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Patent US4248978A successfully refreshed from Google Patents.
US4248978A
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Pulverulent coating composition
Assignee: Bayer AG
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Filing: 1979-05-02
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Granted: 1981-02-03
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Expires: 1999-05-02
Abstract
Abstract Compounds having a melting point above 40° C. which compounds contain uretone imine groups and which are substantially free from volatile isocyanate blocking agents which are split off under stoving conditions are excellent crosslinking agents for pulverulent coating compositions based on hydroxyl groups-containing polymers.
Inventors
- 👤 Eckhard de Cleur
- 👤 Rolf Dhein
- 👤 Hans Rudolph
- 👤 Hans J. Kreuder
- 👤 Hanns P. Muller
- 👤 Walter Schafer
- 👤 Kuno Wagner
- 👤 Kurt Findeisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C09; C09D; C09D175/00; C08G2150/00; C08G2150/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
Binders for pulverulent coating compositions consisting of: (a) from 25 to 95%, by weight, preferably from 50 to 95%, by weight, of at least one monomer, oligomer or polymer containing hydroxyl, urethane, carboxyl, mercapto, amino, amide, urea or thiourea groups and having a glass transition temperature of from 40° to 200° C. (determined by differential thermoanalysis); and (b) from 5 to 75%, by weight, preferably from 5 to 50%, by weight, of at least one blocked polyisocyanate having a melting point of from 40° to 220° C., preferably from 60° to 180° C.; the percentages of (a) and (b) adding up to 100; characterised in that the cross-linking agent (b) contains at least one uretone imine group per molecule.
Claim 2
Dependent Claim
119 words
Binders for pulverulent coating compositions consisting of: (a) from 25 to 95%, by weight, preferably from 50 to 95%, by weight, of at least one monomer, oligomer or polymer containing hydroxyl, urethane, carboxyl, mercapto, amino, amide, urea or thiourea groups and having a glass transition temperature of from 40° to 200° C. (determined by differential thermoanalysis); and (b) from 5 to 75%, by weight, preferably from 5 to 50%, by weight, of at least one blocked polyisocyanate having a melting point of from 40° to 220° C., preferably from 60° to 180° C.; the percentages of (a) and (b) adding up to 100; characterised in that the cross-linking agent (b) contains at least one uretone imine group per molecule.
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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |