# US 8,772,424 B2 · Curable phosphorus-containing flame retardant epoxy resin

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,772,424 B2
- Document ID: US8772424B2
- Status: Granted
- Kind: B2
- Application number: 13/286,806
- Filed: 2011-11-01
- Published: 2012-11-08
- Granted: 2014-07-08
- Earliest claimed: 2010-11-09
- Assignees: ICL-IP America Inc.
- Applicants: Sergei V. Levchik; Andrew Mieczyslaw Piotrowski; Joseph Zilberman; Stephen J. Chaterpaul
- Inventors: Sergei V. Levchik; Andrew Mieczyslaw Piotrowski; Joseph Zilberman; Stephen J. Chaterpaul
- Web page: https://patentgrep.com/patent/US8772424B2

## CPC

- C08G 59/066: {with chain extension or advancing agents}
- C08G 59/304: {containing phosphorus}
- C08G 59/3272: {containing phosphorus}
- Y10T 428/31511: Of epoxy ether
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This invention relates to an epoxy resin composition, in particular a curable phosphorus containing flame retardant epoxy resin composition comprising epoxy resin and an epoxy resin chain-extending amount of a diaryl alkylphosphonate and/or diaryl arylphosphonate and a cross-linking agent. The curable flame retardant compositions are useful in e.g., printed wiring boards or molding compounds for electronic applications, protective coatings, adhesives, as well as structural and decorative composite materials.

## Claims

### Claim 1

A process for preparing curable flame retardant epoxy resin composition comprising pre-reacting an epoxy resin chain-extending amount of at least one diaryl alkylphosphonate and/or diaryl arylphosphonate with an epoxy resin, in the presence of an effective amount of catalyst, optionally in a solvent, to provide linear epoxy oligomer.

### Claim 2 (depends on 1)

The process of claim 1 wherein the catalyst is selected from the group consisting of a quaternary phosphonium salt, a thermally stable tertiary amine having a boiling point higher than about 140° C., a quaternary ammonium salt, a thermally stable phosphine having a boiling point higher than 140° C., an imidazole compound and combinations thereof.

### Claim 3

A prereacted curable epoxy resin composition comprising a pre-reacted curable epoxy resin made by the process of pre-reacting an epoxy resin chain-extending amount of at least one diaryl alkylphosphonate and/or diaryl arylphosphonate with an epoxy resin, in the presence of an effective amount of catalyst to provide pre-reacted curable epoxy resin.

### Claim 4 (depends on 3)

The prereacted curable epoxy resin composition of claim 3 further comprising a crosslinking agent.

### Claim 5 (depends on 4)

The prereacted curable epoxy resin composition of claim 4 wherein the crosslinking agent is selected from the group consisting of an anhydride of carboxylic acid, amines, multiphenolic compounds and mixtures thereof.

### Claim 6 (depends on 4)

The prereacted curable epoxy resin composition of claim 4 wherein the cross-linking agent is present in an amount that ranges from about 3 to about 25 percent by weight of the total composition.

### Claim 7 (depends on 3)

A cured epoxy resin made by the process of curing the prereacted curable epoxy resin composition of claim 3.

### Claim 8 (depends on 7)

A coating comprising the cured epoxy resin of claim 7.

### Claim 9 (depends on 7)

A sealant comprising the cured epoxy resin of claim 7.

### Claim 10 (depends on 7)

A composite comprising the cured epoxy resin of claim 7.

### Claim 11 (depends on 7)

A laminate comprising the cured epoxy resin of claim 7.

### Claim 12 (depends on 7)

A molded item comprising the cured epoxy resin of claim 7.