| abstract |
Open-celled, cold-formable polyurethane foams are made by reacting a specific crude MDI with a polyol component which includes hydroxyl polyethers having an OH number of from about 28 to about 600, a difunctional phthalic acid hydroxyl polyester having an OH number of from about 150 to about 440, glycerol, a blowing agent (water is preferred), a tertiary amine catalyst and optionally a silicone foam stabilizer. These foams generally have a density of from about 23 to about 30 kg/m3 and may be molded into articles having intricate shapes (e.g., roof for automobiles) using known cold-forming techniques. |