US 11,939,338 B2
Spiropyran composite having improved mechano-sensitivity, method for manufacturing the same, and chromic article including the same
Jaewoo Kim, Jeollabuk-do (KR); Jun Young Jo, Jeollabuk-do (KR); Yong Chae Jung, Jeollabuk-do (KR); Yong Seok Choi, Jeollabuk-do (KR); Han Gyeol Jang, Jeollabuk-do (KR); Sungmin Jung, Jeollabuk-do (KR); and Dong Woo Kim, Jeollabuk-do (KR)
Assigned to Korea Institute of Science and Technology, Seoul (KR)
Filed by KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed on Apr. 12, 2021, as Appl. No. 17/228,109.
Claims priority of application No. 10-2020-0161580 (KR), filed on Nov. 26, 2020.
Prior Publication US 2022/0162223 A1, May 26, 2022
Int. Cl. C09K 9/02 (2006.01); C07D 491/107 (2006.01); C08L 83/04 (2006.01)
CPC C07D 491/107 (2013.01) [C08L 83/04 (2013.01); C09K 9/02 (2013.01); C09K 2211/1033 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A sensitivity-enhanced spiropyran composite comprising:
(a) spiropyran; and a polymer, an inorganic material or a mixture thereof covalently bound to the spiropyran thereby forming a spiropyran composite, and
(b) a sensitivity enhancing agent to improve sensitivity to mechanical stimulation, partially or totally impregnated at the inner part or the surface of the spiropyran composite which converts the spiropyran composite into a non-polar state thereby forming the sensitivity-enhanced spiropyran composite,
wherein the sensitivity enhancing agent induces isotropic expansion such that the volume ratio of the spiropyran composite prior to impregnation and the sensitivity-enhanced spiropyran composite after impregnation is 1:1.1-2.0;
wherein the sensitivity enhancing agent is selected from a non-polar solvent, an organic material, and an inorganic material and has a relative dielectric constant of 33 or less; and
wherein the sensitivity enhancing agent is impregnated by wet filtration into the spiropyran composite for 1-15 minutes.