Abstract: A method for producing a seamless tube for use as an intermediate image-transfer belt, comprising the step of continuously extruding an electrically conductive composition comprising the following components (a), (b) and (c) to form an unstretched seamless tube having a thickness of 50 to 1000 .mu.m and a sheet resistance of 10.sup.5 to 10.sup.13 .OMEGA./.quadrature.: (a) a thermoplastic aromatic polycarbonate resin, (b) a thermoplastic poly(alkylene terephthalate) resin and (c) acetylene black, the amount of the component (a) being from 60 to 95 wt. % of the total weight of the component (a) and the component (b) the amount of the component (b) being from 40 to 5 wt. % of the total weight of the component (a) and the component (b), and the amount of the component (c) being from 10 to 25 parts by weight for 100 parts by weight of the total amount of the component (a) and the component (b).

Abstract: A process for producing an air-permeable film is described, comprising stretching in at least one direction a film made of a composition comprising 42 to 87 vol % of a polyolefin resin and 58 to 13 vol % of an inorganic filler and further containing an aliphatic alcohol/fatty acid ester of a fatty acid having 10 to 22 carbon atoms and an aliphatic alcohol having 1 to 12 carbon atoms in an amount of 3 to 25 parts by weight per 100 parts by weight of the above composition.

Abstract: A process for producing an air-permeable film, which comprises:(a) biaxially stretching a tubular unstretched film of a composition comprising 42 to 87 vol % of a thermoplastic resin and 58 to 13 vol % of an inorganic filler along a truncated-conical mandrel;(b) blowing a gas over the outside of the biaxially stretched tubular film to cool said film; and(c) simultaneously blowing a gas continuously into the tube of the film so as to penetrate the gas through the film and go outside.