Kinetic arrest originating in competition between attractive interaction and packing force

We discuss the situation where attractive and repulsive portions of the int erparticle potential both contribute significantly to glass formation. We i ntroduce the square-well potential as prototypical model for this situation , and reject the Baxter model as a useful model for comparison to experimen t on glasses, based on our treatment within mode coupling theory. We presen t explicit results for various well widths, and show that, for narrow wells , there is a useful analytical formula that would be suitable for experimen talists working in the field of colloidal science. We raise the question as to whether, in a more exact treatment, the sticky-sphere limit might have an infinite glass transition temperature or a high but finite one.