Additive for controlling secondary contaminates

摘要

An additive for controlling the detrimental effects of secondary recycled contaminants in the papermaking process. In the preferred embodiment, the additive includes a first low molecular weight, cationic water-soluble polymer and a second low molecular weight, cationic, water-soluble polymer, wherein the first low molecular weight, cationic, water-soluble polymer and the second low molecular weight, cationic, water-soluble polymer are co-reacted. In the preferred embodiment, the effective amount of the additive is determined by measuring about a 50 PPM reduction in soluble charge of the liquid base after adding the additive to the liquid base. In the most preferred embodiment, the reduction in soluble charge is between about 50 and 150 PPM as measured by determining the electrophoretic mobility of the liquid base with and without the additive. In the preferred embodiment, the first low molecular weight, cationic, water-soluble polymer is a di-ammonium chloride polymer, such as DADMAC, and the second low molecular weight, cationic, water-soluble polymer is a polyacrylamide. The molecular weight of the additive is controlled to be less than about 25,000 cps but greater than about 18,000 cps.