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Selective retention of filling components and improved control of sheet properties by enhancing additive pretreatment
| Details |
Inventors: Pruszynski, Przemyslaw; Jakubowski, Regina; Armstrong, John R.; Rosencrance, Scott W.;
Assignee: Nalco Chemical Company (Naperville, IL)
Primary Examiner: Fortuna; Jose
Assistant Examiner:
Attorney, Agent or Firm: Brumm; Margaret M., Breininger; Thomas M.
A method for increasing retention and drainage of filling components in a paper making furnish in a paper making process comprising the steps of: making a slurry of filling components, treating the slurry with from about 0.003% to about 2.0% by weight based on total solids of a phenolic enhancer to form a pretreated filling components slurry, adding to the furnish the pretreated slurry and adding to the furnish from about 0.003 to about 0.5% by weight based on total solids in the slurry of a polymeric flocculent, whereby retention and drainage of filling components in the paper making furnish is increased. A preferred enhancer is a condensate of phenol and formaldehyde and preferred flocculants contain acrylamide, methacrylamide, and/or N-vinylformamide. The method provide important benefits in many papermaking applications, in which desirable filling components are retained in the final sheet, while undesirable filling components, such as ink and dye particles present in a recycled papermaking furnish, are not retained. |
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DETAILED DESCRIPTION We claim: 1.
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.
2.
The method of claim 1 wherein said filling components are selected from the group consisting of: calcium carbonates, clay, silica, titanium dioxide, magnesium oxide, gypsum, talc, hydrated aluminum oxide, magnesium silicate and mixtures thereof.
3.
The method of claim 1 wherein from about 0.
007 to about 1.
0% by weight based on total solids in the furnish of the compound selected from the group consisting of phenol-formaldehyde resins, tannin extracts, naphthol-formaldehyde condensates, poly(para-vinyl phenol) and mixtures thereof is added in step b).
4.
The method of claim 1 wherein from about 0.
02 to about 0.
5% by weight based on total solids in the furnish of the compound selected from the group consisting of phenol-formaldehyde resins, tannin extracts, naphthol-formaldehyde condensates, poly(para-vinyl phenol) and mixtures thereof is added in step b).
5.
The method of claim 1 wherein the paper making furnish is selected from the group consisting of fine paper, board, and newsprint paper making furnishes
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Manufacturing Materials 
