Processes and compositions for repulping wet strength paper and

Details Processes and compositions for repulping wet strength paper and Processes and compositions for repulping wet strength paper and

1996-09-16

1999-05-18

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 78, 162191, D21C5/02

Patent

active

059048085

ABSTRACT:
A process of repulping paper a product comprising cellulose fibers, comprising forming an aqueous suspension of paper product to be repulped and an oxidizing agent comprising at least one persulfate salt, and maintaining the pH of the aqueous suspension in a range of from about 2.3 to about 6.5. The process is preferably conducted in the presence of preferred buffer systems. Compositions for conducting such processes are also provided.

REFERENCES:
patent: 2926116 (1960-02-01), Keim
patent: 3427217 (1969-02-01), Miller
patent: 5447602 (1995-09-01), Sajbel et al.
Henk A97 95-106876/14, Polymer Applications-p. 14, week 9514 (abstract of WO 95//06157).
Thorp, et al., "Chlorine-Free Wet Strength Paper Repulping and Decolorizing with Activated Persulfates" 1995 Papermakers Conference: Proceedings (TAPPI); 163-168 (Apr. 26, 1995; TAPPI Press).
Espy, et al., Proceedings of the TAPPI Papermakers Conference-1990, pp. 147-149.
Espy, et al., "Persulfates as Repulping Reagents for Neutral/Alkaline Wet-Strength Broke", TAPPI J., vol.: 76, No.: 2, pp. 139-142 (1993) CA.
Hercules Incoporated KYBREAK* 100 Repulping aid Material Safety Data Sheet dated May 28, 1993.
Hercules Incorporated KYBREAK* 200 Repulping aid Material Safety Data Sheet dated Jan. 10, 1994.
Hercules Incorporated KYBREAK* 300 Repulping aid Material Safety Data Sheet dated May 3, 1995.
Hercules Incorporated Product Product Data sheet, entitled "KYBREAK.TM. 100 Repulping Aid For Paper and Paperboard Containing Alkaline-Curing, Wet-Strength Resins".
Hercules Incorporated Product Data Sheet, entitled, "Kybreak.TM. 200 Repulping Aid For Paper and Paperboard Containing Alkaline-Curing, Wet Strength Resins".
Hercules Incorporated Product Data sheet, entitled, "KYBREAK.TM. 300 Repulping Aid For Paper and Paperboard Containg Alkaline-Curing, Wet-Strength Resins".
Laporte Organics Product Specification sheet, entitled, "Sodiumpersulfate" and a verified English translation thereof.
Thirkettle, Broke Handling, Paper Review of the Year, Johnsen, Jorgenson & Wettre, Ltd., 1974 (pp. 126-136).

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