Hybrid latex particles composed of an elastomeric polyolefin core and an acrylic shell are useful additives in engineering resins. A two-step mechanical dispersion/emulsion polymerization process provides particles with a lobed morphology over a 150-500 nm diameter range at various polyolefin:acrylic weight ratios. The composition, crystallinity, and thermal properties of the polyolefin core can be varied independently of the physiochemical properties of the acrylic phase. As a result, this approach provides control over the final properties of the multiphase latex, and the unique properties of each polymer component can be simultaneously exploited. For example, isolated particles can be melt-blended and co-extruded into a variety of engineering plastics as additives that improve the physicochemical properties of the host resin. Dispersed within a resin, the acrylic shell acts as a compatibilizer between the polyolefin and the host matrix while also improving weatherability; at the same time, discrete domains of elastomeric polyolefin provide impact resistance and improvements in melt flow. The results of this work create new opportunities for the use of hybrid polyolefin-acrylic particles in a range of plastic additive applications.

Polyolefin-acrylic hybrid latex particles: Additives in engineering plastics

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