Patent ID: 8198219

Claim:
A process for producing solid materials comprising: solubilizing at least one synthetic polymer and/or biopolymer (A), or at least one synthetic polymer and/or biopolymer (A) and at least one additive (B), in at least one anhydrous chaotropic liquid (C), contacting a solution or dispersion (AC) or (ABC) obtained in the solubilizing step with a liquid (D1) which is miscible with the chaotropic liquid (C), but in which at least the synthetic polymer and/or the biopolymer (A) are insoluble, which results in a phase (E) which comprises solid synthetic polymer and/or biopolymer (A), chaotropic liquid (C) and liquid (D1), and if appropriate the at least one additive (B), and a liquid phase (F) which comprises chaotropic liquid (C) and liquid (D1), removing the chaotropic liquid (C) from phase (E) with the aid of the liquid (D1), which results in a gel (G) based on synthetic polymer and/or biopolymer (A), impregnating the gel (G) with a liquid (D2) which is miscible both with the chaotropic liquid (C) and with the liquid (D1), but in which at least the synthetic polymer and biopolymer (A) are insoluble, and which has a higher volatility than the liquid (D1), and removing the two liquids (D1) and (D2) from the gel (G) by evaporating, which gives rise to a solid material based on synthetic polymer and/or biopolymer (A).