High tear strength flexible urethane foam composition and...

C - Chemistry – Metallurgy – 08 – G

Patent

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403/13, 403/14

C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08G 18/76 (2006.01)

Patent

CA 1231200

ABSTRACT OF THE DISCLOSURE A flexible polyurethane foam composition characterized by high tensile or tear strength is prepared by reacting an MDI prepolymer, prepared by reacting a MDI having a low functionality with an ethylene oxide-capped polypropylene glycol polyol, with a small amount of a tetraethylene glycol as a cross-linking agent and an ethylene oxide-capped polypropylene glycol polyol, the reaction carried out in the presence of a blowing amount of a blowing agent, such as water or a halocarbon, and a catalytic amount of a polyurethane catalyst, such as a combination of an amine and tetravalent tin catalyst. The addition of a small amount of a chlorinated phosphate flame-retardant agent mixed with the reaction provides for a polyurethane foam composition of good fire retardancy and which when exposed to open flame does not melt, but chars. Further, the addition of a trimerization catalyst provides a foam composition with reduced shrinkage.

486174

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