Liquid, hybrid UV/VIS radiation curable resin compositions for additive fabrication
First Claim
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1. A liquid radiation curable composition for additive fabrication comprising, relative to the weight of the entire composition:
- (a) from 10 to 80 wt. % of a cationically polymerizable component comprising a cycloaliphatic epoxide and an oxetane;
(b) from 0.1 to 10 wt. % of an iodonium salt cationic photoinitiator;
(c) from 0.1 to 10 wt. % of a photosensitizer for photosensitizing component (b);
(d) from 1 to 8 wt. % of a first reductant for reducing component (b);
(e) up to 50 wt. % of a free-radically polymerizable component;
(f) optionally, a free-radical photoinitiator; and
(g) from 1 to 25 wt. % of a second reductant for reducing component (b) possessing an electron-donating substituent attached to a vinyl group;
wherein the composition possesses a cycloaliphatic epoxide T95 value, a cycloaliphatic epoxide plateau conversion, an oxetane T95 value, and an oxetane plateau conversion;
wherein the cycloaliphatic epoxide T95 value of the composition is less than about 70 seconds, the cycloaliphatic plateau conversion of the composition is greater than about 20%;
the oxetane T95 value of the composition is less than about 48 seconds, and the oxetane plateau conversion of the composition is greater than about 29%;
wherein the cycloaliphatic epoxide T95 value, the cycloaliphatic epoxide plateau conversion, the oxetane T95 value, and the oxetane plateau conversion of the composition are each measured by Real Time Fourier Transform Infrared (FTIR) spectroscopy upon subjecting the composition to UV/vis optics emitting radiation with a peak spectral output at 400 nm and an irradiance at a surface of the composition of 2 mW/cm2 for 10 seconds.
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Abstract
Liquid radiation curable compositions are disclosed which are suitable for hybrid (i.e. cationic and free-radical) polymerization when processed via additive fabrication equipment utilizing sources of actinic radiation with peak spectral intensities in the UV/vis region. Also disclosed are methods of creating three-dimensional parts via additive fabrication processes utilizing sources of actinic radiation with peak spectral intensities in the UV/vis region employing liquid radiation curable compositions suitable for hybrid polymerization, and the parts cured therefrom.
36 Citations
20 Claims
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1. A liquid radiation curable composition for additive fabrication comprising, relative to the weight of the entire composition:
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(a) from 10 to 80 wt. % of a cationically polymerizable component comprising a cycloaliphatic epoxide and an oxetane; (b) from 0.1 to 10 wt. % of an iodonium salt cationic photoinitiator; (c) from 0.1 to 10 wt. % of a photosensitizer for photosensitizing component (b); (d) from 1 to 8 wt. % of a first reductant for reducing component (b); (e) up to 50 wt. % of a free-radically polymerizable component; (f) optionally, a free-radical photoinitiator; and (g) from 1 to 25 wt. % of a second reductant for reducing component (b) possessing an electron-donating substituent attached to a vinyl group; wherein the composition possesses a cycloaliphatic epoxide T95 value, a cycloaliphatic epoxide plateau conversion, an oxetane T95 value, and an oxetane plateau conversion; wherein the cycloaliphatic epoxide T95 value of the composition is less than about 70 seconds, the cycloaliphatic plateau conversion of the composition is greater than about 20%;
the oxetane T95 value of the composition is less than about 48 seconds, and the oxetane plateau conversion of the composition is greater than about 29%;wherein the cycloaliphatic epoxide T95 value, the cycloaliphatic epoxide plateau conversion, the oxetane T95 value, and the oxetane plateau conversion of the composition are each measured by Real Time Fourier Transform Infrared (FTIR) spectroscopy upon subjecting the composition to UV/vis optics emitting radiation with a peak spectral output at 400 nm and an irradiance at a surface of the composition of 2 mW/cm2 for 10 seconds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification