Stabilized polyurethane composition
The present invention provides a stabilising composition, comprising: a) a first phenolic antioxidant comprising one or more phenolic compounds having the structure of formula (I): wherein R 1 is a linear or branched alkyl group having from 12 to 20 carbon atoms; and b) one or more second phenolic antioxidants independently selected from: a mono-hydroxybenzene having lower steric hindrance than the first phenolic antioxidant; a di-hydroxybenzene; and/or a tri-hydroxybenzene.
1. A stabilized composition, comprising:
a) a polyurethane, or a polyurethane and a polyol; and
b) a stabilizing composition comprising:
i. a first phenolic antioxidant comprising two or more phenolic compounds having the structure of formula (I):
wherein R 1 is a linear or branched alkyl group having from 12 to 20 carbon atoms; and
ii) one or more second phenolic antioxidants independently selected from the group consisting of:
a mono-hydroxybenzene selected from the group consisting of α-tocopherol; 4,4′-thiobis(2-t-butyl-5-methylphenol), 2,2′-thiobis(6-t-butyl-4-methylphenol), 2,2′-methylenebis(6-t-butyl-4-methylphenol), 4,4′-butylidenebis[2-t-butyl-5-methylphenol], 2,2′-methylenebis(6-nonyl-p-cresol) and phenol, 4-methyl-, reaction products with dicyclopentadiene and isobutylene;
a di-hydroxybenzene selected from the group consisting of 4-tert-butylcatechol, 2,5-di-tert-amyl-hydroquinone, benzene-1,2-diol, benzene-1,3-diol, and benzene-1,4-diol, and
a tri-hydroxybenzene selected from the group consisting of benzene-1,2,3-triol, propyl 3,4,5-trihydroxybenzoate; and benzene-1,2,4-triol,
wherein the stabilizing composition does not contain a benzofuranone-based booster component.
2. The stabilized composition of claim 1 , wherein the stabilizing composition does not contain an amine-containing antioxidant.
3. The stabilized composition of claim 1 , wherein the polyol is present with the polyurethane and comprises a polyether polyol and/or a polyester polyol.
4. The stabilized composition of claim 1 , wherein the polyurethane comprises a polyurethane foam.
5. The stabilized composition of claim 1 , wherein the amount of stabilizing composition is present from about 0.01 to about 10%, by weight of the polyurethane or by weight of the polyurethane and the polyol.
6. The stabilized composition of claim 5 , wherein the amount of stabilizing composition is present from about 0.01 to about 5%, by weight of the polyurethane or by weight of the polyurethane and the polyol.
7. The stabilized composition of claim 5 , wherein the amount of stabilizing composition is present from about 0.01 to about 2%, by weight of the polyurethane or by weight of the polyurethane and the polyol.
8. The stabilized composition of claim 1 , wherein R1 is a linear or branched alkyl group having from 12 to 15 carbon atoms.
9. The stabilized composition of claim 1 , wherein R1 is a linear or branched alkyl group having from 13 to 15 carbon atoms.
10. The stabilized composition of claim 8 , wherein R1 is selected from the group consisting of a linear alkyl group having 12 carbon atoms, a branched alkyl group having 12 carbon atoms, a linear alkyl group having 13 carbon atoms, a branched alkyl group having 13 carbon atoms, a linear alkyl group having 14 carbon atoms, a branched alkyl group having 14 carbon atoms, a linear alkyl group having 15 carbon atoms, and a branched alkyl group having 15 carbon atoms.
11. The stabilized composition of claim 8 , wherein R1 is selected from the group consisting of a linear alkyl group having 13 carbon atoms, a branched alkyl group having 13 carbon atoms, a linear alkyl group having 14 carbon atoms, a branched alkyl group having 14 carbon atoms, a linear alkyl group having 15 carbon atoms, and a branched alkyl group having 15 carbon atoms.
12. The stabilized composition of claim 1 , wherein the first phenolic antioxidant comprises C13-C15 linear and branched alkyl esters of 3-(3′5′-di-t-butyl-4′-hydroxyphenyl) propionic acid.
13. The stabilized composition of claim 1 , wherein the first phenolic antioxidant is a liquid at ambient conditions.
14. The stabilized composition of claim 1 , wherein the one or more second phenolic antioxidants are selected from the group consisting of:
a di-hydroxybenzene selected from the group consisting of 4-tert-butylcatechol, 2,5-di-tert-amyl-hydroquinone, benzene-1,2-diol, and benzene-1,3-diol,
a tri-hydroxybenzene selected from the group consisting of benzene-1,2,3-triol; propyl 3,4,5-trihydroxybenzoate; and benzene-1,2,4-triol; and
a dimer or oligomer of mono-hydroxybenzene monomers selected from the group consisting of 4,4′-butylidenebis[2-t-butyl-5-methylphenol], and phenol, 4-methyl-, reaction products with dicyclopentadiene and isobutylene.
15. The stabilized composition of claim 1 , wherein the one or more second phenolic antioxidants are present in the stabilizing composition in an amount of from about 1 to about 50 wt. % based on the total weight of the stabilizing composition.
16. The stabilized composition of claim 15 , wherein the one or more second phenolic antioxidants are present in the stabilizing composition in an amount of from about 1 to about 35 wt. %, based on the total weight of the stabilizing composition.
17. The stabilized composition of claim 15 , wherein the one or more second phenolic antioxidants are present in the stabilizing composition in an amount of from about 5 to about 30 wt. %, based on the total weight of the stabilizing composition.
18. The stabilized composition of claim 15 , wherein the one or more second phenolic antioxidants are present in the stabilizing composition in an amount of from about 10 to about 25 wt. %, based on the total weight of the stabilizing composition.
19. The stabilized composition of claim 1 , wherein the stabilizing composition is a liquid at ambient conditions.