# US 7,611,771 B2 · Polyphosphate flame retardant

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- Number: US 7,611,771 B2
- Document ID: US7611771B2
- Status: Granted
- Kind: B2
- Application number: 11/661,162
- Filed: 2005-08-22
- Published: 2007-11-08
- Granted: 2009-11-03
- Earliest claimed: 2004-08-25
- Assignees: Kawashima Selkon Textiles Co., Ltd.
- Inventors: Kohei Ohara
- Web page: https://patentgrep.com/patent/US7611771B2

## CPC

- D06M 11/70: with oxides of phosphorus; with hypophosphorous, phosphorous or phosphoric acids or their salts
- C09K 21/04: containing phosphorus
- C09K 21/14: Macromolecular materials
- D06M 15/643: containing silicon in the main chain
- D06M 15/667: containing phosphorus in the main chain {(inorganic polyphosphates D06M11/72)}
- D06M 23/08: Processes in which the treating agent is applied in powder or granular form (adhesives for multi-layer textile fabrics D06M17/00)
- D06M 2200/30: Flame or heat resistance, fire retardancy properties
- Y10T 428/2995: Silane, siloxane or silicone coating
- Y10T 442/2672: Phosphorus containing
- D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The flame retardant according to the present invention is prepared by complexing a flame retardant polyphosphate compound with a silicone resin. The silicone resin is applied to cover the particles of the polyphosphate compound. As the polyphosphate compound, it is preferred to use ammonium polyphosphate having a weight average polymerisation degree of 20 to 2000. By applying the flame retardant of the present invention on fibers as a flame retardant resin composition containing a binder resin, environmentally soft flame retardant textile products can be stably obtained.

## Claims

### Claim 1

A polyphosphate flame retardant comprising complex particles of a polyphosphate compound having flame retardancy and a silicone resin, in which said polyphosphate compound includes particles having an average particle size of 3 to 50 μm, and said silicone resin is expressed by a general formula (RnSiO(4−n)/2)m where R is methyl, alky, fluoroalkyl, phenyl or vinyl, n=1 to 3, and m≧2, and said silicone resin is adhered around the particles of said polyphosphate compound.

### Claim 2 (depends on 1)

The polyphosphate flame retardant according to claim 1, in which the weight average polymerization degree of said polyphosphate compound is 20 to 2000.

### Claim 3 (depends on 1)

The polyphosphate flame retardant according to claim 1, in which said polyphosphate compound is ammonium polyphosphate.

### Claim 4 (depends on 1)

The polyphosphate flame retardant according to claim 1, in which said silicone resin comprises a combination of a monofunctional monomer unit and a tetrafunctional monomer unit and/or a trifunctional monomer unit.

### Claim 5

A flame retardant composition prepared by compounding a polyphosphate flame retardant comprising complex particles of a flame retardant polyphosphate compound and a silicone resin to a binder resin, in which said polyphosphate compound includes particles having an average particle size of 3 to 50 μm, and said silicone resin is expressed by a general formula (RnSiO(4−n)/2)m where R is methyl, alkyl, fluoroalkyl, phenyl or vinyl, n=1 to 3 and m≧2, and said silicone resin is fixed around the particles of the polyphosphate compound.

### Claim 6 (depends on 5)

The flame retardant resin composition according to claim 5, in which the weight average polymerization degree of said polyphosphate compound is 20 to 2000.

### Claim 7 (depends on 5)

The flame retardant resin composition according to claim 5, in which said polyphosphate compound is ammonium polyphosphate.

### Claim 8 (depends on 5)

The flame retardant resin composition according to claim 5, in which said binder resin is an acrylic resin.

### Claim 9

A flame retardant textile product prepared by a procedure in which a flame retardant resin composition prepared by compounding a polyphosphate flame retardant comprising complex particles of a flame retardant polyphosphate compound and a silicone resin in a binder resin is fixed on fibers, in which said polyphosphate compound includes particles having an average particle size of 3 to 50 μm, and said silicone resin is expressed by a general formula (RnSiO(4−n)/2)m where R is methyl, alkyl, fluoroalkyl, phenyl or vinyl, n=1 to 3 and m≧2, and said silicone resin is fixed around the particles of the polyphosphate compound.

### Claim 10 (depends on 9)

The flame retardant textile product according to claim 9, in which the weight average polymerization degree of said polyphosphate compound is 20 to 2000.

### Claim 11 (depends on 9)

The flame retardant textile product according to claim 9, in which said polyphosphate compound is ammonium polyphosphate.

### Claim 12 (depends on 9)

The flame retardant textile product according to claim 9, in which said binder resin is an acrylic resin.