Patent US4847152A successfully refreshed from Google Patents.
US4847152A
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Microcapsules with improved polyurea walls
Assignee: Bayer AG
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Filing: 1987-10-07
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Granted: 1989-07-11
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Expires: 2007-10-07
Abstract
Abstract Improved microcapsules contain at least one wall which is the reaction product of at least one isocyanate-reactive group and an aromatic isocyanate which has the formula: ##STR1## in which n=8 to 20. The microcapsules are useful in carbonless copy paper.
Inventors
- 👤 Gert Jabs
- 👤 Ulrich Nehen
- 👤 Hans J. Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/771; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; B41; B41M; B41M5/00; B41M5/124; B41M5/165; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0866; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3228; C08G18/74; C08G18/76; C08G18/7614; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
Microcapsules containing at least one core material and at least one wall consisting essentially of the reaction product of at least one isocyanate with at least one isocyanate-reactive compound with an active H atom, the isocyanate being of the formula ##STR5## in which n=8 to 20.
Claim 2
Dependent Claim
46 words
Microcapsules containing at least one core material and at least one wall consisting essentially of the reaction product of at least one isocyanate with at least one isocyanate-reactive compound with an active H atom, the isocyanate being of the formula ##STR5## in which n=8 to 20.
Claim 3
Dependent Claim
18 words
Microcapsules according to claim 1, in which the isocyanate-reactive compound with an active H atom is an amine.
Claim 4
Dependent Claim
18 words
Microcapsules according to claim 1, in which the isocyanate-reactive compound with an active H atom is an alcohol.
Claim 5
Dependent Claim
13 words
Microcapsules according to claim 1, in which the core material contains dyestuff precursor.
Claim 6
Dependent Claim
50 words
Carbonless copying paper containing microcapsules containing at least one core material and at least one wall consisting essentially of the reaction product of at least one isocyanate with at least one isocyanate-reactive compound with an active H atom, the isocyanate being of the formula ##STR6## in which n=8 to 20.
Claim 7
Dependent Claim
50 words
Carbonless copying paper containing microcapsules containing at least one core material and at least one wall consisting essentially of the reaction product of at least one isocyanate with at least one isocyanate-reactive compound with an active H atom, the isocyanate being of the formula ##STR6## in which n=8 to 20.
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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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |