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Aqueous emulsion coating for individual fibers of a cellulosic sheet providing improved wet strength
| Details |
Inventors: Hume, III, Robert M.;
Assignee: H. B. Fuller Company (St. Paul, MN)
Primary Examiner: Schofer; Joseph L.
Assistant Examiner: Reddick; J. M.
Attorney, Agent or Firm: Merchant, Gould, Smith, Edell, Welter & Schmidt
A basic aqueous emulsion composition that can be used as a treatment for cellulosic sheets or articles made of cellulosic fibers to provide improved water resistance by forming a discrete coating on the individual fibers that make up the sheet while not substantially limiting the compatibility of the treated sheet with aqueous glues, dyes or inks comprising a major proportion of water, a mixture of wax and rosin, an emulsion stabilizer and a chelating agent. |
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DETAILED DESCRIPTION I claim: 1.
A basic emulsion composition, that can provide water resistance to a cellulosic sheet while preserving its affinity with aqueous compositions, which comprises in an emulsion: (a) a major proportion of water; (b) an effective water resistance providing amount comprising about 0.
02 to 15 wt-% based upon the total emulsion composition of a mixture of a wax compound and a rosin compound; (c) an effective amount comprising about 0.
01 to 5 wt-% based upon the total emulsion composition of an emulsion stabilizer comprising the reaction product of a relatively strong basic component and a relatively weak acidic component; and (d) an effective amount comprising about 0.
01 to 10 wt-% of the total emulsion composition of a chelating agent resulting in the chelation of ionic species in the water and in the cellulosic sheet.
2.
The emulsion composition of claim 1 wherein the wax compound is a paraffin wax.
3.
The emulsion composition of claim 1 wherein the rosin compound comprises a hydrogenated or partially hydrogenated wood rosin.
4.
The emulsion composition of claim 1 wherein the emulsion has a pH greater than 8 and the relatively strong basic component of the emulsion stabilizer is ammonia, monoethanolamine, diethanolamine, triethanolamine, or mixtures thereof.
5.
The emulsion composition of claim 1 wherein the relatively weak acidic component of the emulsion stabilizer comprises a C.
sub.
8-24 fatty acid, an addition polymer having pendent carboxylic acid groups, or mixtures thereof.
6.
The emulsion composition of claim 1 wherein the chelating agent is ethylenediamine tetraacetic acid or a salt thereof.
7.
The emulsion composition of claim 1 wherein the basic emulsion additionally comprises a protective colloid.
8.
The emulsion composition of claim 7 wherein the protective colloid is polyvinyl alcohol.
9.
The emulsion composition of claim 1 which additionally comprises an antifoam agent, a preservative, a dye, or mixtures thereof.
10.
The emulsion composition of claim 4 having a pH of about 8 to 10
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