Patent ID: 8124665
Filing Date: 2012-02-28
Classification: C04B,C08G,C08K,C08L

Abstract:
1. A fire-resistant, flexible, molded, medium density polyurethane foam comprising: a) 10 to 30 parts by weight of at least one polyester polyol having a functionality of from 1.5 to 3.0 and an OH number of from 25 to 250, and which comprises the reaction product of b) 5 to 15 parts by weight of at least one highly branched polyether polyol having a functionality of 3.0 to 8.0 and an OH number of 250 to 750 c) 5 to 15 parts by weight of at least one chain extender having a functionality of from 2.0 to 2.9 and an OH number of from 400 to 1900; d) 30 to 55 parts by weight of a polymethylene poly(phenyl isocyanate), an isocyanate group containing prepolymer based on a polymethylene poly(phenyl isocyanate), or mixtures thereof, with said isocyanate component having an NCO group content of from 25 to 33% by weight; e) 10 to 35 parts by weight of solid flame retardant; and f) a sufficient quantity of water to provide blowing to achieve a free rise density from 8 to 20 pcf in the resultant polyurethane foam, with the sum of the parts by weight of components a), b), c), d) and e) totaling 100 parts by weight.