IP Library › Granted Patent US 12,416,594
Granted Patent B2
US 12,416,594 · App. 17/429,802 · Granted Sep 16, 2025

Humidity-sensitive composite material and humidity sensor

Inventors: Yusuke Komazaki (Tsukuba, JP); Sei Uemura (Tsukuba, JP)
Assignee: National Institute of Advanced Industrial Science and Technology
G01N27/121G01N27/125
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Quick Facts
Patent No.
US 12,416,594
App. No.
17/429,802
Granted
Sep 16, 2025
Kind
B2
Abstract

Provided are a stretchable humidity-sensitive composite material for a humidity sensor that can be applied to clothing as wearable device, and the humidity sensor. The humidity-sensitive composite material is characterized by containing a deliquescent inorganic compound in closed pores inside a base material made of a porous silicone resin. The humidity sensor is characterized in that a bulk made of a humidity-sensitive composite material containing a deliquescent inorganic compound in closed pores inside a base material made of a porous silicone resin is sandwiched between a pair of counter electrodes made of a moisture-permeable material.

Claims (10)

1. A humidity sensor, wherein a bulk made of a humidity-sensitive composite material provides the absorption and release of water vapor, containing:

a deliquescent inorganic compound in a base material made of a porous silicone resin, wherein:

the base material containing the deliquescent inorganic compound is sandwiched between a pair of counter electrodes made of a moisture-permeable material,

the base material includes independent closed pores and a deliquescent liquid, comprising water and the deliquescent inorganic compound, retained in each of the independent closed pores inside the base material,

the independent closed pores are non-uniform in size, and

the independent closed pores are located randomly inside the base material.

2. The humidity sensor according to claim 1 , wherein a change in ambient humidity is given by a change in a dielectric constant.

3. The humidity sensor according to claim 2 , wherein the pores are substantially spherical independent pores dispersed.

4. The humidity sensor according to claim 3 , wherein the inorganic compound is a metal chloride.

5. The humidity sensor according to claim 4 , wherein the metal chloride is any one of chlorides of lithium, magnesium, potassium, and calcium or a combination thereof.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 16, 2021
From: KOMAZAKI, YUSUKE; UEMURA, SEI
To: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
Reel/Frame 057193/0378 →
Priority Claims (1)
JP 2019-025696 · Feb 15, 2019 · national
Continuity (1)
Related Publication 20220128501A1 · Apr 28, 2022
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