US4297188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the electrolytic coating of conductive substrates with protective films of phenolic resins
Assignee: Centro Ricerche Fiat SCpA
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Filing: 1980-09-23
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Granted: 1981-10-27
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Expires: 2000-09-23
Abstract
Abstract Process for coating a conductive substrate used as the anode in an electrochemical cell, in which a direct electric current is passed from a cathode to the said anode through an electrolytic liquid containing a phenolic monomer in order to form a polymeric film of phenolic resin on the substrate. The electrolyte includes from 10 to 200 g/l of allylphenol or a mixture of such with other phenols, and from 5 to 200 g/l of an aliphatic amine, in solution in a mixture of water and alcohol. The polymeric film is deposited by using an electric current of a density not greater than 50 mA/cm 2 of substrate, and the polymeric film so deposited is heated to a temperature of from 100° to 200° C. in order to induce the hardening of the said resin.
Inventors
- 👤 Sergio Daolio
- 👤 Guiliano Mengoli
- 👤 Carlo Folonari
- 👤 Marco Musiani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:24
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4419; C09D5/4469
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
149 words
A process for coating a conductive substrate used as the anode in an electrochemical cell in which a direct electric current is passed from a cathode to the said anode through an electrolytic liquid containing one or more phenolic monomers to form a polymeric film of phenolic resin on the substrate, which comprises using an electrolyte which includes from 10 to 200 g/l of phenolic monomer consisting of allylphenol or a mixture thereof with one or more other phenols, and from 5 to 200 g/l of an aliphatic amine, in solution in a mixture of water and alcohol in a volume ratio of from 20:1 to 0.05:1, forming the polymeric film by using an electric current of density not greater than 50 mA/cm 2 of substrate, and heating the polymeric film thus deposited at a temperature of from 100° to 200° C. to induce hardening of the said resin.
Claim 2
Dependent Claim
149 words
A process for coating a conductive substrate used as the anode in an electrochemical cell in which a direct electric current is passed from a cathode to the said anode through an electrolytic liquid containing one or more phenolic monomers to form a polymeric film of phenolic resin on the substrate, which comprises using an electrolyte which includes from 10 to 200 g/l of phenolic monomer consisting of allylphenol or a mixture thereof with one or more other phenols, and from 5 to 200 g/l of an aliphatic amine, in solution in a mixture of water and alcohol in a volume ratio of from 20:1 to 0.05:1, forming the polymeric film by using an electric current of density not greater than 50 mA/cm 2 of substrate, and heating the polymeric film thus deposited at a temperature of from 100° to 200° C. to induce hardening of the said resin.
Claim 3
Dependent Claim
11 words
The process of claim 1, wherein said phenolic monomer is allylphenol.
Claim 4
Dependent Claim
12 words
The process of claim 1, wherein said allylphenol is ortho- or meta-allylphenol.
Claim 5
Dependent Claim
10 words
The process of claim 1, wherein said allylphenol is ortho-allylphenol.
Claim 6
Dependent Claim
18 words
The process of claim 1, wherein said mixture of phenols comprises at least 25% by weight of allylphenol.
Claim 7
Dependent Claim
10 words
The process of claim 1, wherein said amine is allylamine.
Claim 8
Dependent Claim
36 words
The process of claim 1, wherein said allylphenol carries one or more substituents in the ring in positions such as not to block simultaneously the ortho and the para positions with respect to the hydroxyl group.
Claim 9
Dependent Claim
10 words
The process of claim 1, wherein said alcohol is methanol.
Claim 10
Dependent Claim
29 words
The process of claim 1, wherein the electrolyte further comprises from 0.5 to 5% by volume of flow agent to improve the surface properties and appearance of the coating.
Claim 11
Dependent Claim
24 words
The process of claim 1, wherein the electrolyte further comprises from 0.5 to 2% by weight of alkali metal or alkaline earth metal hydroxide.
Claim 12
Dependent Claim
25 words
The process of claim 1, wherein the voltage of said electric current is maintained at a constant value during the formation of the polymeric film.
Claim 13
Dependent Claim
18 words
The process of claim 1, wherein the voltage of said electric current is from 3 to 20 volts.
Claim 14
Dependent Claim
20 words
The process of claim 1, wherein said heating is carried out for a period of from 5 to 60 minutes.
References Cited (Backward Citations)
US3335075A
Cited
US3655543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |