Patent ID: 11970565
Assignee: COVESTRO LLC
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
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;

(c) a blowing agent composition comprising:
(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.