US4047738A
Expired / Lapsed
US
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Record sheets sensitized with reduced charge montmorillonite pigment
Assignee: BASF Catalysts LLC
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Filing: 1976-04-05
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Granted: 1977-09-13
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Expires: 1996-04-05
Abstract
Abstract A sheet coated with a reduced charge montmorillonite pigment for use in record material, especially pressure-sensitive carbonless copying systems. The pigment is produced by replacing exchangeable cations of a substantially dioctahedral montmorillonite (exemplified by certain bentonite clays) with lithium ions, mildly heating the lithium-exchanged montmorillonite to collapse irreversibly the montmorillonite structure, and grinding the heat-treated material to pigment-size particles. The sheets produce stabilized intense images when printed with a solution of crystal violet lactone (CVL) dye precursor and thus may be used with CVL without employing secondary slow acting dyes such as benzoyl leuco methylene blue. The sheets are also useful with other colorless or substantially colorless dye precursors.
Inventors
- 👤 Peter A. H. Isaac
- 👤 T. Dixon Oulton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:45
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; B41M5/1555; C; C09; C09C; C09C1/00; C09C1/40; C09C1/42; C01; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/30; C01P2004/41; C01P2004/50; C01P2004/51; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/12; C01P2006/60; C01P2006/80; C01P2006/82; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/25; Y10T428/259
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
93 words
Record material for forming a colored image having increased resistance to fading upon contact with a solution of an electron-donating colorless or substantially colorless dye precursor compound, comprising a support member having distributed throughout a recording area thereof finely divided particles of mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been subjected to ion-exchange treatment with lithium ions followed by heat treatment to collapse irreversibly the dioctahedral montmorillonite structure.
Claim 2
Dependent Claim
93 words
Record material for forming a colored image having increased resistance to fading upon contact with a solution of an electron-donating colorless or substantially colorless dye precursor compound, comprising a support member having distributed throughout a recording area thereof finely divided particles of mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been subjected to ion-exchange treatment with lithium ions followed by heat treatment to collapse irreversibly the dioctahedral montmorillonite structure.
Claim 3
Dependent Claim
27 words
The article of claim 1 wherein said particles are essentially all finer than 15 microns and are predominantly in the size range of 1/2 to 5 microns.
Claim 4
Dependent Claim
33 words
The article of claim 1 wherein said particles contain from about 0.5% to 4% Li 2 O, based on the weight of the particles after being heated to constant weight at 1800° F.
Claim 5
Dependent Claim
17 words
The article of claim 3 wherein said particles contain from about 0.8% to 3% Li 2 O.
Claim 6
Dependent Claim
62 words
Paper coated with finely divided particles of mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, the negative charge of the dioctahedral portion of said smectite having been reduced by ion-exchange with lithium ions and the structure having been irreversibly collapsed by heat treatment.
Claim 7
Dependent Claim
62 words
Paper coated with finely divided particles of mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, the negative charge of the dioctahedral portion of said smectite having been reduced by ion-exchange with lithium ions and the structure having been irreversibly collapsed by heat treatment.
Claim 8
Dependent Claim
98 words
Paper coated with finely divided particles of mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been ion-exchanged with from about 60 to 120 meq./100 g. of lithium ions and heated at a temperature in the range of about 160° to 300° C. to collapse irreversibly the dioctahedral montmorillonite structure, said coated paper being capable of producing a stable intense blue color when contacted with a solution of crystal violet lactone in an organic solvent.
Claim 9
Dependent Claim
98 words
Paper coated with finely divided particles of mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been ion-exchanged with from about 60 to 120 meq./100 g. of lithium ions and heated at a temperature in the range of about 160° to 300° C. to collapse irreversibly the dioctahedral montmorillonite structure, said coated paper being capable of producing a stable intense blue color when contacted with a solution of crystal violet lactone in an organic solvent.
