Patent ID: 9701804
Date: 2017-07-11
CPC Classifications: C08G,C08J

Claim:
1. A method for producing a flexible polyurethane foam with a bulk density according to DIN EN ISO 3386-1-98 in the range of ≧10 kg/m 3 ≦150 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, comprising reacting component A which is free from fatty acid derivatives comprising hydroxyl groups and which comprises A1 100 parts by weight of conventional polyether polyol, A2 2 to 5 parts by weight, based on 100 parts by weight of component A1, of water and/or physical blowing agents, A3 0.2 to 4 parts by weight, based on 100 parts by weight of component A1, of auxiliary substances and additives, A4 0.05 to 5 parts by weight, based on 100 parts by weight of component A1, of compounds having hydrogen atoms capable of reacting with isocyanates having a molecular weight of from 62 to 399, wherein the conventional polyether polyol of component A1 is an alkylene oxide addition product of a starter compound with Zerewitinoff active hydrogen atoms, with component B, which is obtained by reacting one or more polyisocyanate (B1) and one or more fatty acid derivatives comprising hydroxyl groups (B2), wherein the one or more fatty acid derivatives comprising hydroxyl groups (B2) is one or more polyricinoleic acid ester, wherein the one or more polyricinoleic acid ester is obtained by polycondensation of a monomeric ricinoleic acid and a mono- or polyhydric alcohol in the presence of at least one catalyst selected from the group consisting of sulfuric acid, p-toluenesulfonic acid, tin(II) salts, and titanium(IV) compounds, wherein the molar ratio of monomeric ricinoleic acid and the mono- or polyhydric alcohol is in a range of ≧3:1 to ≦10:1, and wherein reacting component A with component B takes place at an isocyanate index of 70 to 130.