US4440612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous compositions curable through a transesterification curing mechanism
Assignee: PPG Industries Inc
•
Filing: 1983-05-11
•
Granted: 1984-04-03
•
Expires: 2003-05-11
Abstract
Abstract Coating compositions comprising a polymeric polyol with a polyester crosslinking agent having at least two beta-alkoxyester groups per molecule are disclosed. The compositions, when applied to a substrate and cured in the presence of a transesterification catalyst, give solvent-resistant coatings.
Inventors
- 👤 Joseph T. Valko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:55
CPC Classifications
C; C09; C09D; C09D167/00; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C09D163/00; C09D201/00; C09D201/02; C09D201/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
In a method of coating a conductive substrate serving as a cathode in an electrical circuit comprising said cathode and an anode immersed in an aqueous electrodepositable coating composition, said method comprising passing electric current between said cathode and said anode to cause a coating to deposit on said cathode; said coating composition comprising a polymeric polyol containing cationic groups, a polyester crosslinking agent and a transesterification catalyst, characterized in that the polyester crosslinking agent has at least two beta-alkoxyester groups per molecule and the coating composition is substantially free of polyesters containing more than one beta-hydroxyester group per molecule.
Claim 2
Dependent Claim
100 words
In a method of coating a conductive substrate serving as a cathode in an electrical circuit comprising said cathode and an anode immersed in an aqueous electrodepositable coating composition, said method comprising passing electric current between said cathode and said anode to cause a coating to deposit on said cathode; said coating composition comprising a polymeric polyol containing cationic groups, a polyester crosslinking agent and a transesterification catalyst, characterized in that the polyester crosslinking agent has at least two beta-alkoxyester groups per molecule and the coating composition is substantially free of polyesters containing more than one beta-hydroxyester group per molecule.
Claim 3
Dependent Claim
28 words
The method of claim 1 in which the crosslinking agent is prepared from reacting a polycarboxylic acid or its functional equivalent thereof with one or more 1,2-polyol monoethers.
Claim 4
Dependent Claim
29 words
The method of claim 2 in which the polycarboxylic acid or its functional equivalent thereof is selected from the class consisting of trimellitic anhydride, adipic acid, and phthalic anhydride.
Claim 5
Dependent Claim
31 words
The method of claim 2 in which the 1,2-polyol monoether is an alkyl ether of ethylene or propylene glycol in which the alkyl group contains from 1 to 6 carbon atoms.
References Cited (Backward Citations)
GB739701A
Cited
US3937679A
Cited
GB1283653A
Cited
GB1525331A
Cited
US4101486A
Cited
GB1531046A
Cited
EP0008262A1
Cited
US4307153A
Cited
EP0012463A1
Cited
US4332711A
Cited
US4352842A
Cited
EP0040867A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |