Patent ID: 9682019
Date: 2017-06-20
CPC Classifications: A61K

Claim:
1. An aqueous dental glass ionomer composition comprising: (a) a reactive particulate glass, (b) a linear or branched polymer comprising acidic groups, which is reactive with the particulate glass in a cement reaction, whereby the linear or branched polymer comprising acidic groups has a polymer backbone and optionally pendant groups, (c) optionally dispersed nanoparticles comprising grafted linear or branched polymer chains comprising acidic groups, and having a polymer backbone characterized in that a polymer backbone of the linear or branched polymer of component (b) and/or, if present, the grafted linear or branched polymer chains of component (c) are obtained by a process comprising: wherein X is an oxygen atom, a sulfur atom, an NR Y R R Z represents a single bond, an alkylene group, a cycloalkylene group, or an arylene group, whereby carboxylic acid groups present in R wherein the polymer backbone of the linear or branched polymer of component (b) and/or, if present, the grafted linear or branched polymer chains of component (c) are obtained by a further step of reacting a polymer or copolymer obtained by a process comprising step (i) with a compound for introducing one or more functional groups selected from a polymerizable double bond, a thiol group or a carboxylic acid group, whereby the compound is a bifunctional compound having a functional group reactive with a carboxylic acid anhydride group, carboxylic acid group, or activated carboxylic acid group.