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US4785048A
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Polyurea and polyurea-epoxy microcapsules
Assignee: Moore Business Forms Inc
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Filing: 1988-02-08
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Granted: 1988-11-15
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Expires: 2008-02-08
Abstract
Abstract An improved process for the production of microcapsules by the use of hydrogen transfer polymerization in the presence of a mixture of emulsifiers including either an aqueous solution of a sodium salt of naphthalene-sulfonic acid-formaldehyde condensate or diphenyloxide disulfonate with a polyvinyl alcohol. The process is particularly useful for the production of microcapsules containing a colorless dye intermediate used in carbonless copy paper (CCP) applications.
Inventors
- 👤 Hung-Ya Chao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:06
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/165; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0866; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3228; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/249997; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A process for the production of polyurea and polyurea/epoxy microcapsules, said process comprising the steps of: a. mixing an oil-core material containing a colorless dye and a high boiling point carrier solvent with a polyisocyanate or a polyisocyanate-epoxy resin mixture; b. dispersing the resultant solution into an aqueous solution of an emulsifying mixture, said mixture comprising a first emulsifier component of a protective colloid and a second emulsifier component of a sodium salt of a napthalene sulfonic acid formaldehyde condensate or diphenyloxide disulfonate, in order to form an oil-in-water emulsion; c. adding a water-soluble polyamine into the emulsion; d. stirring the emulsion to complete the reaction.
Claim 2
Dependent Claim
106 words
A process for the production of polyurea and polyurea/epoxy microcapsules, said process comprising the steps of: a. mixing an oil-core material containing a colorless dye and a high boiling point carrier solvent with a polyisocyanate or a polyisocyanate-epoxy resin mixture; b. dispersing the resultant solution into an aqueous solution of an emulsifying mixture, said mixture comprising a first emulsifier component of a protective colloid and a second emulsifier component of a sodium salt of a napthalene sulfonic acid formaldehyde condensate or diphenyloxide disulfonate, in order to form an oil-in-water emulsion; c. adding a water-soluble polyamine into the emulsion; d. stirring the emulsion to complete the reaction.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1, wherein the ratio of said first emulsifier component to the second emulsifier component is from 40:60 to 5:95.
Claim 4
Dependent Claim
26 words
A process as claimed in claim 1, wherein after the polyamine addition (c), the emulsion is heated to a range of 25° C. to 70° C.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 3, wherein said emulsion is heated for 1 to 24 hours.
References Cited (Backward Citations)
US2712507A
Cited
US4680056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |