US 12,005,612 B2
Transparent stretchable substrate and manufacturing method thereof
Seungjun Chung, Seoul (KR); Phillip Lee, Seoul (KR); Seung Hyun Lee, Seoul (KR); Seong Kwon Hwang, Seoul (KR); Hyunjoo Cho, Seoul (KR); Jeong Gon Son, Seoul (KR); Jai Kyeong Kim, Seoul (KR); Heesuk Kim, Seoul (KR); Sang-Soo Lee, Seoul (KR); Tae Ann Kim, Seoul (KR); and Jong Hyuk Park, Seoul (KR)
Assigned to Korea Institute of Science and Technology, Seoul (KR)
Filed by Korea Institute of Science and Technology, Seoul (KR)
Filed on Feb. 17, 2021, as Appl. No. 17/177,856.
Claims priority of application No. 10-2020-0160365 (KR), filed on Nov. 25, 2020.
Prior Publication US 2022/0161462 A1, May 26, 2022
Int. Cl. B29C 35/02 (2006.01); B29C 35/00 (2006.01); B32B 7/022 (2019.01); B32B 37/14 (2006.01); B32B 38/00 (2006.01); B32B 38/08 (2006.01); H05K 1/02 (2006.01); H05K 1/03 (2006.01)
CPC B29C 35/02 (2013.01) [B29C 35/002 (2013.01); B32B 7/022 (2019.01); B32B 37/144 (2013.01); B32B 38/08 (2013.01); B32B 38/145 (2013.01); H05K 1/0283 (2013.01); H05K 1/03 (2013.01); B29K 2995/0094 (2013.01); B32B 2038/0076 (2013.01); B32B 2307/51 (2013.01); B32B 2319/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of manufacturing a transparent stretchable substrate, the method comprising:
generating a substrate part formed of an elastic material;
generating an auxetic having a reentrant structure including a plurality of unit structures, on the substrate part; and
generating a fixing part on the substrate part,
wherein the substrate part, the auxetic, and the fixing part contain the same elastic material, and
wherein
the substrate part and the auxetic further contain a curing agent,
a ratio of the curing agent to the elastic material in the substrate part is a first ratio,
a ratio of the curing agent to the elastic material in the auxetic is a second ratio,
a ratio of the curing agent to the elastic material in the fixing part is a third ratio,
the second ratio is greater than the first ratio and the third ratio, and the first ratio is equal to the third ratio,
the auxetic further includes a plurality of microstructures, each of which is positioned inside a respective unit structure of the plurality of unit structures, and
all of the plurality of microstructures included in the auxetic have the same shape that is consisted of two triangular shapes, which supports an inside of a reentrant shape of the respective unit structure, and minimizes a mechanical deformation distribution generated in response to an external force with respect to one axis.