US5401535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precious metal composition
Assignee: Johnson Matthey PLC
•
Filing: 1993-11-23
•
Granted: 1995-03-28
•
Expires: 2013-11-23
Abstract
Abstract A homogeneous composition for forming on firing a film of precious metal, which is one or more of platinum, palladium, gold and silver, on a substrate, for instance to decorate table ware, comprises polymeric resin and a solution, in water and a co-solvent, of thiolate of the precious metal, the composition containing 3-22% by weight of the precious metal as the thiolate, and the co-solvent, resin and thiolate being such that as the composition on a substrate dries and is progressively heated in firing, the water evaporates off to leave a homogeneous composition of the resin and thiolate in the co-solvent, then the co-solvent evaporates off to leave a homogeneous composition of the thiolate in the resin, and then the thiolate decomposes to the precious metal while the resin volatilize.
Inventors
- 👤 Peter T. Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:35
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C17/00; C03C17/06; C03C17/10; C04B41/45; C04B41/4505; C04B41/4511; C04B41/455; C04B41/4554; C04B41/50; C04B41/51; C04B41/5111; C04B41/5116; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C07; C07C; C07C323/00; C07C323/50; C07C323/51; C07C323/60; C07K; C07K5/00; C07K5/02; C07K5/0212; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372; C23; C23C; C23C18/00; C23C18/02; C23C18/08; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/251; C03C2217/254; C03C2217/255; C03C2217/27; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/30; C03C2218/32; C04B2103/00; C04B2103/0068; C04B2103/0093; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31678; Y10T428/31681; Y10T428/31703; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
140 words
A method of forming a film of precious metal which is one or more of platinum, palladium, gold and silver on a substrate, which method comprises applying a homogeneous composition to a substrate and drying and firing the applied composition, said composition comprising polymeric resin and a solution, in water and a co-solvent, of thiolate of the precious metal, the composition containing 3-22% by weight of the precious metal as the thiolate, and the co-solvent, resin and thiolate being such that as the composition on the substrate dries and is progressively heated in firing, the water evaporates off to leave a homogeneous composition of the resin and thiolate in the co-solvent, then the co-solvent evaporates off to leave a homogeneous composition of the thiolate in the resin, and then the thiolate decomposes to the precious metal while the resin volatilizes.
Claim 2
Independent Claim
140 words
A method of forming a film of precious metal which is one or more of platinum, palladium, gold and silver on a substrate, which method comprises applying a homogeneous composition to a substrate and drying and firing the applied composition, said composition comprising polymeric resin and a solution, in water and a co-solvent, of thiolate of the precious metal, the composition containing 3-22% by weight of the precious metal as the thiolate, and the co-solvent, resin and thiolate being such that as the composition on the substrate dries and is progressively heated in firing, the water evaporates off to leave a homogeneous composition of the resin and thiolate in the co-solvent, then the co-solvent evaporates off to leave a homogeneous composition of the thiolate in the resin, and then the thiolate decomposes to the precious metal while the resin volatilizes.
Claim 3
Dependent Claim
15 words
A method according to claim 1, wherein the composition contains 5-85% by weight of water.
Claim 4
Dependent Claim
15 words
A method according to claim 1, wherein the composition contains 40-55% by weight of water.
Claim 5
Dependent Claim
11 words
A method of claim 1, wherein the precious metal comprises gold.
Claim 6
Dependent Claim
65 words
method according to claim 4 wherein the thiolate is a gold compound of the formula Au--S--R--H or Au--S--R--X or a salt of either, in which: X represents a nitro group or a group of the formula --COOH, --SO 2 OH, --OH, --CONH 2 --NH 2 , or --O--P(O)(OH) 2 , any of whose hydrogen atoms are optionally substituted and R represents a divalent organic group.
