Bondable microcapsules and surface functionalized fillers
AssigneePremier Dental Products Company
InventorsStephen M. Gross, William A. McHale, Mark A. Latta
Life of this patent
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Abstract
A composition comprising microcapsules functionalized with polymerizable functional groups on the surface of said microcapsules wherein the functional groups form covalent bonds with monomers in the continuous phase to enhance the mechanical properties of the composition.
Claims19
A composition comprising a monomer, an initiator, and a nonbiodegradable microcapsule encapsulating an aqueous solution of a salt wherein said microcapsule has a surface functionalized with a polymerizable acrylate functional group capable of polymerizing with said monomer with a carbon-carbon covalent bond between the polymerizable acrylate functional group and the monomer.
A composition comprising a polymeric continuous phase and a discontinuous phase wherein the continuous phase comprises a polymeric material and the discontinuous phase comprised a microcapsule encapsulating an aqueous solution, wherein said microcapsule has a surface functionalized with a polymerizable acrylate functional group and is bonded to the polymeric continuous phase with a carbon-carbon bond.
A method for manufacturing a composition having a microcapsule and a continuous phase wherein said microcapsule comprises a functionalized surface capable of covalently bonding with a carbon-carbon bond to the continuous phase comprising:
- mixing an oligomeric urethane by reaction of a diol and diisocyanate, in which the diisocyanate is used in molar excess, and reacting for a about 1 hour;
- adding 2-hydroxyethylmethacrylate to the resulting oligomeric urethane mixture to terminate chain ends with methacrylate functional groups;
- isolating the functionalized urethane;
- adding the isolated functionalized urethane to an oil phase comprising an emulsifying agent and an organic solvent wherein a surfactant free inverse emulsion is formed with the addition of an aqueous phase that may contain a salt;
- adding diol to the surfactant free reverse emulsion to polymerize the urethane oligomers and encapsulate the aqueous solution;
- and isolating the microcapsules by centrifugation.
Dependencies are inferred from the claim text.