# US 8,771,523 B1 · Polydisperse compositions and methods for eliminating volatile organic compounds

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- Number: US 8,771,523 B1
- Document ID: US8771523B1
- Status: Granted
- Kind: B1
- Application number: 13/752,634
- Filed: 2013-01-29
- Published: 2014-07-31
- Granted: 2014-07-08
- Earliest claimed: 2013-01-29
- Assignees: Xerox Corporation
- Applicants: Xeorx Corporation
- Inventors: Christopher Auguste Dirubio; William C. Dean; Jeffrey C. Shelton; Patricia A. Wang
- Web page: https://patentgrep.com/patent/US8771523B1

## CPC

- C08L 83/04: Polysiloxanes
- C08G 77/045: {containing less than 25 silicon atoms}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A composition that has a low volatile organic compound (VOC) content and methods for producing compositions having a low VOC content. The composition, such as a solid ink and/or toner release oil composition, may include less than about 0.15% by weight VOCs that have a sufficient vapor pressure at the operating temperature of printing device to enter the gas phase at the operating temperature of the printing device.

## Claims

### Claim 1

A method of preparing a polydisperse oil having a low content of volatile organic compounds (VOCs), the method comprising:
flowing polydisperse oil comprising VOCs over a surface to form a layer of polydisperse oil, and
forming a stripped polydisperse oil substantially free of VOCs having a molecular weight less than about 1500 g/mol by heating the layer of polydisperse oil at an effective temperature to remove VOCs having a molecular weight less than about 1500 g/mol.

### Claim 2 (depends on 1)

The method of claim 1, wherein the polydisperse oil has a number average molecular weight in the range of from about 800 g/mol to about 3500 g/mol, and a polydispersity index (Mw/Mn) in the range of from about 1.1 to about 2.2; and the layer of polydisperse oil is heated at an effective temperature to remove VOCs having a molecular weight less than about 550 g/mol to form a stripped polydisperse oil that includes less than about 0.15% by weight VOCs having a molecular weight less than about 550 g/mol.

### Claim 3 (depends on 2)

The method of claim 2, wherein the VOCs have a vapor pressure in the range of from about 0.01 mmHg to about 40 mmHg at 25° C.

### Claim 4 (depends on 2)

The method of claim 2, wherein the polydisperse oil has a viscosity in the range of from 10 cSt to about 40 cSt, and the viscosity of the stripped polydisperse oil is within about 2% of the viscosity of the polydisperse oil.

### Claim 5 (depends on 2)

The method of claim 2, wherein the polydisperse oil is a solid ink oil and the effective temperature is in the range of from about 40° C. to about 120° C.

### Claim 6 (depends on 1)

The method of claim 1, wherein the polydisperse oil is a fuser oil and the effective temperature is in the range of from about 140° C. to about 250° C.

### Claim 7 (depends on 1)

The method of claim 1, wherein the surface area to volume ratio of the layer of polydisperse oil is in the range of from about 1 cm−1 to about 10 cm−1.

### Claim 8 (depends on 1)

The method of claim 1, further comprising:
flowing gas over the layer of polydisperse oil.

### Claim 9 (depends on 1)

The method of claim 1, wherein heating is conducted under a partial vacuum.

### Claim 10 (depends on 1)

The method of claim 1, wherein the surface is a ramp and the layer of polydisperse oil is formed over the surface of ramp.

### Claim 11 (depends on 2)

The method of claim 2, wherein the polydisperse oil is a polydimethylsiloxane, and the VOCs having a molecular weight less than about 550 g/mol include linear siloxanes and cyclic siloxanes.

### Claim 12 (depends on 11)

The method of claim 11, wherein the stripped polydisperse oil contains an amount of cyclic siloxanes having a molecular weight less than about 550 g/mol that is at least 20 times lower than that of the polydisperse oil, and an amount of linear siloxanes having a molecular weight less than about 550 g/mol that is at least 20 times lower than that of the polydisperse oil.

### Claim 13 (depends on 2)

The method of claim 2, wherein the stripped polydisperse oil contains a VOC content that is at least 50 times lower than the polydisperse oil comprising VOCs, and the mass of the stripped polydisperse oil is within about 1% of the mass of the polydisperse oil.