US5114796A
Expired / Lapsed
US
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Fast curing and storage stable thermoset polymer thick film compositions
Assignee: Acheson Industries Inc
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Filing: 1991-07-29
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Granted: 1992-05-19
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Expires: 2011-07-29
Abstract
Abstract A thermally curable polymer thick film compositions comprising, by weight: (a) about 3-15 parts of at least one poly(hydroxystyrene) resin; (b) a crosslinking resin selected from the group consisting of: (i) about 5-25 parts of at least one blocked isocyanate resin; or (ii) about 2-10 parts of at least one melamineformaldehyde resin; (c) an effective amount of at least one organic solvent capable of substantially dissolving (a) and (b) ingredients; (d) conductive particulate matter selected from the group consisting of: (i) about 50-80 parts silver flake; (ii) a graphite/carbon black mixture consisting of: (aa) about 15-45 parts graphite; and (bb) about 1-10 parts carbon black; or (iii) a mixture of (i) and (ii).
Inventors
- 👤 Richard L. Frentzel
- 👤 Warren R. Oakdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:47
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/095; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6204; C08L; C08L25/00; C08L25/18; C08L61/00; C08L61/20; C08L61/26; C08L61/28; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31931; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31967
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
119 words
A substrate having a cured conductive polymer thick film coating thereon which comprises a cured admixture of: (a) a cured resin system comprising a reaction product of: (i) about 3-15 parts by weight of at least one poly(hydroxystyrene) resin; and (ii) a crosslinking resin selected from the group consisting of: (aa) about 5-25 parts by weight of at least one blocked isocyanate resin; (bb) about 2-10 parts by weight of at least one melamine-formaldehyde resin; (b) a conductive material selected from the group consisting of: (i) about 50-80 parts by weight silver flakes; and (ii) an admixture of about 15-45 parts by weight graphite and about 1-10 parts by weight carbon black. (iii) a mixture of (i) and (ii).
Claim 2
Dependent Claim
119 words
A substrate having a cured conductive polymer thick film coating thereon which comprises a cured admixture of: (a) a cured resin system comprising a reaction product of: (i) about 3-15 parts by weight of at least one poly(hydroxystyrene) resin; and (ii) a crosslinking resin selected from the group consisting of: (aa) about 5-25 parts by weight of at least one blocked isocyanate resin; (bb) about 2-10 parts by weight of at least one melamine-formaldehyde resin; (b) a conductive material selected from the group consisting of: (i) about 50-80 parts by weight silver flakes; and (ii) an admixture of about 15-45 parts by weight graphite and about 1-10 parts by weight carbon black. (iii) a mixture of (i) and (ii).
Claim 3
Dependent Claim
11 words
The coated substrate of claim 1, wherein said substrate is flexible.
Claim 4
Dependent Claim
11 words
The coated substrate of claim 2, wherein said substrate is rigid.
Claim 5
Dependent Claim
17 words
The coated substrate of claim 3, wherein said rigid substrate is a phenolic paper printed wiring board.
Claim 6
Dependent Claim
25 words
The coated substrate of claim 1 wherein said poly(hydroxystyrene) resin is a linear poly(p-hydroxystyrene) resin having a molecular weight from about 6,000 to about 250,000.
Claim 7
Dependent Claim
17 words
The coated substrate of claim 5 containing from about 4-14 parts by weight of said poly(p-hydroxystyrene) resin.
Claim 8
Dependent Claim
20 words
The coated substrate of claim 1 wherein said blocked isocyanate resin is a blocked aliphatic isocyanate based on hexamethylene di-isocyanate.
Claim 9
Dependent Claim
17 words
The coated substrate of claim 7 containing about 7-23 parts by weight of said blocked isocyanate resin.
Claim 10
Dependent Claim
12 words
The coated substrate of claim 1 wherein said melamine-formaldehyde resin is hexamethoxymethylmelamine.
Claim 11
Dependent Claim
16 words
The coated substrate of claim 9 containing about 3-9 parts by weight of said hexamethoxymethylmelamine resin.
Claim 12
Dependent Claim
14 words
The coated substrate of claim 1 wherein said conductive particulate matter is silver flake.
Claim 13
Dependent Claim
14 words
The coated substrate of claim 11 containing about 52-75 parts by weight silver flake.
Claim 14
Dependent Claim
19 words
The coated substrate of claim 1 wherein said conductive particulate matter is a mixture of graphite and carbon black.
Claim 15
Dependent Claim
21 words
The coated substrate of claim 13 containing about 20-35 parts by weight graphite and about 2-8 parts by weight carbon black.
References Cited (Backward Citations)
US4704231A
Cited
US4971726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |