Sealed isocyanates
AssigneesAdaptive 3D Technologies, Board of Regents, The University of Texas System
InventorsBenjamin R. LUND, Walter VOIT
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Abstract
The present disclosure relates to sealed isocyanate resin compositions. The resin compositions may be used for additive manufacturing. One embodiment of the invention includes a photopolymerizable resin for additive manufacturing, the resin comprising: a blocked isocyanate; at least one monomer or oligomer; and a multifunctional nucleophile.
Claims25
1-158. (canceled)
A storage-stable photopolymerizable resin mixture, the resin mixture comprising:
- at least one monomer or oligomer;
- and
- a blocked isocyanate,
- wherein the blocked isocyanate is configured to liberate the reactive isocyanate functionality;
- wherein after combination of the components, the resin mixture exhibits no more than 100% increase in the viscosity after 1 week at room temperature.
The photopolymerizable resin according to claim 0, wherein the blocked isocyanate includes at least one of a uretdione, a biuret, an allophanate, an isocyanaurate, methylene dicyclohexyl diisocyanate (MDI) or toluene diisocyanate (TDI).
The photopolymerizable resin according to claim 0, wherein the uretdione is a uretdione of hexamethylene diisocyanate (HDI), a uretdione of isophorone diisocyanate (IDI), a uretdione of methylene dicyclohexyl diisocyanate (MDI), a uretdione of hydrogenated methylene dicyclohexyl diisocyanate (HMDI), or a uretdione of toluene diisocyanate (TDI).
The photopolymerizable resin according to claim 0, wherein the isocyanaurate is an isocyanaurate of hexamethylene diisocyanate (HDI), an isocyanaurate of isophorone diisocyanate (IDI), an isocyanaurate of methylene dicyclohexyl diisocyanate (MDI), an isocyanaurate of hydrogenated methylene dicyclohexyl diisocyanate (HMDI), or an isocyanaurate of toluene diisocyanate (TDI).
The photopolymerizable resin according to claim 0, wherein the biuret is a biuret of hexamethylene diisocyanate (HDI), a biuret of isophorone diisocyanate (IDI), a biuret of methylene dicyclohexyl diisocyanate (MDI), a biuret of hydrogenated methylene dicyclohexyl diisocyanate (HMDI), or a biuret of toluene diisocyanate (TDI).
The photopolymerizable resin according to claim 0, wherein the allophanate is an allophanate of hexamethylene diisocyanate (HDI), an allophanate of isophorone diisocyanate (IDI), an allophanate of methylene dicyclohexyl diisocyanate (MDI), an allophanate of hydrogenated methylene dicyclohexyl diisocyanate (HMDI), or an allophanate of toluene diisocyanate (TDI).
The photopolymerizable resin according to claim 0, wherein the blocked isocyanate includes an isocyanate and a blocking agent.
The photopolymerizable resin according to claim 0, wherein the isocyanate is configured to react with the blocking agent, such that isocyanate functional groups of the isocyanate are end capped.
(canceled)
The photopolymerizable resin according to claim 0, wherein the blocking agent includes at least one of a nucleophile, derivatives of alcohols, hindered amines, caprolactams, phenols, oximes, or pyrazoles malonates.
The resin mixture according to claim 0, wherein the components of the resin mixture are configured to react by exposure to light to form a cured material.
The resin mixture according to claim 0, wherein the blocked isocyanate is configured to liberate the reactive isocyanate functionality during or after exposure of the resin mixture to light.
The resin mixture according to claim 0, wherein the at least one monomer or oligomer includes one or more acrylic monomers.
The resin mixture according to claim 0, wherein the one or more acrylic monomers are at least about 35% by weight of the resin.
The resin mixture according to claim 0, further comprising less than about 5% of a stabilized thiol comprising one or more thiol functional groups.
The resin mixture according to claim 0, further comprising at least one of a photoinitiator, an inhibitor, a dye, or a filler.
The resin mixture according to claim 0, wherein the photoinitiator is about 0.01-3% by weight of the resin.
(canceled)
The resin mixture according to claim 0, wherein the resin is configured for continuous use in a 3D printing operation in an air environment for a period of about 10 weeks without an increase in viscosity of more than 25%.
(canceled)
The resin mixture according to claim 0, wherein the stabilized thiol includes a bulky side chain.
The resin mixture according to claim 0, wherein the stabilized thiol includes at least one of a difunctional thiol, trifunctional thiol, tetrafunctional thiol, or multi-functional thiol.
The resin mixture according to claim 0, wherein the stabilized thiol includes at least one of a Pentaerythritol tetrakis (3-mercaptobutylate);
- or 1,4-bis (3-mercaptobutylyloxy) butane.
182-351. (canceled)
Dependencies are inferred from the claim text.