US3855146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing microscopic capsules containing hydrophobic oil droplets therein
Assignee: Fujifilm Holdings Corp
•
Filing: 1972-02-29
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Granted: 1974-12-17
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Expires: 1992-02-29
Abstract
Abstract In a process for preparing microscopic capsules containing hydrophobic oil droplets therein comprising (1) emulsifying a water-immisicible oil in an aqueous solution of a hydrophilic colloid which is ionizable in water to obtain a first sol (2) mixing said first sol with an aqueous solution of a hydrophilic colloid which is ionizable in water and has an electric charge opposite to that of said first sol, one of said colloids being positively charged (3) adding water thereto or adjusting the pH thereof to obtain coacervates wherein complex colloids are deposited around individual oil droplets (4) cooling to gel the resulting coacervates (5) adjusting the pH thereof to 9 to 11, and (6) hardening said coacervate, the improvement comprising adding, prior to step (4), to said sol containing gelatin (a) a vinyl acetate-maleic acid copolymer, (b) a polyvinyl-benzene sulfonate or vinyl benzene sulfonate copolymer, or (c) an acrylic acid or methacrylic acid copolymer or the salts thereof, is described herein. The added compound (a), (b) or (c) is used in an amount sufficient to induce coacervation without becoming a predominant part of the main wall membrane of the microcapsules, and leads to microcapsules having a thick wall membrane and a low degree of porosity.
Inventors
- 👤 K Saeki
- 👤 H Matsukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:20
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
13 words
IN A PROCESS FOR PREPARING MICROSCOPIC CAPSULES CONTAINING HYDROPHOBIC OIL DROPLETS THEREIN COMPRISING:
Claim 2
Dependent Claim
13 words
IN A PROCESS FOR PREPARING MICROSCOPIC CAPSULES CONTAINING HYDROPHOBIC OIL DROPLETS THEREIN COMPRISING:
Claim 3
Dependent Claim
94 words
EMULSIFYING A WATER-IMMISCIBLE OIL IN AN QAUEOUS SOLUTION OF AT LEAST ONE HYDROPHILIC CCOLLOID WHICH IS IONIZABLE IN WATER TO OBTAIN A FIRST SOL, AND THEN MIXING SAID FIRST WITH AN AQUEOUS SOLUTION OF A HYDROPHILIC COLLOID WHICH IS IONIZABLE IN WATER AND HAS AN ELECTRIC CHARGE OPPOSITE THAT OF SAID FIRST SOL, ONE OF SAID SOLS BEING POSITIVELY CHRGED, OR EMULSIFYING A WATER-IMMISCIBLE OIL IN AN AQUEOUS SOLUTION OF HYDROPHILIC COLLOIDS BEING RELATIVELY NEGATIVELY WATER AND AT LEAST ONE OF WHICH IS POSITIVELY CHARGED, ONE OF THE HYDROPHILIC COLLOIDS BEING RELATIVELY NEGATIVELY CHARGED,
Claim 4
Dependent Claim
94 words
EMULSIFYING A WATER-IMMISCIBLE OIL IN AN QAUEOUS SOLUTION OF AT LEAST ONE HYDROPHILIC CCOLLOID WHICH IS IONIZABLE IN WATER TO OBTAIN A FIRST SOL, AND THEN MIXING SAID FIRST WITH AN AQUEOUS SOLUTION OF A HYDROPHILIC COLLOID WHICH IS IONIZABLE IN WATER AND HAS AN ELECTRIC CHARGE OPPOSITE THAT OF SAID FIRST SOL, ONE OF SAID SOLS BEING POSITIVELY CHRGED, OR EMULSIFYING A WATER-IMMISCIBLE OIL IN AN AQUEOUS SOLUTION OF HYDROPHILIC COLLOIDS BEING RELATIVELY NEGATIVELY WATER AND AT LEAST ONE OF WHICH IS POSITIVELY CHARGED, ONE OF THE HYDROPHILIC COLLOIDS BEING RELATIVELY NEGATIVELY CHARGED,
Claim 5
Dependent Claim
27 words
ADDING WATER THRETO, ADJUSTING PH THREOF, OR ADDING WATER THERETO AND ADJUSTING THE PH THEREOF, TO OBTAIN COACERVATES WHEREIN COMPLEX COLLOIDS ARE DEPOSITED AROUND INDIVIDUAL OIL DROPLETS,
Claim 6
Dependent Claim
27 words
ADDING WATER THRETO, ADJUSTING PH THREOF, OR ADDING WATER THERETO AND ADJUSTING THE PH THEREOF, TO OBTAIN COACERVATES WHEREIN COMPLEX COLLOIDS ARE DEPOSITED AROUND INDIVIDUAL OIL DROPLETS,
Claim 7
Dependent Claim
27 words
adding water thereto, adjusting pH thereof, or adding water thereto and adjusting the pH thereof, to obtain coacervates wherein complex colloids are deposited around individual oil droplets,
Claim 8
Dependent Claim
27 words
adding water thereto, adjusting pH thereof, or adding water thereto and adjusting the pH thereof, to obtain coacervates wherein complex colloids are deposited around individual oil droplets,
Claim 9
Dependent Claim
23 words
The process of claim 1, wherein said vinyl acetate-maleic acid copolymer has an average mOlecular weight ranging from about 5,000 to about 300,000.
