Patent ID: 6033524
Filing Date: 2000-03-07
Classification: D21H

Abstract:
A method for increasing retention and drainage of filling components in a paper making furnish in a paper making process comprising the steps of:a) making a slurry of filling components and adjusting the pH of said slurry so that said pH of said slurry is from about 4.5 to about 6.5;b) treating said slurry with from about 0.003 to about 2.0% by weight based on total solids of a compound selected from the group consisting of phenol-formaldehyde resins, tannin extracts, naphthol-formaldehyde condensates, poly(para-vinyl phenol) and mixtures thereof to form a pretreated filling components slurry;c) adding to said furnish said pretreated slurry of step b); and then,d) adding to said furnish from about 0.003 to about 0.5% by weight based on total solids in the slurry of a polymeric flocculant, said flocculant having a molecular weight of at least about 500,000, and said flocculant being selected from the group consisting of cationic and anionic polymers;whereby retention and drainage of said filling components in said paper making furnish is increased.