US4381334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc-rich powders
Assignee: Pratt and Lambert Inc
•
Filing: 1981-07-16
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Granted: 1983-04-26
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Expires: 2001-07-16
Abstract
Abstract A zinc-rich electrostatic powder is prepared comprising zinc incorporated homogeneously in an epoxy resin powder.
Inventors
- 👤 Leizer Balk, deceased
- 👤 James S. Sojkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:14
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/10; C09D5/106; B; B05; B05D; B05D7/00; B05D7/14; C09D163/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/269; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31511; Y10T428/31529; Y10T428/31678
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
94 words
An iron or steel substrate having a continuous sacrificial coating of the product obtained by curing a homogeneous zinc-rich powder composition consisting of zinc powder, a curable epoxy resin powder, a curing agent and a flow modifier, thereon, prepared by a process comprising blending the zinc powder with the epoxy resin, curing agent and flow modifier in molten state until a homogeneous mixture is produced, the zinc being 75%-90% by weight of the total of zinc and epoxy resin, cooling the mixture to solid form and then grinding the solid to a powder form
Claim 2
Dependent Claim
94 words
An iron or steel substrate having a continuous sacrificial coating of the product obtained by curing a homogeneous zinc-rich powder composition consisting of zinc powder, a curable epoxy resin powder, a curing agent and a flow modifier, thereon, prepared by a process comprising blending the zinc powder with the epoxy resin, curing agent and flow modifier in molten state until a homogeneous mixture is produced, the zinc being 75%-90% by weight of the total of zinc and epoxy resin, cooling the mixture to solid form and then grinding the solid to a powder form
Claim 3
Dependent Claim
16 words
A coated substrate according to claim 1 wherein the epoxy resin is a bisphenol A-epichlorhydrin resin.
Claim 4
Dependent Claim
22 words
A coated substrate according to claim 2 wherein the zinc is 85%-90% by weight of the total of zinc and epoxy resin.
Claim 5
Dependent Claim
16 words
A coated substrate according to claim 3 wherein the coating has a thickness of 2-12 mils.
Claim 6
Dependent Claim
16 words
A coated substrate according to claim 4 wherein the coating has a thickness of 4-10 mils.
Claim 7
Dependent Claim
78 words
A homogeneous zinc-rich powder composition consisting essentially of zinc powder, a curable epoxy resin powder, a curing agent and a flow modifier, prepared by a process comprising blending the zinc powder with the epoxy resin, curing agent and flow modifier in molten state until a homogeneous mixture is produced, the zinc being 75%-90% by weight of the total of zinc and epoxy resin, cooling the mixture to solid form and thereafter grinding the solid to a powder form.
Claim 8
Dependent Claim
78 words
A homogeneous zinc-rich powder composition consisting essentially of zinc powder, a curable epoxy resin powder, a curing agent and a flow modifier, prepared by a process comprising blending the zinc powder with the epoxy resin, curing agent and flow modifier in molten state until a homogeneous mixture is produced, the zinc being 75%-90% by weight of the total of zinc and epoxy resin, cooling the mixture to solid form and thereafter grinding the solid to a powder form.
Claim 9
Dependent Claim
16 words
The zinc-rich composition according to claim 6 wherein the epoxy resin is a bisphenol A-epichlorhydrin resin.
Claim 10
Dependent Claim
16 words
The zinc-rich composition according to claim 7 wherein the epoxy resin has a WPE of 450-2000.
Claim 11
Dependent Claim
20 words
The zinc-rich composition according to claim 8 wherein the zinc is 85%-90% of the total of zinc and epoxy resin.
Claim 12
Dependent Claim
101 words
A homogeneous zinc-rich powder composition consisting essentially of zinc powder, a curable epoxy resin powder, a curing agent and a flow modifier, prepared by a process comprising blending the zinc powder, epoxy resin powder, curing agent and flow modifier by any known conventional means, the zinc being 75%-90% by weight of the total of zinc and epoxy resin, then heating the preblended mixture to a temperature sufficient to melt the resin without curing it, while continuously blending the mixture until a homogeneous product is obtained, cooling the product to a solid form and thereafter grinding the solid to form a powder.
Claim 13
Dependent Claim
101 words
A homogeneous zinc-rich powder composition consisting essentially of zinc powder, a curable epoxy resin powder, a curing agent and a flow modifier, prepared by a process comprising blending the zinc powder, epoxy resin powder, curing agent and flow modifier by any known conventional means, the zinc being 75%-90% by weight of the total of zinc and epoxy resin, then heating the preblended mixture to a temperature sufficient to melt the resin without curing it, while continuously blending the mixture until a homogeneous product is obtained, cooling the product to a solid form and thereafter grinding the solid to form a powder.
Claim 14
Dependent Claim
101 words
A homogeneous zinc-rich powder composition consisting essentially of zinc powder, a curable epoxy resin powder, a curing agent and a flow modifier, prepared by a process comprising heating the epoxy resin powder containing said curing agent and said flow modifier by any known conventional means to a temperature sufficient to melt the resin without curing it, and thereafter adding the zinc powder with continuous blending until a homogeneous product is obtained, the zinc being 75%-90% by weight of the total of zinc and epoxy resin, cooling the product to a solid form and thereafter grinding the solid to form a powder.
Claim 15
Dependent Claim
101 words
A homogeneous zinc-rich powder composition consisting essentially of zinc powder, a curable epoxy resin powder, a curing agent and a flow modifier, prepared by a process comprising heating the epoxy resin powder containing said curing agent and said flow modifier by any known conventional means to a temperature sufficient to melt the resin without curing it, and thereafter adding the zinc powder with continuous blending until a homogeneous product is obtained, the zinc being 75%-90% by weight of the total of zinc and epoxy resin, cooling the product to a solid form and thereafter grinding the solid to form a powder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |