US4517141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of microcapsules having walls of polyaddition products of water-insoluble polyamines with water-soluble polyisocyanate adducts
Assignee: Bayer AG
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Filing: 1983-06-21
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Granted: 1985-05-14
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Expires: 2003-06-21
Abstract
Abstract Microcapsules having a hydrophobic core material and capsule walls formed by the reaction of water-insoluble polyamines with water-soluble bisulphite adducts of polyisocyanates, a process for the production thereof which is characterized in that a mixture of a hydrophobic core material and water-insoluble polyamines is emulsified in water or in an aqueous protective colloid solution to the required particle size, water-soluble bisulphite adducts of polyisocyanates in the form of powders or aqueous solutions are added and the mixture is left to react to completion at temperatures of from 1° to 140° C., and applications thereof.
Inventors
- 👤 Manfred Dahm
- 👤 Norbert Weimann
- 👤 Ulrich Nehen
- 👤 Hanns P. Muller
- 👤 Gert Jabs
- 👤 Albert Awater
- 👤 James M. Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8083; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; B41; B41M; B41M5/00; B41M5/124; B41M5/165; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3253; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10S430/00; Y10S430/001; Y10S430/104; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2989
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
A process for the production of a microcapsule having a hydrophobic core material and a capsule wall formed from the reaction of a polyisocyanate adduct and a polyamine, said process comprising emulsifying in water or in an aqueous protective colloid solution a mixture of a hydrophobic core material and a water-insoluble polyamine, adding a water-soluble polyisocyanate bisulphite adduct in the form of powder or an aqueous solution and allowing the mixture to react to completion at a temperature of from 1° to 140° C.
Claim 2
Dependent Claim
84 words
A process for the production of a microcapsule having a hydrophobic core material and a capsule wall formed from the reaction of a polyisocyanate adduct and a polyamine, said process comprising emulsifying in water or in an aqueous protective colloid solution a mixture of a hydrophobic core material and a water-insoluble polyamine, adding a water-soluble polyisocyanate bisulphite adduct in the form of powder or an aqueous solution and allowing the mixture to react to completion at a temperature of from 1° to 140° C.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1 wherein the water-insoluble constituents of the emulsion comprise from 0.5 to 50%, by weight, thereof.
Claim 4
Dependent Claim
17 words
A process as claimed in claims 1 and 2 wherein the hydrophobic core material comprises a dye-precursor.
Claim 5
Dependent Claim
55 words
A process as claimed in claim 3 wherein the dye-precursor is selected from 3,3-bis-(p-dimethylaminophenyl)phtalide, 4,4'-bis-dimethylaminobenzhydrilbenzl ether, N-halogen phenyl leucolamine, N-β-naphthyl leucolamine, N-2,4,5-trichlorophenyl leucolamine, N-2,4-dichlorophenyl leucolamine, rhodamine-β-anilinolactam, rhodamine-β-(p-nitroaniline)-lactam, rhodamine-β-(p-chloroaniline)-lactam, 7-dimethylamino-2-methoxy-fluorane, 7-diethylamino-3-methoxyfluorane, 7-diethylamino-3-methyl-fluorane, 7-diethylamino-3-chloro-fluorane, 7-diethylamino-3-chloro-2-methyl-fluorane, 7-diethylamino-2,4-dimethyl-fluorane, 7-diethylamino-2,3-dimethyl-fluorane, 7-diethylamino-(3-acetylmethylamino)-fluorane, 7-diethylamino-3-methyl-fluorane, 3,7-diethylamino-fluorane, 7-diethylamino-3-(dibenzylamino)-fluorane, 7-diethylamino-3-(methyl-benzylamino)-fluorane, 7-diethylamino-3-(chloroethylmethylamino)-fluorane, 7-diethylamino-3-(dichloroethylamino)-fluorane, 3,3-bis-(p-dimethylaminophenyl)-6-dimethylaminophthalide, 7-diethyl-amino-3-(diethylamino)-fluorane, N-benzoyl leucomethylene blue, o-chlorobenzoyl leucomethylene blue, p-nitrobenzoyl leucomethylene blue and 3-methyl-2,2'-spiro-bis-(benzo(f)-chromene).
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |