US4428978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentrated microcapsule suspensions for reaction copying papers
Assignee: Bayer AG
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Filing: 1981-05-20
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Granted: 1984-01-31
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Expires: 2001-05-20
Abstract
Abstract A process for the production of aqueous suspensions containing from 35 to 60% by weight of microcapsules by interfacial polyaddition from polyisocyanates and H-active compounds, wherein (a) an isocyanaurate-modified aliphatic polyisocyanate is used as the polyisocyanate, and (b) the suspension is adjusted to a pH-value of ≦7 after the polyaddition reaction, which microcapsules optimally contain dye precursors and can be used for the production of completely or partly coated copying systems by the rotogravure or flexograph processes.
Inventors
- 👤 Gert Jabs
- 👤 Gunther Baatz
- 👤 Manfred Bock
- 👤 Manfred Dahm
- 👤 Artur Haus
- 👤 Christian Wegner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:24
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; B41; B41M; B41M5/00; B41M5/124; B41M5/165
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
In the process of producing an aqueous suspension containing from 35 to 60% by weight of microcapsules by interfacial polyaddition of polyisocyanate and a hydrogen active compound, the improvement wherein (a) an isocyanurate-modified aliphatic polyisocyanate is used as the polyisocyanate and (b) the suspension is adjusted to a pH value of ≦7 after the polyaddition reaction.
Claim 2
Dependent Claim
56 words
In the process of producing an aqueous suspension containing from 35 to 60% by weight of microcapsules by interfacial polyaddition of polyisocyanate and a hydrogen active compound, the improvement wherein (a) an isocyanurate-modified aliphatic polyisocyanate is used as the polyisocyanate and (b) the suspension is adjusted to a pH value of ≦7 after the polyaddition reaction.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the microcapsules contain dye precursors.
Claim 4
Dependent Claim
39 words
A method for producing a completely or partly coated copying system by the rotogravure or flexograph processes employing a printing ink wherein the microcapsule suspension produced by the process of claim 2 is a constituent of the printing ink.
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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) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |