a laminated structure forming a synthetic paper made of a base or backing film layer made of a thermoplastic resin in a biaxially oriented state . a paper - like film layer is laminated to the base film layer and comprises a thermoplastic resin having 0 . 5 to 65 % by weight of particles of a fine , inorganic filler dispersed in the resin thereof substantially uniformly . the paper - like film layer is in an uniaxially oriented state and has microvoids dispersed therein formed by stretching the laminated films in a heated state . the microvoids comprise microvoids open to a surface of the paper - like film layer free of the base film layer and include microvoids , open and closed , distributed in the paper - like film layer defining therein a cellular , fibrous structure . the two films are formed from thermoplastic resinous compositions in which the components of each composition are well admixed and particles of a fine filler are uniformly distributed in the thermoplastic resin of the paper - like film layer to obtain , as much as possible , microvoids distributed therein uniformly . after the base film layer is formed , it is stretched in a heated state in a machine for longitudinal direction to orient the film uniaxially . the paper - like layer is laminated under pressure on one surface of the base film layer while in a melted state and the resulting laminated structure is stretched transversely to at least 2 . 5 times the original transverse dimension of the portion of film being stretched between grippers of a stretching machine . this orients the base film layer biaxially and the paper - like film layer uniaxially . the stretching must be sufficient for the stretching and particles of filler to develop microvoids in the paper - like film layer rendering it a cellular and fibrous structure . this application is a continuation of application ser . no . 349 , 961 , filed apr . 11 , 1973 , now abandoned ; which is a division of application ser . no . 197 , 757 , filed nov . 11 , 1971 , now abandoned ; which is continuation - in - part of application ser . no . 809 , 629 , filed mar . 21 , 1969 , now abandoned .