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US 4,216,261 AGranted
Semi-durable, water repellant, fire resistant intumescent process
AssigneeThe United States of America as represented by the Secretary of the Army
InventorGil M. Dias
Life of this patent
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Abstract
A process for imparting an intumescent, water repellent, fire retardant fsh to fabrics comprising applying to the fabric an aqueous dispersion and drying same.
Claims8
A process for imparting an intumescent, water repellent, fire retardant finish to fabrics, which comprises applying to the fabric an aqueous dispersion of:
- a. 5.9-20 percent by weight of a substantially water insoluble ammonium polyphosphate catalyst,
- b. 2.6-10 percent by weight of a carbonific,
- c. 2-6 percent by weight of a blowing agent selected from the group consisting of dicyanidiamide, urea, melamine or guanidine,
- d. 10-20 percent by weight of an emulsion containing a chlorinated paraffin, a lower temperature blowing agent,
- e. 2-12 percent by weight of viscous, water insoluble liquid solution containing 10 percent by weight of a water repellent selected from the group consisting of lead stearate, aluminum acetate, aluminum silicate and hydrocarbon waxes, 10 percent by weight of a fire-retardant selected from the group consisting of zinc borate, antimony oxide, stannic oxide and zinc oxide, 50 percent by weight of a binder, and 30 percent by weight of a solvent vehicle, and
- f. 32-75.5 percent by weight of water;
- and then drying said dispersion on said fabric.
4 more elements
Dependencies are inferred from the claim text.