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US5011885A
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US
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Methods for the production of microcapsules using functionalized isocyanate
Assignee: TMC GROUP Inc
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Filing: 1989-10-27
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Granted: 1991-04-30
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Expires: 2009-10-27
Abstract
Abstract The present invention is directed to a method for preparing microcapsules which comprises: preparing an aqueous dispersion or emulsion of a hydrophobic oily core material containing a polyvalent isocyanate, a polyvalent isothiocyanate, or an adduct thereof, having an anionic moiety; and forming capsule walls around the droplets of said oily core material.
Inventors
- 👤 Jing-Den Chen
- 👤 Kerry Kovacs
- 👤 Margaret T. Thomas
- 👤 Rong-Chang Liang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/54; C08G18/544; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; B01J13/20; B01J13/22; C08G18/08; C08G18/0804; C08G18/0819; C08G18/70; C08G18/72; C08G18/77; C08G18/775; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
64 words
A method for preparing microcapsules which comprises: preparing an aqueous dispersion or emulsion of a hydrophobic oily core material containing a polyvalent isocyanate, a polyvalent isothiocyanate, or an adduct containing at least one of said polyvalent isocyanate and said polyvalent isothiocyanate, said polyvalent isocyanate and said polyvalent isothiocyanate having an anionic moiety; and forming capsule walls around the droplets of said oily core material.
Claim 2
Independent Claim
64 words
A method for preparing microcapsules which comprises: preparing an aqueous dispersion or emulsion of a hydrophobic oily core material containing a polyvalent isocyanate, a polyvalent isothiocyanate, or an adduct containing at least one of said polyvalent isocyanate and said polyvalent isothiocyanate, said polyvalent isocyanate and said polyvalent isothiocyanate having an anionic moiety; and forming capsule walls around the droplets of said oily core material.
Claim 3
Dependent Claim
43 words
The method of claim 1 wherein said anionic moiety is a moiety containing a group selected from the class consisting of OSO 3 --, OPO 3 --2 , COO--, SO 2 O--, S 2 O 3 --, POO-- and PO 3 --2 .
Claim 4
Dependent Claim
29 words
The method of claim 2 wherein said oily core material contains a sulfonated polyvalent isocyanate, a sulfonated polyvalent isothiocyanate, or a sulfonated adduct of a polyvalent isocyanate or isothiocyanate.
Claim 5
Dependent Claim
26 words
The method of claim 2 wherein said oily core material contains an adduct of a polyvalent isocyanate or a polyvalent isothiocyanate and a sulfonated polyhydric compound.
Claim 6
Dependent Claim
22 words
The method of claim 4 wherein said sulfonated polyhydric compound is a sulfonated dicarboxylic acid, a sulfonated diol or a sulfonated diamine.
Claim 7
Dependent Claim
13 words
The method of claim 5 wherein said sulfonated polyhydric compound is 4-sulfophthalic acid.
Claim 8
Dependent Claim
8 words
Microcapsules prepared by the process of claim 1.
Claim 9
Independent Claim
64 words
A method for forming microcapsules which comprises: forming an emulsion or aqueous dispersion of an oily core material containing a polyvalent isocyanate, a polyvalent isothiocyanate, or an adduct containing at least one of said polyvalent isocyanate and said polyvalent isothiocyanate, said polyvalent isocyanate nad said polyvalent isothiocyanate having an anionic moiety, and enwrapping particles of said oily core material in an amine-formaldehyde condensation product.
Claim 10
Independent Claim
64 words
A method for forming microcapsules which comprises: forming an emulsion or aqueous dispersion of an oily core material containing a polyvalent isocyanate, a polyvalent isothiocyanate, or an adduct containing at least one of said polyvalent isocyanate and said polyvalent isothiocyanate, said polyvalent isocyanate nad said polyvalent isothiocyanate having an anionic moiety, and enwrapping particles of said oily core material in an amine-formaldehyde condensation product.
Claim 11
Dependent Claim
42 words
The method of claim 8 wherein said anionic moiety is a moiety containing a group selected from the class consisting of OSO 3 --, OPO 3 --2 , COO--, SO 2 O--, S 2 O 3 --, POO--and PO 3 --2 .
Claim 12
Dependent Claim
15 words
The method of claim 9 wherein said amine-formaldehyde condensation product is a melamine-formaldehyde condensation product.
Claim 13
Dependent Claim
29 words
The method of claim 10 wherein said oily core material contains a sulfonated polyvalent isocyanate, a sulfonated polyvalent isothiocyanate, or a sulfonated adduct of a polyvalent isocyanate or isothiocyanate.
Claim 14
Dependent Claim
26 words
The method of claim 10 wherein said oily core material contains an adduct of a polyvalent isocyanate or a polyvalent isothiocyanate and a sulfonated polyhydric compound.
Claim 15
Dependent Claim
21 words
The method of claim 12 wherein said sulfonated polyhydric compound is sulfonated dicarboxylic acid, a sulfonated diol or a sulfonated diamine.
Claim 16
Dependent Claim
13 words
The method of claim 13 wherein said sulfonated polyhydric compound is 4-sulfophthalic acid.
Claim 17
Dependent Claim
16 words
The method of claim 10 wherein said continuous aqueous phase contains a water soluble anionic polymer.
Claim 18
Dependent Claim
20 words
The method of claim 14 wherein said anionic polymer is a homopolymer or a copolymer of vinyl benzene sulfonic acid.
Claim 19
Dependent Claim
21 words
The method of claim 16 wherein said oily core material contains an adduct of a biuret of HDI and 4-sulfophthalic acid.
Claim 20
Dependent Claim
28 words
A pressure-sensitive or photosensitive recording sheet comprising a support having a layer of microcapsules on the surface thereof, said microcapsules being prepared by the process of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |