# US 10,500,756 B2 · Methods of conferring fire retardancy to wood and fire-retardant wood products

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- Number: US 10,500,756 B2
- Document ID: US10500756B2
- Status: Granted
- Kind: B2
- Application number: 15/314,791
- Filed: 2015-05-27
- Published: 2017-05-04
- Granted: 2019-12-10
- Earliest claimed: 2014-06-04
- Assignees: Koppers Performance Chemicals Inc.
- Applicants: Koppers Performance Chemicals Inc.
- Inventors: Jun Zhang; John Horton; Xinhao H. Gao
- Web page: https://patentgrep.com/patent/US10500756B2

## CPC

- B27K 3/163: {Compounds of boron}
- B05D 1/02: performed by spraying
- B05D 1/18: performed by dipping
- B05D 1/28: performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
- B05D 3/0493: {using vacuum}
- B05D 5/00: Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D 7/06: to wood
- B05D 7/50: {Multilayers}
- B27K 3/08: Impregnating by pressure {, e.g. vacuum impregnation}
- B27K 3/166: {Compounds of phosphorus}
- B27K 3/36: Aliphatic compounds
- B27K 5/003: {by using electromagnetic radiation or mechanical waves (infrared heating of wood B27K5/001)}
- B27K 5/0055: {Radio-waves, e.g. microwaves}
- C09D 5/185: {Intumescent paints}
- C09K 21/02: Inorganic materials
- C09K 21/04: containing phosphorus
- C09K 21/10: containing nitrogen
- B05D 7/08: using synthetic lacquers or varnishes
- B05D 2203/20: Wood or similar material
- B05D 2401/20: Aqueous dispersion or solution
- B05D 2502/00: Acrylic polymers
- B05D 2503/00: Polyurethanes
- B05D 2504/00: Epoxy polymers
- B05D 2505/00: Polyamides
- B05D 2508/00: Polyesters
- B27K 2200/15: Pretreated particles or fibres
- B27K 2200/30: Multilayer articles comprising wood
- B27K 2240/30: Fireproofing
- Y10T 428/266: of base or substrate
- B27K: PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR (applying liquids or other fluent materials to surfaces in general B05; coating wood or similar material B44D); CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A process is provided for treating wood products including lumber, plywood and other engineered wood products comprising the steps of applying an aqueous fire-retardant impregnate and applying a coating to the surface of the wood product. In one embodiment, said process confers fire-retardant properties to the wood products sufficient to pass the extended burn test of ASTM E-84. The present invention also provides fire retardant wood products.

## Claims

### Claim 1

A method of treating an engineered wood product comprising the steps of:
applying an aqueous fire-retardant impregnate by pressure or vacuum treatment or microwave treatment to an engineered wood product with a thickness of approximately ½ inch in an amount of about 1 to about 4.5 pcf, such that the impregnate penetrates the engineered wood product; and
applying a coating to the engineered wood product surface in an amount of about 0.04 to about 0.11 lbs/ft2;
wherein said coating is an intumescent coating comprising a polymer binder, a source of mineral acid catalyst, a source of carbon, and a source of non-flammable gas; and
wherein said polymer binder is selected from the group consisting of a dispersion of a thermoplastic polymer, a thermosetting polymeric resin, a film forming polymeric resin, an aqueous dispersion of polyamide resins, polyethylene resins, polypropylene resins, polyester resins, polyester resins, vinyl ester resins, vinyl ester ethylene copolymers, acrylic resins, styrene/acrylic copolymers, styrene/butadiene copolymers, synthetic or natural latexes, epoxies and polyurethanes.

### Claim 2 (depends on 1)

The method of claim 1, wherein said coating may incorporate fibrous reinforcements, threads, yarns, and fabrics of both natural and synthetic materials and combinations thereof.

### Claim 3 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are synthetic fibers.

### Claim 4 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are glass.

### Claim 5 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are polyamide.

### Claim 6 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are graphite.

### Claim 7 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are natural fibers.

### Claim 8 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are hemp.

### Claim 9 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are jute.

### Claim 10 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are sisal.

### Claim 11 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are cotton.

### Claim 12 (depends on 2)

The method of claim 2, wherein said fibrous reinforcements are wool.