Patent ID: 6562195
Filing Date: 2003-05-13
Classification: C08B,D21C,D21H

Abstract:
In the method of making paper having wet strength, temporary wet strength and dry strength properties, the improvement comprising using as the pulp stock or a component of the pulp stock an aldehyde modified cellulosic material having an aldehyde content of about 1 to 20 mmole/100 g of cellulose, said cellulosic material having been prepared by oxidizing cellulose or cellulose pulp in an aqueous solution with an oxidant having an equivalent oxidizing power of up to 5.0 g of active chlorine per 100 g of cellulose and an effective mediating amount of nitroxyl radical, the reaction being carried out at a pH of about 8.0 to 10.5 and a temperature of from about 5 to 50Â° C.