HCFO-containing polyurethane foam-forming compositions, related foams and methods for their production

Patent metadata

Field	Value
Publication number	US-11767394-B2
Application number	US-202117546116-A
Country	US
Kind code	B2
Filing date	Dec 9, 2021
Priority date	Dec 9, 2021
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

Polyurethane foam-forming compositions, methods of producing polyurethane foams, polyurethane foams produced from such compositions made by such methods, as well as isocyanate-reactive compositions. The polyurethane foam-forming compositions include a polyol blend, a blowing agent composition, and a polyisocyanate. The polyol blend includes an aromatic amine-initiated polyether polyol, a saccharide-initiated polyether polyol, and an aromatic polyester polyol and has a content of —C 2 H 4 O— units of 3 to 6% by weight, based on the total weight of the polyurethane foam-forming composition. The blowing agent composition includes a hydrochlorofluoroolefin and a carbon dioxide-generating chemical blowing agent.

First claim

What is claimed is:

1. A polyurethane foam-forming composition comprising:
(a) a polyol blend comprising:
(1) at least 30% by weight, based on total weight of the polyol blend, of an aromatic amine-initiated polyether polyol having a functionality of at least 2.5 and an OH number of 200 to 600 mg KOH/g;
(2) at least 30% by weight, based on total weight of the polyol blend, of a saccharide-initiated polyether polyol having a functionality of 4 to 6 and an OH number of 200 to 600 g/KOH gram; and
(3) 1 to 25% by weight, based on total weight of the polyol blend, of an aromatic polyester polyol having a functionality of 1.5 to 3 and an OH number of 150 to 410 mg KOH/g,
wherein the polyol blend has a content of —C 2 H 4 O— units of 3 to 6% by weight, based on the total weight of the polyurethane foam-forming composition;

(b) a blowing agent composition comprising:
(1) a physical blowing agent and
(2) a carbon dioxide-generating chemical blowing agent,
wherein:
(i) the physical blowing agent comprises a hydrochlorofluoroolefin that is present in an amount of 5% to 15% by weight, based on total weight of the polyurethane foam-forming composition, and in an amount of at least 90% by weight, based on total weight of physical blowing agent in the blowing agent composition, and
(ii) the physical blowing agent composition and the carbon dioxide generating chemical blowing agent are present in a relative ratio, by weight, of 5:1 to 50:1; and

(c) a polyisocyanate present in an amount sufficient to provide an isocyanate index of 1.15 to less than 1.40.

2. The polyurethane foam-forming composition of claim 1 , wherein the aromatic amine-initiated polyether polyol has a content of —C 2 H 4 O— units of less than 10% by weight, based on total weight of the aromatic amine-initiated polyether polyol.

3. The polyurethane foam-forming composition of claim 1 , wherein the aromatic amine-initiated polyether polyol has a content of —C 2 H 4 O— units of less than 2% by weight, based on total weight of the aromatic amine-initiated polyether polyol.

4. The polyurethane foam-forming composition of claim 1 , wherein the aromatic amine-initiated polyether polyol is present in an amount of 30 to 60% by weight, based on the total weight of the polyol blend.

5. The polyurethane foam-forming composition of claim 1 , wherein the saccharide-initiated polyether polyol has a content of —C 2 H 4 O— units of less than 40% by weight, based on total weight of the saccharide-initiated polyether polyol.

6. The polyurethane foam-forming composition of claim 4 , wherein the saccharide-initiated polyol is present in an amount of 30 to 60% by weight.

7. The polyurethane foam-forming composition of claim 6 , wherein the aromatic polyester polyol is present in an amount of 5 to 25% by weight, based upon the total weight of the polyol blend.

8. The polyurethane foam-forming composition of claim 1 , wherein the aromatic amine-initiated polyether polyol and the saccharide-initiated polyether polyol are present in a weight ratio of 1:1 to 5:1, the aromatic amine-initiated polyether polyol and the aromatic polyester polyol are present in a weight ratio of 1:1 to 5:1, and the saccharide-initiated polyether polyol and the aromatic polyester polyol are present in a weight ratio of 1:1 to 5:1.

9. The polyurethane foam-forming composition of claim 1 , wherein the polyol blend has a content of —C 2 H 4 O— units of 4 to 6% by weight, based on total weight of the polyurethane foam-forming composition.

