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US 8,748,628 B2Granted
Process and composition of making polymerizable resins containing oxazolidone
AssigneeDENTSPLY International Inc.
InventorXiaoming Jin
Life of this patent
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Abstract
Disclosed herein are a process and composition to make polymerizable resins containing oxazolidone, in which organic acid-catalyzed and/or thermal annealing process got involved and consequently promoted a unique intramolecular transformation from a linear urethane linkage to a cyclic urethane linkage for those specifically constructed urethane resins containing α-substituted β-ketone moieties.
Claims11
A process, comprising:
- reacting at least two isocyanates and an α-substituted β-ketone to form a linear condensate,
- converting the linear condensate into a cyclic oxazolidone based resin or polymer,
- wherein converting the linear condensate is induced by thermally annealing the linear condensate at a temperature of from about 25° C. to about 150° C., or by reacting the linear condensate in the presence of an acid at a temperature of from about 23° C. to about 27° C.
Dependencies are inferred from the claim text.