Method of producing fibre-reinforced composition

A process of producing a fibre-reinforced composition comprising wetting a plurality of continuous filaments with a melt by drawing the filament through a melt which comprises a mixture of a thermoplastic polymer and a plasticiser for the polymer in the weight ratio between 1:4 and 99:1 of polymer to plasticiser the plasticiser being thermally stable at least up to the temperature of the melt and having volatility characteristics such that the plasticiser can be volatilized from the composition below the decomposition temperature of the thermoplastic polymer but has a sufficiently low volatility at the temperature of the melt to plasticise the polymer in the melt and give a melt of reduced viscosity compared with the melt viscosity of the polymer alone, and substantially reducing the plasticiser content of the composition while the wetted filaments are at a temperature above the glass transition temperature of the polymer alone but below the decomposition temperature of the polymer such that the plasticiser content is 5% or less by weight of the composition.