Fmc Corporation

Dean S Thorp

Robert H Tieckelmann

Frank E Caropreso

James L Manganaro

William A Hills

Basil A Guiliano

Donald Lapham, Iii

A method for repulping a wet strength paper is disclosed. Wet strength paper, which contains a wet strength resin, is agitated in water to form an aqueous slurry. An effective amount of a composition that contains a dry mixture of a persulfate and a base in the range of 90:10 to 10:90 is added either before or during agitation, and the slurry heated to produce pulp product for paper manufacture. The persulfate/base combination is capable of breaking down the wet strength resin and adjusting or maintaining the pH at a predetermined level without additional chemical treatment.

Persulfate mixtures for repulping wet strength paper

Repulping and/or decolorizing formulations and mixtures which include a catalytic amount of a salt of a metal such as copper, iron, silver, or nickel; a persulfate; and from 0-10% saccharide. Formulations containing a carbonate, sesquicarbonate or bicarbonate for adjusting pH are preferred. A method of repulping and/or decolorizing broke, whether containing wet strength resin or not, using the formulations or mixtures of the ingredients in the formulations.

Method for repulping and/or decolorizing broke using persulfate/metal

Persulfate/metal mixtures for repulping and/or decolorizing paper

Composition and method of making bicaroate and bicaroate/dipersulfate mixtures which are stabilized, in dry form, with a coherent coating of sodium borosilicate. The borosilicate is formed in situ by the reaction of a sodium silicate and a sodium metaborate.

Stable monopersulfate triple salt and its method of preparation

A composition containing a persulfate and a carbonate, a bicarbonate or sesquicarbonate, which composition is suitable for oxidizing wet strength resin based broke used in wet strength paper. The combination decreases the time required for effectively repulping broke from such paper. Additionally, the combination is a single product capable of beaking down the wet strength resin and adjusting or maintaining pH at a predetermined value without additional chemical treatment.

Persulfates are used to provide water clarity when organic sanitizers such as biguanides are utilized for sanitizing recreational waters. Persulfate applications of 2 ppm or more can be used. Additionally, maintenance applications of the persulfate or the bisulfate can be used.

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Levittown, PA, United States of America

Dean S Thorp