Photopolymerizable compositions featuring novel amine accelerator for improved color stability and reduced polymerization stress thereby
A photopolymerization accelerator composition improving color stability and controlling polymerization shrinkage stress of cured resin and/or the resulting composite paste thereby feature by tertiary twisted biphenyldiamine with the general formula I: R2 and R3 are each independently alkyl having from 1 to 5 carbon atoms; R and R1 are each independently hydrogen or halogen; alkyl alkoxy, or alkylthio having from 1 to 18 carbon atoms; or phenyl and/or substituted phenyl alkoxy, or alkylthio having from 1 to 18 carbon atoms. It can be used in part with conventional photosensitizers and radically polymerizable monomers.
1. A photopolymerizable composition comprising an aromatic tertiary diamine having a twisted biphenyl moiety, a photosensitizer, and at least one polymerizable resin;
wherein the at least one polymerizable resin consists of at least one of a monofunctional (meth)acrylate monomer or a polyfunctional (meth)acrylate monomer; and
wherein the aromatic tertiary diamine having the twisted biphenyl moiety is selected from the group consisting of:
and combinations thereof.
2. A photopolymerizable composition comprising an aromatic tertiary diamine having a twisted biphenyl moiety, a photosensitizer, and at least one polymerizable resin;
wherein the at least one polymerizable resin consists of at least one of a monofunctional (meth)acrylate monomer or a polyfunctional (meth)acrylate monomer; and
wherein the aromatic tertiary diamine having the twisted biphenyl moiety comprises a trifluoromethyl substituent on each of the two phenyl groups in the twisted biphenyl moiety.
3. The composition of claim 2 , wherein the aromatic tertiary diamine having the twisted biphenyl moiety comprises