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| Label |
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Aqueous dispersions of hydrophobic material
| Details |
Inventors: Hallstrom, Hans; Frolich, Sten; Lindgren, Erik; Sikkar, Rein;
Assignee: Akzo Nobel N.V. (Arnhem, NL)
Primary Examiner: Lovering; Richard D.
Assistant Examiner:
Attorney, Agent or Firm: Mancini; Ralph J., Parker; Lainie E.
The invention relates to an aqueous dispersion containing a dispersant and a disperse phase containing a hydrophobic material, the dispersant comprising an anionic compound having a molecular weight less than 50,000 and being selected from the group consisting of carbon-containing compounds and silicon-containing compounds, and a cationic organic compound having a molecular weight less than 50,000. The invention further relates to the preparation and use of the dispersion in the production of paper. The invention also relates to a substantially water-free composition containing a hydrophobic material, an anionic compound having a molecular weight less than 50,000 and being selected from carbon-containing compounds and silicon-containing compounds, and a cationic organic compound having a molecular weight less than 50,000, as well as it use in the preparation of an aqueous dispersion. |
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DETAILED DESCRIPTION We claim: 1.
Aqueous dispersion containing an anionic dispersant and a disperse phase containing a hydrophobic sizing agent wherein the dispersant comprises (a) an anionic polyelectrolyte having a molecular weight of less than 50,000 selected from the group consisting of carbon-containing compounds, silicon-containing compounds and mixtures thereof, and (b) a cationic organic polyelectrolyte or cationic organic surfactant having a molecular weight of less than 50,000.
2.
The dispersion of claim 1, wherein the anionic polyelectrolyte and the cationic organic polyelectrolyte or cationic organic surfactant have a molecular weight less than 20,000.
3.
The dispersion of claim 1, wherein the anionic polyelectrolyte is organic.
4.
The dispersion of claim 1, wherein (b) is a cationic organic surfactant.
5.
The dispersion of claim 1, wherein (b) is a cationic organic polyelectrolyte.
6.
The dispersion of claim 5 wherein said cationic and anionic polyelectrolytes each have a molecular weight of less than 10,000.
7.
Aqueous dispersion containing a cationic dispersant and a disperse phase containing a hydrophobic sizing agent wherein the cationic dispersant comprises (a) an anionic surfactant or anionic polyelectrolyte having a molecular weight of less than 50,000 selected from the group consisting of carbon-containing compounds, silicon-containing compounds and mixtures thereof, and (b) a cationic organic polyelectrolyte having a molecular weight of less than 50,000.
8.
The dispersion of claim 7, wherein said cationic organic polyelectrolyte has a molecular weight of less than 10,000.
9.
The dispersion of claim 7, wherein (a) is an anionic polyelectrolyte, and said anionic polyelectrolyte and cationic organic polyelectrolyte each have a molecular weight of less than 10,000.
10.
The dispersion of claim 1, wherein the content of hydrophobic sizing agent is at least 20% by weight.
11.
The dispersion of claim 1, wherein the hydrophobic sizing agent is a cellulose-reactive sizing agent
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Manufacturing Materials 
