US3725340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of crosslinkable powder lacquers
Assignee: Bayer AG
•
Filing: 1971-01-21
•
Granted: 1973-04-03
•
Expires: 1991-01-21
Abstract
Abstract Reacting lacquer resins containing hydroxyl groups with a softening point of from 50* to 150* C. and an alkoxymethyl isocyanate in the melt in a temperature-controlled screw extruder.
Inventors
- 👤 R Germedonk
- 👤 J Pedain
- 👤 R Erdmenger
- 👤 M Ullrich
- 👤 B Quiring
- 👤 F Wingler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:29
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0895; B; B01; B01J; B01J19/00; B01J19/18; B01J19/20; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/58; C08G18/62; C08G18/6216; C08G18/622; C08G18/6225; C08G18/6229; C08G18/70; C08G18/71; C08G18/711; C08G2150/00; C08G2150/20; Y; Y10; Y10S; Y10S528/00; Y10S528/902
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
16 words
The process as claimed in claim 1, wherein methoxymethyl isocyanate is used as the alkoxymethyl isocyanate.
Claim 2
Dependent Claim
19 words
The process as claimed in claim 1, wherein a polyester containing hydroxyl groups is used as the lacquer resin.
Claim 3
Dependent Claim
20 words
The process as claimed in claim 1 wherein a polyepoxide resin containing hydroxyl groups is used as the lacquer resin.
Claim 4
Dependent Claim
20 words
The process as claimed in claim 1, wherein a polyacrylate resin containing hydroxyl groups is used as the lacquer resin.
Claim 5
Dependent Claim
28 words
The process as claimed in claim 1, wherein the reaction is carried out in the presence of a catalyst which accelerates the reaction between isocyanates and hydroxyl groups.
Claim 6
Dependent Claim
27 words
The process as claimed in claim 1, wherein the reaction is carried out in a self-cleaning twin-shaft screw extruder with screw shafts rotating in the same direction.
Claim 7
Dependent Claim
28 words
The process as claimed in claim 1 wherein the lacquer resin is introduced into the screw extruder in the solid form and fused in a separate melting zone.
Claim 8
Dependent Claim
24 words
The process as claimed in claim 1, wherein volatile constituents are removed from the melt in a separate evaporation zone of the screw extruder.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |