Patent US4623481A successfully refreshed from Google Patents.
US4623481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive primers
Assignee: EIDP Inc
•
Filing: 1984-09-21
•
Granted: 1986-11-18
•
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 11:16
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.
References Cited (Backward Citations)
US2682515A
Cited
US3655595A
Cited
US3928156A
Cited
US3837981A
Cited
US3819567A
Cited
US3992346A
Cited
US3971745A
Cited
US4115599A
Cited
US4065316A
Cited
US4160064A
Cited
JPS5442625A
Cited
US4225460A
Cited
US4237252A
Cited
US4354911A
Cited
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 |