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Title: Method for the separation of high impact polystyrene (HIPS) and acrylonitrile butadiene styrene (ABS) plastics

An improved method is provided for separating acrylonitrile butadiene styrene (ABS) and high impact polystyrene (HIPS) plastics from each other. The ABS and HIPS plastics are shredded to provide a selected particle size. The shredded particles of the ABS and HIPS plastics are applied to a solution having a solution density in a predefined range between 1.055 gm/cm.sup.3 and 1.07 gm/cm.sup.3, a predefined surface tension in a range between 22 dynes/cm to 40 dynes/cm and a pH in the range of 1.77 and 2.05. In accordance with a feature of the invention, the novel method is provided for separating ABS and HIPS, two solid thermoplastics which have similar densities by selectively modifying the effective density of the HIPS using a binary solution with the appropriate properties, such as pH, density and surface tension, such as a solution of acetic acid and water or a quaternary solution having the appropriate density, surface tension, and pH.
 [1];  [2];  [3];  [4];  [5]
  1. (Chicago, IL)
  2. (Amherst, NY)
  3. (Downers Grove, IL)
  4. (Crest Hill, IL)
  5. (Oak Lawn, IL)
Issue Date:
OSTI Identifier:
University of Chicago (Chicago, IL) ANL
Patent Number(s):
US 5653867
Contract Number:
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
method; separation; impact; polystyrene; hips; acrylonitrile; butadiene; styrene; plastics; improved; provided; separating; shredded; provide; selected; particle; size; particles; applied; solution; density; predefined; range; 055; gm; cm; 07; surface; tension; 22; dynes; 40; ph; 77; 05; accordance; feature; novel; solid; thermoplastics; similar; densities; selectively; modifying; effective; binary; appropriate; properties; acetic; acid; water; quaternary; acetic acid; improved method; particle size; novel method; surface tension; selected particle; selectively modifying; impact polystyrene; solid thermoplastic; butadiene styrene; acrylonitrile butadiene; binary solution; /209/241/521/