Patent ID: 6849210

Claim:
Process for the manufacture of a molding comprising the steps: a) preparing an aqueous solution comprising, (i) a water-soluble prepolymer having crosslinkable groups, wherein the water-soluble prepolymer is present in the aqueous solution in an amount of from 5% to 60% by weight, and (ii) a further compatible polymer in an amount sufficient to reduce mold opening forces required for opening a closed mold in which a molding is to be produced from the aqueous solution, wherein the further polymer is present in the aqueous solution in an amount of from 0.1% to 10% by weight, wherein the further polymer is devoid of crosslinkable groups, and wherein the further polymer forms a clear aqueous solution with the prepolymer having crosslinkable groups, b) introducing the solution obtained into a mold, c) triggering the crosslinking, and d) opening the mold such that the molding can be removed from the mold.