	US 12,391,792 B2
	Hardener formulation for cold curing epoxy systems
Markus Schroetz, Ochsenhausen (DE)
Assigned to BLUE CUBE IP LLC, St. Louis, MO (US)
Appl. No. 18/040,566
Filed by BLUE CUBE IP LLC, St. Louis, MO (US)
PCT Filed Jul. 29, 2021, PCT No. PCT/US2021/043741 § 371(c)(1), (2) Date Feb. 3, 2023, PCT Pub. No. WO2022/031517, PCT Pub. Date Feb. 10, 2022.
Claims priority of provisional application 63/061,422, filed on Aug. 5, 2020.
Prior Publication US 2023/0220150 A1, Jul. 13, 2023
Int. Cl. C08L 63/02 (2006.01); C08G 59/18 (2006.01); C08G 59/24 (2006.01); C08G 59/32 (2006.01); C08G 59/50 (2006.01); C08G 59/68 (2006.01); C08K 5/42 (2006.01); C08L 63/04 (2006.01)

CPC C08G 59/184 (2013.01) [C08K 5/42 (2013.01); C08L 63/04 (2013.01)]

13 Claims

1. A curable composition comprising:

(a) at least one liquid epoxy resin selected from the group consisting of bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, a novolac epoxy resin, and mixtures thereof; and

(b) a hardener composition comprising:

(1) from about 5 weight percent to about 50 weight percent, based on the total weight of the hardener composition, of a first epoxy-amine adduct,

(2) from about 2 weight percent to about 30 weight percent, based on the total weight of the hardener composition, of a second epoxy-amine adduct, and

(3) from about 1 weight percent to about 15 weight percent, based on the total weight of the hardener composition, of an accelerator component comprising methanesulfonic acid;

wherein the first epoxy-amine adduct is provided as an epoxy-amine adduct composition comprising about 30% to about 90% by weight of an adduct of bisphenol A diglycidyl ether and isophorone diamine and about a weight balance of unreacted isophorone diamine;

wherein the second epoxy-amine adduct is provided as an epoxy-amine adduct composition comprising about 30% to about 90% by weight of an adduct of bisphenol A diglycidyl ether and m-xylylenediamine and about a weight balance of unreacted m-xylylenediamine; and

wherein a ratio of the epoxy-equivalent in (a) to the amine-hydrogen equivalent in (b) is from about 1:0.5 to about 1:1.5.

5. The curable composition of claim 1, wherein the hardener composition further comprises a solvent component comprising at least one high boiling point solvent selected from the group consisting of benzyl alcohol, fatty alcohols, and (alpha-methyl) styrenated phenol(s).

7. The curable composition of claim 5, wherein the hardener composition comprises from about 10 weight percent to about 60 weight percent, based on the total weight of the hardener composition, of the solvent component.