US4525520A
Expired / Lapsed
US
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Method of preparing microcapsules
Assignee: Kanzaki Paper Manufacturing Co Ltd
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Filing: 1984-03-23
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Granted: 1985-06-25
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Expires: 2004-03-23
Abstract
Abstract In a microencapsulation process which causes hydrophobic core material containing an oil-soluble melamine-formaldehyde precondensate to emulsified in water or in a hydrophilic medium, and to form capsule wall film under conditions for promoting polycondensation, the process which is characterized in that said oil-soluble melamine-formaldehyde precondensate is 40 to 100% in a degree of formaldehyde substitution, 80 to 100% in alkylation degree, and 4 to 11 in hydrophobic degree.
Inventors
- 👤 Shunsuke Shioi
- 👤 Gensuke Matoba
- 👤 Makoto Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:14
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: 21
Claim 1
Independent Claim
69 words
In a microencapsulation process which causes hydrophobic core material containing an oil-soluble melamine-formaldehyde precondensate to be emulsified in water or in a hydrophilic medium, and to form capsule wall film under conditions for promoting polycondensation, the process which is characterized in that said oil-soluble melamine-formaldehyde precondensate is 40 to 100% in a degree of formaldehyde substitution, 80 to 100% in alkylation degree, and 4 to 11 in hydrophobic degree.
Claim 2
Dependent Claim
69 words
In a microencapsulation process which causes hydrophobic core material containing an oil-soluble melamine-formaldehyde precondensate to be emulsified in water or in a hydrophilic medium, and to form capsule wall film under conditions for promoting polycondensation, the process which is characterized in that said oil-soluble melamine-formaldehyde precondensate is 40 to 100% in a degree of formaldehyde substitution, 80 to 100% in alkylation degree, and 4 to 11 in hydrophobic degree.
Claim 3
Dependent Claim
23 words
A process as defined in claim 1 wherein the oil-soluble melamine-formaldehyde precondensate is methylated, ethylated, methyl/ethylated, methyl/propylated, methyl/butylated, ethyl/propylated or ethyl/butylated melamine-formaldehyde precondensate.
Claim 4
Dependent Claim
21 words
A process as defined in claim 2 wherein the oil-soluble melamine-formaldehyde precondensate is methylated, ethylated, methyl/ethylated, methyl/propylated or ethyl/propylated melamine-formaldehyde precondensate.
Claim 5
Dependent Claim
20 words
A process as defined in claim 1 wherein the oil-soluble melamine-formaldehyde precondensate has a hydrophobic degree of 5 to 8.
Claim 6
Dependent Claim
18 words
A process as defined in claim 1 wherein the oil-soluble melamine-formaldehyde precondensate contains hexamethoxyhexamethylolmelamine as a main component.
Claim 7
Dependent Claim
18 words
A process as defined in claim 1 wherein the oil-soluble melamine-formaldehyde precondensate contains triethoxytrimethylolmelamine as a main component.
Claim 8
Dependent Claim
39 words
A process as defined in claim 1 wherein the oil-soluble melamine-formaldehyde precondensate is used in an amount of 2 to 50 parts by weight in terms of melamine based on 100 parts by weight of the hydrophobic core material.
Claim 9
Dependent Claim
39 words
A process as defined in claim 7 wherein the oil-soluble melamine-formaldehyde precondensate is used in an amount of 4 to 30 parts by weight in terms of melamine based on 100 parts by weight of the hydrophobic core material.
Claim 10
Dependent Claim
23 words
A process as defined in claim 1 wherein the precondensation reaction is conducted at least 40° C. and at a pH below 5.5.
Claim 11
Dependent Claim
23 words
A process as defined in claim 9 wherein the precondensation reaction is conducted at least 60° C. and at a pH below 5.0.
Claim 12
Dependent Claim
23 words
A process as defined in claim 10 wherein the precondensation reaction is conducted at least 70° C. and at a pH below 4.5.
Claim 13
Dependent Claim
32 words
A process as defined in claim 1 wherein at least one compound selected from the group consisting of aldehydes, amines and phenols is contained in the water or in the hydrophilic medium.
Claim 14
Dependent Claim
28 words
A process as defined in claim 12 wherein the aldehyde is at least one compound selected from the group consisting of formaldehyde, paraformaldehyde, hexamethylenetetramine, furfural, gultaraldehyde and glyoxal.
Claim 15
Dependent Claim
18 words
A process as defined in claim 12 wherein the amine is primary or secondary monovalent or polyvalent amine.
Claim 16
Dependent Claim
27 words
A process as defined in claim 12 wherein the phenol has at least two ortho and/or para positions to hydroxyl group that are free of substitutent groups.
Claim 17
Dependent Claim
33 words
A process as defined in claim 12 wherein the aldehyde, amine or phenol is used in an amount of 0.1 to 20 moles based on one mole of melamine residue in the precondensates.
Claim 18
Dependent Claim
33 words
A process as defined in claim 16 wherein the aldehyde, amine or phenol is used in an amount of 1 to 10 moles based on one mole of melamine residue in the precondensates.
Claim 19
Dependent Claim
26 words
A process as defined in claim 1 wherein an anionic high molecular compound is contained in the water or in the hydrophilic medium as an emulsifier.
Claim 20
Dependent Claim
37 words
A process as defined in claim 18 wherein the anionic high molecular compound is at least one compound selected from the group consisting of maleic anhydride copolymers, acrylic acid, methacrylic acid and crotonic acid homopolymers and copolymers.
Claim 21
Dependent Claim
28 words
A process as defined in claim 18 wherein the emulsifier is added to the water or the hydrophilic medium in an amount of at least 0.1% by weight.
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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |