# US 12,005,612 B2 · Transparent stretchable substrate and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,005,612 B2 - Document ID: US12005612B2 - Status: Granted - Kind: B2 - Application number: 17/177,856 - Filed: 2021-02-17 - Published: 2022-05-26 - Granted: 2024-06-11 - Earliest claimed: 2020-11-25 - Assignees: Korea Institute of Science and Technology - Applicants: Korea Institute of Science and Technology - Inventors: Seungjun Chung; Phillip Lee; Seung Hyun Lee; Seong Kwon Hwang; Hyunjoo Cho; Jeong Gon Son; Jai Kyeong Kim; Heesuk Kim; Sang-Soo Lee; Tae Ann Kim; Jong Hyuk Park - Web page: https://patentgrep.com/patent/US12005612B2 ## CPC - B29C 35/02: Heating or curing, e.g. crosslinking or vulcanizing {during moulding, e.g. in a mould}(cold vulcanisation B29C35/18 {; vulcanising tyres, presses therefor B29D30/0601}) - B29C 35/002: {Component parts, details or accessories; Auxiliary operations} - B32B 7/022: Mechanical properties - B32B 37/144: {using layers with different mechanical or chemical conditions or properties, e.g. layers with different thermal shrinkage, layers under tension during bonding (constructional features for tensioning B32B38/1825)} - B32B 38/08: Impregnating - B32B 38/145: {Printing} - H05K 1/0283: {Stretchable printed circuits} - H05K 1/03: Use of materials for the substrate - B29K 2995/0094: Geometrical properties - B32B 2038/0076: {Curing, vulcanising, cross-linking} - B32B 2307/51: Elastic - B32B 2319/00: Synthetic rubber - H05K 2201/09681: Mesh conductors, e.g. as a ground plane - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract Disclosed is a method of manufacturing a transparent stretchable substrate according to various embodiments of the present disclosure. The method may include generating a substrate part formed of an elastic material, generating an auxetic including a plurality of unit structures on the substrate part, and generating a fixing part on the substrate part on which the auxetic is generated. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The method of claim 1, wherein in response to an external force generated with respect to one axis, each of the plurality of unit structures causes deformation of the auxetic with respect to an other axis, and wherein when the external force is applied to the auxetic with respect to the one axis, a strain related to the other axis is depending on the mechanical strength of the auxetic. ### Claim 3 (depends on 2) The method of claim 2, wherein the other axis comprises at least one of a first axis located perpendicular to the one axis on the same plane and a second axis based on a plane perpendicular to the same plane. ### Claim 4 (depends on 1) The method of claim 1, wherein the generating of the auxetic comprises performing a printing process utilizing an elastic material. ### Claim 5 (depends on 4) The method of claim 4, wherein the generating of the auxetic further comprises: performing first curing; and performing second curing; and the performing of the second curing proceeds at a higher temperature than the performing of the first curing. ### Claim 6 (depends on 5) The method of claim 5, wherein the generating of the fixing part comprises: supplying the fixing part in a liquid state to the substrate part coupled to the auxetic; and performing third curing, and the performing of the third curing proceeds at a lower temperature than the performing of the second curing. ### Claim 7 (depends on 1) The method of claim 1, wherein the auxetic has a higher strength than those of the substrate part and the fixing part. ### Claim 8 (depends on 1) The method of claim 1, wherein the auxetic has a plurality of partitioned regions, and each of the partitioned regions has different intervals or thicknesses of auxetic structures.