US 11,814,466 B2
Hydrophilic polyurethane foam for water
Cody Schoener, Lake Jackson, TX (US); and Yasmin N. Srivastava, Sugarland, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/277,505
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Sep. 17, 2019, PCT No. PCT/US2019/051573
§ 371(c)(1), (2) Date Mar. 18, 2021,
PCT Pub. No. WO2020/068495, PCT Pub. Date Apr. 2, 2020.
Claims priority of provisional application 62/738,203, filed on Sep. 28, 2018.
Prior Publication US 2022/0033564 A1, Feb. 3, 2022
Int. Cl. C08G 18/08 (2006.01); C08G 18/12 (2006.01); C08G 18/18 (2006.01); C08G 18/06 (2006.01); E03F 5/10 (2006.01); C08G 18/48 (2006.01); C08G 101/00 (2006.01)
CPC C08G 18/14 (2013.01) [C08G 18/12 (2013.01); C08G 18/485 (2013.01); C08G 2101/00 (2013.01); C08G 2110/0008 (2021.01); C08G 2110/0058 (2021.01); C08G 2110/0075 (2021.01); C08G 2110/0083 (2021.01)] 11 Claims
 
1. A water containment system comprising a hydrophilic polyurethane foam which is the reaction product of a reaction mixture that comprises:
a) water,
b) a quasi-prepolymer, which quasi-prepolymer has an isocyanate content of 5 to 15% by weight and contains 55 to 75 weight percent of oxyethylene units based on the weight of the quasi-prepolymer, which quasi-prepolymer is a reaction product of 1) a hydroxyl-terminated polymer of ethylene oxide or mixture of two or more thereof, wherein the hydroxyl-terminated polymer of ethylene oxide or mixture thereof has an average oxyethylene content of at least 90 weight percent, based on the weight of the hydroxyl-terminated polymer of ethylene oxide or mixture thereof, has a number average nominal hydroxyl functionality of 2 to 2.5 and has a number average hydroxyl equivalent weight of at least 350, with ii) an excess of an organic polyisocyanate that includes at least 80 weight percent diphenylmethane diisocyanate of which diphenylmethane diisocyanate at least 60 weight percent is 4,4′-diphenylmethane diisocyanate, wherein component b) is present in an amount sufficient to provide an isocyanate index of 0.5 to 50; and
c) one or more surfactants.