US4898780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of microcapsules
Assignee: Standard Register Co
•
Filing: 1988-01-07
•
Granted: 1990-02-06
•
Expires: 2008-01-07
Abstract
Abstract Microcapsules having hard, thick walls are formed by dispersing an oily solution containing a crosslinking agent in an aqueous solution, and forming a polysalt in the aqueous solution, the polysalt including a high molecular weight polyanion and a low molecular weight polycationic polyamine having a functionality of at least three. The polyanion is preferably casein. The microcapsules may be used in a CB ink for preparing carbonless copy paper.
Inventors
- 👤 Michael E. A. Seitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:56
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/165; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A process for the production of microcapsules containing an oily solution, comprising: dispersing an oily solution including a crosslinking agent into an aqueous solution; forming a polysalt in said aqueous solution, said polysalt including a high molecular weight polyanion and a polycationic polyamine having a molecular weight of less than 1200 and having a functionality of at least three, whereby a hard, thick layer is formed around droplets of oily solution and microcapsules are produced.
Claim 2
Dependent Claim
75 words
A process for the production of microcapsules containing an oily solution, comprising: dispersing an oily solution including a crosslinking agent into an aqueous solution; forming a polysalt in said aqueous solution, said polysalt including a high molecular weight polyanion and a polycationic polyamine having a molecular weight of less than 1200 and having a functionality of at least three, whereby a hard, thick layer is formed around droplets of oily solution and microcapsules are produced.
Claim 3
Dependent Claim
13 words
The process of claim 1, wherein said oily solution contains a dye precursor.
Claim 4
Dependent Claim
24 words
The process of claim 1, wherein the crosslinking agent is selected from the group consisting of polyisocyanates, polyacid chlorides, polyanhydrides, polyepoxides, polychloroformates, and polyaldehydes.
Claim 5
Dependent Claim
33 words
The process of claim 1, wherein said polyanion is selcted from the group consisting of casein, sodium caseinate, zein, soya protein, polyacrylic acids, acrylic acid copolymers, maleic acid copolymers, and maleic anhydride copolymers.
Claim 6
Dependent Claim
10 words
The process of claim 1, wherein said polyanion is casein.
Claim 7
Dependent Claim
12 words
The process of claim 5, wherein said polycationic polyamine is diethylene triamine.
Claim 8
Dependent Claim
12 words
The process of claim 6, wherein said crosslinking agent is a polyisocyanate.
Claim 9
Dependent Claim
17 words
A process in accordance with claim 1, wherein said polysalt is formed prior to said dispersing step.
Claim 10
Dependent Claim
16 words
A process in accordance with claim 1, wherein said polysalt is formed after said dispersing step.
Claim 11
Dependent Claim
9 words
The product produced by the process of claim 1.
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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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |