Liquid, hybrid UV/vis radiation curable resin compositions for additive fabrication
First Claim
1. A UV/vis radiation curable composition for additive fabrication comprising:
- a photoinitiating package comprising;
from about 0.1 wt. % to about 15 wt. % of an iodonium salt cationic photoinitiator;
from about 0.1 wt. % to about 8 wt. % of a Norrish Type I photoinitiator;
from about 0.1 wt. % to about 15 wt. % of an accelerator; and
optionally, a photosensitizer;
a cationically curable constituent comprisingfrom about 1 wt. % to about 20 wt. % of an oxetane component;
from about 3 wt. % to about 40 wt. % of a cycloaliphatic epoxide component; and
from about 2 wt. % to about 40 wt. % of a glycidyl ether component;
from about 5 wt. % to about 40 wt. % of a free-radically curable component; and
optionally, up to about 50 wt. % of one or more additives;
wherein the Norrish Type I photoinitiator is an alkyl-, aryl-, or acyl-substituted compound which possesses an atom selected from the group consisting of silicon, germanium, tin, and lead;
wherein the accelerator comprises an electron-donating substituent attached to a vinyl group;
and wherein all weight percentages are listed relative to the weight of the entire composition.
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Accused Products
Abstract
Described herein are thermoset compositions suitable for hybrid polymerization when processed via additive fabrication equipment utilizing sources of actinic radiation with peak spectral intensities in the UV and/or visible region containing a photoinitiating package, a cationically curable constituent, a free-radically curable component, and optionally, one or more additives. Such thermoset compositions preferably contain a Norrish Type I photoinitiator that is an alkyl-, aryl-, or acyl-substituted compound centered around a Group 14 atom, and further possesses specified ranges of ionization potential values with respect to its known triplet state. 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 and/or visible regions employing the claimed thermosetting compositions, along with the parts cured therefrom.
40 Citations
29 Claims
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1. A UV/vis radiation curable composition for additive fabrication comprising:
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a photoinitiating package comprising; from about 0.1 wt. % to about 15 wt. % of an iodonium salt cationic photoinitiator; from about 0.1 wt. % to about 8 wt. % of a Norrish Type I photoinitiator; from about 0.1 wt. % to about 15 wt. % of an accelerator; and optionally, a photosensitizer; a cationically curable constituent comprising from about 1 wt. % to about 20 wt. % of an oxetane component; from about 3 wt. % to about 40 wt. % of a cycloaliphatic epoxide component; and from about 2 wt. % to about 40 wt. % of a glycidyl ether component; from about 5 wt. % to about 40 wt. % of a free-radically curable component; and optionally, up to about 50 wt. % of one or more additives; wherein the Norrish Type I photoinitiator is an alkyl-, aryl-, or acyl-substituted compound which possesses an atom selected from the group consisting of silicon, germanium, tin, and lead; wherein the accelerator comprises an electron-donating substituent attached to a vinyl group; and wherein all weight percentages are listed relative to the weight of the entire composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 28, 29)
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14. A liquid UV/vis radiation curable composition for additive fabrication comprising:
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a photoinitiating package comprising an onium salt cationic photoinitiator; a reductant comprising an effective amount of a Norrish Type I photoinitiator dissolved in a vinyl ether compound that is a liquid at 25 degrees C.; and optionally, a photosensitizer; a cationically polymerizable constituent; a free-radically polymerizable component; and optionally, one or more additives; wherein the Norrish Type I photoinitiator is capable of entering a triplet state upon excitation by exposure to actinic radiation, wherein said excited triplet state possesses an ionization potential of from about 2.5 eV to about 4.15 eV, wherein the ionization potential is calculated in accordance with molecular modeling under B3LYP/6-31G(d) in combination with Koopman'"'"'s Theorem (IP=−
ε
HOMO). - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification