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1. EP2912081 - METHOD FOR PRODUCING FLEXIBLE POLYURETHANE FOAMS BASED ON POLYESTER POLYOLS

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Claims

1. Process for production of polyester polyol-based flexible polyurethane foams by reaction of component A containing

A1 100 parts by weight of at least one polyester polyol having a hydroxyl number of 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 obtainable by reaction of

A1.1 at least two dicarboxylic acids and

A1.2 at least one di- and/or polyhydric aliphatic alcohol,

A2 0.5 to 25 parts by weight (based on the parts by weight of the component A1) of water and/or physical blowing agents,

A3 0.05 to 10 parts by weight (based on the parts by weight of the component A1) of auxiliary and additive substances such as

a) catalysts,

b) surface-active additives,

c) pigments or flame retardants,

A4 0 to 10 parts by weight (based on the parts by weight of the component A1) of compounds comprising isocyanate-reactive hydrogen atoms having a molecular weight of 62-399,

with component B containing di- and/or polyisocyanates,
wherein the production is carried out at an index of 50 to 250 and
wherein all reported parts by weight of the components A2 to A4 are in the present application based on 100 parts by weight of the component A1.
  2. Process according to Claim 1, characterized in that component A1 contains to an extent of at least 95% by weight an aliphatic polyester.
  3. Process according to either of Claims 1 or 2, characterized in that as component A1.1 contains at least two compounds from the group consisting of succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid and/or sebacic acid.
  4. Process according to Claim 1 to 3, characterized in that component A1.2 is selected to an extent of at least 90% by weight from the group consisting of ethylene glycol, diethylene glycol and/or trimethylolpropane.
  5. Process according to any of Claims 1 to 4, characterized in that at least one of the components A1.1 and/or A1.2 is produced by a fermentative process and/or has a biological origin.
  6. Process according to any of Claims 1 to 5, characterized in that as component A1.1 succinic acid produced by fermentative means and/or bio-based sebacic acid and/or bio-based azelaic acid is employed.
  7. Process according to any of Claims 1 to 6, wherein the production is carried out at an index of 75 to 115.
  8. Process according to any of Claims 1 to 7, wherein as component B at least one compound selected from the group consisting of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate and polyphenylpolymethylenepolyisocyanate is employed.
  9. Flexible polyurethane foams obtainable by a process according to any of Claims 1 to 8.
  10. Use of polyester polyols A1 having a hydroxyl number of 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 obtainable by reaction of

A1.1 at least two dicarboxylic acids and

A1.2 at least one di- and/or polyhydric aliphatic alcohol

and wherein the polyester polyol is to an extent of at least 95% by weight an aliphatic polyester,
for the production of flexible polyurethane foams.
  11. Use of flexible polyurethane foams according to Claim 9 for the production of furniture cushioning, mattresses, automobile seats, headrests, armrests, sponges, textile inserts and building elements.