US 12,352,464 B2
Multi-surface passive cooling articles
Timothy J. Hebrink, Scandia, MN (US); Ryan J. Rogers, Shoreview, MN (US); and Milind B. Sabade, Woodbury, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/779,921
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 16, 2020, PCT No. PCT/IB2020/062038
§ 371(c)(1), (2) Date May 25, 2022,
PCT Pub. No. WO2021/137080, PCT Pub. Date Jul. 8, 2021.
Claims priority of provisional application 62/955,800, filed on Dec. 31, 2019.
Prior Publication US 2023/0008147 A1, Jan. 12, 2023
Int. Cl. F24F 5/00 (2006.01); E04F 13/12 (2006.01); F24S 20/66 (2018.01); F28F 13/18 (2006.01)
CPC F24F 5/0075 (2013.01) [E04F 13/12 (2013.01); F24S 20/66 (2018.05); F28F 13/18 (2013.01); F24F 2005/0082 (2013.01); F28F 2245/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A passive cooling article comprising:
a plurality of first elements defining first element outer surfaces, the plurality of first elements defining a first absorbance of greater than or equal to 0.6 in an atmospheric window wavelength range from 8 to 13 micrometers and defining a first average reflectance of greater than or equal to 80% in a solar wavelength range from 0.4 to 2.5 micrometers; and
a plurality of second elements defining second element outer surfaces, the plurality of second elements defining a second absorbance of less than or equal to 0.5 in the atmospheric window wavelength range and defining a second average reflectance of greater than or equal to 60% in the solar wavelength range;
wherein the plurality of first elements and the plurality of second elements are interspersed to form a major structure having a first major surface comprising the first element outer surfaces and the second element outer surfaces and a second major surface opposing the first major surface;
wherein the major structure has a first end region and a second end region, wherein the first element outer surfaces face a first direction toward the first end region and the second element outer surfaces face a second direction toward the second end region;
wherein the plurality of second elements comprises one or more of the following: a dense polyethylene layer, a dense polyethylene copolymer layer, a microporous polyethylene layer, a microporous polyethylene copolymer layer, a fluoropolymer layer defining a thickness less than or equal to 10 micrometers, a coating comprising metal, an infrared mirror film at least partially defining the second absorbance in the atmospheric window wavelength range, a graphic layer at least partially defining the second absorbance in the atmospheric window wavelength range, a graphic layer at least partially covered by an infrared mirror film at least partially defining the second absorbance in the atmospheric window wavelength range, and a metal layer at least partially defining the first reflectance in the solar wavelength range;
wherein at least some of the plurality of first elements comprises first supporting layers and first outer layers, the first outer layers at least partially defining the first absorbance and at least partially covering an outer surface of the first supporting layers to at least partially define the first element outer surfaces, wherein at least some of the plurality of second elements comprises second supporting layers and second outer layers, the second outer layers at least partially defining the second absorbance and at least partially covering an outer surface of the second supporting layers to at least partially define the second element outer surfaces; and
wherein the passive cooling article is a composite film, each of the first and second outer layers and first and second supporting layers being a film layer of the composite film.