	US 12,234,342 B2
	Carbon nano materials in crosslinked polyurethane and polyurea applications with optimized properties
Santosh K. Yadav, Geneva, OH (US); and Paul A. Rettinger, Ashtabula, OH (US)
Assigned to Chromaflo Technologies Corporation, Ashtabula, OH (US)
Filed by Chromaflo Technologies Corporation, Ashtabula, OH (US)
Filed on Oct. 3, 2022, as Appl. No. 17/937,589.
Claims priority of provisional application 63/251,149, filed on Oct. 1, 2021.
Prior Publication US 2023/0112515 A1, Apr. 13, 2023
Int. Cl. C08K 3/04 (2006.01); C08J 3/22 (2006.01); H01B 1/24 (2006.01); H05K 9/00 (2006.01)

CPC C08K 3/041 (2017.05) [C08J 3/226 (2013.01); H01B 1/24 (2013.01); H05K 9/0079 (2013.01); C08J 2375/02 (2013.01); C08J 2375/04 (2013.01); C08K 2201/001 (2013.01); C08K 2201/011 (2013.01)]

15 Claims

1. A method of making a crosslinked aliphatic polyurea polymer with rheological and conducting properties, the method comprising:

providing a carbon nanotube masterbatch dispersion comprising from 0.1% to 15% (weight/weight) of carbon nanotubes;

blending an amount of the carbon nanotube masterbatch and a polyol resin to obtain a carbon nanotube polyol resin blend, to afford a concentration of carbon nanotubes in the polyol resin of from 60 ppm to 11000 ppm, and the polyol viscosity is below 4000 cP at a shear rate of 100 s⁻¹, 25° C.;

mixing the carbon nanotube polyol blend and polyisocyanate in a 1:1 polyol: polyisocyanate stoichiometry to form a polymer mixture; and

curing the polymer mixture in a form;

wherein the resulting polymer has electrical resistivity of 10⁴Ω*cm⁻¹or more.