Flame-retardant flexible polyurethane foam

Details Flame-retardant flexible polyurethane foam Flame-retardant flexible polyurethane foam

2006-05-30

2011-11-15

Cooney, John (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S107000, C521S170000

Reexamination Certificate

active

08058322

ABSTRACT:
A flexible polyurethane foam-forming composition and the flexible polyurethane foam obtained therefrom contain, as flame-retardant additive, a halogen-free phosphonate compound which is substantially unreactive for isocyanate, contains at least about 5 weight percent phosphorus, has an acid value of about 2 mg KOH/g or less, a volatility as measured by thermogravimetric analysis not exceeding a 5.0 percent weight loss at a temperature of about 150° C., and a weight average molecular weight of from about 200 to about 2000.

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patent: 2008/0275152 (2008-11-01), Hansel et al.
patent: 0316737 (1989-05-01), None
patent: 2319251 (1998-05-01), None

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