High modulus, high thermal conductivity radiative passive coolant
US11878493B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2022 |
| Grant date | Jan 23, 2024 |
| Priority date | — |
| Expiry date | Jun 17, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2551/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A polymer bilayer includes a layer of a porous fluoropolymer directly overlying a layer of polyethylene. The polyethylene layer may be porous or dense and may include an ultra-high molecular weight polymer. The polymer bilayer may be co-integrated with structures (e.g., wearable devices) exposed to high thermal loads (>0-1000 W/m2) and provide passive cooling thereof. For instance, passive cooling of AR/VR glasses under different solar loads may be achieved by a polymer bilayer that is both highly reflective across solar heating wavelengths and highly emissive in the long-wavelength infrared. The high reflectance decreases energy absorption across the solar spectrum while the high emissivity promotes radiative heat transfer to the surroundings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.