Claim 10
Dependent Claim
25 words
The process of claim 1, wherein said polyvinyl benzene sulfonate or copolymer of vinylbenzene sulfonate has a molecular weight ranging from 10,000 to 3 million.
Claim 11
Dependent Claim
6 words
cooling to gel the resulting coacervates,
Claim 12
Dependent Claim
6 words
cooling to gel the resulting coacervates,
Claim 13
Dependent Claim
6 words
COOLING TO GEL THE RESULTING COACERVATES,
Claim 14
Dependent Claim
6 words
COOLING TO GEL THE RESULTING COACERVATES,
Claim 15
Dependent Claim
9 words
ADJUSTING THE PH THEREPF TO FROM 9 TO 11,AND
Claim 16
Dependent Claim
9 words
ADJUSTING THE PH THEREPF TO FROM 9 TO 11,AND
Claim 17
Dependent Claim
10 words
adjusting the pH thereof to from 9 to 11, and
Claim 18
Dependent Claim
10 words
adjusting the pH thereof to from 9 to 11, and
Claim 19
Dependent Claim
25 words
The process of claim 1, wherein said polyvinyl benzene sulfonate or copolymer of vinylbenzene sulfonate has a molecular weight ranging from 100,000 to 1 million.
Claim 20
Dependent Claim
20 words
The process of claim 1, wherein said copolymer of vinylbenzene sulfonate contains more than about 50 mole percent vinylbenzene sulfonate.
Claim 21
Dependent Claim
33 words
hardening said coacervate, the improvement comprising adding prior to step (3) a compound selected from the group consisting of (a) a vinyl acetate-maleic acid copolymer and derivatives thereof having the following repeating units:
Claim 22
Dependent Claim
33 words
hardening said coacervate, the improvement comprising adding prior to step (3) a compound selected from the group consisting of (a) a vinyl acetate-maleic acid copolymer and derivatives thereof having the following repeating units:
Claim 23
Dependent Claim
33 words
HARDENING SAID COACERVATE, THE IMPROVEMENT COMPRISING ADDING PRIOR TO STEP (3) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) A VINYL ACETATE-MALEIC ACID COPOLYMER AND DERIVATIVES THEREOF HAVING THE FOLLOWING REPEATING UNITS:
Claim 24
Dependent Claim
33 words
HARDENING SAID COACERVATE, THE IMPROVEMENT COMPRISING ADDING PRIOR TO STEP (3) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) A VINYL ACETATE-MALEIC ACID COPOLYMER AND DERIVATIVES THEREOF HAVING THE FOLLOWING REPEATING UNITS:
Claim 25
Dependent Claim
26 words
The process of claim 1, wherein said copolymer of acrylic acid or methacrylic acid has a molecular weight ranging from about 6,000 to about 2 million.
Claim 26
Dependent Claim
26 words
The process of claim 1, wherein said copolymer of acrylic acid or methacrylic acid has a molecular weight ranging from about 50,000 to about 1 million.
Claim 27
Dependent Claim
26 words
The process of claim 1, wherein said copolymer of acrylic acid or methacrylic acid contains more than about 50 mole percent acrylic acid or methacrylic acid.
Claim 28
Dependent Claim
12 words
The process of claim 1, wherein said positively charged colloid is gelatin.
Claim 29
Dependent Claim
25 words
The process of claim 9, wherein said colloid other than gelatin is selected from the group consisting of agar-agar, casein, alginate, gum arabic, and carrageein.
Claim 30
Dependent Claim
24 words
The process of claim 1, wherein said oil is selected from the group consisting of mineral oils, animal oils, vegetable oils and synthetic oils.
Claim 31
Dependent Claim
34 words
The process of claim 1, wherein said vinyl acetate-maleic acid copolymer is added at a level ranging from about one four-hundredth to one-tenth by weight to the total amount of the hydrophilic colloids present.
Claim 32
Dependent Claim
24 words
The process of claim 12, wherein said vinyl acetate-maleic acid copolymer is added at a level ranging from about one one-hundred-sixtieth to one one-hundred-thirtieth
Claim 33
Dependent Claim
38 words
The process of claim 1, wherein said polyvinyl benzene sulfonate or copolymer of vinylbenzene sulfonate is added at a level of about one one-thousandth to about one-tenth by weight to the total amount of the hydrophilic colloids present.
Claim 34
Dependent Claim
27 words
The process of claim 14, wherein said polyvinyl benzene sulfonate or copolymer of vinylbenzene sulfonate is added at a level of about one six-hundredth to about one-thirtieth.
Claim 35
Dependent Claim
37 words
The process of claim 1, wherein said copolymer of acrylic acid or methacrylic acid is added at a level of about one four-hundredth to about one-tenth by weight to the total amount of the hydrophilic colloids present.
Claim 36
Dependent Claim
26 words
The process of claim 16, wherein said copolymer of acrylic acid or methacrylic acid is added at a level of about one one-hundred-sixtieth to about one-thirtieth.
Claim 37
Dependent Claim
22 words
The process of claim 1, wherein said vinyl acetate-maleic acid copolymer is a vinyl acetate-monoethyl maleate copolymer, or a vinylacetate-monomethyl maleate copolymer.
Claim 38
Dependent Claim
19 words
The process of claim 1, wherein said alkoxyalkylacrylamide is methoxymethyl acrylamide , and wherein said morpholino-alkylacrylamide is morpholino methylacrylamide.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |