US4450123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing microcapsules
Assignee: Nippon Paper Industries Co Ltd
•
Filing: 1982-06-25
•
Granted: 1984-05-22
•
Expires: 2002-06-25
Abstract
Abstract In producing microcapsules using the amino resin as a capsule wall in a system in which hydrophobic core material is dispersed or emulsified in an aqueous acidic solution containing an anionic colloidal substance, said anionic colloidal substance comprises an anionic, water-soluble copolymer consisting of at least three monomers including acrylic acid, hydroxyalkylacrylate or hydroxyalkylmethacrylate and styrenesulfonic acid. The process of the present invention provides a good emulsification against the variation of the emulsifying condition, a good stability of emulsion between the encapsulating reaction, an excellent stability against the variation of the encapsulating conditions and a superior capsule slurry. More desirable results may be obtained when an anionic, water-soluble copolymer which is obtained by copolymerizing one or more components selected from alkyl acrylate, methacrylic acid, alkyl methacrylate, acrylamide, methacrylamide, succinic ester of hydroxyalkyl acrylate, succinic ester of hydroxyalkyl methacrylate, vinyl acetate and acrylonitrile as fourth and further components in addition to the above-mentioned three components, is used.
Inventors
- 👤 Setsuya Egawa
- 👤 Masahiro Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:14
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; B41; B41M; B41M5/00; B41M5/124; B41M5/165; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
83 words
Process for producing microcapsules which use an amino resin as a capsule-wall in a system in which hydrophobic core material is dispersed in an aqueous acidic solution containing an anionic colloidal substance, wherein said anionic colloidal substance comprises an anionic, water-soluble copolymer consisting of at least three monomers including acrylic acid, hydroxyalkylacrylate or hydroxyalkylmethacrylate and styrene-sulfonic acid and said anionic, water-soluble copolymer is used in amount of 2 to 10 parts by weight per 100 parts by weight of said hydrophobic core material.
Claim 2
Dependent Claim
83 words
Process for producing microcapsules which use an amino resin as a capsule-wall in a system in which hydrophobic core material is dispersed in an aqueous acidic solution containing an anionic colloidal substance, wherein said anionic colloidal substance comprises an anionic, water-soluble copolymer consisting of at least three monomers including acrylic acid, hydroxyalkylacrylate or hydroxyalkylmethacrylate and styrene-sulfonic acid and said anionic, water-soluble copolymer is used in amount of 2 to 10 parts by weight per 100 parts by weight of said hydrophobic core material.
Claim 3
Dependent Claim
12 words
Process according to claim 1, wherein said amino resin is urea/aldehyde polycondensate.
Claim 4
Dependent Claim
11 words
Process according to claim 2, wherein said urea/aldehyde polycondensate is urea/formaldehyde.
Claim 5
Dependent Claim
12 words
Process according to claim 1, wherein said amino resin is melamine/aldehyde polycondensate.
Claim 6
Dependent Claim
61 words
Process according to claim 1, wherein said anionic, water-soluble copolymer comprises at least one monomer selected from the group consisting of alkylacrylate, methacrylic acid, alkyl methacrylate, acrylamide, methacrylamide, succinic ester of hydroxyalkyl acrylate, succinic ester of hydroxyalkyl methacrylate, vinylacetate and acrylonitrile as fourth and further components in addition to said three monomers including acrylic acid, hydroxyalkylacrylate or hydroxyalkylmethacrylate and styrenesulfonic acid.
Claim 7
Dependent Claim
21 words
Process according to claim 1 or 5, wherein said anionic, wate-soluble copolymer comprises more than 50% by weight of acrylic acid.
Claim 8
Dependent Claim
44 words
Process according to claim 1 or 5, wherein said anionic, water-soluble copolymer comprises 10-95% by weight of acrylic acid, 2-50% by weight of styrenesulfonic acid, 2-30% by weight of hydroxyalkyl acrylate or hydroxyalkyl methacrylate, and 0-20% by weight of said fourth and further components.
Claim 9
Dependent Claim
16 words
Processing according to claim 7, wherein the hydroxyalkyl group of said hydroxymethacrylate includes 1-4 carbon atoms.
Claim 10
Dependent Claim
16 words
Process according to claim 7, wherein hydroxyalkyl group of said hydroxyalkyl acrylate includes 1-4 carbon atoms.
Claim 11
Dependent Claim
44 words
Process according to claim 1 or 5, wherein said anionic, water-soluble copolymer comprises 50-80% by weight of acrylic acid, 5-30% by weight of styrenesulfonic acid, 5-20% by weight of hydroxyalkyl acrylate or hydroxyalkyl methacrylate, and 1-15% by weight of said fourth and further components.
Claim 12
Dependent Claim
16 words
Process according to claim 10, wherein the hydroxyalkyl group of said hydroxymethacrylate includes 1-4 carbon atoms.
Claim 13
Dependent Claim
16 words
Process according to claim 10, wherein hydroxyalkyl group of said hydroxyalkyl acrylate includes 1-4 carbon atoms.
Claim 14
Dependent Claim
18 words
Process according to claim 1 or 5, wherein the hydroxyalkyl group of said hydroxyalkylmethacrylate includes 1-4 carbon atoms.
Claim 15
Dependent Claim
19 words
Process according to claim 1 or 5, wherein the hydroxyalkyl group of said hydroxyalkyl acrylate includes 1-4 carbon atoms.
Claim 16
Dependent Claim
44 words
Process according to claim 1 or 5, wherein said amino resin is at least one substance selected from a group consisting of methylurea/aldehyde polycondensate, dimethylolurea/aldehyde polycondensate, methyldimethylolurea/aldehyde polycondensate, melamine/aldehyde polycondensate, methylated melamine/aldehyde polycondensate, butylated melamine/aldehyde polycondensate and melamine/aldehyde polycondensate modified withphenols, benzoguanamine or urea.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |