	US 11,970,565 B2
	HCFO-containing isocyanate-reactive compositions, related foam-forming compositions and flame retardant PUR-PIR foams
Michael H. Bell, McMurray, PA (US); Brandon W. Parks, McKees Rocks, PA (US); and Eric C. Giles, Pittsburgh, PA (US)
Assigned to Covestro LLC, Pittsburgh, PA (US)
Filed by Covestro LLC, Pittsburgh, PA (US)
Filed on Jun. 27, 2023, as Appl. No. 18/214,598.
Application 18/214,598 is a division of application No. 17/341,898, filed on Jun. 8, 2021, granted, now 11,732,081.
Prior Publication US 2023/0340181 A1, Oct. 26, 2023
Int. Cl. C08G 18/40 (2006.01); C08G 18/20 (2006.01); C08G 18/76 (2006.01); C08J 9/08 (2006.01); C08J 9/12 (2006.01); C08J 9/14 (2006.01); C08L 67/03 (2006.01)

CPC C08G 18/4018 (2013.01) [C08G 18/2081 (2013.01); C08G 18/7685 (2013.01); C08J 9/08 (2013.01); C08J 9/125 (2013.01); C08J 9/144 (2013.01); C08L 67/03 (2013.01); C08J 2375/06 (2013.01); C08J 2375/08 (2013.01)]

20 Claims

1. A foam-forming reaction mixture comprising:

(a) a polyisocyanate;

(b) a polyol blend comprising:

(1) an aromatic polyester polyol (I) having a functionality of 1.5 to less than 2.5 and an OH number of 150 to 360 mg KOH/g;

(2) an aromatic polyester polyol (II) having a functionality of at least 2.5 and an OH number greater than 360 mg KOH/g, which is present in an amount of at least 10% by weight, based on total weight of the aromatic polyester polyol in the polyol blend; and

(3) an amine-initiated polyether polyol having an OH number of at least 500 mg KOH/g and a functionality of 2.5 to 4,

wherein aromatic polyester polyol is present in an amount of at least 50% by weight, based on total weight of the polyol blend;

(1) a hydrochlorofluoroolefin; and

(2) a carbon dioxide generating chemical blowing agent; and

(d) a tertiary amine catalyst,

wherein the reaction mixture has an isocyanate index of 90 to 150.