Polyester-polyol compositions for polyurethane foam with improved hydrolytic stability
The invention relates to compositions of glycidyl ester used as a stabilizer in polyurethane foams formulations having a good resistance to hydrolysis, improved damping with equivalent or improved physical properties, and high sound absorption capacity. The mono or poly-carboxylic acids glycidyl ester is used in amount of 0.1 to 10 weight % over the polyester polyol resin.
1. A composition of polyurethane foams, comprising:
an organic polyisocyanate; and
a blend comprising:
(a) a polyester polyol resin produced by a polycondensation reaction of an organic dicarboxylic acid or a derivative, and a polyol mixture; and
(b) a poly-carboxylic acid glycidyl ester in amount of 0.1 to 10 weight % over the polyester polyol resin.
2. The composition of claim 1 , wherein the poly-carboxylic acid glycidyl ester (b) is a poly-carboxylic glycidyl ester of an aliphatic poly acid with 18 to 36 carbon atoms or a cycloaliphatic poly acid with 5 to 15 carbon atoms.
3. The composition of claim 1 , wherein the poly-carboxylic acid glycidyl ester (b) is blended with the polyester polyol resin (a) at an end of the polycondensation reaction at a temperature above 120° C.
4. The composition of claim 1 , wherein the poly-carboxylic acid glycidyl ester (b) is blended with the polyester polyol resin (a) at a temperature below 120° C.
5. The composition of claim 1 , wherein the poly-carboxylic acid glycidyl ester (b) is present in a level of 0.2 to 8 weight % over the polyester polyol resin.
6. The composition of claim 1 , wherein the poly-carboxylic acid glycidyl ester (b) is present in a level of 0.3 to 5 weight % over the polyester polyol resin.
7. The composition of claim 1 , wherein the poly-carboxylic acid glycidyl ester (b) is present in a level of 0.5 to 1 weight % over the polyester polyol resin.
8. The composition of claims 1 , further comprising:
a catalyst for condensing the polyester polyol resin and the organic polyisocyanate: and
a blowing agent.
9. The composition of claim 1 , further comprising a chain extender, an additive, or both.
10. The composition of claim 1 , wherein the blend has an acid value below 2 mg KOH/g.
11. The composition of claim 1 , wherein the derivative is an anhydride.
12. A polyurethane foam composition, comprising:
an organic polyisocyanate; and
a mixture comprising:
a polyester polyol resin produced by a polycondensation reaction of:
an organic dicarboxylic acid or an anhydride; and
a polyol mixture; and
a poly-carboxylic acid glycidyl ester in an amount of 0.1 to 10 weight % over the polyester polyol resin.
13. The polyurethane foam composition of claim 12 , wherein the poly-carboxylic acid glycidyl ester is a poly-carboxylic acid glycidyl ester of an aliphatic poly acid with 18 to 36 carbon atoms.
14. The polyurethane foam composition of claim 12 , wherein the poly-carboxylic acid glycidyl ester is a poly-carboxylic acid glycidyl ester of a cycloaliphatic poly acid with 5 to 15 carbon atoms.
15. The polyurethane foam composition of claim 12 , wherein the poly-carboxylic acid glycidyl ester is mixed with the polyester polyol resin at an end of the polycondensation reaction at a temperature above 120° C.
16. A polyurethane foam composition, comprising:
an organic polyisocyanate; and
a mixture comprising:
a polyester polyol resin produced by reacting:
an anhydride; and
a polyol mixture; and
a poly-carboxylic acid glycidyl ester in an amount of 0.1 to 10 weight % over the polyester polyol resin.
17. The polyurethane foam composition of claim 16 , wherein the anhydride is a phthalic anhydride.
18. The polyurethane foam composition of claim 16 , wherein the mixture has an acid value below 1 mg KOH/g.
19. The polyurethane foam composition of claim 16 , wherein the poly-carboxylic acid glycidyl ester is a poly-carboxylic acid glycidyl ester of an aliphatic poly acid with 18 to 36 carbon atoms.
20. The polyurethane foam composition of claim 16 , wherein the poly-carboxylic acid glycidyl ester is a poly-carboxylic acid glycidyl ester of a cycloaliphatic poly acid with 5 to 15 carbon atoms.