US3923743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cross-linkable pulverulent coating compositions based on uretdione polyisocyanates
Assignee: Bayer AG
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Filing: 1974-02-28
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Granted: 1975-12-02
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Expires: 1994-02-28
Abstract
Abstract A pulverulent coating composition adapted to be applied to a substrate by spraying as a powder is prepared by a process which comprises reacting an organic polyisocyanate containing a uretdione group with an organic compound containing groups which contain reactive hydrogen atoms determinable by the Zerewitinoff method wherein the functionality of the reactants and the proportions thereof are chosen to provide an average functionality between about 2.05 and 10, the ratio of reactive hydrogen groups to -NCO groups is between about 1.07 to 1 and about 2.5 to 1 and the amount of polyisocyanate containing uretdione groups is sufficient to provide from about 0.6 percent to about 25 percent by weight uretdione groups.
Inventors
- 👤 Bernd Quiring
- 👤 Kuno Wagner
- 👤 Richard Muller
- 👤 Peter Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:25
CPC Classifications
C; C09; C09D; C09D175/00; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/798; C08G2150/00; C08G2150/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
198 words
A PROCESS FOR THE PRODUCTION OF A BRANCHED POLYURETHANE OR POLYJRETHANE UREA POLYADDITION PRODUCT HAVING FREE OH GROUPS AND A MOLECULAR WEIGHT IN THE RANGE OF 1100 TO 3000 WHICH IS STABLE IN STORAGE AND SUITABLE FOR USE AS A BINDER FOR LACQUER POWDERS WHICH SET AT TEMPERATURE ABOVE 110*C, CAN BE CONVERTED INTO POWDERS BELOW 50*C AND HAVE A SOFTENING OR MELTING POINT BETWEEN ABOUT 50*C AND ABOUT 180*C, WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE CONTAINING URETDIONE GROUPS OR A MIXTURE OF URETDIONE GROUP-CONTAINING AND URETDIONE GROUP-FREE ORGANIC POLYISOCYANATES WITH COMPOUNDS CONTAINING FREE OH GROUPS WHEREIN A. THE FUNCTIONALITY OF THE REACTANTS WHICH TAKE PART IN THE POLYADDITION REACTION AND THEIR PROPORTIONS ARE SO CHOSEN THAT THE AVERAGE FUNCTIONALITY OF THE PRODUCTS OF THE PROCESS, BASED ON THE REACTIVE END GROUPS IN THE PRODUCTS, IS BETWEEN ABOUT 3.8 AND 4.5, B. THE COMPONENTS WHICH TAKE PART IN THE REACTION ARE USED IN QUANTITIES CORRESPONDING TO AN EQUIVALENT RATIO OF HYDROXYL GROUPS:IXOCYANATE GROUPS OF BETWEEN ABOUT 1.07:1 AND ABOUT 2.5:1, AND C. THE QUANTITY OF POLYISOCYANATE WHICH CONTAINS A URETDIONE GROUP IN THE REACTION MIXTURE IS SUFFICIENT TO PROVIDE ABOUT 0.6% TO 25% BY WEIGHT OF URETDIONE GROUPS.
Claim 2
Dependent Claim
198 words
A PROCESS FOR THE PRODUCTION OF A BRANCHED POLYURETHANE OR POLYJRETHANE UREA POLYADDITION PRODUCT HAVING FREE OH GROUPS AND A MOLECULAR WEIGHT IN THE RANGE OF 1100 TO 3000 WHICH IS STABLE IN STORAGE AND SUITABLE FOR USE AS A BINDER FOR LACQUER POWDERS WHICH SET AT TEMPERATURE ABOVE 110*C, CAN BE CONVERTED INTO POWDERS BELOW 50*C AND HAVE A SOFTENING OR MELTING POINT BETWEEN ABOUT 50*C AND ABOUT 180*C, WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE CONTAINING URETDIONE GROUPS OR A MIXTURE OF URETDIONE GROUP-CONTAINING AND URETDIONE GROUP-FREE ORGANIC POLYISOCYANATES WITH COMPOUNDS CONTAINING FREE OH GROUPS WHEREIN A. THE FUNCTIONALITY OF THE REACTANTS WHICH TAKE PART IN THE POLYADDITION REACTION AND THEIR PROPORTIONS ARE SO CHOSEN THAT THE AVERAGE FUNCTIONALITY OF THE PRODUCTS OF THE PROCESS, BASED ON THE REACTIVE END GROUPS IN THE PRODUCTS, IS BETWEEN ABOUT 3.8 AND 4.5, B. THE COMPONENTS WHICH TAKE PART IN THE REACTION ARE USED IN QUANTITIES CORRESPONDING TO AN EQUIVALENT RATIO OF HYDROXYL GROUPS:IXOCYANATE GROUPS OF BETWEEN ABOUT 1.07:1 AND ABOUT 2.5:1, AND C. THE QUANTITY OF POLYISOCYANATE WHICH CONTAINS A URETDIONE GROUP IN THE REACTION MIXTURE IS SUFFICIENT TO PROVIDE ABOUT 0.6% TO 25% BY WEIGHT OF URETDIONE GROUPS.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the reaction is carried out at temperatures of about 0*C to 150*C.
Claim 4
Dependent Claim
22 words
The process of claim 2 wherein the reaction mixture contains a catalyst for the reaction between isocyanato groups and reactive hydrogen atoms.
Claim 5
Dependent Claim
8 words
The product of the process of claim 1.
Claim 6
Dependent Claim
49 words
The process of making a two-component composition which comprises combining the product of the process of claim 1 with from about 5% to about 45% by weight, based on the weight of said product, of a polyhydroxyl compound having a molecular weight of from about 400 to about 6,000.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |