US3755190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capsule manufacture
Assignee: NCR Voyix Corp
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Filing: 1971-11-09
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Granted: 1973-08-28
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Expires: 1991-11-09
Abstract
Abstract A process is disclosed for performing encapsulation, en masse, by an in situ polymerization reaction of polyhydroxy phenolic materials with aldehyde materials. The polyhydroxy phenolic material is provided, for reaction in the system, as a watersoluble complex combined with a highly hydrolyzed form of poly(vinyl alcohol). Liquid-liquid phase separation is accomplished and maintained by increase in the molecular weight of the phenolic/aldehyde reaction product without use of any phase-separation-inducing materials. The poly(vinyl alcohol) serves a dual purpose of controlling the polyhydroxy phenolic/aldehyde polymerization reaction and acting as a sort of toughening additive for the completed capsule wall material.
Inventors
- 👤 R Hart
- 👤 D Emrick
- 👤 R Bayless
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:34
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2989
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
15 words
The process of claim 1 wherein the poly(vinyl alcohol) is more than 96 percent hydrolyzed.
Claim 2
Dependent Claim
26 words
The process of claim 1 wherein the polyhydroxy phenolic material is selected from the group consisting of catechol, gallic acid, 4-hexylresorcinol, pyrogallol, Resorcinol, and tannic acid.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the polyhydroxy phenolic material is selected from the group consisting of resorcinol and catechol.
Claim 4
Dependent Claim
131 words
A process for manufacturing minute capsules, en masse, comprising the steps of: a. establishing an agitating single-phase aqueous solution system of aldehydic material selected from the group consisting of formaldehyde, furfural, glutaraldehyde and glyoxal and a complex combination of poly(vinyl alcohol) and water-soluble polyhydroxy phenolic material having at least two phenolic hydroxy groups; b. dispersing into the system particles of an intended capsule core material substantially in-soluble in the system; c. continuing agitation of the system to accomplish i. polymerization reaction between the aldehydic material and the polyhydroxy phenolic material ii. liquid-liquid phase separation of the polymerization reaction product to wet and enwrap the dispersed particles of intended capsule core material as capsule wall material and iii. further polymerization reaction to solidify the capsule wall material and render it completely insoluble.
Claim 5
Dependent Claim
15 words
The process of claim 5 wherein the poly(vinyl alcohol) is more than 96 percent hydrolyzed.
Claim 6
Dependent Claim
26 words
The process of claim 5 wherein the polyhydroxy phenolic material is selected from the group consisting of catechol, gallic acid, 4-hexylresorcinol, pyrogallol, resorcinol, and tannic acid.
Claim 7
Dependent Claim
20 words
The process of claim 5 wherein the polyhydroxy phenolic material is selected from the group consisting of resorcinol and catechol.
Claim 8
Dependent Claim
146 words
A process for manufacturing minute capsules, en masse, comprising the steps of: a. establishing an agitating single-phase, aqueous, solution system of substantially hydrolyzed poly(vinyl alcohol) b. dissolving in the aqueous system i. polyhydroxy phenolic material having at least two phenolic hydroxy groups ii. aldehydic material selected from the group consisting of formaldehyde, furfural, glutaraldehyde, and glyoxal, the polyhydroxy phenolic material yielding a dissolved complex with the poly(vinyl alcohol) and the aldehydic material reacting with the polyhydroxy phenolic material to yield a liquid-liquid-phase-separated polymerization product c. dispersing in the system particles of an intended capsule core material substantially insoluble in the system and substantially unreactive with the components of the system, the dispersed particles being wet and enwrapped by the liquid, phase separated, polymerization product d. continuing agitation of the system to further polymerize the polyhydroxy phenolic material into solid capsule wall material insoluble in the system.
Claim 9
Dependent Claim
15 words
The process of claim 9 wherein the poly(vinyl alcohol) is more than 96 percent hydrolyzed.
Claim 10
Dependent Claim
26 words
The process of claim 9 wherein the polyhydroxy phenolic material is selected from the group consisting of catechol, gallic acid, 4-hexylresorcinol, pyrogallol, resorcinol, and tannic acid.
Claim 11
Dependent Claim
20 words
The process of claim 9 wherein the polyhydroxy phenolic material is selected from the group consisting of resorcinol and catechol.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |