# US 2014/0151597 A1 · Passivated aluminum nitride for enhanced thermal conductivity composite materials for fuser belts

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- Number: US 2014/0151597 A1
- Document ID: US20140151597A1
- Status: Published application
- Kind: A1
- Application number: 14/171,883
- Filed: 2014-02-04
- Published: 2014-06-05
- Earliest claimed: 2009-06-05
- Assignees: Xerox Corporation
- Applicants: Xerox Corporation
- Inventors: David J. Gervasi; Matthew M. Kelly; Santokh Badesha
- Web page: https://patentgrep.com/patent/US20140151597A1

## CPC

- G03G 15/2057: {relating to the chemical composition of the heat element and layers thereof}
- G03G 15/2064: {combined with pressure}
- G03G 2215/2025: the fixing nip having a rotating belt support member opposing a pressure member
- Y10T 428/256: Heavy metal or aluminum or compound thereof
- Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers
- Y10T 428/31721: Of polyimide
- Y10T 428/31855: Of addition polymer from unsaturated monomers
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In accordance with the present teachings, there are composite materials, fuser members comprising the composite materials, and methods of making the composite materials. In various embodiments, the composite material can include a polyimide resin having a thermal conductivity and a plurality of passivated aluminum nitride particles substantially uniformly dispersed in the polyimide resin to provide the composite material with a thermal conductivity of about 0.4 W/mK to about 2.5 W/mK, and wherein each of the plurality of passivated aluminum nitride particles can include a passivation layer disposed over an aluminum nitride particle core to inhibit oxidation and thermal degradation of a surface of the aluminum nitride particle core.

## Claims

### Claim 1

A composite material comprising:
a polyimide resin having a thermal conductivity; and
a plurality of passivated aluminum nitride particles substantially uniformly dispersed in the polyimide resin to provide the composite material with a thermal conductivity of about 0.4 W/mK to about 2.5 W/mK,
wherein each of the plurality of passivated aluminum nitride particles comprises a passivation layer disposed over an aluminum nitride particle core to inhibit oxidation and thermal degradation of a surface of the aluminum nitride particle core.

### Claim 2 (depends on 1)

The composite material of claim 1, wherein the passivation layer comprises condensation reaction products of monomers selected from the group consisting of 4,4′-oxydianiline, pyromellitic dianhydride, polyamic acid, BTDA (benzophenonetetracarboxylic acid), 1,4-benzenediamine, MPD (4,4′-methylenebisbenzeneamine), and BTDE (4,4′-carbonylbis(1,2-benzenedicarboxylic acid).

### Claim 3 (depends on 1)

The composite material of claim 1, wherein the plurality of passivated aluminum nitride particles comprises one or more of spherical particles and high aspect ratio particles.

### Claim 4 (depends on 1)

The composite material of claim 1, wherein the plurality of passivated aluminum nitride particles comprises particles having at least one dimension in the range of about 5 nm to about 5 μm.

### Claim 5 (depends on 1)

The composite material of claim 1, wherein the plurality of passivated aluminum nitride particles are present in an amount ranging from about 0.01 weight % to about 50 weight % of the total weight of the composite material.