Patent US4604308A successfully refreshed from Google Patents.
US4604308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosetting powder lacquer for covering weld seams
Assignee: VERNICOLOR AG 8627 GRUNINGEN SWITZERLAND A CORP OF SWITZERLAND
•
Filing: 1985-08-07
•
Granted: 1986-08-05
•
Expires: 2005-08-07
Abstract
Abstract The thermosetting powder lacquer is suited for covering the weld seams in metal containers for foodstuffs or beverages and comprises a mixture of at least two aromatic epoxide resins, a first component of which contains a maximum of two epoxide groups per molecule on the average and a second component of which contains more than two epoxide groups per molecule on the average, a hardener and a catalyst. As a hardener there is used a condensation product formed from the diglycidylether of bisphenol-A and bisphenol-A and as a catalyst dimethylaminophenol is used.
Inventors
- 👤 Hans R. Widmer
- 👤 Christian Schmid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:49
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/32; C08G59/38; C08G59/182; C08G59/40; C09; C09D; C09D163/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
113 words
A metal container comprising: a weld seam; an interior weld seam cover; said weld seam cover comprising a flexible thermoset lacquer; and said flexible thermoset lacquer essentially consisting of: a polyaddition product formed by an aromatic epoxide resin mixture including at least two components a first of which contains a maximum of two epoxide groups per molecule on the average and a second of which which contains more than two epoxide groups per molecule on the average; a hardener selected from the group: condensation product of the diglycidylether of bisphenol-A and bisphenol-A, acidic polyester on the basis of trimellitic acid anhydride and aliphatic polyol, phenolic resin, or a mixture thereof; and a catalyst.
Claim 2
Dependent Claim
113 words
A metal container comprising: a weld seam; an interior weld seam cover; said weld seam cover comprising a flexible thermoset lacquer; and said flexible thermoset lacquer essentially consisting of: a polyaddition product formed by an aromatic epoxide resin mixture including at least two components a first of which contains a maximum of two epoxide groups per molecule on the average and a second of which which contains more than two epoxide groups per molecule on the average; a hardener selected from the group: condensation product of the diglycidylether of bisphenol-A and bisphenol-A, acidic polyester on the basis of trimellitic acid anhydride and aliphatic polyol, phenolic resin, or a mixture thereof; and a catalyst.
Claim 3
Dependent Claim
30 words
The metal container as defined in claim 1, wherein: said first component of said aromatic epoxide resin mixture comprises an aromatic epoxide resin on the basis of epichlorohydrin and bisphenol-A.
Claim 4
Dependent Claim
30 words
The metal container as defined in claim 1, wherein: said second component of said aromatic epoxide resin mixture comprises an aromatic epoxide resin on the basis an epoxidized novolac resin.
Claim 5
Dependent Claim
40 words
The metal container as defined in claim 3, wherein: said epoxidized novolac resin is present in the aromatic epoxide resin mixture in an amount in the range of 5 to 15 percent by weight of the aromatic epoxide resin mixture.
Claim 6
Dependent Claim
56 words
The metal container as defined in claim 1, wherein: said aromatic epoxide resin mixture and the hardener formed by said condensation product of the diglycidylether of bisphenol-A and bisphenol-A are present in respective amounts in the range of 72 to 73 and in the range of 25 to 27 percent by weight of the thermoset lacquer.
Claim 7
Dependent Claim
35 words
The metal container as defined in claim 1, wherein: said catalyst is selected from the group: imidazole, 2-methyl imidazole, ethyltriphenylphosphoniumchloride or another salt thereof, aluminum acetylacetonate, primary, secondary or tertiary aminophenol, toluene sulfonic acid salt.
Claim 8
Dependent Claim
33 words
The metal container as defined in claim 1, wherein: said thermoset lacquer additionally comprising an additive selected from the group: leveling agent, pourability assisting agent, pigment, filler, thickening agent, or a mixture thereof.
Claim 9
Dependent Claim
26 words
The metal container as defined in claim 5, wherein: said filler is present in a maximum amount of 30 percent by weight of the thermoset lacquer.
Claim 10
Dependent Claim
27 words
The metal container as defined in claim 1, wherein: said thermoset lacquer forms a strip covering the weld seam and overlapping the same on both sides thereof.
Claim 11
Dependent Claim
20 words
The metal container as defined in claim 1, wherein: said flexible thermoset lacquer is deformable conjointly with said metal container.
References Cited (Backward Citations)
US3367990A
Cited
US3932343A
Cited
US4151305A
Cited
US4169187A
Cited
US4324822A
Cited
US4440914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |