US4874832A
Expired / Lapsed
US
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Microcapsules having polyurethane walls
Assignee: Bayer AG
•
Filing: 1988-12-09
•
Granted: 1989-10-17
•
Expires: 2008-12-09
Abstract
Abstract Improved microcapsules have a capsule wall which contains a polyurethane which can be obtained by reacting an isocyanate with a polyether polyol which contains amino groups.
Inventors
- 👤 Gert Jabs
- 👤 Adolf Richartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:31
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2989
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
A single walled microcapsule having a single polyurethane containing in which at least 50% of the capsule wall consists of a polyurethane which is obtained by reacting a diisocyanate and/or polyisocyanate with a polyether polyol which contains at least one tertiary amino group.
Claim 2
Dependent Claim
43 words
A single walled microcapsule having a single polyurethane containing in which at least 50% of the capsule wall consists of a polyurethane which is obtained by reacting a diisocyanate and/or polyisocyanate with a polyether polyol which contains at least one tertiary amino group.
Claim 3
Dependent Claim
19 words
Microcapsules according to claim 1, in which the molecular weight of the polyether polyol is between 100 and 3,000.
Claim 4
Dependent Claim
33 words
Microcapsules according to claim 1, in which the polyether polyol is obtained from the reaction of an epoxide with an amine selected from the group consisting of ammonia, a diamine and an alkanolamine.
Claim 5
Dependent Claim
15 words
Microcapsules according to claims 3, in which the epoxide is ethylene oxide or propylene oxide.
Claim 6
Dependent Claim
13 words
Microcapsules according to claim 1, in which the polyisocyanate is an aliphatic isocyanate.
Claim 7
Dependent Claim
47 words
Pressure-sensitive reaction copy paper containing microcapsules having a single polyurethane containing capsule wall in which at least 50% of the capsule wall consists of a polyurethane which is obtained by reacting a diisocyanate and/or polyisocyanate with a polyether polyol which contains at least one tertiary amino group.
Claim 8
Dependent Claim
47 words
Pressure-sensitive reaction copy paper containing microcapsules having a single polyurethane containing capsule wall in which at least 50% of the capsule wall consists of a polyurethane which is obtained by reacting a diisocyanate and/or polyisocyanate with a polyether polyol which contains at least one tertiary amino group.
Claim 9
Dependent Claim
12 words
Copy paper according to claim 6, wherein the microcapsules enclose dyestuff precursors.
Claim 10
Dependent Claim
8 words
Microcapsules according to claim 1, enclosing dyestuff precursors.
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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |