Ink for screen printing
US-2019119519-A1 · Apr 25, 2019 · US
Fine silver particle dispersion
US11072715B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11072715-B2 |
| Application number | US-201916375095-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 4, 2019 |
| Priority date | Apr 4, 2019 |
| Publication date | Jul 27, 2021 |
| Grant date | Jul 27, 2021 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
This disclosure relates to a conductive paste comprising a fine silver particle dispersion and a glass frit, wherein the fine silver particle dispersion comprising: (1) 65 to 95.4% by weight of fine silver particles which have average primary particle diameter of 10 to 190 nm and which comprise 25% by number or less of silver particles having primary particle diameter of 100 nm or larger, (2) 4.5 to 34.5% by weight of a solvent, (3) 0.1 to 1.0% by weight of ethyl cellulose having weight average molecular weight of 10,000 to 120,000. Also provided are: a method of manufacturing an electrically conductive thick film comprising steps of: (a) applying said fine silver particle dispersion on a substrate, and (b) heating the applied fine silver particle dispersion at 80 to 1000° C.; and an electrical device comprising a conductive thick film made with the foregoing paste.
First claim
Opening claim text (preview).
What is claimed is: 1. A conductive paste comprising a fine silver particle dispersion and a glass frit, wherein the fine silver particle dispersion comprises: (1) 65 to 95.4% by weight of fine silver particles which have an average primary particle diameter of 10 to 190 nm and which comprise 25% by number or less of silver particles having a primary particle diameter of 100 nm or larger, (2) 4.5 to 34.5% by weight of a solvent, and (3) 0.1 to 1.0% by weight of ethyl cellulose having a weight average molecular weight of 10,000 to 120,000. 2. The conductive paste of claim 1 , wherein the fine silver particles are coated with an organic protective material. 3. The conductive paste of claim 2 , wherein the organic protective material is an amine with carbon number of from 8 to 12. 4. The conductive paste of claim 1 , wherein a boiling point of the solvent is 150 to 350° C. 5. The conductive paste of claim 1 , wherein the solvent is selected from the group consisting of diethylene glycol monobutyl ether, diethylene glycol dibutyl ether, diethylene glycol monobutyl ether acetate, terpineol, and any mixture thereof. 6. The conductive paste of claim 1 , wherein the ethyl cellulose has a weight average molecular weight of 30,000 to 105,000. 7. The conductive paste of claim 1 , wherein the ethyl cellulose has a weight average molecular weight of 50,000 to 90,000. 8. The conductive paste of claim 1 , wherein the fine silver particle dispersion comprises 0.3 to 0.9% by weight of the ethyl cellulose. 9. The conductive paste of claim 1 , wherein the fine silver particle dispersion comprises 0.6 to 0.9% by weight of the ethyl cellulose. 10. The conductive paste of claim 1 , wherein the fine silver particles have an average primary particle diameter of 25 to 110 nm. 11. The conductive paste of claim 1 , wherein the fine silver particle dispersion comprises 70 to 87% by weight of the fine silver particles. 12. The conductive paste of claim 1 , wherein the fine silver particles comprise 15% by number or less of silver particles having a primary particle diameter of 100 nm or larger. 13. The conductive paste of claim 1 , wherein an amount of a substance having a weight average molecular weight of 150,000 or more in the fine silver particle dispersion is 0.09% by weight or less. 14. The conductive paste of claim 1 , wherein the fine silver particle dispersion comprises 11.1 to 31.5% by weight of the solvent. 15. The conductive paste of claim 1 , wherein an amount of a substance having a weight average molecular weight of 150,000 or more in the fine silver particle dispersion is 0.05% by weight or less.
Assignees
Inventors
Classifications
Silver · CPC title
Glass · CPC title
- C09D5/24Primary
Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title
Additives being defined by their diameter · CPC title
- C09D101/28Primary
Alkyl ethers · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11072715B2 cover?
- This disclosure relates to a conductive paste comprising a fine silver particle dispersion and a glass frit, wherein the fine silver particle dispersion comprising: (1) 65 to 95.4% by weight of fine silver particles which have average primary particle diameter of 10 to 190 nm and which comprise 25% by number or less of silver particles having primary particle diameter of 100 nm or larger, (2) 4…
- Who is the assignee on this patent?
- Du Pont
- What technology area does this patent fall under?
- Primary CPC classification C09D5/24. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 27 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).