Cellulose materials with novel properties

摘要

A molecule possessing a primary or secondary amino group and an additional functionality capable of providing a novel or improved property to a cellulose material has been permanently attached to the cellulose material in aqueous media using a water-soluble carbodiimide as the coupling agent/activator. One such molecule is 5-aminofluorescein (abbreviated as “A-fluo”) and one such cellulose material is a papermaking pulp. Papers made from a pulp furnish containing, for example, 0.01 wt. % of the “A-fluo”-attached pulp show an embedded marker feature authenticable upon UV or visible light excitation. The “A-fluo”-attached pulp can also be used for the marking and identification of a pulp furnish.

主权项

1. A modified cellulosic, lignocellulosic or cellulose material comprising: a cellulosic, lignocellulosic or cellulose substrate bearing an amino modifier, said modifier being covalently linked through the amino of said modifier to a carboxyl of said substrate, said modifier possessing a single primary or secondary amino group and having a functionality capable of introducing a foreign or an improved property into said substrate, said substrate being a non-chemically derivatised substrate selected from the group consisting of papermaking pulp, microfibrillated cellulose and nanofibrillated cellulose.