William M. Hann - Pennsburg PA John Natoli - Ambler PA
Assignee:
Rohm and Haas Company - Philadelphia PA
International Classification:
C02F 510
US Classification:
210701
Abstract:
A method for inhibiting scale formation in aqueous systems using water-soluble, low molecular weight copolymers of unsaturated aliphatic carboxylic acids is provided. Copolymers formed from about 30 to about 70 weight percent acrylic acid and from about 70 to about 30 weight percent methacrylic acid, having a weight average molecular weight ranging from about 2000 to about 5000, are preferred for inhibiting the formation of common hardness ion salt scale such as calcium carbonate, calcium phosphate and barium sulfate. The copolymers are hydrolytically stable and can be used effectively in high temperature applications. The copolymers are also effective dispersants for suspended inorganic particulate materials, such as clay, in aqueous systems.
Method Of Dispersing Inorganic Materials In Aqueous Systems With Low Molecular Weight Acrylic Acid Copolymers
William M. Hann - Pennsburg PA Jean DuPre - Levittown PA John Natoli - Ambler PA
Assignee:
Rohm and Haas Company - Philadelphia PA
International Classification:
C02F 510
US Classification:
210701
Abstract:
A method for dispersing inorganic materials in aqueous systems using water soluble, low molecular weight copolymers of acrylic acid is provided. Copolymers having a weight average molecular weight of from about 2,000 to about 5,000 formed from about 85 to about 97 weight percent acrylic acid and from about 3 to about 15 weight percent of a hydrophobic comonomer are provided for effective dispersion of suspended particulate matter, such as clay, and for inhibiting the precipitation of common hardness ion salts in aqueous systems. The most preferred copolymers have a weight average molecular weight of about 3,000 and are formed from about 95 weight percent acrylic acid and about 5 weight percent ethyl acrylate.