Patent US4729792A successfully refreshed from Google Patents.
US4729792A
Expired / Lapsed
US
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Microcapsules, printing inks and their production
Assignee: Standard Register Co
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Filing: 1986-05-22
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Granted: 1988-03-08
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Expires: 2006-05-22
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 polycationic polyamine having a functionality of at least three. The polyanion is preferably casein. If the surface of the microcapsules formed in the aqueous solution is lipophilized, the microcapsules easily separate from the solution by filtration. By use of a suitable wetting agent, the filter cake can be used in place of the pigment in any conventional printing ink. The microcapsules may be used in carbonless copy paper technology.
Inventors
- 👤 Michael E. A. Seitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:17
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: 20
Claim 1
Independent Claim
109 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 which can be made substantially nonpolar by reaction with a lipophilizing agent 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 said oily solution and microcapsules are produced, and adding a sufficient amount of a lipophilizing agent to cause the outer surface of said microcapsules to become substantially nonpolar.
Claim 2
Dependent Claim
109 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 which can be made substantially nonpolar by reaction with a lipophilizing agent 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 said oily solution and microcapsules are produced, and adding a sufficient amount of a lipophilizing agent to cause the outer surface of said microcapsules to become substantially nonpolar.
Claim 3
Dependent Claim
25 words
The process of claim 1, wherein said microcapsules are filtered from said aqueous solution to obtain a filter cake containing less than about 35% water.
Claim 4
Dependent Claim
9 words
The product produced by the process of claim 2.
Claim 5
Dependent Claim
13 words
The process of claim 1, wherein said oily solution contains a dye precursor.
Claim 6
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 7
Dependent Claim
33 words
The process of claim 1, wherein said polyanion is selected from the group consisting of casein, sodium caseinate, zein, soya protein, polyacrylic acids, acrylic acid copolymers, maleic acid copolymers, and maleic anhydride copolymers.
Claim 8
Dependent Claim
10 words
The process of claim 1, wherein said polyanion is casein.
Claim 9
Dependent Claim
12 words
The process of claim 7, wherein said polycationic polyamine is diethylene triamine.
Claim 10
Dependent Claim
12 words
The process of claim 8, wherein said crosslinking agent is a polyisocyanate.
Claim 11
Dependent Claim
17 words
A process in accordance with claim 1, wherein said polysalt is formed prior to said dispersing step.
Claim 12
Dependent Claim
16 words
A process in accordance with claim 1, wherein said polysalt is formed after said dispersing step.
Claim 13
Dependent Claim
119 words
A process for making a printing ink comprising: mixing a printing ink vehicle with a wetting agent, and adding a filter cake of microcapsules prepared by the process of 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 functionality of at least three, whereby a hard thick layer is formed around the droplets of oily solution and microcapsules are produced. adding a sufficient amount of a lipophilizing agent to cause the outer surface of said microcapsules to become substantially non-polar, and filtering said microcapsules from said aqueous solution to obtain the filter cake of microcapsules.
Claim 14
Dependent Claim
119 words
A process for making a printing ink comprising: mixing a printing ink vehicle with a wetting agent, and adding a filter cake of microcapsules prepared by the process of 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 functionality of at least three, whereby a hard thick layer is formed around the droplets of oily solution and microcapsules are produced. adding a sufficient amount of a lipophilizing agent to cause the outer surface of said microcapsules to become substantially non-polar, and filtering said microcapsules from said aqueous solution to obtain the filter cake of microcapsules.
Claim 15
Dependent Claim
24 words
The process of claim 12, wherein said ink is an oil-based ink and the wetting agent is selected from ethoxylated C 12-22 alkyl amines.
Claim 16
Dependent Claim
28 words
The process of claim 12, wherein said ink is a glycol-based ink and the wetting agent is an ethoxylated long-chain amine having from 12 to 22 carbon atoms.
Claim 17
Dependent Claim
37 words
The process of claim 12, wherein the ink is oil-based and the wetting agent is chosen such that a salt is formed with the polyanion which renders the capsules oleophilic and separates them from their water jackets.
Claim 18
Dependent Claim
25 words
The process of claim 15, wherein the wetting agent is selected from the group consisting of N,N-diethanol soya amine and stearyl dimethyl benzyl ammonium chloride.
Claim 19
Dependent Claim
24 words
The process of claim 12, wherein the ink is glycol-based and the wetting agent is selected from the group consisting of monoethanolamine and N,N-diethylethanolamine.
Claim 20
Dependent Claim
9 words
The product produced by the process of claim 12.
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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) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |