US4193889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microencapsulation with modified aliphatic polyisocyanates
Assignee: Bayer AG
•
Filing: 1977-11-29
•
Granted: 1980-03-18
•
Expires: 1997-11-29
Abstract
Abstract Microcapsules and a process for the production of these microcapsules the walls of which consist of polycondensates of a film-forming aliphatic polyisocyanate containing at least one biuret group or polyaddition products thereof with a chain-extending agent.
Inventors
- 👤 Gunther Baatz
- 👤 Walter Schafer
- 👤 Manfred Dahm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7831; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0866; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2989
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
39 words
Microcapsules having walls which comprise a polycondensate of a film-forming aliphatic polyisocyanate containing at least one biuret group or a polyaddition product thereof with a chain-extending agent selected from the group consisting of water, a polyol and a polyamine.
Claim 2
Dependent Claim
39 words
Microcapsules having walls which comprise a polycondensate of a film-forming aliphatic polyisocyanate containing at least one biuret group or a polyaddition product thereof with a chain-extending agent selected from the group consisting of water, a polyol and a polyamine.
Claim 3
Dependent Claim
26 words
Microcapsules as claimed in claim 1, wherein the polyisocyanate is a biuret group-containing reaction product of hexamethylene-1,6-diisocyanate with water, tertiary butanol, formic acid or an amine.
Claim 4
Dependent Claim
19 words
Microcapsules as claimed in claim 1, wherein polycondensation is produced by a tertiary amine or a basically acting compound.
Claim 5
Dependent Claim
76 words
A process for the production of microcapsules, wherein a film-forming aliphatic polyisocyanate containing biuret groups, or a solution thereof in an inert solvent, is dissolved or dispersed in materials to be encapsulated, the resulting solution or dispersion is emulsified in water, a tertiary amine initiating the polycondensation reaction or a basically acting compound or an NCO-reactive chain-extending agent is added, the reaction mixture obtained is admixed until the microcapsules are formed, and the microcapsules are isolated.
Claim 6
Dependent Claim
76 words
A process for the production of microcapsules, wherein a film-forming aliphatic polyisocyanate containing biuret groups, or a solution thereof in an inert solvent, is dissolved or dispersed in materials to be encapsulated, the resulting solution or dispersion is emulsified in water, a tertiary amine initiating the polycondensation reaction or a basically acting compound or an NCO-reactive chain-extending agent is added, the reaction mixture obtained is admixed until the microcapsules are formed, and the microcapsules are isolated.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 4, wherein the polyisocyanate containing biuret groups is a reaction product of hexamethylene-1,6-diisocyanate with water, tertiary butanol, formic acid or an amine.
Claim 8
Dependent Claim
20 words
A process as claimed in claim 4, wherein the chain-extending agent is water, a diol or polyol or a polyamine.
Claim 9
Dependent Claim
21 words
A process as claimed in claim 4, wherein the catalytically active compound is a tertiary amine or a basically acting compound.
Claim 10
Dependent Claim
10 words
Microcapsules produced by a process as claimed in claim 4.
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) | 1983-03-18 | 1983-09-17 | 1984-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-18 | 1987-09-17 | 1988-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-18 | 1991-09-17 | 1992-03-18 | $7700.00 | Window Closed / Lapsed |