The Dow Chemical Company

Mark E Soderquist

David Schrader

Mark D Heires

Hamish Small

Peter A Doty

Ramaiah Muthyala

William A Larson

James W Pischke

High impact polystyrene resins are provided having a surprisingly good combination of toughness and gloss characteristics. Such resins contain small (i.e., 0.1 to 0.4 micron) capsule morphology rubber particles in combination with relatively small (i.e., 0.25 to 1 micron) entanglement morphology rubber particles. It has been found that such resins are capable of providing Izod impact strength values in the range of 2.5 to 3.5 ft-lb/in (133.4 to 186.7 J/m) and higher at an overall volume average rubber size of less than 0.4 micron with corresponding gloss values in excess of 90 percent.

Rubber modified polystyrene

Apparatus and method for the chromatographic separation and analysis of ionic species. This process is carried out utilizing, in an ion separator column, the combination of a low capacity, high performance resin as the stationary phase, and a weakly ionized electrolyte as the eluant or developing reagent, to effect resolution of ionic species in solution. For anion separation, a weak base resin of low capacity and high efficiency is used as the stationary phase, and a solution of a weak base or water as the mobile phase. For cation separation, a weak acid resin of low capacity and high efficiency is used as the stationary phase and a solution of a weak acid as the mobile phase. Because the eluant employed has a very low background conductivity, it will register only insignificantly on the readout from the conductivity cell. Thus, the method of the invention obviates the need for the eluant suppressor or 'stripper' device used in conventional ion chromatography. The invention thereby enables continuous, uninterrupted measurements and eliminates the reservoirs, pumps, complex valving and electronics associated with such suppressor columns.

Weak eluant ion chromatography

Compositions useful as corrosion inhibitors for high density brines at high temperatures comprise phosphonium salts, such as triphenyldocosyl phosphonium chloride.

Phosphonium salt-containing corrosion inhibitors for high density brines

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Midland, MI, United States of America

Mark E Soderquist