US4201404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive marking materials
Assignee: 3M Co
•
Filing: 1978-05-17
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Granted: 1980-05-06
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Expires: 1998-05-17
Abstract
Abstract Hot-melt imaging compositions useful for solventless coating on paper substrates. The imaging compositions comprise imaging microcapsules having melamine-urea-formaldehyde condensation polymer shells and an organic liquid dye precursor dispersed in a hot-melt binder. The compositions can be coated on paper substrates by conventional coating techniques to provide carbonless papers.
Inventors
- 👤 Jack W. Charbonneau
- 👤 Richard S. Law
- 👤 Willis J. Ludwig
- 👤 Wayne O. Otteson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:34
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31801; Y10T428/31804; Y10T428/31808
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
Substantially dry microcapsules comprising an organic liquid dye precursor fill enclosed by a strong impermeable shell of melamine-urea-formaldehyde condensation polymer which is substantially free of wetting agents, wherein said condensation polymer is the reaction product of a mixture comprising about 50% by weight formaldehyde, 42 to 50% by weight urea, and 2 to 8% by weight melamine, and wherein said capsules comprise a theoretical liquid fill content of between 50 and 60% by weight based on the total weight of shell and liquid fill.
Claim 2
Dependent Claim
84 words
Substantially dry microcapsules comprising an organic liquid dye precursor fill enclosed by a strong impermeable shell of melamine-urea-formaldehyde condensation polymer which is substantially free of wetting agents, wherein said condensation polymer is the reaction product of a mixture comprising about 50% by weight formaldehyde, 42 to 50% by weight urea, and 2 to 8% by weight melamine, and wherein said capsules comprise a theoretical liquid fill content of between 50 and 60% by weight based on the total weight of shell and liquid fill.
Claim 3
Dependent Claim
19 words
Microcapsules according to claim 1 wherein the average diameter of said microcapsules is between about 10 to 15 micrometers.
Claim 4
Dependent Claim
57 words
A hot-melt imaging composition useful for solventless coating on a paper substrate to provide a pressure-sensitive carbonless paper comprising about 27 to 32% by weight imaging microcapsules according to claim 1, the remainder of the composition comprising a hot-melt binder, said hot-melt binder being solid at room temperature and having a melting point below about 150° C.
Claim 5
Dependent Claim
48 words
A hot-melt composition according to claim 3 wherein said composition includes up to about 5% by weight, based on the weight of the total composition, of filler and up to about 0.5% by weight, based on the weight of the total composition, of a background color control agent.
Claim 6
Dependent Claim
13 words
A hot-melt composition according to claim 4 wherein said filler is calcium carbonate.
Claim 7
Dependent Claim
16 words
A composition according to claim 5 wherein said filler is treated with an organic titanate ester.
Claim 8
Dependent Claim
15 words
A hot-melt composition according to claim 4 wherein said background control agent is zinc rosinate.
Claim 9
Dependent Claim
15 words
A hot-melt composition according to claim 4 wherein said hot-melt binder is petroleum paraffin wax.
Claim 10
Dependent Claim
21 words
A hot-melt composition according to claim 4 wherein said imaging microcapsules have an average diameter of about 10 to 15 micrometers.
Claim 11
Dependent Claim
28 words
A carbonless paper sheet comprising a paper substrate having at least a portion of one major surface thereof coated with the hot-melt imaging composition according to claim 3.
Claim 12
Dependent Claim
56 words
A method of making a pressure-sensitive carbonless paper sheet comprising (a) providing a hot-melt composition according to claim 3, (b) heating said hot-melt composition to provide a liquid coating composition, (c) applying said coating composition to at least a portion of one surface of a paper substrate, and (d) cooling said coated substrate to room temperature.
Claim 13
Dependent Claim
11 words
A carbonless paper sheet produced by the method of claim 11.
References Cited (Backward Citations)
US3016308A
Cited
US3079351A
Cited
US3516941A
Cited
US3481759A
Cited
US3684549A
Cited
US4063754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |