D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/2, 8/82
D21C 9/16 (2006.01) D21C 3/04 (2006.01)
Patent
CA 1110018
Abstract An improved peroxide based brightening and deligni- fying solution and process for lignocellulosic pulp, charac- terized by selective delignification and pulp viscosity re- tention, the process comprising maintaining a pulp slurry at a temperature between 40°C and 120°C for 0.5 hours to 8 hours, the slurry comprising lignocellulosic pulp; from 0.1% to 20% by weight based on O.D. pulp of peroxide; from 0.1% to 10% by weight based on O.D. pulp of a metal containing additive whose metallic portion is selected from the group consisting of tin, titanium, and vanadium; and sufficient acid to main- tain the pH of the slurry between about 1 and about 7. In a preferred embodiment of this invention a tin additive is employed and the partially delignified and brightened pulp is further bleached with the unconsumed peroxide by adjusting the pH of the slurry to between 8 and 12 and maintaining the temperature of the slurry from 40°C to 90°C for 0.1 to 4 hours.
319918
Gowling Lafleur Henderson Llp
International Paper Company
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