Liquid photohardenable composition for volumetric additive manufacturing

A liquid photohardenable composition with a dual-wavelength photoinitiator and thixotrope maintains high light transmittance and yield stress, addressing haziness issues in volumetric 3D printing to ensure precise and clear curing of larger objects.

WO2025189033A1 Publication Date: 2025-09-11QUADRATIC 3D INC
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Patent Information

Application Number
PCT/US2025/018788
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-06
Filing Date
2025-03-06
Publication Date
2025-09-11

AI Technical Summary

Technical Problem

Volumetric 3D printing resins with added thixotropes for non-Newtonian rheological behavior often suffer from reduced light transmittance, affecting print resolution and dimensional accuracy due to haziness and scattering of light, especially in larger objects where light must travel significant distances before curing.

Method used

A liquid photohardenable composition comprising a photohardenable resin, a dual-wavelength photoinitiator, and a thixotrope, with yield stress greater than 5 Pa and light transmittance above 90% for a 5 cm pathlength, maintaining clarity for at least 10 days, ensuring precise and clear curing.

Benefits of technology

The composition achieves high print resolution and dimensional accuracy in larger objects by maintaining light transmittance, allowing for precise and clear curing without scattering, even in larger volumes, enhancing the clarity and stability of printed objects.

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Abstract

A liquid photohardenable composition for volumetric printing including a photohardenable resin component, a dual-wavelength photoinitiator, and a thixotrope,, wherein the liquid photohardenable composition exhibits non-Newtonian rheological behavior and a light transmittance greater than 90% for a 5 centimeter (cm) pathlength. Preferably such transmissivity remains above 90% for at least 10 days after preparation. Preferably the liquid photohardenable composition exhibiting non-Newton rheological behavior has a yield stress greater than or equal to about 5 Pascals at 50 degrees Celsius, Methods of forming an object in a volume of a liquid photohardenable composition of the invention and a method for screening thixotropes for inclusion in a liquid photohardenable composition are also disclosed.
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