Patent ID: 7988821
Filing Date: 2011-08-02
Classification: D06L,D06P,D21C,Y02W

Abstract:
1. A process for the treatment of a fibre material comprising contacting the fibre material in an aqueous medium with a chelating agent and a single polymer having the following general formula wherein R R M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol; and wherein the fibre material is a cellulosic fibre material comprising a chemical, mechanical or chemi-mechanical pulp or a recycled fibre material; and wherein the weight ratio of the polymer to the chelating agent is from 1:4 to 4:1.