US4262935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Donor material for carbonless copying and coating composition for the same
Assignee: Feldmuehle AG
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Filing: 1978-10-18
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Granted: 1981-04-21
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Expires: 1998-10-18
Abstract
Abstract A donor material for carbonless copying by contact with an acceptor material under applied pressure includes a sheet of paper or the like, and a coating on one face of the sheet. The coating consists essentially of a dye precursor, a wax solid at 20° C. and capable of dissolving the precursor, and a liquid activator soluble in the molten wax, but at most sparingly soluble in the solid wax and incapable of dissolving the dye precursor, the wax and activator being chemically inert to the dye precursor.
Inventors
- 👤 John V. Andersen
- 👤 Guido Dessauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:51
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/25; Y10T428/27; Y10T428/31504; Y10T428/31801; Y10T428/31804; Y10T428/31808
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
149 words
A donor sheet for carbonless copying consisting essentially of a substrate of sheet material and of a solid coating on one face of said substrate, said coating consisting essentially of at least one dye precursor capable of reacting PG,16 with an electron acceptor to form a colored dye, a wax, solid at 20° C. and capable of dissolving said precursor when in the molten condition, and an activator soluble in the molten wax, but at most sparingly soluble in said wax at 20° C., said activator being present in said composition in a first phase separate from a second phase including said wax and said precursor, said precursor being insoluble in said activator, said wax and said activator being chemically inert to said precursor, said coating consisting essentially of solid particles of said second phase, each particle being surrounded by a thin, substantially continuous layer of said first phase.
Claim 2
Dependent Claim
149 words
A donor sheet for carbonless copying consisting essentially of a substrate of sheet material and of a solid coating on one face of said substrate, said coating consisting essentially of at least one dye precursor capable of reacting PG,16 with an electron acceptor to form a colored dye, a wax, solid at 20° C. and capable of dissolving said precursor when in the molten condition, and an activator soluble in the molten wax, but at most sparingly soluble in said wax at 20° C., said activator being present in said composition in a first phase separate from a second phase including said wax and said precursor, said precursor being insoluble in said activator, said wax and said activator being chemically inert to said precursor, said coating consisting essentially of solid particles of said second phase, each particle being surrounded by a thin, substantially continuous layer of said first phase.
Claim 3
Dependent Claim
35 words
The donor sheet of claim 1 wherein said activator consists of at least one member of the group consisting of mineral oil, fixed oils of vegetable and animal organisms, dibutyl phthalate, ethyleneglycol and liquid polyethyleneglycol.
Claim 4
Dependent Claim
42 words
The donor sheet of claim 1 or 2 wherein said wax consists predominantly of at least one member of the group consisting of microcrystalline paraffin wax, carnauba wax, ester wax, amide wax, m-terphenyl wax, polyvinyl octadecyl ether wax, and chlorinated paraffin wax.
Claim 5
Dependent Claim
29 words
The donor sheet of claim 3 wherein said wax further includes at least one member of the group consisting of paraffin having a branched chain, ozokerite, and petrolatum wax.
Claim 6
Dependent Claim
17 words
The donor sheet of claim 1 further comprising at least one pulverulent filler inert to said precursor.
Claim 7
Dependent Claim
28 words
The donor sheet of claim 5 wherein said at least one filler is a member of the group consisting of calcium carbonate, urea formaldehyde resin, starch, and talcum.
Claim 8
Dependent Claim
17 words
The donor sheet of claim 1 wherein said at least one dye precursor is crystal violet lactone.
Claim 9
Dependent Claim
24 words
The donor sheet of claim 7 wherein the coating contains benzoylleukomethylene blue in an amount smaller than the amount of said crystal violet lactone.
Claim 10
Dependent Claim
54 words
The donor sheet of claim 7 or 8 wherein said activator consists of paraffinic mineral oil, and said wax is a first mixture of ozokerite and carnauba wax, or a second mixture of ester wax, paraffin wax, and amide wax, or a third mixture of ester wax, polyvinyl octadecyl ether wax, and amide wax.
Claim 11
Dependent Claim
39 words
The donor sheet of claim 1 wherein said at least one dye precursor consists predominantly of p-toluene-sulfonate of Michler's hydrol, said wax is a mixture of microcrystalline paraffin and ester wax, and said activator is a paraffinic mineral oil.
Claim 12
Dependent Claim
32 words
The donor sheet of claim 1 wherein said activator amounts to 35% to 85% of the weight of said wax, and said dye precursor amounts to 2% to 15% of said weight.
Claim 13
Dependent Claim
25 words
The donor sheet of claim 11 further including an inert, pulverulent, inorganic filler an amount of 20% to 80% of the weight of said wax.
Claim 14
Dependent Claim
25 words
A donor sheet as set forth in claim 1, wherein said coating amounts to 2 to 12 grams per square meter of said one face.
Claim 15
Dependent Claim
15 words
A donor sheet as set forth in claim 1, wherein said sheet material is paper.
Claim 16
Dependent Claim
73 words
A set of carbonless copying material comprising a donor sheet as set forth in claim 1 and an acceptor sheet juxtaposed to said donor sheet, said acceptor sheet including said electron acceptor contiguously adjacent said coating in an amount sufficient for reacting with said dye precursor and producing a visible amount of said dye when a portion of said first phase is transferred to said acceptor sheet by pressure applied to said set.
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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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |