METHOD FOR PRODUCING FLEXIBLE POLYURETHANE FOAM MATERIALS

1 - 15 . (canceled)

16 . A method for producing a flexible polyurethane foam comprising reacting component A comprising

A1 100 parts by weight of polyether polyol,

A2 0.5 to 25 parts by weight (based on 100 parts by weight of component A1) water and/or a physical blowing agent, and

A3 0.05 to 10 parts by weight (based on 100 parts by weight of component A1) auxiliary substance and/or additive

a) a catalyst,

b) a surface-active additive,

c) a pigment or flame retardant,

with an NCO-terminated, urethane group-comprising prepolymer (component B) comprising one or more polyisocyanate (B1) and one or more polyether carbonate polyol (B2),

the production taking place at an index of 50 to 250.

17 . A method for producing a flexible polyurethane foam, comprising

(i) in a first step, adding one or more alkylene oxide and carbon dioxide to one or more H-functional starter substance in the presence of at least one DMC catalyst,

(ii) in a second step, reacting one or more polyisocyanate (B1) with the polyether carbonate polyol (B2) formed in step (i) to form an NCO-terminated, urethane group-comprising prepolymer (B), and

(iii) in a third step, producing a flexible polyurethane foam by reacting component A (polyol formulation) comprising

A1 100 parts by weight polyether polyol,

A2 0.5 to 25 parts by weight (based on 100 parts by weight of component A1) water and/or a physical blowing agent, and

A3 0.05 to 10 parts by weight (based on 100 parts by weight of component A1) auxiliary substance and/or additive

a) a catalyst,

b) a surface-active additive,

c) a pigment or flame retardant,

with component B resulting from step (ii),

wherein the production of the flexible polyurethane foam takes place at an index of 50 to 250.

18 . The method according to claim 16 , wherein component A is free from polyether carbonate polyols.

19 . The method according to claim 16 , wherein component A additionally comprises

A4 0 to 10 parts by weight (based on 100 parts by weight of component A1) isocyanate-reactive compound comprising a hydrogen atom with a molecular weight of 62-399.

20 . The method according to claim 16 , wherein one or more alkylene oxide addition product of starter compound with Zerewitinoff-active hydrogen atom is used as polyether polyol A1.

21 . The method according to claim 16 , wherein the polyether polyol A1 comprises one or more alkylene oxide addition product, obtained by reaction of at least one starter compound selected from the group consisting of propylene glycol, ethylene glycol, diethylene glycol, dipropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, hexanediol, pentanediol, 3-methyl-1,5-pentanediol, 1,12-dodecanediol, glycerol, trimethylolpropane, triethanolamine, pentaerythritol, sorbitol, sucrose, hydroquinone, pyrocatechol, resorcinol, bisphenol F, bisphenol A, 1,3,5-trihydroxybenzene and methylol group-comprising condensates of formaldehyde and phenol, methylol group-comprising condensates of formaldehyde melamine, methylol group-comprising condensates of formaldehyde, and urea, with

at least one alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, and styrene oxide.

22 . The method according to claim 16 , wherein component B1 comprises 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 polyphenyl polymethylene polyisocyanate.

23 . The method according to claim 16 , wherein the NCO-terminated, urethane group-comprising prepolymer (B) is obtained by reacting

B1) a polyisocyanate consisting of at least one component selected from the group consisting of 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, 2,2′-diphenylmethane diisocyanate, and polyphenyl polymethylene polyisocyanate with

B2) one or more polyether carbonate polyol.

24 . The method according to claim 16 , wherein the polyether carbonate polyol (B2) has an OH functionality of 2 to 6.

25 . The method according to claim 16 , wherein the polyether carbonate polyol (B2) is obtained by adding one or more alkylene oxide and carbon dioxide to one or more H-functional starter substance in the presence of at least one DMC catalyst.

26 . The method according to claim 16 , wherein the flexible polyurethane foam is produced as moulded foam in a cold foaming process.

27 . A flexible polyurethane foam with a density according to DIN EN ISO 3386-1-98 in the range of ≧10 kg/m 3 to ≦300 kg/m 3 and a compressive strength according to DIN EN ISO 3386-1-98 in the range of ≧0.5 kPa to ≦20 kPa (at 40% deformation and 4th cycle) obtained by a method according to claim 16 .