Patent ID: 7282113
Filing Date: 2007-10-16
Classification: D21C,Y02W

Abstract:
1. A method for deinking of waste paper pulp comprising: i) contacting a pulp of waste paper with at least a first enzyme which acts to dislodge ink and toner from the pulp, and at least a second enzyme which acts to disperse ink and toner in the pulp, ii) deinking said pulp with said enzymes, and, iii) recovering a deinked pulp, a) internal and surface substrates of said pulp, and b) interfacial substrates between the paper and ink and toner of the pulp, to dislodge ink and toner from said pulp; and said second enzyme is selected from the group consisting of 2,4-pentanedione hydrolase, a polyvinyl alcohol oxidase and mixtures thereof, and acts to disperse substrates present in ink and toner in said pulp.