US 12,441,049 B2
3D printing of seal caps
Bryan W. Wilkinson, Pittsburgh, PA (US); Michael A. Bubas, Pittsburgh, PA (US); and Renhe Lin, Stevenson Ranch, CA (US)
Assigned to PPG Industries Ohio, Inc., Cleveland, OH (US)
Appl. No. 17/429,933
Filed by PPG Industries Ohio, Inc., Cleveland, OH (US)
PCT Filed Feb. 10, 2020, PCT No. PCT/US2020/017441
§ 371(c)(1), (2) Date Aug. 10, 2021,
PCT Pub. No. WO2020/167633, PCT Pub. Date Aug. 20, 2020.
Claims priority of provisional application 62/803,682, filed on Feb. 11, 2019.
Prior Publication US 2022/0176617 A1, Jun. 9, 2022
Int. Cl. B29C 64/106 (2017.01); B29C 70/74 (2006.01); B29D 99/00 (2010.01); B29L 31/26 (2006.01); B33Y 10/00 (2015.01); B33Y 40/20 (2020.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01); F16B 33/00 (2006.01); F16B 37/14 (2006.01)
CPC B29C 64/106 (2017.08) [B29C 70/74 (2013.01); B29D 99/0053 (2013.01); F16B 33/004 (2013.01); F16B 37/14 (2013.01); B29L 2031/26 (2013.01); B33Y 10/00 (2014.12); B33Y 40/20 (2020.01); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12)] 8 Claims
OG exemplary drawing
 
1. A method of sealing a fastener, comprising:
depositing successive layers comprising a first coreactive composition directly onto the fastener by three-dimensional printing, the first coreactive composition comprising a first reactive component and a second reactive component
wherein the successive layers are deposited to form a seal cap; and
at least one of:
depositing a second coreactive composition directly onto the first coreactive composition to form a seal cap shell over the first coreactive composition;
simultaneously depositing successive layers of the first coreactive composition and a second coreactive composition onto the fastener, wherein the second coreactive composition forms a seal cap shell; and
applying a seal cap shell onto an outermost deposited first coreactive composition, wherein the seal cap shell comprises an at least partially cured second coreactive composition;
wherein each of the first coreactive composition and the second coreactive composition independently comprise from 40 wt % to 80 wt % of a sulfur-containing prepolymer; and
wherein the sulfur-containing prepolymer comprises a polythioether, a polysulfide, a sulfur-containing polyformal, a monosulfide, or a combination of any of the foregoing.