US3674704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming minute capsules and three-phase capsule-forming system useful in said process
Assignee: NCR Voyix Corp
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Filing: 1971-03-29
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Granted: 1972-07-04
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Expires: 1991-03-29
Abstract
Abstract A process is disclosed for manufacturing minute capsules, en masse, in a liquid manufacturing vehicle wherein the capsules contain water or aqueous solutions. The capsules have seamless walls of a specific kind of hydrophobic polymeric material which polymeric material has been found particularly impervious to permeation and diffusion by the aqueous contents. The hydrophobic polymeric material used is poly(ethylene-co-vinyl acetate) having the vinyl acetate groups hydrolyzed to vinyl alcohol groups in the amount of 38 to 55 percent.
Inventors
- 👤 Robert G Bayless
- 👤 Charles P Shank
- 👤 Ruth A Botham
- 👤 Dennis W Werkmeister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:32
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/08; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6212; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
The process of claim 1 wherein, of the poly(ethylene-co-vinyl acetate), ethylene groups constitute 70 to 85 percent of the total polymer groups present.
Claim 2
Dependent Claim
144 words
In a process of forming minute capsules, en masse, which comprises: (a) establishing an agitated system consisting of a liquid vehicle constituting a major portion of the system by volume and forming a continuous liquid first phase, a second phase dispersed therein, consisting of minute mobile entities of capsule core material, and a third phase dispersed therein constituting a minor but significant portion of said system by volume, and consisting of minute mobile liquid entities of a wall-forming solution of a hydrophobic polymeric material, said three phases being mutually immiscible, whereby said wall-forming solution deposits on and around the capsule core entities to form a protective wall, and (b) hardening the walls so formed: the improvement which comprises utilizing, as the hydrophobic polymeric material, poly(ethylene-co-vinyl acetate) having the vinyl acetate groups hydrolyzed to vinyl alcohol groups in the amount of 38 to 55 percent.
Claim 3
Dependent Claim
23 words
The process of claim 3 wherein, of the poly(ethylene-co-vinyl acetate), ethylene groups constitute 70 to 85 percent of the total polymer groups present.
Claim 4
Dependent Claim
31 words
The process of claim 3 wherein hardening the protective wall is accomplished by reaction with a treatment material selected from the group of materials consisting of diisocyanates, polyisocyanates and diacid chlorides.
Claim 5
Dependent Claim
18 words
The process of claim 3 wherein hardening the protective wall is accomplished by reaction with an alkali alkoxide.
Claim 6
Dependent Claim
121 words
A three-phase capsule-forming system capable of forming minute capsules en masse, consisting essentially of a. a liquid vehicle constituting a major portion of the system by volume and forming a continuous liquid first phase, b. a second phase dispersed therein constituting a minor but significant portion of said system by volume, consisting of minute discrete liquid entities of a wall-forming solution of poly(ethylene-co-vinyl acetate) having from 38 to 55 percent of the vinyl acetate groups hydrolyzed to vinyl alcohol groups, and c. a third phase dispersed therein constituting the remainder of the system, by volume, consisting of minute discrete entities of capsule core material, the core material being wettable by said wall-forming solution and the said three phases being mutually immiscible.
Claim 7
Dependent Claim
22 words
The three-phase system of claim 7 wherein the mol percent of ethylene in the poly(ethylene-co-vinyl acetate) is about 70 to 85 percent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |