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

• Current Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Original Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Inventors: Walker, John R., Stockwell, John R., Newlove, John C., McDougall, Lee A.
• Primary Examiner(s): Hill, Jr., Robert J.
• Application Number:
  US07/294,895
• Time in Patent Office: 1,078 Days
• Field of Search: 252/8.551-8.555, 166/279, 166/304, 166/312
• US Class Current: 507/224
• CPC Class Codes: A61K 9/1635 obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyvinyl pyrrolidone, poly(meth)acrylates
• CPC Class Codes: C09K 8/524 organic depositions, e.g. paraffins or asphaltenes
• CPC Class Codes: C09K 8/64 Oil-based compositions
• CPC Class Codes: C09K 8/82 Oil-based compositions C09K8/64 takes precedence
• CPC Class Codes: Y10S 507/902 Controlled release agent
• CPC Class Codes: Y10S 507/927 Well cleaning fluid
• CPC Class Codes: Y10S 507/939 Corrosion inhibitor

Abstract

A solid polymeric body comprising a polymer matrix containing a substantially water-insoluble reagent leachable into a substantially hydrocarbon liquid environment, the matrix being reagent permeative and the body preferably having a softening point substantially above that of the temperature of the liquid fluid environment in which it is to be employed. The body is useful for the introduction of an additive reagent into a substantially liquid hydrocarbon such as crude and refined oils.

Claims

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.

2. The particulate treating material of claim 1 wherein the first monomer is selected from the group consisting of alkyl acrylates and alkyl methacrylates wherein the alkyl group contains from 1 to 6 carbon atoms.

3. The particulate treating material of claim 2 wherein the first monomer is methyl methacrylate.

4. The particulate treating material of claim 1 wherein the monomer mixture further includes an effective amount but less than 10 wt % of acrylic acid or methacrylic acid based on the weight of the monomers to provide an outer region of reduced permeability compared to the particle region within the outer region.

5. The particulate treating material of claim 4 wherein the monomer mixture comprises a major weight proportion of the first monomer.

6. The particulate treating material of claim 5 wherein the first monomer is methyl methacrylate.

7. The particulate treating material of claim 1 wherein the first monomer is a blend of methyl methacrylate and styrene.

8. A particulate treating material for treating environments containing a hydrocarbon liquid wherein each particle comprises a solid copolymer body of structural integrity and having a particle size between 100 microns and 2 millimeters and a softening point above 30°

C., said copolymer body being formed by aqueous suspension polymerization of

(a) a monomer mixture comprising

(i) a first monomer selected from the group consisting of alkyl acrylic esters, styrene, and mixtures thereof,

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

(b) a water-insoluble, hydrocarbon liquid-soluble reagent dissolved in the monomer mixture, and being insoluble in the polymerized copolymer, whereby the reagent is dispersed throughout the copolymer body, said reagent being leachable from the body by the hydrocarbon liquid, at least in part, permeating the body, each body retaining its structural integrity with the reagent leached therefrom.

9. The particles of claim 8 wherein the first monomer is methyl methacrylate.

10. The particles of claim 8 wherein concentration of the second monomer is sufficient to produce the copolymer but does not exceed 20 wt % of the copolymer.

11. The particulate treating material of claim 8 wherein the monomer mixture further includes an effective amount but less than 10 wt % of acrylic acid or methacrylic acid based on the weight of the monomers to provide an outer region of reduced permeability compared to the particle region within the outer region.

12. The particles of claim 8 wherein the reagent is the behenyl half of a C₂₄ -C₂₈ alkenyl succinic anhydride polymer.