US4416753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for electrocoating an electrically conductive substrate
Assignee: BASF Farben und Fasern AG
•
Filing: 1981-11-12
•
Granted: 1983-11-22
•
Expires: 2001-11-12
Abstract
Abstract A process for coating an electrically conductive substrate, connected as the cathode, with a cationic coating agent from an electrocoating bath and subsequently hardening the coating, is characterized in that an aqueous dispersion made from A. cationic, synthetic resins which have been protonated with acids, contain basic groups and are in a dissolved or dispersed form and B. dispersed, finely divided, ionic plastics is used as the cationic coating agent.
Inventors
- 👤 Wolfgang Batzill
- 👤 Horst Diefenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:39
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4488; C09D5/4492
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
In a process for coating an electrically conductive substrate comprising connecting said substrate as the cathode in an electrocoating process, immersing said connected substrate in an electrocoating bath containing a cationic coating agent, carrying out an electrodeposition of said cationic coating agent on said substrate to produce said substrate coated with said cationic coating agent and hardening said substrate coated with said cationic coating agent, the improvement comprising said cationic coating agent comprising an aqueous dispersion comprising a mixture of: A. water dispersed or water soluble cationic synthetic resins containing basic groups prepared by reacting resins containing epoxide groups and bases selected from the group consisting of organic amines and Mannich bases followed by protonation with acids to form a carrier resin; and B. dispersed, finely divided, ionic plastics selected from the group consisting of epoxide resins, polyester resins, acrylate resin, polyurethane resins and polyamide resins having ionic groups selected from the group consisting of ammonium, sulfonium and phosphonium ions neutralized with acids.
Claim 2
Dependent Claim
163 words
In a process for coating an electrically conductive substrate comprising connecting said substrate as the cathode in an electrocoating process, immersing said connected substrate in an electrocoating bath containing a cationic coating agent, carrying out an electrodeposition of said cationic coating agent on said substrate to produce said substrate coated with said cationic coating agent and hardening said substrate coated with said cationic coating agent, the improvement comprising said cationic coating agent comprising an aqueous dispersion comprising a mixture of: A. water dispersed or water soluble cationic synthetic resins containing basic groups prepared by reacting resins containing epoxide groups and bases selected from the group consisting of organic amines and Mannich bases followed by protonation with acids to form a carrier resin; and B. dispersed, finely divided, ionic plastics selected from the group consisting of epoxide resins, polyester resins, acrylate resin, polyurethane resins and polyamide resins having ionic groups selected from the group consisting of ammonium, sulfonium and phosphonium ions neutralized with acids.
Claim 3
Dependent Claim
77 words
The process of claim 1, wherein component A is the reaction product of polyepoxide compounds having 2 to 3 epoxide groups per molecule with primary or secondary amines and protonated with carboxylic acids and component B has a particle size distribution in which at least 95% of the particles are smaller than 30 μm and said ionic plastics are second synthetic resins containing basic groups and the weight ratio of B to A is 0.1 to 100/l.
Claim 4
Dependent Claim
76 words
The process of claim 1, wherein component A is the reaction product of polyepoxide compounds having 2 to 3 epoxide groups per molecule with Mannich bases and protonated with carboxylic acids and component B has a particle size distribution in which at least 95% of the particles are smaller than 30 μm and the said ionic plastics are second synthetic resins containing basic groups and the weight ratio of B to A is 0.1 to 100/l.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein said aqueous dispersion has a solids content of 5 to 30%.
Claim 6
Dependent Claim
40 words
The process of claim 1, wherein said hardening is carried out at a temperature between 140° C. and 220° C. by stoving and components A and B combine to form a compatible film having a thickness of about 150 μm.
Claim 7
Dependent Claim
20 words
The process of claim 2, wherein components A and B have a glass transition temperature of 30° to 150° C.
Claim 8
Dependent Claim
20 words
The process of claim 3, wherein components A and B have a glass transition temperature of 30° to 150° C.
Claim 9
Dependent Claim
11 words
The process of claim 1, wherein said aqueous dispersion contains pigments.
Claim 10
Dependent Claim
11 words
The process of claim 8, wherein said aqueous dispersion contains fillers.
Claim 11
Dependent Claim
26 words
The process of claim 1, wherein said aqueous dispersion contains additional cross-linking agents selected from the group consisting of melamine resins, blocked polyisocyanates and phenolic resins.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |