Process for the production of a deodorant or antiperspirant product

In some aspects a process for forming deodorant or antiperspirant soft solid in which a mobile deodorant or antiperspirant composition is filled into dispensing containers by injection moulding, i.e. a process in which the deodorant or antiperspirant composition is filled under pressure. The composition at the time of injection moulding is preferably in the vicinity of its normal setting temperature. The deodorant or antiperspirant composition is preferably continuously produced in a screw extruder, especially a twin screw extruder, which is controlled to deliver the composition in a suitably viscous state under low shear, at a temperature in the vicinity of its normal setting temperature. Use of the twin screw extruder is particularly advantageous for formulations in which a particulate antiperspirant is suspended in a fluid carrier. It is injected into the container at a head pressure at the point of injection that is greater than 120 kPa and in many instances from 800 to 2000 kPa in the injection head. The combined process offers benefits for controlled fill of dispensing containers, particularly for formulations incorporating sensitive ingredients and offers tolerance in composition temperature at the time of fill.