Bio-based conformal coating for sulfur sequestration using polyhydroxyalkanoates

Patent metadata

Field	Value
Publication number	US-10283233-B2
Application number	US-201615195398-A
Country	US
Kind code	B2
Filing date	Jun 28, 2016
Priority date	Jun 28, 2016
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

Embodiments described herein provide methods of processing an electronic component, comprising mixing a bio-based polymer having sulfur-reactive substituents with a sulfurization catalyst and a solvent to form a coating material; applying the coating material to an electronic component; and removing the solvent to form a sulfur-reactive polymer coating that is resistant to sulfur penetration. The bio-based polymer may be made by bacterial fermentation of unsaturated fatty acids.

First claim

What is claimed is:

1. A method of processing an electronic component, comprising:
mixing (a) a polyhydroxyalkanoate comprising sulfur-reactive substituents, (b) one or more of a sulfurization catalyst, accelerator, and activator, and (c) a solvent to form a coating material, wherein the polyhydroxyalkanoate is formed from a vinyl-terminated fatty acid or a combination of a vinyl-terminated fatty acid and an aliphatic fatty acid;
applying the coating material to an electronic component; and
removing the solvent to form a sulfur-reactive polymer coating that is resistant to sulfur penetration.

2. The method of claim 1 , wherein the sulfur-reactive polymer coating has an unsaturation ratio of 0.01 to 1.

3. The method of claim 1 , further comprising partially cross-linking the sulfur-reactive polymer coating to form a partially cross-linked sulfur-reactive polymer coating.

4. The method of claim 3 , wherein the partially cross-linked sulfur-reactive polymer coating has an unsaturation ratio of at least 0.2.

5. The method of claim 1 , further comprising pre-sulfurizing the sulfur-reactive polymer coating.

6. The method of claim 5 , wherein pre-sulfurizing the sulfur-reactive polymer coating comprises exposing the electronic component having the sulfur-reactive polymer coating to a nitrogen atmosphere loaded with elemental sulfur up to about 1 wt %.

7. The method of claim 1 , wherein the vinyl-terminated fatty acid has the structure

wherein R 2 is (CH 2 ) x and x is from 2 to 7.

8. The method of claim 1 , wherein the vinyl-terminated fatty acid is a biorenewable vinyl-terminated fatty acid.

9. A method of processing an electronic component, comprising:
mixing (a) a polyhydroxyalkanoate comprising vinyl containing substituents, (b) one or more of a sulfurization catalyst, accelerator, and activator, and (c) a solvent to form a coating material, wherein the polyhydroxyalkanoate is formed from a vinyl-terminated fatty acid or a combination of a vinyl-terminated fatty acid and an aliphatic fatty acid;
applying the coating material to an electronic component; and
removing the solvent to form a sulfur-reactive polymer coating that is resistant to sulfur penetration.

10. The method of claim 9 , wherein the sulfur-reactive polymer coating has an unsaturation ratio of 0.01 to 1.

11. The method of claim 9 , further comprising partially cross-linking the sulfur-reactive polymer coating to form a partially cross-linked sulfur-reactive polymer coating.

12. The method of claim 9 , further comprising pre-sulfurizing the sulfur-reactive polymer coating.

13. The method of claim 12 , wherein pre-sulfurizing the sulfur-reactive polymer coating comprises exposing the electronic component having the sulfur-reactive polymer coating to a nitrogen atmosphere loaded with elemental sulfur up to about 1 wt %.

14. The method of claim 9 , wherein the vinyl-terminated fatty acid has the structure

wherein R 2 is (CH 2 ) x and x is from 2 to 7.

15. The method of claim 9 , wherein the vinyl-terminated fatty acid is a biorenewable vinyl-terminated fatty acid.

Assignees

• IBM

Inventors

• King Scott B
• Kobilka Brandon M
• Kuczynski Joseph
• Wertz Jason T

Classifications

• H01B3/421 Primary

  Polyesters · CPC title

• H05K5/06

  Hermetically-sealed casings {(specially adapted for small components H05K5/0095)} · CPC title

• B05D3/0433

  the gas being a reactive gas · CPC title

• H05K3/28

  Applying non-metallic protective coatings {(H05K3/0091 takes precedence; methods for intermediate insulating layers for build-up multilayer circuits H05K3/4673)} · CPC title

• B05D1/00

  Processes for applying liquids or other fluent materials (B05D5/00, B05D7/00 take precedence) · CPC title