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Zhizhong Liang

Raymond T Woodhams

Simon Adrianus Hesp

Insoluble particulate materials, which may be in solid or liquid form, are dispersed in a continuous non-aqueous phase and the dispersion rendered stable and resistant to phase separation by an in-situ stabilization procedure involving the formation of chemical bonds among the stabilizer components and to dispersed phases to form a network surrounding the particles which is compatible with the continuous phase. The invent ion has particular application for the formation of stabilized polyolefin-modified bitumen compositions for paving and other applications.

In-situ stabilized compositions

A stabilizer for bitumen-polymer compositions. Polyethylene-bitumen compositions having the polyethylene component dispersed throughout the solution and stabilized against gross phase separation are described. A method for preparation of the stabilizer includes vulcanization of a bitumen and amine-terminated poly(butadiene-co-acrylonitrile). Carboxylated polyethylene is coupled with the vulcanization product to obtain the stabilizer. Polyethylene dispersed in bitumen containing the stabilizer does not undergo gross phase separation and droplets in the 1 to 5 micron range are observed microscopically.

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Toronto, Canada

Zhizhong Liang