Cationic and anionic lignin amine sizing agents
AssigneeWestvaco Corporation
InventorsPeter Schilling, Patti E. Brown
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Abstract
Lignin amines are disclosed which are characterized by high nitrogen content and are water soluble at both alkaline and acidic pH values. The lignin amines have utility as flocculants, filtration aids, precipitants, scale inhibitors, asphalt emulsifiers, fluid loss additives, oil well cement additives, corrosion inhibitors, retention aids, cationic dispersants, and tall oil pitch emulsifiers.
Claims12
In a method for sizing wood pulp under substantially neutral pH conditions, the improvement of enhancing size retention on the pulp comprising sizing the wood pulp in the presence of a lignin derivative prepared by reacting lignin with an aldehyde, or an aldehyde producing substance, and a polyamine.
Dependencies are inferred from the claim text.