Shaped PU foam articles

A shaped polyurethane foam article, wherein the shaped polyurethane foam article has been obtained by reaction of at least one polyol component and at least one isocyanate component in the presence of a compound (1a) and at least one compound of formula (1b) and at least one blowing agent,

• wherein formula (1b) is defined as follows:
• wherein in formula (1b):
• X represents nitrogen, amines of formula NR3R4, urea of formula N(R5)C(O)N(R6) or urea of formula N(R5)C(O)NR6R7,
• Y represents an amine group of formula NR8R9 or an ether group of formula OR9,
• R1 and R2 represent identical or different hydrocarbon radicals having 1 or 3 carbon atoms optionally bearing an OH group,
• R3 and R4 represent hydrogen or methyl,
• R5, R6 and R7 represent hydrogen, and
• R8 and R9 represent methyl,
• m=3,
• n=3,
• i=0 to 2,
• wherein at least one of the groups X, Y, OF R1, R2, R3, R4, R5, R6, and R7, bears a functionality which is reactive with a component which forms the polyurethane matrix,
• based on its starting volume the shaped polyurethane foam article is compressed by at least 30% and kept in compressed form by an auxiliary means for at least 20 hours said compound (1a) is N, N, N′-trimethyl-N′-(3-aminopropyl) bis (aminoethyl) ether and
• said shaped polyurethane foam article has a rebound resilience of 1 to <10%, measured in accordance with DIN EN ISO 8307:2008-03.