US4331714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making flake silver powders with chemisorbed monolayer of dispersant
Assignee: EIDP Inc
•
Filing: 1979-12-21
•
Granted: 1982-05-25
•
Expires: 1999-12-21
Abstract
Abstract Flake silver powders which have a chemisorbed monolayer of organic dispersing agent such as oleic acid on the surfaces and process for their preparation are provided. Such silver powders can be formulated into thick film pastes at above 85% solids levels at relatively low viscosities. Pastes so obtained, when printed and fired, result in films of excellent conductive efficiency.
Inventors
- 👤 Leo W. Tyran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:40
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/006; B; B82; B82Y; B82Y30/00; C09C1/00; C09C1/62; C09C1/622; C01; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/20; C01P2004/51; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/10; C01P2006/11; C01P2006/12; C01P2006/22; C01P2006/40; C01P2006/80; H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A process for preparing flake silver powder comprising the steps of (a) preparing an admixture of precipitated silver powder, liquid milling medium, and at least 0.2% by weight hydrophobic unsaturated carboxylic acid, (b) bead-milling the admixture for a time sufficient to form a monolayer of the carboxylic acid on at least 1/3 of the particle surfaces, and (c) separating the liquid milling medium and beads from the resultant flake silver particles.
Claim 2
Dependent Claim
71 words
A process for preparing flake silver powder comprising the steps of (a) preparing an admixture of precipitated silver powder, liquid milling medium, and at least 0.2% by weight hydrophobic unsaturated carboxylic acid, (b) bead-milling the admixture for a time sufficient to form a monolayer of the carboxylic acid on at least 1/3 of the particle surfaces, and (c) separating the liquid milling medium and beads from the resultant flake silver particles.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the milling medium is water.
Claim 4
Dependent Claim
23 words
The process of claim 2 wherein said carboxylic acid is selected from the group consisting of oleic acid, linoleic acid, and linolenic acid.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein said carboxylic acid is oleic acid.
Claim 6
Dependent Claim
22 words
The process of claim 3 wherein the silver particles have a substantially complete monolayer of carboxylic acid chemisorbed on the particle surfaces.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the carboxylic acid constitutes 0.2 to 1.5% by weight of the admixture.
References Cited (Backward Citations)
US4115107A
Cited
US4186244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |