US 12,460,065 B2
Thermal interface materials based on two-part polyurethanes
Stanley Shengqian Kong, Bridgewater, NJ (US); Valerie Alexis, Bridgewater, NJ (US); Maria Cristina Barbosa Dejesus, Bridgewater, NJ (US); Claudia Meckel-Jonas, Duesseldorf (DE); Elizabeth Jackson, Minneapolis, MN (US); and Chunyong Wu, Chanhassen, MN (US)
Assigned to Henkel AG & Co. KGaA, Duesseldorf (DE)
Filed by Henkel AG & Co. KGaA, Duesseldorf (DE)
Filed on Aug. 13, 2021, as Appl. No. 17/445,012.
Application 17/445,012 is a continuation of application No. PCT/US2020/019588, filed on Feb. 25, 2020.
Claims priority of provisional application 62/810,157, filed on Feb. 25, 2019.
Prior Publication US 2021/0371620 A1, Dec. 2, 2021
Int. Cl. C08K 3/22 (2006.01); C08G 18/22 (2006.01); C08G 18/48 (2006.01)
CPC C08K 3/22 (2013.01) [C08G 18/227 (2013.01); C08G 18/4812 (2013.01); C08G 18/4825 (2013.01); C08G 18/4829 (2013.01); C08K 2003/2227 (2013.01); C08K 2201/001 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A composition comprising a polyurethane resin and a thermally conductive filler, wherein the polyurethane resin is formed from two parts comprising:
a first part comprising a triol and a first thermally conductive filler; and
a second part comprising an isocyanate-functionalized component and a second thermally conductive filler,
wherein:
the first thermally conductive filler is present in the first part in an amount of from 35 wt. % to 95 wt. %, based on the total weight of the first part,
the second thermally conductive filler is present in the second part in an amount of from 85 wt. % to 95 wt. %, based on the total weight of the second part,
the molar ratio of NCO groups to OH groups in the composition is less than 1.3, and
the first thermally conductive filler and the second thermally conductive filler are dispersed throughout the polyurethane resin.