10. The polyurethane foam-forming composition of claim 1 , wherein the polyol blend does not include a filled polyol.

11. The polyurethane foam-forming composition of claim 1 , wherein the sum of the amount of the aromatic amine-initiated polyether polyol, the saccharide-initiated polyether polyol, and the aromatic polyester polyol is at least 90% by weight, based on the total weight of the polyol blend.

12. The polyurethane foam-forming composition of claim 1 , wherein hydrochlorofluoroolefin is present in amount of at least 95% by weight, based on the total weight of the physical blowing agent in the blowing agent composition.

13. The polyurethane foam-forming composition of claim 12 , wherein the physical blowing agent composition and the carbon dioxide generating chemical blowing agent are present in a relative ratio, by weight, of 5:1 to 20:1.

14. A polyurethane foam produced from the polyurethane foam-forming composition of claim 1 .

15. A method of producing a polyurethane foam, comprising reacting, at an isocyanate index of 1.15 to less than 1.40, a polyurethane foam-forming composition comprising a polyol blend, a polyisocyanate, and a blowing agent composition, wherein:
(a) the polyol blend comprises
(1) at least 30% by weight, based on total weight of the polyol blend, of an aromatic amine-initiated polyether polyol having a functionality of at least 2.5 and an OH number of 200 to 600 mg KOH/g;
(2) at least 30% by weight, based on total weight of the polyol blend, of a saccharide-initiated polyether polyol having a functionality of 4 to 6 and an OH number of 200 to 600 g/KOH gram; and
(3) 1 to 25% by weight, based on total weight of the polyol blend, of an aromatic polyester polyol having a functionality of 1.5 to 3 and an OH number of 150 to 410 mg KOH/g,
wherein the polyol blend has a content of —C 2 H 4 O— units of 3 to 6% by weight, based on the total weight of the polyurethane foam-forming composition;

(b) the blowing agent composition comprises:
(1) a physical blowing agent and
(2) a carbon dioxide-generating chemical blowing agent,
wherein:
(i) the physical blowing agent comprises a hydrochlorofluoroolefin that is present in an amount of 5% to 15% by weight, based on total weight of the polyurethane foam-forming composition and in an amount of at least 90% by weight, based on total weight of physical blowing agent in the blowing agent composition, and
(ii) the physical blowing agent composition and the carbon dioxide generating chemical blowing agent are present in a relative ratio, by weight, of 5:1 to 50:1.

16. The method of claim 15 , wherein the aromatic amine-initiated polyether polyol has a content of —C 2 H 4 O— units of less than 2% by weight, based on total weight of the aromatic amine-initiated polyether polyol.

17. The method of claim 15 , wherein the aromatic amine-initiated polyether polyol is present in an amount of 30 to 60% by weight, based on the total weight of the polyol blend, the saccharide-initiated polyol is present in an amount of 30 to 60% by weight, and the aromatic polyester polyol is present in an amount of 5 to 25% by weight, based upon the total weight of the polyol blend.

18. The method of claim 15 , wherein the sum of the amount of the aromatic amine-initiated polyether polyol, the saccharide-initiated polyether polyol, and the aromatic polyester polyol is at least 90% by weight, based on the total weight of the polyol blend.

19. An isocyanate-reactive composition, comprising:
(a) polyol blend comprising:
(1) at least 30% by weight, based on total weight of the polyol blend, of an aromatic amine-initiated polyether polyol having a functionality of at least 2.5 and an OH number of 200 to 600 mg KOH/g;
(2) at least 30% by weight, based on total weight of the polyol blend, of a saccharide-initiated polyether polyol having a functionality of 4 to 6 and an OH number of 200 to 600 g/KOH gram; and
(3) 1 to 25% by weight, based on total weight of the polyol blend, of an aromatic polyester polyol having a functionality of 1.5 to 3 an

Assignees

• Covestro Llc

Inventors

• Parks Brandon W

Classifications

• C08G18/4018 Primary

  Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48 · CPC title

• C08G18/7692

  containing at least one isocyanate or isothiocyanate group linked to an aromatic ring by means of an aliphatic group · CPC title

• C08J9/08

  developing carbon dioxide · CPC title

• C08J9/147

  containing carbon and halogen atoms only · CPC title

• C08G2101/00

  Manufacture of cellular products · CPC title