Patent US4668580A successfully refreshed from Google Patents.
US4668580A
Expired / Lapsed
US
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Continuous production of microcapsule dispersions
Assignee: Bayer AG
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Filing: 1985-06-03
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Granted: 1987-05-26
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Expires: 2005-06-03
Abstract
Abstract Process for the production of microcapsule dispersions according to the polyaddition process, wherein an inert organic liquid is continuously mixed under strong turbulence with a polyisocyanate, insoluble therein, this mixture is emulsified in an aqueous phase as dispersed phase and the emulsion formed is continuously reacted with a polyamine.
Inventors
- 👤 Manfred Dahm
- 👤 Gert Jabs
- 👤 Georg Wawra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:59
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; B41; B41M; B41M5/00; B41M5/124; B41M5/165; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0866; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A two-step process for the production of microcapsules by interfacial polyaddition of polyisocyanates and H-active compounds wherein (i) in a first stage an inert organic phase and a polyisocyanate insoluble therein are continuously metered into a mixing zone under strong turbulence to obtain an inhomogenous mixture, and (ii) in a second stage this inhomogeneous mixture is continuously emulsified in an aqueous phase with a di- or polyamine added to the resulting emulsion and polyadded to the interface with the polyisocyanate.
Claim 2
Dependent Claim
80 words
A two-step process for the production of microcapsules by interfacial polyaddition of polyisocyanates and H-active compounds wherein (i) in a first stage an inert organic phase and a polyisocyanate insoluble therein are continuously metered into a mixing zone under strong turbulence to obtain an inhomogenous mixture, and (ii) in a second stage this inhomogeneous mixture is continuously emulsified in an aqueous phase with a di- or polyamine added to the resulting emulsion and polyadded to the interface with the polyisocyanate.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein the organic phase contains dissolved dye-precursors.
Claim 4
Dependent Claim
19 words
Dye-precursor-containing microcapsules made by a process according to claim 2, for use in the production of carbon-free copying paper.
References Cited (Backward Citations)
FR1415039A
Cited
GB1091077A
Cited
US3864275A
Cited
US3886085A
Cited
GB2011341A
Cited
US4275905A
Cited
US4324817A
Cited
DE3245801A1
Cited
GB2111456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |