Method for the separation of high impact polystyrene (HIPS) and

Details Method for the separation of high impact polystyrene (HIPS) and Method for the separation of high impact polystyrene (HIPS) and

1996-03-19

1997-08-05

Lithgow, Thomas M.

Classifying, separating, and assorting solids

Fluid suspension

Liquid

209 9, 209166, 209173, 241 2418, 241 2428, 521 405, 521 41, 521 435, B03B 104, B03B 528, B03D 102

Patent

active

056538677

ABSTRACT:
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.

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