B2 rated one component spray polyurethane foam formulation for fenestration openings
OwnerSteven P. Crain, Lars Massueger +1inventors
InventorsSteven P. Crain, Lars Massueger, Carolin Boehm
Life of this patent
Estimating the term…
Abstract
A one component spray polyurethane foam formulation containing a polymeric isocyanate with nominal functionality of 2.5 to 3.5, a polyol component that is at least 85 percent aliphatic and having a mole ratio of polyol with three or more functionality to total polyol of 0.2 to 0.75, 15-30 wt % of a plasticizer, 1.5-3.5 wt % phosphorous, 5.5 to 11.5 halogen and 1.5 to 5 millimoles of blowing agent per gram of formulation and that is free of expandable graphite achieves a B2 rating in DIN 4102 testing.
Claims9
A one component spray flexible polyurethane foam formulation, said one component spray flexible polyurethane foam formulation characterized by comprising:
- (a) a polymeric isocyanate that has a nominal functionality in a range of 2.5 to 3.5 and present at a concentration sufficient to provide 10 to 20 weight-percent NCO functional groups base on the total weight of isocyanate and polyol in the formulation;
- (b) a polyol component that is at least 85 weight-percent aliphatic polyol based on total polyol component weight and that has a mole ratio of polyol having three or more hydroxyls per molecule to total moles of all polyol that is in a range of 0.2 to 0.60;
- (c) a plasticizer at a concentration in a range of 17 to 30 weight-percent based on total formulation weight;
- (d) a phosphorous concentration in a range of 1.5 to 3.5 weight-percent based on the weight of total formulation without blowing agent;
- (e) a halogen concentration in a range of 6.0 to 11.5 weight-percent based on the weight of total formulation without blowing agent;
- (f) a blowing agent at a concentration in a range of 1.5 to 5 millimoles per gram of formulation weight without blowing agent;
- where the foam formulation is further characterized by being free of expandable graphite and free of halogenated polyol;
- and the foam formulation is further characterized by expanding into a flexible foam having a density of 25-50 kg/m3.
Dependencies are inferred from the claim text.