# US 8,785,696 B2 · Phosphorus compound and method for preparing the same

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- Number: US 8,785,696 B2
- Document ID: US8785696B2
- Status: Granted
- Kind: B2
- Application number: 12/611,591
- Filed: 2009-11-03
- Published: 2010-05-20
- Granted: 2014-07-22
- Earliest claimed: 2008-11-14
- Assignees: ChangChun Plastics Co., Ltd.
- Applicants: I-Cheng Hsu; Ping-Chieh Wang; An-Pang Tu; Kuen-Yuan Hwang
- Inventors: I-Cheng Hsu; Ping-Chieh Wang; An-Pang Tu; Kuen-Yuan Hwang
- Web page: https://patentgrep.com/patent/US8785696B2

## CPC

- C07F 9/657172: {the ring phosphorus atom and one oxygen atom being part of a (thio)phosphinic acid ester: [IMAGE cpc-sch-C07F-1008.gif] (X = O, S)}
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

The present invention provides a phosphorus compound of formula (I). The phosphorus compound is prepared by reacting a compound of formula (II) with alkylene carbonate. As compared with the conventional phosphorus compounds as flame-resistant additives, the phosphorus compound of the present invention has not only a high pyrolysis temperature but also excellent solubility in most of the organic solvents with high or low polarity, and is therefore a suitable flame-resistant additive for use in thermosetting or thermoplastic resins.

## Claims

### Claim 1

A phosphorus compound of formula (I):
wherein R is a trivalent alkane group having 1 to 6 carbon atoms, and Ar is phenylene or naphthalene, and m and n are independently an integer of 1 to 5.

### Claim 2 (depends on 1)

The compound of claim 1, wherein the trivalent alkane group is selected from the group consisting of methanetriyl, ethanetriyl, propanetriyl, hexanetriyl and cyclohexanetriyl.

### Claim 3

A method for preparing the phosphorus compound having a structure represented by formula (I),
wherein R is a trivalent alkane group having 1 to 6 carbon atoms, and Ar is phenylene or naphthalene, and m and n are independently an integer of 1 to 5;
the method comprising the steps of:
reacting a compound of formula (II) with alkylene carbonate or alkylene oxide in a solvent under heating,
drying to remove the solvent and recover a product.

### Claim 4 (depends on 3)

The method of claim 3, wherein the alkylene carbonate is unsubstituted or substituted with alkyl having 1 to 6 carbon atoms, haloalkyl having 1 to 6 carbon atoms or halogen.

### Claim 5 (depends on 3)

The method of claim 3, wherein the alkylene carbonate is selected from the group consisting of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, chloroethylene carbonate, 5,5-diethyl-1,3-dioxolan-2-one and 5-methyl-5-propyl-1,3-dioxolan-2-one.

### Claim 6 (depends on 3)

The method of claim 3, wherein the alkylene oxide is ethylene oxide.