US 12,252,619 B2
Additive manufacturing of aromatic thermoplastics from photocurable precursor salts
Daniel Rau, Blacksburg, VA (US); Jana Herzberger, Blacksburg, VA (US); Timothy Long, Blacksburg, VA (US); and Christopher Williams, Blacksburg, VA (US)
Assigned to Virginia Tech Intellectual Properties, Inc., Blacksburg, VA (US)
Appl. No. 16/981,115
Filed by Virginia Tech Intellectual Properties, Inc., Blacksburg, VA (US)
PCT Filed Mar. 30, 2019, PCT No. PCT/US2019/025066
§ 371(c)(1), (2) Date Sep. 15, 2020,
PCT Pub. No. WO2019/191733, PCT Pub. Date Oct. 3, 2019.
Claims priority of provisional application 62/650,370, filed on Mar. 30, 2018.
Prior Publication US 2021/0115279 A1, Apr. 22, 2021
Int. Cl. B33Y 70/00 (2020.01); C08G 69/40 (2006.01); C09D 11/101 (2014.01); C09D 11/102 (2014.01); C09D 11/38 (2014.01); B29C 64/124 (2017.01); B29K 79/00 (2006.01); B33Y 10/00 (2015.01)
CPC C09D 11/102 (2013.01) [B33Y 70/00 (2014.12); C08G 69/40 (2013.01); C09D 11/101 (2013.01); C09D 11/38 (2013.01); B29C 64/124 (2017.08); B29K 2079/08 (2013.01); B33Y 10/00 (2014.12)] 17 Claims
OG exemplary drawing
 
1. A polymer resin for ultraviolet-assisted direct ink write photopolymerization, the polymer resin comprising:
(i) a polyamic acid salt comprising repeat units having a structure according to the following formula:

OG Complex Work Unit Chemistry
wherein each occurrence of R″ comprises a photocrosslinkable group selected from the group having a structure according to the following formulas:

OG Complex Work Unit Chemistry
wherein each occurrence of R is independently selected from the group consisting of H, substituted and unsubstituted alkyl, substituted and unsubstituted heteroalkyl, and substituted and unsubstituted alkenyl;
wherein each occurrence of Ar is independently selected from the group

OG Complex Work Unit Chemistry
wherein each occurrence of X is a substituted or unsubstituted aryl or heteroaryl group; and
wherein each occurrence of Y is independently selected from the group consisting of O, S, C═O, C(CF3)2, C(CH3)2, SO2, and C≡C;
(ii) a photoinitiator suitable for initiating crosslinking of the photocrosslinkable groups when exposed to a light source of a suitable wavelength and intensity; and
(iii) a suitable solvent.