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AssigneeQuadratic 3D, Inc.
InventorsSAMUEL N. SANDERS, EMILY M. ARNDT, ELANGO KUMARASAMY, GAVIN R. KIEL
Estimating the term…
Photoswitchable photoinitiators comprising a photochromic molecule including one or more substituents and including a polycyclic group attached to the photochromic molecule as a substituent or to a substituent on the photochromic molecule, the polycyclic group including at least two fused rings of atoms, wherein at least one of the fused rings of atoms includes a carbon atom with a substituent comprising a double bonded oxygen, and wherein the photochromic molecule and polycyclic group have no ring member in common. Photohardenable compositions, hardenable resin compositions, and methods for forming an object, which photohardenable compositions, hardenable resin compositions, and methods include a photoswitchable photoinitiator described herein, are also disclosed.
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A photoswitchable photoinitiator comprising a first unit comprising a photochromic molecule comprising one or more rings of atoms wherein one or more of the rings of atoms includes one or more substituents, and a second unit comprising a polycyclic group including at least two fused rings of atoms, wherein at least one of the fused rings of atoms includes a carbon atom with a substituent comprising a double bonded oxygen, wherein the second unit is attached to the first unit, and wherein the first unit and the second unit lack a ring member that is common to both units.
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A photohardenable composition comprising a photohardenable resin 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 resin component at the intersection of the lights of the two wavelengths, wherein the first and second wavelengths are different, and wherein the photoswitchable photoinitiator comprises a first unit comprising a photochromic molecule comprising one or more rings of atoms wherein one or more of the rings of atoms includes one or more substituents, and a second unit comprising a polycyclic group including at least two fused rings of atoms, wherein at least one of the fused rings of atoms includes a carbon atom with a substituent comprising a double bonded oxygen, wherein the second unit is attached to the first unit, and wherein the first unit and the second unit lack a ring member that is common to both units.
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Dependencies are inferred from the claim text.