prov:value
| - The process of claim 6 wherein the ballasting group corresponds to general formula: ##STR5## wherein X is an oxygen atom or a sulfur atom; R.sub.2 is a branched or linear alkylene group; R.sub.1 is a hydrogen atom, a halogen atom, an alkylgroup, an aryl group, a heterocyclic group, an aralkylic group, an aryloxy group, a hydroxy group, an acyloxy group, an alkoxycarbonyl group, an aryloxycarbonyl
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