Flame retarded polyurethane foam

Patent metadata

Field	Value
Publication number	US-11897993-B2
Application number	US-201816625117-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Jun 27, 2017
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

This invention provides flame retardant compositions comprised of or formed from components comprising a sulfur-containing compound and at least one isocyanate-reactive brominated flame retardant.

First claim

That which is claimed is:

1. A flame retardant composition comprised of or formed from components comprising
at least one isocyanate-reactive sulfur-containing compound selected from disulfides and sulfur-containing aromatic diamines and
2,3-dibromoallyl alcohol.

2. A flame retardant composition as in claim 1 wherein
when the isocyanate-reactive sulfur-containing compound is a sulfur-containing aromatic diamine, the sulfur-containing aromatic diamine is in the range of about 10 wt % to about 45 wt %, and 2,3-dibromoallyl alcohol is in the range of about 50 wt % to about 80 wt %;
when the isocyanate-reactive sulfur-containing compound is a disulfide,
the disulfide is in the range of about 10 wt % to about 55 wt %, and 2,3-dibromoallyl alcohol is in the range of about 45 wt % to about 90 wt %;

wherein the wt % are based on the total weight of the flame retardant composition.

3. A flame retardant composition as in claim 1 wherein the isocyanate-reactive sulfur-containing compound is bis(2-hydroxyethyl)disulfide.

4. A formulation comprising
at least one polyol,
at least one blowing agent,
at least one catalyst,
at least one surfactant,
at least one isocyanate-reactive sulfur-containing compound selected from disulfides and sulfur-containing aromatic diamines, and
2,3-dibromoallyl alcohol.

5. A formulation as in claim 4 wherein the polyol is a polyether polyol and/or a polyester polyol.

6. A formulation as in claim 4 wherein the polyol has a functionality of about 3 to about 7.

7. A formulation as in claim 4 wherein the blowing agent is water, 1,1,1,3,3-pentafluoropropane, trans-1-chloro-3,3,3-trifluoropropene, and/or 1,2-bis(trifluoromethyl)ethene.

8. A formulation as in claim 4 wherein the sulfur-containing aromatic diamine is a mixture of 3,5-dimethylthio-toluene-2,4-diamine and 3,5-dimethylthio-toluene-2,6-diamine, and/or the disulfide is bis(2-hydroxyethyl)disulfide.

9. A rigid polyurethane foam formed from components comprising a polyisocyanate and a formulation as in claim 4 .

10. A process for forming a rigid polyurethane foam, which process comprises
contacting
A) a polyisocyanate, and
B) a formulation formed from
at least one polyol,
at least one blowing agent,
at least one catalyst,
at least one surfactant,
at least one isocyanate-reactive sulfur-containing compound selected from disulfides and sulfur-containing aromatic diamines, and
2,3-dibromoallyl alcohol, and

allowing the mixture to cure to form a rigid polyurethane foam.

11. A process as in claim 10 wherein A) and B) are in amounts such that the Isocyanate Index of the mixture is about 85 to about 1000, and wherein a rigid polyurethane foam is formed.

12. A rigid polyurethane foam formed as in claim 10 .

Assignees

• Albemarle Corp

Inventors

• Tang Yong
• Ibay Augusto Caesar

Classifications

• C08G18/4211 Primary

  derived from aromatic dicarboxylic acids and dialcohols · CPC title

• C08G18/282

  Alkanols, cycloalkanols or arylalkanols including terpenealcohols · CPC title

• C08G18/381 Primary

  having bromine atoms · CPC title

• C08G18/3857

  having nitrogen in addition to sulfur · CPC title

• C08G18/3868

  the sulfur atom belonging to a sulfide group · CPC title