# US 2014/0191841 A1 · Conformal coating to scavenge elemental sulfur

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- Number: US 2014/0191841 A1
- Document ID: US20140191841A1
- Status: Published application
- Kind: A1
- Application number: 13/734,313
- Filed: 2013-01-04
- Published: 2014-07-10
- Earliest claimed: 2013-01-04
- Assignees: International Business Machines Corporation
- Applicants: International Business Machines Corporation
- Inventors: Dylan J. Boday; Joseph Kuczynski; Jason T. Wertz; Jing Zhang
- Web page: https://patentgrep.com/patent/US20140191841A1

## CPC

- H01C 1/028: the resistive element being embedded in insulation with outer enclosing sheath
- H01C 7/003: {Thick film resistors}
- H01C 17/02: adapted for manufacturing resistors with envelope or housing (apparatus or processes for filling or compressing insulating material in heating element tubes H05B3/52)
- H01C: RESISTORS

## Abstract

A corrosion-resistant apparatus may contain an electronic component having a first metal and a polymer coating covering the electronic component. The polymer coating includes polymer chains with unsaturated groups to scavenge sulfur and an anionic initiator dispersed in the polymer coating to convert cyclic elemental sulfur to linear polysulfide.

## Claims

### Claim 1

A corrosion-resistant apparatus comprising:
an electronic component containing a first metal; and
a polymer coating covering the electronic component, the polymer coating comprising:
polymer chains with unsaturated groups for scavenging sulfur; and
an anionic initiator dispersed in the polymer coating for converting cyclic elemental sulfur to linear polysulfide.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the anionic initiator comprises an anion selected from the group consisting of carbonates, carboxylates, phosphines, thiols, thiolates, sulfides, and organometallic compounds.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein the anionic initiator comprises a second metal selected from the group consisting of sodium, calcium, potassium, magnesium, barium, and strontium.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the electronic component is a resistor.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the unsaturated groups are selected from the group consisting of vinyl, allyl, and acrylate.

### Claim 6 (depends on 1)

The apparatus of claim 1, further comprising an accelerator compound dispersed in the polymer coating.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the accelerator compound is selected from the group consisting of benzothiazoles, sulfenamides, sulfenimides, guanidines, thiurams, dithiocarbamates, amines, xanthates, and dithiophosphates.

### Claim 8 (depends on 6)

The apparatus of claim 6, further comprising an activator compound dispersed in the polymer coating.

### Claim 9 (depends on 1)

The apparatus of claim 1, wherein the polymer chains comprise silicone, the unsaturated groups are unsaturated pendant groups on the polymer chains, the first metal is silver, and the anionic initiator is a carbonate.

### Claim 10

A method for coating an electronic device comprising:
providing an electronic component containing a first metal; and
covering the electronic component with a polymer coating, the polymer coating comprising:
polymer chains having unsaturated groups for scavenging sulfur; and
an anionic initiator dispersed in the polymer coating for converting cyclic elemental sulfur to linear polysulfide.

### Claim 11 (depends on 10)

The method of claim 10, wherein the anionic initiator comprises an anion selected from the group consisting of carbonates, carboxylates, phosphines, thiols, thiolates, sulfides, and organometallic compounds.

### Claim 12 (depends on 11)

The method of claim 11, wherein anionic initiator further comprises a second metal selected from the group consisting of sodium, calcium, potassium, magnesium, barium, and strontium.

### Claim 13 (depends on 10)

The method of claim 10, wherein the electronic component is a resistor.

### Claim 14 (depends on 10)

The method of claim 10, wherein the unsaturated groups are selected from the group consisting of vinyl, allyl, and acrylate.

### Claim 15 (depends on 10)

The method of claim 10, wherein the polymer coating further comprises an accelerator compound dispersed in the polymer coating.

### Claim 16 (depends on 15)

The method of claim 15, wherein the accelerator compound is selected from a group consisting of benzothiazoles, sulfenamides, sulfenimides, guanidines, thiurams, dithiocarbamates, amines, xanthates, and dithiophosphates.

### Claim 17 (depends on 15)

The method of claim 15, wherein the polymer coating further comprises an activator compound dispersed in the polymer coating.

### Claim 18 (depends on 17)

The method of claim 17, wherein the accelerator compound, activator compound, and anionic initiator are dispersed discretely in the polymer coating.

### Claim 19 (depends on 10)

The method of claim 10, wherein the polymer chains comprise silicone, the unsaturated groups are unsaturated pendant groups on the polymer chains, the first metal is silver, and the anionic initiator is a carbonate.

### Claim 20 (depends on 19)

The method of claim 19, further comprising exposing the polymer coating to an atmosphere containing cyclic elemental sulfur.