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Polymer article of manufacture

  • US 5,073,276 A
  • Filed: 01/03/1989
  • Issued: 12/17/1991
  • Est. Priority Date: 11/25/1983
  • Status: Expired due to Fees
First Claim
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1. A particulate treating material for an environment including a hydrocarbon liquid, each particle of the material comprising:

  • (a) a body composed of a copolymer prepared by suspension polymerization of a monomer mixture of(i) a first monomer selected from the group consisting of acrylic alkyl esters, styrene, acrylonitrile, and mixtures thereof;

    (ii) a second monomer selected from the group consisting of methacrylic acid, hydroxyalkyl acrylates, hydroxyalkyl methacrylates, dialkylaminoalkyl acrylates, dialkylaminoalkyl methacrylates, and mixtures thereof;

    said copolymer being insoluble in hydrocarbon liquid, having a softening point above 30°

    C., having structural integrity, internal porosity, and a particle size of at least 100 microns and less than 2 millimeters; and

    (b) a reagent soluble in hydrocarbon liquid and being dispersed in said body, said reagent constituting at least 5 wt % and not more than 30 wt % based on the combined weights of the body and reagent, said reagent being added to, and soluble in, the monomer mixture and insoluble in the copolymer and being selected from the group consisting of scale inhibitors, corrosion inhibitors, biocides, foamers, and oxygen scavengers, and being leachable, at least in part, by a hydrocarbon liquid permeating said body, said body retaining its structural integrity without the reagent.

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