US4623481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive primers
Assignee: EIDP Inc
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Filing: 1984-09-21
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Granted: 1986-11-18
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Expires: 2004-09-21
Abstract
Abstract An epoxyester linear block oligomer made with n-1 moles fatty acid units terminated with carboxylic acid groups and n moles of epoxy oligomer, when filled with carbon black, is a particularly effective electrically conductive primer for use over organic-based composites to be electrostatically painted.
Inventors
- 👤 Jozef T. Huybrechts
- 👤 August T. Timmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:49
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4045; C08G18/42; C08G18/4294; C08G18/58; C08G18/581; C09; C09D; C09D175/00; C09D5/00; C09D5/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
An electrically conductive coating composition comprising (a) 5-40% by weight of a block-copolymerized linear oligomer having an average of 3 to 20 mole units of alternating units of n moles of linear epoxy oligomers terminated with oxirane groups on each end and an Mn in the range of 300-5000, and (n-1) moles of fatty acid units terminated with carboxylic acid groups on each of two ends and having at least 9 carbon atoms, said linear oligomer being terminated on each end with units of said epoxy oligomers, (b) 1-20% of a blocked isocyanate which can be unblocked in the coating composition by heating at temperatures not higher than 140° C., (c) 1-30% of an aminoplast crosslinking agent, (d) 0-40% by weight of pigment and extenders, (e) 2-5% by volume based on binder solids of a conductive carbon black, and (f) 20-80% by weight of organic solvents, having a specific conductivity measured as a dry, cured film of at least 5×10 -3 (Ωcm) - 1.
Claim 2
Dependent Claim
164 words
An electrically conductive coating composition comprising (a) 5-40% by weight of a block-copolymerized linear oligomer having an average of 3 to 20 mole units of alternating units of n moles of linear epoxy oligomers terminated with oxirane groups on each end and an Mn in the range of 300-5000, and (n-1) moles of fatty acid units terminated with carboxylic acid groups on each of two ends and having at least 9 carbon atoms, said linear oligomer being terminated on each end with units of said epoxy oligomers, (b) 1-20% of a blocked isocyanate which can be unblocked in the coating composition by heating at temperatures not higher than 140° C., (c) 1-30% of an aminoplast crosslinking agent, (d) 0-40% by weight of pigment and extenders, (e) 2-5% by volume based on binder solids of a conductive carbon black, and (f) 20-80% by weight of organic solvents, having a specific conductivity measured as a dry, cured film of at least 5×10 -3 (Ωcm) - 1.
Claim 3
Dependent Claim
28 words
The coating composition of claim 1 wherein the block epoxy ester is the reaction product of a bisphenol A diepoxy resin with a C 36 -based aliphatic diacid.
Claim 4
Dependent Claim
15 words
The coating composition of claim 1 wherein the blocked isocyanate is a ketoxime-blocked aliphatic isocyanate.
Claim 5
Dependent Claim
27 words
The coating composition of claim 1 wherein the crosslinking agent is selected from the group consisting of melamine formaldehyde resins, urea formaldehyde resins aand benzoguanamine formaldehyde resins.
Claim 6
Dependent Claim
18 words
The coating composition of claim 4 wherein the crosslinking agent is a reactive partially alkylated melamine formaldehyde resin.
Claim 7
Dependent Claim
32 words
A coated substrate comprising a substrate of an organic-based composite material coated with a cured coating composition of claim 1, giving an electrical conductivity of at least 5×10 -3 (Ωcm) - 1.
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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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |