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US4000087A
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US
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Microcapsules useful in carbonless copying systems and process for their preparation
Assignee: Moore Business Forms Inc
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Filing: 1974-07-29
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Granted: 1976-12-28
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Expires: 1994-07-29
Abstract
Abstract Disclosed is a process for preparing improved microcapsules which are useful in connection with carbonless copying systems. Also disclosed are the microcapsules themselves which comprise minute discrete droplets of liquid fill material including an initially colorless chemically reactive color forming dye precursor and a carrier therefor encapsulated within individual, rupturable, generally continuous polyamide shells formed thereabout. The process comprises the step of incorporating in the fill material, an amount of an epoxy resin or a polystyrene resin effective to render the microcapsules resistent to inadvertent release and transfer of the fill material.
Inventors
- 👤 George E. Maalouf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:15
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/165; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
95 words
In a process for preparing improved microcapsules which are useful in connection with carbonless copying systems and which comprise minute discrete droplets of liquid fill material including an initially colorless chemically reactive color forming dye precursor and a carrier therefor encapsulated within individual rupturable, generally continuous polyamide shells formed thereabout, the improvement of said process comprising: incorporating in said fill material, an amount of a resin effective to render said microcapsules resistant to inadvertent release and transfer of said fill material, said resin being selected from the group consisting of polystyrene resins and epoxy resins.
Claim 2
Dependent Claim
95 words
In a process for preparing improved microcapsules which are useful in connection with carbonless copying systems and which comprise minute discrete droplets of liquid fill material including an initially colorless chemically reactive color forming dye precursor and a carrier therefor encapsulated within individual rupturable, generally continuous polyamide shells formed thereabout, the improvement of said process comprising: incorporating in said fill material, an amount of a resin effective to render said microcapsules resistant to inadvertent release and transfer of said fill material, said resin being selected from the group consisting of polystyrene resins and epoxy resins.
Claim 3
Dependent Claim
15 words
A process as set forth in claim 1 wherein said resin is an epoxy resin.
Claim 4
Dependent Claim
17 words
A process as set forth in claim 2 wherein said resin is an epichlorohydrin/bisphenol A epoxy resin.
Claim 5
Dependent Claim
17 words
A process as set forth in claim 2 wherein said polyamide shells are formed by interfacial polycondensation.
Claim 6
Dependent Claim
26 words
A process as set forth in claim 4 wherein said shells are formed from a polyterephthalamide and said epoxy resin is an epichlorohydrin/bisphenol A epoxy resin.
Claim 7
Dependent Claim
21 words
A process as set forth in claim 5 wherein said polyterephthalamide is the reaction product of terephthaloyl chloride and diethylene triamine.
Claim 8
Dependent Claim
47 words
A process as set forth in claim 1 wherein said dye precursor is selected from the group consisting of Michler's hydrol, p-toluene sulfinate of Michler's hydrol, methyl ether of Michler's hydrol, benzyl ether of Michler's hydrol and a morpholine derivative of Michler's hydrol having the formula: ##STR3##
Claim 9
Dependent Claim
35 words
A process as set forth in claim 7 wherein said precursor is p-toluene sulfinate of Michler's hydrol, wherein said shells are formed from a polyterephthalamide and wherein said resin is an epichlorohydrin/bisphenol A epoxy resin.
Claim 10
Dependent Claim
23 words
A process as set forth in claim 1 wherein said carrier is dibutyl phthalate and said resin is an epichlorohydrin/bisphenol A epoxy resin.
Claim 11
Dependent Claim
23 words
A process as set forth in claim 6 wherein said precursor is p-toluene sulfinate of Michler's hydrol and said carrier is dibutyl phthalate.
Claim 12
Dependent Claim
38 words
A process as set forth in claim 1 wherein the quantity of said resin incorporated in said fill is within the range of from about 1.3 to about 13.3 weight percent based on the weight of said carrier.
Claim 13
Dependent Claim
30 words
A process as set forth in claim 11 wherein the quantity of said resin incorporated in said fill is about 6.7 weight percent based on the weight of the carrier.
Claim 14
Dependent Claim
26 words
A process as set forth in claim 3 wherein the epoxide equivalent of said resin is within the range of from about 350 to about 2500.
Claim 15
Dependent Claim
26 words
A process as set forth in claim 8 wherein the epoxide equivalent of said resin is within the range of from about 600 to about 700.
