Blends of polyurethane and polyphosphazene and their use as flam

Details Blends of polyurethane and polyphosphazene and their use as flam Blends of polyurethane and polyphosphazene and their use as flam

1997-05-07

1999-10-12

Woodward, Ana

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

Synthetic resins

Cellular products or processes of preparing a cellular...

525453, C08L 7500

Patent

active

059656271

ABSTRACT:
Flame-retardant polymer blends of a polyurethane polymer or prepolymer and a poly(organophosphazene) are disclosed. Preferred poly(organophosphazenes) contain functional groups capable of reacting with isocyanate groups present during the curing of the polyurethane. The blends are preferably formulated by reacting the poly(organophosphazene) containing functional groups under conditions where some of the functional groups of the poly(organophosphazene) can react with the isocyanate groups present during the polymerization and curing of the polyurethane. These polymer blends are useful for making flame-retardant foamed articles of manufacture.

REFERENCES:
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C.S. Reed, et al., "Thermal Stability and Compressive Strength of Calcium-Deficient Hydroxyapatite-Poly[bis(carboxylatophenoxy)phosphazene] Composites", Chemistry of Materials, 1996, 8, 440-447.

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