Fire protected foamed polymeric materials
AssigneeFirestop Chemical Corporation
InventorFelix Dimanshteyn
Life of this patent
Estimating the term…
Abstract
Disclosed are foam polymer compositions having outstanding resistance to expose to flame. The compositions comprise the product of reaction of a foamable composition and certain inorganic filler materials including one or more of (A) microexplodable micron-sized particles having an internal phase of a non-flammable gas releasing inorganic particulate material such as alumina trihydrate and an external phase of fusible inorganic material such as sodium silicate, (B) particulate, expandable alkali metal silicate, and (C) a particulate inorganic fire retardant such as ammonium salt of a phosphate or polyphosphate. The foams are self-extinguishing, essentially non dripping, and generate only low levels of smoke when impacted directly with the flame of a blowtorch.
Claims19
A fire protected foamed polymeric material comprising the product of reaction of a mixture of
- I a foamable polymer composition,
- II fire resistant inorganic particles, said particles comprising a member selected from the group consisting of:
- (A) inorganic particulate material which, when heated to a preselected temperature above the temperature at which said foamable polymer composition is foamed, endothermically releases a nonflammable gas,
- (B) the particulate material of part A enveloped by a solid, fracturable, inorganic external phase having a fusion point above said preselected temperature, to produce particles comprising at least two phases, said two-phase particulate material, upon exposure to sufficient heat, being microexplodable to release said nonflammable gas, and operable subsequently to form a nonflammable vitreous barrier, and
- (C) mixtures of materials A and B;
- and
- III particulate, expandable alkali metal silicate,
- said foamed polymeric material being self fire extinguishing, substantially non-dripping, and forming a vitreous surface barrier layer when directly exposed to flame.
A fire protective filler composition for dispersion within a solid polymer phase to impart fire protection thereto, said filler comprising a non aqueous mixture of:
- a component selected from the group consisting of:
- (A) inorganic particulate material which, upon exposure to fire temperatures, endothermically releases a nonflammable gas;
- (B) inorganic particulate material which, upon exposure to fire temperatures, endothermically releases a nonflammable gas enveloped by a solid, fracturable, inorganic external phase having a fusion point above the temperature at which said nonflammable gas is released, and
- (C) mixtures of components A and B,
- II particulate, expandable, alkali metal silicate, and
- III inorganic fire retardant material selected from the group consisting of an ammonium salt of phosphate, pyrophosphate, polyphosphate, sulfate, and mixtures thereof.
Dependencies are inferred from the claim text.