Polyester Polyurethane Foam Containing Fumed Silica
The invention relates to a polyester polyurethane foam obtained by reacting an organic polyisocyanate with a liquid polyol having a melting point lower than 25° C. in the presence of a halogen-free organophosphorus flame retardant and a foam stabilizer, characterized in that the stabilizer is fumed silica in an amount of 0.1 to 5 wt. % of the composition.
1 . A polyester polyurethane foam obtained by reacting an organic polyisocyanate with a liquid polyol having a melting point lower than 25° C. in the presence of a halogen-free organophosphorus flame retardant and a foam stabilizer, wherein the stabilizer is fumed silica in an amount of 0.1 to 5 wt. % of the composition.
2 . The polyester polyurethane foam of claim 1 wherein the flame retardant is Fyrol® PNX.
3 . The polyester polyurethane foam of claim 1 wherein the amount of flame retardant is 1 to 10 wt. % of the composition, and preferably 4 to 6 wt. % of the composition.
4 . The polyester polyurethane foam of claim 1 wherein the amount of fumed silica is 0.3 to 1 wt. % of the composition.
5 . The polyester polyurethane foam of claim 1 wherein the foam has a density less than 35 kg/m3.
6 . Use of fumed silica as a foam stabilizer for a polyester polyurethane foam obtained by reaction an organic polyisocyanate with a liquid polyol having a melting point lower than 25° C. comprising a halogen-free organophosphorus flame retardant.
7 . The polyester polyurethane foam of claim 2 wherein the amount of flame retardant is 1 to 10 wt. % of the composition, and preferably 4 to 6 wt. % of the composition.
8 . The polyester polyurethane foam of claim 2 wherein the amount of fumed silica is 0.3 to 1 wt. % of the composition.
9 . The polyester polyurethane foam of claim 3 wherein the amount of fumed silica is 0.3 to 1 wt. % of the composition.
10 . The polyester polyurethane foam of claim 4 wherein the amount of fumed silica is 0.3 to 1 wt. % of the composition
11 . The polyester polyurethane foam of claim 7 wherein the amount of fumed silica is 0.3 to 1 wt. % of the composition
12 . The polyester polyurethane foam of claim 2 wherein the foam has a density less than 35 kg/m3.
13 . The polyester polyurethane foam of claim 3 wherein the foam has a density less than 35 kg/m3.
14 . The polyester polyurethane foam of claim 7 wherein the foam has a density less than 35 kg/m3.
14 . The polyester polyurethane foam of claim 4 wherein the foam has a density less than 35 kg/m3.
15 . The polyester polyurethane foam of claim 8 wherein the foam has a density less than 35 kg/m3.
16 . The polyester polyurethane foam of claim 9 wherein the foam has a density less than 35 kg/m3.
17 . The polyester polyurethane foam of claim 10 wherein the foam has a density less than 35 kg/m3.