Claim 7
Dependent Claim
31 words
A method according to claim 5, wherein the gold compound of formula Au--S--R--H or Au--S--R--X is such that H--R--S--H or H--S--R--X represents: N-(2-mercaptopropionyl)glycine; N-(3-mercaptopropionyl)glycine; N-(2-mercaptoacetyl)glycine; 2-mercaptoacetyl-L-histidine; 3-mercaptopropionyl-L-histidine; L-cysteine; acetylcysteine; or glutathione.
Claim 8
Dependent Claim
20 words
A method according to claim 1, wherein the composition contains 8-12% by weight of the precious metal as the thiolate.
Claim 9
Dependent Claim
28 words
A method according to claim 1 wherein the resin comprises polyvinyl pyrrolidine, polymethacrylic or polycellulose ether resin, the majority of which volatilizes in the range of 200°-550° C.
Claim 10
Dependent Claim
16 words
A method according to claim 1 wherein the composition contains 5-45% by weight of the resin.
Claim 11
Dependent Claim
16 words
A method according to claim 1, wherein the co-solvent has a boiling point between 100°-220° C.
Claim 12
Dependent Claim
15 words
A method according to claim 1 wherein the co-solvent comprises water-miscible alcohol, ester or ether.
Claim 13
Dependent Claim
13 words
A method according to claim 11, wherein the alcohol comprises 1,2-propanediol or 1,3-propanediol.
Claim 14
Dependent Claim
16 words
A method according to claim 1 wherein the composition contains 5-45% by weight of the co-solvent.
Claim 15
Dependent Claim
30 words
A method according to claim 1, wherein the composition contains in addition precious metal powder or insoluble precious metal compound to produce a burnished film on firing and then burnishing.
Claim 16
Dependent Claim
23 words
A method according to claim 1, wherein the composition contains in addition an insoluble matting agent to produce a self-burnished film on firing.
Claim 17
Dependent Claim
17 words
A method according to claim 1 wherein the substrate on which firing occurs is ceramic or glass.
Claim 18
Dependent Claim
13 words
A method according to claim 1 wherein the firing is at 460°-900° C.
Claim 19
Independent Claim
142 words
A method of forming a film of precious metal, which is one or more of platinum, palladium, gold and silver, on a transfer substrate to prepare a transfer, by applying a homogeneous composition to the transfer substrate and drying the applied composition, said composition comprising polymeric resin and a solution, in water and a co-solvent, of thiolate of the precious metal, the composition containing 3-22% by weight of the precious metal as the thiolate, and the co-solvent, resin and thiolate being such that as the composition on a substrate dries and is progressively heated in firing, the water evaporates off to leave a homogeneous composition of the resin and thiolate in the co-solvent, then the co-solvent evaporates off to leave a homogeneous composition of the thiolate in the resin, and then the thiolate decomposes to the precious metal while the resin volatilizes.
Claim 20
Independent Claim
142 words
A method of forming a film of precious metal, which is one or more of platinum, palladium, gold and silver, on a transfer substrate to prepare a transfer, by applying a homogeneous composition to the transfer substrate and drying the applied composition, said composition comprising polymeric resin and a solution, in water and a co-solvent, of thiolate of the precious metal, the composition containing 3-22% by weight of the precious metal as the thiolate, and the co-solvent, resin and thiolate being such that as the composition on a substrate dries and is progressively heated in firing, the water evaporates off to leave a homogeneous composition of the resin and thiolate in the co-solvent, then the co-solvent evaporates off to leave a homogeneous composition of the thiolate in the resin, and then the thiolate decomposes to the precious metal while the resin volatilizes.
References Cited (Backward Citations)
US1207284A
Cited
DE392656C
Cited
US2370593A
Cited
US2490717A
Cited
US2509198A
Cited
US2490399A
Cited
US2660549A
Cited
US2994614A
Cited
US3018191A
Cited
US3163665A
Cited
US3245809A
Cited
US3391010A
Cited
US3438748A
Cited
GB1533628A
Cited
GB1603472A
Cited
GB2047672A
Cited
GB2097811A
Cited
GB2154248A
Cited
US4780502A
Cited
GB2216536A
Cited
EP0491147A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |