Patent ID: 7041730
Filing Date: 2006-05-09
Classification: C08B,C08F,C11D

Abstract:
1. A substituted polysaccharide useful as a macroinitiator for preparing graft polysaccharide polymers by controlled graft polymerisation, in which at least one sugar unit of the polysaccharide is substituted by a group of the formula in which W represents a group —O— or —NR p, q and r are each Independently 0 or 1; L represents an optionally substituted alkylene, cycloalkylene, arylene or heteroarylene group; X and Y each independently represent a group —CH Z comprises a halogen atom and represents a control agent site from which a polymer may propagate during a free radical polymerisation process, the substituted polysaccharide having the general formula wherein each SU represents a sugar unit in a polysaccharide backbone; a represents the number of unsubstituted sugar units as a percentage of the total number of sugar units and is in the range from 0 to 99.9%, b represents the number of substituted sugar units as a percentage of the total number of sugar units and is in the range from 0.1 to 100%, preferably 1 to 35%, more preferably 1 to 20%; m represents the degree of substitution per sugar unit and is from 1 to 3, in which the polysaccharide has a β-1,4-linked backbone.