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1. US20150299373 - METHOD FOR PRODUCING SOFT POLYURETHANE FOAM BASED ON POLYESTER POLYOLS

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Claims

1.- 13. (canceled)
14. A process for the production of polyester-polyol-based flexible polyurethane foams comprising reacting component A comprising
A1 100 parts by weight of at least one polyester polyol having a hydroxyl number of from 40 mg KOH/g to 85 mg KOH/g, an acid number of less than 5 mg KOH/g and an ester group concentration of less than 9.80 mol/kg, wherein the polyester polyol is obtained by reaction of
A1.1 at least two dicarboxylic acids and
A1.2 at least one di- and/or poly-hydric aliphatic alcohol,
A2 from 0.5 to 25 parts by weight (based on the parts by weight of component A1) of water and/or physical blowing agents,
A3 from 0.05 to 10 parts by weight (based on the parts by weight of component A1) of auxiliary substances and additives such as
a) catalysts,
b) surface-active additives,
c) pigments or flame retardants,
A4 from 0 to 10 parts by weight (based on the parts by weight of component A1) of compounds containing isocyanate-reactive hydrogen atoms and having a molecular weight of from 62 to 399,
with component B comprising di- and/or poly-isocyanates,
wherein the production takes place at an index of from 50 to 250, and
wherein all the parts by weight of components A2 to A4 specified in the present application are based on 100 parts by weight of component A1.
15. The process according to claim 14, wherein component A1 comprises at least 95 wt. % of an aliphatic polyester.
16. The process according to claim 14, wherein component A1.1 are at least two compounds selected from the group consisting of succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid and/or sebacic acid.
17. The process according to claim 14, wherein component A1.2 is, to the extent of at least 90 wt. %, selected from the group consisting of ethylene glycol, diethylene glycol and/or trimethylolpropane.
18. The process according to claim 14, wherein at least one of components A1.1 and/or A1.2 is prepared by a fermentative process and/or is of biological origin.
19. The process according to claim 14, wherein component A1.1 is fermentatively prepared succinic acid and/or bio-based sebacic acid and/or bio-based azelaic acid.
20. The process according to claim 14, wherein the production takes place at an index of from 75 to 115.
21. The process according to claim 14, wherein component B is at least one compound selected from the group consisting of 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, 2,2′-diphenylmethane diisocyanate and polyphenylpolymethylene polyisocyanate.
22. A flexible polyurethane foam obtained by the process according to claim 14.
23. A process for the preparation of polyester polyol A1 having a hydroxyl number of from 40 mg KOH/g to 85 mg KOH/g, an acid number of less than 5 mg KOH/g and an ester group concentration of less than 9.80 mol/kg, wherein the polyester polyol is obtained by reaction of
A1.1 at least two dicarboxylic acids and
A1.2 at least one di- and/or poly-hydric aliphatic alcohol,
and wherein the polyester polyol is an aliphatic polyester to the extent of at least 95 wt. %.
24. The polyester polyol A1 obtained by the process according to claim 23.
25. A method comprising utilizing the polyester polyols A1 according to claim 24 in the production of flexible polyurethane foams.
26. A method comprising utilizing the flexible polyurethane foams according to claim 22 in the production of furniture upholstery, a mattress, a motor vehicle seat, a headrest, an armrest, a sponge, a textile inlay or a structural element.