Low resilience flexible polyurethane foam and process for its production

A process for producing a flexible polyurethane foam, which comprises reacting a polyol mixture with a polyisocyanate compound in the presence of a urethane-forming catalyst, a blowing agent and a foam stabilizer, characterized in that the polyol mixture comprises polyol (A), polyol (B) and monool (D), and the proportion of the polyisocyanate compound to all active hydrogen-containing compounds in the mixture is at least 90 by isocyanate index, wherein:

• Polyol (A) is a bifunctional polyoxypropylene polyol having a hydroxyl value of from 10 to 60 mgKOH/g, obtained by ring-opening addition polymerization of an alkylene oxide to an initiator using a double metal cyanide complex catalyst;
• Polyol (B) is a polyoxypropylene polyol having a hydroxyl value of from 100 to 250 mgKOH/g;
• Monool (D) is a polyoxypropylene monool having a hydroxyl value of from 10 to 200 mgKOH/g;
• the proportion of the total of the polyol (A) and the polyol (B) is at least 75 mass % based on 100 mass % of the polyol mixture;
• the proportion of the monool (D) is from 1 to 30 parts by mass per 100 parts by mass of the total of the polyol (A) and the polyol (B);
• the flexible polyurethane foam does not comprise plasticizer;
• and
• the flexible polyurethane foam has a rebound resilience of the core of at most 15% and an air permeability of from 30 to 100 L/min.