Method for preparing laminated article of cellulosic and polymeric layers

Claim 1

Method of preparing a tri-layer laminated article having two outer cellulosic layers and a middle thermoplastic polymeric layer comprising: a. establishing a heterogeneous composite of thermoplastic polymer in finely divided form and molten wax, said polymer having a melting point between the melting point of the wax and 300*C., and being substantially insoluble in molten wax at a temperature below the melting point of the polymer; b. forming an inner layer of said heterogeneous composite adjacent to and between two cellulosic layers, at least one of said cellulosic layers being porous and the amount of said heterogeneous composite bein regulated so that substantially all wax therein is absorbable in pores of the cellulosic material and permitting sufficient time to elapse so that substantially all of the wax in said heterogeneous composite is separated from said polymer and absorbed into said porous cellulosic material and then; c. heating the inner layer to a temperature above the melting point of the polymer and pressing the outer layers against the inner layer to form an essentially continuous molten layer; d. and thereafter cooling the molten polymer whereby it solidifies resulting in said article having at least one cellulosic layer impregnated with wax.