US3947384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making matt finish coatings
Assignee: Veba Oel AG
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Filing: 1974-05-15
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Granted: 1976-03-30
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Expires: 1994-05-15
Abstract
Abstract Coatings having a matt finish are made by applying a powder varnish composition to a substrate and thereafter reacting the varnish at a temperature of 100° to 240°C to form the matt finish coating. The powder varnish composition is a finely divided, particulate mixture of I. a 1,2-epoxy compound having a melting point greater than 40°C and containing at least one 1,2-epoxy group; and Ii. a salt of a polycarboxylic acid (such as pyromellitic acid) containing three or more carboxyl groups and a cyclic amidine (such as 2-phenylimidazoline).
Inventors
- 👤 Felix Schulde
- 👤 Johann Obendorf
- 👤 Kurt Neubold
- 👤 Gunter Dormann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:50
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5093; B; B01; B01J; B01J19/00; B01J19/24; B01J19/2405
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
Powder coating composition comprising a finely divided mixture of i. a 1,2-epoxy compound having more than one 1,2-epoxy group in the molecule and a lower melting point greater than 40° C; and ii. a salt of a polycarboxylic acid having three or more carboxyl groups; and a cyclic amidine having the formula ##EQU3## wherein R is H, alkyl or aryl; R' is the same as R and in addition cycloalkyl, or a heterocycloalkyl radical obtained by substituting one or more --N--, --S--, and/or --O-- atoms in a cycloalkyl ring; R" is alkyl and aryl substituted alkylene or arylene; and X hydrogen or the radical ##EQU4## wherein R and R' are as defined previously.
Claim 2
Dependent Claim
113 words
Powder coating composition comprising a finely divided mixture of i. a 1,2-epoxy compound having more than one 1,2-epoxy group in the molecule and a lower melting point greater than 40° C; and ii. a salt of a polycarboxylic acid having three or more carboxyl groups; and a cyclic amidine having the formula ##EQU3## wherein R is H, alkyl or aryl; R' is the same as R and in addition cycloalkyl, or a heterocycloalkyl radical obtained by substituting one or more --N--, --S--, and/or --O-- atoms in a cycloalkyl ring; R" is alkyl and aryl substituted alkylene or arylene; and X hydrogen or the radical ##EQU4## wherein R and R' are as defined previously.
Claim 3
Dependent Claim
23 words
Coating composition of claim 1 wherein said salt is present in amounts of 2 to 15 weight percent, based on the epoxy compound.
Claim 4
Dependent Claim
26 words
Coating composition of claim 1 wherein the polycarboxylic acid and the cyclic amidine are in a molar ratio of 1 : 1 to 1 : 4.
Claim 5
Dependent Claim
25 words
Coating composition of claim 1 wherein the polycarboxylic acid is selected from the group of trimellitic acid, pyromellitic acid, butane tetracarboxylic acid and cyclo-pentane-tetracarboxylic acid.
Claim 6
Dependent Claim
11 words
Coating composition of claim 1 wherein the cyclic amidine is 2-phenylimidazoline.
Claim 7
Dependent Claim
15 words
Coating composition of claim 1 wherein the salt of pyromellitic acid and 2-phenylimidazoline is used.
Claim 8
Dependent Claim
26 words
Coating composition of claim 1 wherein the salt is the reaction product of 1 mole of pyromellitic acid with 2 or 4 moles 2-phenylimidazoline is used.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |