# US 4,399,046 A · Flame-retardant building materials and method for making same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,399,046 A - Document ID: US4399046A - Status: Granted - Kind: A - Application number: 06/341,322 - Filed: 1982-01-21 - Granted: 1983-08-16 - Earliest claimed: 1981-02-23 - Assignees: Tatsuro Okamura; Yoshida Kogyo K. K. - Inventors: Tatsuro Okamura; Hideki Irifune - Web page: https://patentgrep.com/patent/US4399046A ## CPC - E04B 1/94: against fire ({fire protection of partitions E04B2/7403, E04B2/7409; supporting constructions for ceilings having the capability of expansion in case of fire E04B9/08}; fire-fighting A62C, {e.g. fire prevention or containment A62C2/00}; impregnation of wood or similar materials B27K; {fireproof paints C09D5/18; fireproofing materials C09K21/00; flame-resistant papers D21H5/0002; coverings or linings, e.g. for walls or ceilings, in general E04F13/00}; fireproof doors E06B5/16; {firebreak devices for pipes or the like passing through walls F16L5/04; protection of pipes by means of non-inflammable material F16L57/04}) - C04B 16/02: Cellulosic materials (cellulosic waste materials, e.g. sawdust, rice husks, C04B18/24) - D06M 11/45: Oxides or hydroxides of elements of Groups 3 or 13 of the Periodic Table; Aluminates - D06M 11/71: Salts of phosphoric acids - D06M 2101/06: cellulosic - D06M 2200/12: Hydrophobic properties - D06M 2200/30: Flame or heat resistance, fire retardancy properties - Y02W 30/91: Use of waste materials as fillers for mortars or concrete - Y10S 428/92: Fire or heat protection feature - Y10S 428/921: Fire or flameproofing - E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001}) - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS - Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract The building material of the invention, which is in a disintegrated fluffy form and suitable for shaping into a board for walls and ceilings or as a blow-on or blow-in insulating material having excellent performance as heat and sound insulation, comprises essentially a disintegrated organic fibrous material, e.g. disintegrated scrapped paper and gel-like aluminum hydroxide uniformly blended with the fibrous material together with a flame retardant agent which is preferably an inorganic phosphate such as sodium phosphate and disodium hydrogen phosphate and, optionally, with a waterproofing agent. The building material is prepared by first mixing the organic fibrous material with an aqueous solution of the phosphate and then with an aluminum hydroxide sludge obtained as a noxious industrial waste in aluminum-processing industries employing surface anodization followed by drying and disintegration. ## Claims ### Claim 1 A building material which comprises a disintegrated organic fibrous material and aluminum hydroxide in a gel-like form admixed with a flame retardant agent. ### Claim 2 (depends on 1) The building material as claimed in claim 1 wherein the disintegrated organic fibrous material is disintegrated scrapped paper. ### Claim 3 (depends on 1) The building material as claimed in claim 1 wherein the flame retardant agent is an inorganic phosphate. ### Claim 4 (depends on 1) The building material as claimed in claim 1 which further comprises a waterproofing agent. ### Claim 5 (depends on 1) The building material as claimed in claim 1 which further comprises an organic adhesive. ### Claim 6 (depends on 3) The building material as claimed in claim 3 wherein the inorganic phosphate is sodium phosphate or disodium hydrogenphosphate. ### Claim 7 (depends on 4) The building material as claimed in claim 4 wherein the waterproofing agent is a wax emulsion. ### Claim 8 (depends on 5) The building material as claimed in claim 5 wherein the organic adhesive is an aqueous emulsion of a copolymeric resin of ethylene and vinyl acetate. ### Claim 9 A method for the preparation of a building material which comprises the steps of (a) admixing and kneading a disintegrated organic fibrous material with an aqueous solution of a flame retardant agent to form a mixture in which the organic fibrous material contains the aqueous solution absorbed therein, (b) admixing and kneading the mixture with an aluminum hydroxide sludge in a gel-like form to form a blended material in which the aluminum hydroxide sludge is deposited on and adheres uniformly to the surface of the fibers of the organic fibrous material, (c) drying the blended material, and (d) disintegrating the dried material.