US 12,258,463 B2
Method of geoengineering to reduce solar radiation
Lloyd Anthony Lobo, Lincoln University, PA (US); and Mridula Nair, Penfield, NY (US)
Assigned to EASTMAN KODAK COMPANY, Rochester, NY (US)
Filed by Eastman Kodak Company, Rochester, NY (US)
Filed on Jan. 28, 2022, as Appl. No. 17/586,876.
Claims priority of provisional application 63/155,356, filed on Mar. 2, 2021.
Prior Publication US 2022/0282068 A1, Sep. 8, 2022
Int. Cl. A01G 15/00 (2006.01); C08L 1/02 (2006.01); G05D 25/00 (2006.01)
CPC C08L 1/02 (2013.01) [A01G 15/00 (2013.01); G05D 25/00 (2013.01)] 12 Claims
 
1. A method of geoengineering to facilitate the reduction of solar radiation impacting Earth's surface, comprises:
introducing a plurality of porous polymeric particles into Earth's stratosphere at an average distance of at least 10 kilometers above sea level,
wherein each of the plurality of porous particles comprises a continuous polymeric phase composed of one or more organic polymers, and discrete pores dispersed within the continuous polymeric phase, and
each of the plurality of porous particles has the following properties:
a mode particle size is a number within the range of at least 2 μm and up to and including 20 μm, wherein the mode particle size represents the most frequently occurring diameter for spherical particles and the most frequently occurring largest chord length for any non-spherical particles in a particle size distribution histogram for the plurality of porous particles;
a coefficient of variance of the particle size of no more than 20% compared to the mode particle size; and
a porosity of at least 20% and up to and including 75%; and
the discrete pores have an average pore size d (in nanometers) that is defined using the equation: 0.3≤d/λ≤0.8 wherein λ is at least 400 nm and up to and including 3,000 nm; and
wherein each of the discrete pores is filled with air.