A method for producing a conductive film having a substrate and a conductive layer disposed on the substrate has a first step of forming a precursor layer on the substrate, the precursor layer including a metal component or its precursor, a water-insoluble polymer X having a cross-linking group, a water-insoluble polymer Y having a reactive group that reacts with the cross-linking group, and a water-soluble polymer Z different from polymer X and polymer Y; a second step of reacting the cross-linking group in the water-insoluble polymer X with the reactive group in the water-insoluble polymer Y; and a third step of forming the conductive layer by removing the water-soluble polymer Z.

The present invention relates to a method for preparing a surgical anti-adhesion barrier film comprising the following steps: a) a first solution, comprising an oxidized collagen is prepared, b) a polyphosphate compound is added to the solution of a) in a quantity so as to obtain a concentration of polyphosphate ranging from 0.007 to 0.7%, by weight, with respect to the total weight of the solution, c) the pH of the solution obtained in b) is adjusted to about 9 by addition of a base or to about 5.1 by addition of an acid, d) a diluted solution is prepared by adding water to solution of c), e) a first layer of solution obtained in c) is casted on an inert support, f) before complete gelation of the layer obtained in d), a second layer, of diluted solution obtained in d) is applied on top of said first layer and let to gelify, g) the gelified first and second layers are dried to obtain a film.

The invention further relates to a film obtainable by such a method and to a surgical implant comprising a prosthetic fabric and such a film.

A process for preparing a powder of a material of natural origin, which includes a step of treating a substance containing at least 70% by weight of one or more leather wastes in particle form in a twin-screw extruder, wherein a temperature profile is applied that increases from an initial temperature of between 10 and 40 C. up to a maximum temperature of between 60 and 120 C., in the presence of water in an amount such that the weight ratio of water to substance is between 0.20 and 6.

The present disclosure relates to thermoplastic protein elastomer compositions comprising protein, at least one reactive thermoplastic elastomer, and at least one softener, as well as composite materials made from these compositions. Methods of making and using the thermoplastic protein elastomer composite materials to produce engineered leather are also disclosed. In some embodiments, the protein is selected from the group consisting of: soy protein, cellulase, zein protein, egg white albumin, and pea protein; and wherein the protein and the thermoplastic elastomer are not covalently bound together. In some embodiments, the protein and the thermoplastic elastomer are present in co-continuous phases.