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 backbon
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 Sinear or branched polymer chains of component (c) are obtainable a process comprising (i) cyclopolymerizing or cyclocopolymerizing one or more compounds of the following formula (I).
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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 back
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: (i) cyclopolymerizing or cyclocopolymerizing one or more compounds of the following formula (I): whereinX is an oxygen atom, a sulfur atom, an NR7 group, or a CR8R9 group,Y1 and Y2 which are independent from each other, represent a CR8R9 group or a single bond,R1, R2, R3, R4, R5, R6, R7, R8, and R9 which are independent from each other represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a ZCOOR10, ZCN, ZC(O)NHR11, or ZC(O)NR12R13,R10, R11, R12, and R13 which are independent from each other represents a hydrogen atom, an alkyl group, or an aryl group, andZ represents a single bond, an alkylene group, a cycloalkylene group, or an arylene group,whereby carboxylic acid groups present in R2 and R5 or R4 and R6 may form a carboxylic acid anhydride moiety, optionally (ii) 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, and optionally(iii) repeating step (ii) with a polymer or copolymer obtained by a process comprising step (ii); andwherein 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. 2. The aqueous dental glass ionomer composition according to claim 1, wherein the polymer backbone of the linear or branched polymer comprises acidic groups and/or wherein the pendant groups comprise acidic groups. 3. The aqueous dental glass ionomer composition according to claim 1, wherein the acidic groups of the linear or branched polymer are carboxylic acid groups. 4. The aqueous dental glass ionomer composition according to claim 1, wherein X is an oxygen atom or a CR8R9 group, wherein R8 and R9 are selected from a hydrogen atom, a ZCOOR10, ZCN, ZC(O)NHR11 and ZC(O)NR12R13 and R10, R11, R12, R13 and Z are as defined in claim 1. 5. The aqueous dental glass ionomer composition according to claim 1, wherein R1, R2, R3, and R4 are hydrogen atoms. 6. The aqueous dental glass ionomer composition according to claim 1, wherein R5 and R6, which are independent from each other represent COOR10, CN, C(O)NHR11 or C(O)NR12R13, and R10, R11, R12 and R13 are as defined in claim 1. 7. The aqueous dental glass ionomer composition according to claim 1, wherein R5 and R6, which are independent from each other represent ZCOOR10, and R10 and Z are as defined in claim 1. 8. The aqueous dental glass ionomer composition according to claim 1, wherein the linear or branched polymer comprising acidic groups has a molecular weight Mw in the range of more than 1,000 to 1,000,000. 9. The aqueous dental glass ionomer composition according to claim 1, wherein the reactive particulate glass comprises: (a) 10-35% by weight of silica;(b) 10-35% by weight of alumina;(c) 3-30% by weight of zinc oxide;(d) 4-30% by weight of P2O5; and(e) 3-25% by weight of fluoride. 10. The aqueous dental glass ionomer composition according to claim 1, comprising 20 to 80 percent by weight of the reactive particulate glass, based on the weight of the entire composition and/or comprising 10 to 80 percent by weight of the polymer comprising acidic groups, based on the weight of the entire composition, and/or comprising up to 75 percent by weight of dispersed nanoparticles based on the weight of the entire composition. 11. The aqueous dental glass ionomer composition according to claim 1, wherein the activated carboxylic acid group is a carboxylic acid chloride. 12. The aqueous dental glass ionomer composition according to claim 1, wherein the further functional group is selected from the group consisting of a polymerizable double bond, a thiol group, or a carboxylic acid group. 13. 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: (i) cyclopolymerizing or cyclocopolymerizing one or more compounds of the following formula (I): whereinX is an oxygen atom, a sulfur atom, an NR7 group, or a CR8R9 group,Y1 and Y2 which are independent from each other, represent a CR8R9 group or a single bond,R1, R2, R3, R4, R5, R6, R7, R8, and R9 which are independent from each other represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a ZCOOR10, ZCN, ZC(O)NHR11, or ZC(O)NR12R13,R10, R11, R12, and R13 which are independent from each other represents a hydrogen atom, an alkyl group, or an aryl group, andZ represents a single bond, an alkylene group, a cycloalkylene group, or an arylene group,whereby carboxylic acid groups present in R2 and R5 or R4 and R6 may form a carboxylic acid anhydride moiety, optionally (ii) 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, and optionally(iii) repeating step (ii) with a polymer or copolymer obtained by a process comprising step (ii) and (iii);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 cyclocopolymerizing a compound of the following formula (I) with one or more compound selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, itaconic acid anhydride, maleic acid, maleic anhydride, fumaric acid, methyl acrylate, ethyl acrylate, n-butyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, phenyl acrylate, benzyl acrylate, phenyl methacrylate, benzyl methacrylate, 2-phenylethyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, styrene, 8-methyl styrene, vinylpyridine, N-vinyl pyrrolidone, vinyl carbazole, vinyldene halide, and acrylonitrile. 14. The aqueous dental glass ionomer composition according to claim 13, wherein the polymer backbone of the linear or branched polymer comprises acidic groups and/or wherein the pendant groups comprise acidic groups. 15. The aqueous dental glass ionomer composition according to claim 13, wherein the acidic groups of the linear or branched polymer are carboxylic acid groups. 16. The aqueous dental glass ionomer composition according to claim 13, wherein the linear or branched polymer comprising acidic groups has a molecular weight Mw in the range of more than 1,000 to 1,000,000. 17. The aqueous dental glass ionomer composition according to claim 13, wherein the reactive particulate glass comprises: (a) 10-35% by weight of silica;(b) 10-35% by weight of alumina;(c) 3-30% by weight of zinc oxide;(d) 4-30% by weight of P2O5; and(e) 3-25% by weight of fluoride. 18. The aqueous dental glass ionomer composition according to claim 13, comprising 20 to 80 percent by weight of the reactive particulate glass, based on the weight of the entire composition and/or comprising 10 to 80 percent by weight of the polymer comprising acidic groups, based on the weight of the entire composition, and/or comprising up to 75 percent by weight of dispersed nanoparticles based on the weight of the entire composition.
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