Process for production of a synthetic paper improved against dusting trouble

Claim 1

In a process for producing a synthetic paper having an opaque paperlike layer on at least one surface thereof which comprises stretching in one axial direction a laminate sheet containing a surface layer of a resin having fine filler particles incorporated therein laminated on to at least one surface of a resinous substrate, said stretching operation causing the resin surface containing the fine filler particles to become opaque, the improvement which comprises (a) coating the surface of the layer containing filler particles therein with an aqueous dispersion of a dry-extensible, polymeric coating material to avoid dusting problems due to the filler particles coming off the surface of the resin layer, said coating material being selected from the group consisting of C 1 -C 8 alkyl acrylate homopolymers or copolymers, ethylene vinyl acetate copolymers and polyethylene wax, the concentration of said coating material being in the range of 3 to 10% by weight of the aqueous dispersion and the amount of said dispersion applied being in the range of 0.3 to 1 g/m 2 on the basis of the coating material; (b) drying the coated sheet, and (c) subjecting the coated sheet to a transverse stretching operation, said steps (a) and (b) being carried out at the latest before the transverse stretching operation (c).