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US 5,175,197 AGranted
Water-based intumescent fire barrier caulk
AssigneeMinnesota Mining and Manufacturing Company
InventorsRobert E. Gestner, Roger L. Langer
Life of this patent
Estimating the term…
Abstract
Water-based, intumescent, fire retardant material is made from, on a dry basis by weight, 100 parts of a latex such as polychloroprene latex and from 50 to 200 parts of water-insoluble intumescent mineral granules such as hydrated alkali metal silicate granules incorporating an oxy boron compound. This water-based intumescent material dries to an elastomeric state that has a Volume Expansion Factor (as defined) of at least two. It chars into a substantially rigid refractory thermal insulator to prevent fire from penetrating through voids into which the novel intumescent material has expanded.
Claims19
Water-based, intumescent fire retardant caulk material consisting essentially of
- (a) a latex consisting of a halogenated polymer and water, said water present in the caulk material in an amount ranging from about 30 to about 50 weight percent of the total latex weight;
- and
- (b) water-insoluble intumescent mineral granules consisting of a mixture of alkali metal silicate, represented by the formula M.sub.2 O:xSiO.sub.2 in which M is the alkali metal;
- at least one oxy boron compound selected from the group consisting of boric acid and borate salts of Group I and Group II elements;
- and water;
- in which the weight ratio of x ranges from about 1.5 to about 4, the molar ratio of boron to M is between about 0.2 and about 0.9, and the water is about 5 to about 15 weight percent of the total granule weight, and wherein the weight ratio of said halogenated polymer to said water-insoluble intumescent mineral granules ranges from about 1.4:1 to about 0.7:1,
- which material dries to an elastomeric state.
4 more elements
Method of enhancing the fire retardancy of a wall or floor comprising the steps of
- (1) preparing a water-based, intumescent, fire retardant caulk material by blending a latex consisting of a halogenated polymer and water, said water present in the caulk material in an amount ranging from about 30 to about 50 weight percent of the total latex weight, and water-insoluble intumescent mineral granules consisting of a mixture of alkali metal silicate, represented by the formula M.sub.2 O:xSiO.sub.2 in which M is the alkali metal;
- at least one oxy boron compound selected from the group consisting of boric acid and borate salts of Group I and Group II elements;
- and water;
- in which the weight ratio of x ranges from about 1.5 to about 4, the molar ratio of boron to M is between about 0.2 and about 0.9, and the water is about 5 to about 15 weight percent of the total granule weight, which expands and releases water upon the application of heat, wherein the weight ratio of said halogenated polymer to said water-insoluble intumescent mineral granules ranges from about 1.4:1 to about 0.7:1,
- (2) applying said material to openings through said wall or floor, and
- (3) allowing the applied material to dry to an elastomeric state.
3 more elements
Water-based, intumescent fire retardant caulk material consisting essentially of
- (a) a latex consisting of a non-halogenated polymer and water, said water present in the caulk material in an amount ranging from about 30 to about 50 weight percent of the total latex weight;
- (b) 5 to 200 parts (dry weight basis of caulk) fire retardant, and
- (c) water-insoluble intumescent mineral granules consisting of a mixture of alkali metal silicate, represented by the formula M.sub.2 O:xSiO.sub.2 in which M is the alkali metal;
- at least one oxy boron compound selected from the group consisting of boric acid and borate salts of Group I and Group II elements;
- and water;
- in which the weight ratio of x ranges from about 1.5 to about 4, the molar ratio of boron to M is between about 0.2 and about 0.9, and the water is about 5 to about 15 weight percent of the total granule weight, wherein the weight ratio of said non-halogenated polymer to said water-insoluble intumescent mineral granules ranges from about 2:1 to about 1:2,
- which material dries to an elastomeric state.
4 more elements
Method of enhancing the fire retardancy of a wall or floor comprising the steps of
- (1) preparing a water-based, intumescent, fire retardant caulk material by blending a latex consisting of a non-halogenated polymer and water, said water present in the caulk material in an amount ranging from about 30 to about 50 weight percent of the total latex weight, 5 to 200 parts (dry basis of caulk weight) fire retardant, and water-insoluble intumescent mineral granules consisting of a mixture of alkali metal silicate, represented by the formula M.sub.2 O:xSiO.sub.2 in which M is the alkali metal;
- at least one oxy boron compound selected from the group consisting of boric acid and borate salts of Group I and Group II elements;
- and water;
- in which the weight ratio of x ranges from about 1.5 to about 4, the molar ratio of boron to M is between about 0.2 and about 0.9, and the water is about 5 to about 15 weight percent of the total granule weight, which expands and releases water upon the application of heat, wherein the weight ratio (dry basis) of said non-halogenated polymer to said water-insoluble intumescent mineral granules ranges from about 2:1 to about 1:2;
- (2) applying said material to openings through said wall or floor, and
- (3) allowing the applied material to dry to an elastomeric state.
3 more elements
Dependencies are inferred from the claim text.