Claim 16
Dependent Claim
37 words
A process as set forth in claim 14 wherein the quantity of said resin incorporated in said fill is within the range of from about 1.3 to 13.3 weight percent based on the weight of said carrier.
Claim 17
Dependent Claim
30 words
A process as set forth in claim 15 wherein the quantity of said resin incorporated in said fill is about 6.7 weight percent based on the weight of the carrier.
Claim 18
Dependent Claim
81 words
Microcapsules which are useful in connection with carbonless copying systems comprising: minute, discrete droplets of liquid fill material including an initially colorless chemically reactive color forming dye precursor and a carrier therefor; individual, rupturable, generally continuous polyamide shells encapsulating said droplets; and an amount of a resin effective to render said microcapsules resistant to inadvertent release and transfer of said fill material incorporated in said fill material, said resin being selected from the group consisting of polystyrene resins and epoxy resins.
Claim 19
Dependent Claim
81 words
Microcapsules which are useful in connection with carbonless copying systems comprising: minute, discrete droplets of liquid fill material including an initially colorless chemically reactive color forming dye precursor and a carrier therefor; individual, rupturable, generally continuous polyamide shells encapsulating said droplets; and an amount of a resin effective to render said microcapsules resistant to inadvertent release and transfer of said fill material incorporated in said fill material, said resin being selected from the group consisting of polystyrene resins and epoxy resins.
Claim 20
Dependent Claim
14 words
Microcapsules as set forth in claim 17 wherein said resin is an epoxy resin.
Claim 21
Dependent Claim
16 words
Microcapsules as set forth in claim 18 wherein said resin is an epichlorohydrin/bisphenol A epoxy resin.
Claim 22
Dependent Claim
16 words
Microcapsules as set forth in claim 18 wherein said polyamide shells are formed by interfacial polycondensation.
Claim 23
Dependent Claim
25 words
Microcapsules as set forth in claim 20 wherein said shells are formed from a polyterephthalamide and said epoxy resin is an epichlorohydrin/bisphenol A epoxy resin.
Claim 24
Dependent Claim
20 words
Microcapsules as set forth in claim 21 wherein said polyterephthalamide is the reaction product of terephthaloyl chloride and diethylene triamine.
Claim 25
Dependent Claim
46 words
Microcapsules as set forth in claim 17 wherein said dye precursor is selected from the group consisting of Michler's hydrol, p-toluene sulfinate of Michler's hydrol, methyl ether of Michler's hydrol, benzyl ether of Michler's hydrol and a morpholine derivative of Michler's hydrol having the formula: ##STR4##
Claim 26
Dependent Claim
34 words
Microcapsules as set forth in claim 23 wherein said precursor is p-toluene sulfinate of Michler's hydrol, wherein said shells are formed from a polyterephthalamide and wherein said resin is an epichlorohydrin/bisphenol A epoxy resin.
Claim 27
Dependent Claim
22 words
Microcapsules as set forth in claim 17 wherein said carrier is dibutyl phthalate and said resin is an epichlorohydrin/bisphenol A epoxy resin.
Claim 28
Dependent Claim
22 words
Microcapsules as set forth in claim 22 wherein said precursor is p-toluene sulfinate of Michler's hydrol and said carrier is dibutyl phthalate.
Claim 29
Dependent Claim
37 words
Microcapsules as set forth in claim 17 wherein the quantity of said resin present in said fill is within the range of from about 1.3 to about 13.3 weight percent based on the weight of said carrier.
Claim 30
Dependent Claim
29 words
Microcapsules as set forth in claim 27 wherein the quantity of said resin present in the fill is about 6.7 weight percent based on the weight of said carrier.
Claim 31
Dependent Claim
25 words
Microcapsules as set forth in claim 19 wherein the epoxide equivalent of said resin is within the range of from about 350 to about 2500.
Claim 32
Dependent Claim
25 words
Microcapsules as set forth in claim 24 wherein the epoxide equivalent of said resin is within the range of from about 600 to about 700.
Claim 33
Dependent Claim
37 words
Microcapsules as set forth in claim 29 wherein the quantity of said resin present in said fill is within the range of from about 1.3 to about 13.3 weight percent based on the weight of said carrier.
Claim 34
Dependent Claim
29 words
Microcapsules as set forth in claim 30 wherein the quantity of said resin present in the fill is about 6.7 weight percent based on the weight of said carrier.
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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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |