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US 4,104,073 AGranted
Fire retardant intumescent putty
AssigneeDainichi-Nippon Cables, Ltd.
InventorsYooichi Koide, Tamotsu Kaide, Michio Takada, Keiji Ichikawa
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AssigneeDainichi-Nippon Cables, Ltd.
InventorsYooichi Koide, Tamotsu Kaide, Michio Takada, Keiji Ichikawa
Estimating the term…
The herein-disclosed putty is for forming air-tight and smoke-tight seals under normal and fire exposure conditions, and bubbles up when heated with flame, producing a foamed carbonaceous layer having outstanding fire-retardancy. It is a mixture having a cone penetration value of 2-40 which includes (a) liquid or semi-solid organic material having a viscosity of 50-100,000 c.st. at 210.degree. F and (b) a phosphoric acid compound substituted with one or more nitrogen-containing groups. The putty may also contain (c) polyhydric alcohols and/or carbohydrates for increased fire retardancy, (d) blowing agents for increased insulating effect, (e) grease, for high temperature flow resistance, (f) heat resistant fiber, for reinforcement, (g) microballoons, for increased insulating effect and other additives. The enclosed drawing discloses particularly desirable proportions for the components (c) and (d) in relation to the amount of component (b).
A fire retardant intumescent putty having a cone penetration value of 2-40 (mm/150 g, 5 sec., at 20.degree. C) determined in accordance with JIS A 5752-1966, which comprises (a) at least 4% by weight of an organic material which is a semi-solid or liquid at room temperature and has a viscosity of 50-100,000 c.st. at 210.degree. F, (b) at least 13% by weight of a nitrogen-containing phosphate which contains at least 7% by weight of phosphorus and corresponds in structure to a phosphoric acid represented by the general formula, (xH.sub.2 O .multidot. yP.sub.2 O.sub.5)n, wherein 0 <
A method for sealing cavity to render it highly air-tight and smoke-tight under both normal and fire exposure conditions which comprises packing into said cavity a fire retardant intumescent putty having a cone penetration value of 2-40 (mm/150 g, 5 sec., at 20.degree. C) determined in accordance with JIS A 5752-1966, which comprises (a) at least 4% by weight of an organic material which is a semi-solid or liquid at room temperature and has a viscosity of 50-100,000 c.st. at 210.degree. F, (b) at least 13% by weight of a nitrogen-containing phosphate which contains at least 7% by weight of phosphorus and corresponds in structure to a phosphoric acid represented by the general formula, (xH.sub.2 O . yP.sub.2 O.sub.5)n, wherein 0 .multidot.(x/y) .ltoreq. 3 and n is 1-14, one or all of the hydrogen atoms of which are substituted with at least one mono-, di-, or tri-valent nitrogen-containing group consisting essentially of nitrogen and either or both of hydrogen and carbon, and (c) lubricating grease wherein said grease is in the form of a viscous paste or semi-solid at room temperature, has a cone penetration value of about 40-500 determined in accordance with JIS K 2560-1969, and comprises a thickener and a natural or synthetic oil which is non-volatile at room temperature.
Dependencies are inferred from the claim text.