Abstract: A process for producing a composite plastic pipe, which comprises producing a thermoplastic resin pipe (I) by an extruder, covering the surface of the pipe (I) uniformly with a continuous fibrous reinforcing material (II) impregnated with a thermosetting resin in its axial direction by a draw molding method, helically winding a continuous fibrous reinforcing material (III) impregnated or not impregnated with a thermosetting resin uniformly on the layer of the resin fibrous reinforcing material (II) by a filament winding method, thereafter curing the thermosetting resin by irradiation of ultraviolet light and coating a thermoplastic resin (IV) on the resulting product within a crosshead die in an extruder.

Abstract: A nematic liquid crystalline compound of the general formula ##STR1## wherein R and R' each represent a linear alkyl group having 1 to 9 carbon atoms, and the two cyclohexane rings are arranged in a trans(equatorial-equatorial) form.