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Polymer article and its use for controlled introduction of reagent into a fluid

  • US 4,670,166 A
  • Filed: 02/27/1985
  • Issued: 06/02/1987
  • Est. Priority Date: 02/27/1985
  • Status: Expired due to Fees
First Claim
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1. A method for the controlled introduction of a water-soluble reagent into an environment containing condensed water which comprises:

  • (a) suspension copolymerizing a monomer selected from acrylic acid, acrylamide, and acrylonitrile with a difunctional hydrophylic comonomer to form water-insoluble hard solid particles of a polymer having a softening point above said environment, said particles having structural integrity, internal porosity, and a particle size of at least 50 microns and less than 2 millimeters, said monomer with said comonomer having dissolved therein a water soluble reagent which is insoluble in said polymer whereby said reagent remains in the pores of said particles following the copolymerization step, said reagent constituting at least 5 weight percent and not more than 30 weight percent based on the combined weights of the polymer and the reagent;

    said reagent being selected from the group consisting of scale inhibitors, surfactants, corrosion inhibitors, biocides, foamers, and oxygen scavengers;

    (b) placing said particles in said environment;

    (c) flowing water through said particles thereby leaching an effective amount of said water-soluble reagent from said particles forming an aqueous solution of said reagent in said environment, said particles retaining their physical structural integrity; and

    (d) flowing said aqueous solution in said environment.

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