X)n, where X is a halogen atom, preferably chlorine, R3 is an
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