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 methacrylate functional group capable of polymerizing with said monomer by covalently bonding the polymerizable acrylate functional group with 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 methacrylate functional group and is covalently bonded to the polymeric continuous phase.
A method for manufacturing a composition having a microcapsule and a continuous phase wherein said microcapsule comprises a methacrylate functionalized surface capable of covalently bonding to the continuous phase comprising:
- a. mixing an oligomeric urethane by reaction of a diol and diisocyanate, in which the diisocyanate is used in molar excess, and reacting for about 1 hour;
- b. adding 2-hydroxyethylmethacrylate to the oligomeric urethane mixture to terminate chain ends with methacrylate functional groups to create a functionalized urethane;
- c. isolating the functionalized urethane;
- d. 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 addition of an aqueous phase that may contain a salt;
- e. adding diol to the surfactant free inverse emulsion to polymerize the urethane oligomers and encapsulate the aqueous phase;
- and
- f. isolating the microcapsules by centrifugation.
Dependencies are inferred from the claim text.