BigPatents India

A process for the preparation of parchment like material by size reductiono f chrome shavings to a fibre size of not more than 35 mm known method, followed by hydrolysis with alkali by conventional method at a pH in the range of 10-13 for a period in the range of 0.5-4 hrs to get a semi solid mass, adjusting the pH of the semi solid mass, as formed in step(i), in the range of 1.5-3 by conventional method, optionally raising the pH of the resulting mass to a range of 3.5-5 by known method, adding 1-5% w/v of conventional plasticizer and/ or 0.05-2% w/v of conventional crosslinker to the mass followed by casting and subsequent drying by conventional method at a temperature in the range of 35-50oC to get parchment like material.