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Aqueous dispersions containing a synergistic dispersant combination

  • US 5,266,622 A
  • Filed: 11/02/1992
  • Issued: 11/30/1993
  • Est. Priority Date: 05/05/1988
  • Status: Expired due to Fees
First Claim
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1. Aqueous dispersions of fillers and/or pigments, which contain a synergistic dispersant combination of the following compositions:

  • A) 50 to 80% by weight of a water-soluble polymer selected from the group consisting of cellulose derivatives, sulphonated polyesters and hydrolysates of polyacrylonitrile, including carboxymethylcellulose, homopolymers and copolymers of methacrylic and/or acrylic acid and their salts with molecular weights in the range from 800 to 40,000,B) 10 to 40% by weight of a non-ionic alkylene oxide adduct of the formula ##STR11## in which R4 denotes an optionally stubstituted aliphatic, aromatic or araliphatic radical having 1 to 40 carbon atoms,R5 denotes hydrogen, phenyl or alkyl radical having 1 to 12 C atoms andn denotes a number from 2 to 300.n preferably denotes 4 to 100, andD) 10 to 30% by weight of a compound of the formula ##STR12## in which R7 is hydrogen, a monovalent metal ion or an optionally substituted ammonium ion andY is hydrogen, a monovalent metal ion or an optionally substituted ammonium ion,where the sum A) +B) +D) gives 100% by weight.

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