Patent ID: 8362117

Claim:
A method for stabilizing polycarboxylates comprising: elevating a temperature of a polycarboxylate polymer and an associated inorganic powder, wherein the polycarboxylate polymer comprises: at least one acid unit; and at least one unit that comprises polyoxyalkylene groups, wherein the inorganic powder is a hydraulic binder comprising a Portland cement or an aluminous cement, wherein the polycarboxylate polymer is added in liquid form to the inorganic powder; and mixing the polycarboxylate polymer with at least one antioxidant before, during and/or after the elevating, wherein the at least one antioxidant is selected from the group consisting of: substituted phenols, sterically inhibited phenols, hydroquinones, sterically inhibited aromatic amines, diarylamines, arylamine-ketone condensation products, organosulfur compounds, dialkyldithiocarbamic acids, dialkyldithiophosphites, organophosphorus compounds, phosphites, phosphonites, tocopherols, organophosphorus compound derivatives, gallic acid, gallic acid derivatives, vanillin, salts, and any mixtures thereof.