Photoinitiators, photohardenable compositions, and methods for forming an object in a volume
AssigneeQuadratic 3D, Inc.
InventorsSamuel N. Sanders, Emily M. Arndt
Life of this patent
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Abstract
Photoswitchable photoinitiators comprising a naphthopyran molecule including one or more substituents wherein at least one substituent comprises a substituted or unsubstituted diaryl ketone moiety are disclosed. Photohardenable compositions and methods for forming an object in a volume and products thereof, which photohardenable compositions and methods include such photoswitchable photoinitiator, are also disclosed.
Claims23
A photohardenable composition comprising a photohardenable component and a photoswitchable photoinitiator, wherein the photoswitchable photoinitiator is activatable by exposure to light having a first wavelength and light having a second wavelength to induce a crosslinking or polymerization reaction in the photohardenable component, wherein the first and second wavelengths are different, and wherein the photoswitchable photoinitiator comprises a naphthopyran molecule including one or more substituents wherein at least one substituent comprises a substituted or unsubstituted diaryl ketone moiety represented by general formula (A):
- wherein Z and Z′ are the same or different and are independently a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group.
A method of printing an object comprising:
- (a) providing a volume including a photohardenable composition comprising a photohardenable component and a photoswitchable photoinitiator, wherein the photoswitchable photoinitiator is activatable by exposure to light having a first wavelength and light having a second wavelength to induce a crosslinking or polymerization reaction in the photohardenable component, wherein the first and second wavelengths are different, and wherein the photoswitchable photoinitiator comprises a naphthopyran molecule including one or more substituents wherein at least one substituent comprises a substituted or unsubstituted diaryl ketone moiety represented by general formula (A):
- wherein Z and Z′ are the same or different and are independently a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group;
- (b) simultaneously or sequentially irradiating one or more selected locations within the volume of the photohardenable composition with light having a first wavelength and light having a second wavelength, wherein light having the first wavelength and light having the second wavelength activate the photoswitchable photoinitiator at the one or more selected locations and at least partially harden the photohardenable composition at the one or more selected locations within the volume to at least partially form the object, wherein the object at least partially formed in the photohardenable composition remains at a fixed position or is minimally displayed in the unhardened photohardenable composition during formation;
- and
- (c) optionally repeating step b, irradiating the photohardenable composition at one or more of the same or different locations in the volume until the object is partially or fully formed.
A photoswitchable photoinitiator comprising a naphthopyran molecule including one or more substituents wherein at least one substituent comprises a substituted or unsubstituted diaryl ketone moiety represented by general formula (A):
- wherein Z and Z′ are the same or different and are independently a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group.
Dependencies are inferred from the claim text.