RECYLING OF PAPER

摘要

A de-inking composition is disclosed consisting substantially of: (A) a salt of a fatty acid of the formula: R-COO-M wherein R represents one or more hydrocarbon chains selected from the class consisting of saturated and/or unsaturated hydrocarbons; and M represents a metal selected from the class consisting of Na and K; said fatty acid salt being present in an amount between 5% and 32% with respect to the weight of the entire composition; (B) a non-ionic ethoxylated and/or propoxylated surfactant of the formula: wherein: Y is either H or CH3; R1O represents the hydrophobic moiety of the molecule and is derived from a compound selected from the class consisting of alkylphenols of formula saturated primary fatty alcohols of formula R''-CH2OH; saturated secondary fatty alcohols of formula R''' fatty acids of the formula Rv-COOH; and mixtures thereof, wherein R', R'', R''', Riv and Rv are alkyl chains; and n is a number between 2 and 40; said non-ionic surfactant being present in an amount between 5% and 25% by weight of the entire composition; (C) an anionic surfactant selected from the class consisting of sulphonates of the formula R2-SO3-M'; sulphates of formula R3-O-SO3-M' and mixtures thereof, wherein: R2 is selected from the class consisting of linear paraffin chains, olefine chains, and alkylaryl chains; R3 is a paraffin chain; and M' is selected from the class consisting of Na, K, NH4 and mono-, di- and tri-substituted alkylamines; said anionic surfactant being present in an amount between 2% and 8% with respect to the weight of the entire composition; (D) a sodium-carboxylmethyl-cellulose in an amount between 1% and 5% with respect to the weight of the entire composition; and (E) an alkaline inorganic salt selected from the class consisting of metasilicate, disilicate, carbonate, borate and polyphosphates, said alkaline inorganic salt being present in an amount between 30% and 80% of the entire composition; the percentages of the components (A), (B), (C), (D) and (E) totaling essentially 100%. A process of de-inking is also disclosed.