Claim 10
Independent Claim
117 words
A method for preparing a sensitized image-developing substrate for a record material system which comprises: partially exchanging exchangeable cations in a mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been ion-exchanged with lithium ions, then heated at a temperature in the range of about 160° to 300° C. to collapse irreversibly the dioctahedral montmorillonite structure and then ground until the particles are finer than 15 microns; mixing the ground material with water and a paper coating binder to form a paper coating composition; and applying said paper coating composition on a paper web.
Claim 11
Independent Claim
117 words
A method for preparing a sensitized image-developing substrate for a record material system which comprises: partially exchanging exchangeable cations in a mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been ion-exchanged with lithium ions, then heated at a temperature in the range of about 160° to 300° C. to collapse irreversibly the dioctahedral montmorillonite structure and then ground until the particles are finer than 15 microns; mixing the ground material with water and a paper coating binder to form a paper coating composition; and applying said paper coating composition on a paper web.
Claim 12
Dependent Claim
34 words
The method of claim 7 wherein said particles contain from 0.5 to 4% by weight Li 2 O based on the weight of the particles after being heated to constant weight at 1,800° F.
Claim 13
Dependent Claim
19 words
The method of claim 8 wherein said particles contain from about 0.8 to 3% by weight Li 2 O.
Claim 14
Dependent Claim
94 words
A pressure-sensitive record system comprising transfer members coated with an encapsulated solution of at least one basic colorless or substantially colorless color-forming dye precursor compound and image-developing members coated uniformly throughout a recording area thereof with a multiplicity of fluid energy milled particles of mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been subjected to ion-exchange treatment with lithium ions followed by heat treatment to collapse irreversibly dioctahedral montmorillonite structure.
Claim 15
Dependent Claim
94 words
A pressure-sensitive record system comprising transfer members coated with an encapsulated solution of at least one basic colorless or substantially colorless color-forming dye precursor compound and image-developing members coated uniformly throughout a recording area thereof with a multiplicity of fluid energy milled particles of mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been subjected to ion-exchange treatment with lithium ions followed by heat treatment to collapse irreversibly dioctahedral montmorillonite structure.
Claim 16
Dependent Claim
14 words
The record system of claim 10 wherein said dye precursor comprises crystal violet lactone.
Claim 17
Dependent Claim
15 words
The record system of claim 10 wherein crystal violet lactone is the sole dye precursor.
Claim 18
Dependent Claim
176 words
A pressure-sensitive record system comprising transfer sheets coated with an encapsulated solution of crystal violet lactone, crystal violet lactone being the sole chromogen in said record system, and image-receiving sheets coated uniformly throughout a recording area thereof with a paper coating adhesive and particles of a reactive pigment obtained from mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been ion exchanged with from about 60 to 120 meq./100 g. of lithium ions, said clay material containing no more than about 7% hydrated silica, heating the clay thus treated at a temperature in the range of 160° to 250° C. until the structure of the dioctahedral montmorillonite is collapsed, as evidenced by the fact that the product has a basal planar spacing in the range of about 9.4 to 10.7A., said particles of reactive pigment being essentially all finer than 15 microns and predominantly in the size range of 1/2 to 5 microns.
Claim 19
Dependent Claim
176 words
A pressure-sensitive record system comprising transfer sheets coated with an encapsulated solution of crystal violet lactone, crystal violet lactone being the sole chromogen in said record system, and image-receiving sheets coated uniformly throughout a recording area thereof with a paper coating adhesive and particles of a reactive pigment obtained from mixed layer smectite, the lattice of which is partially dioctahedral montmorillonite and partially trioctahedral such as saponite or hectorite, and wherein the proportion of trioctahedral is small, said mixed layer smectite having been ion exchanged with from about 60 to 120 meq./100 g. of lithium ions, said clay material containing no more than about 7% hydrated silica, heating the clay thus treated at a temperature in the range of 160° to 250° C. until the structure of the dioctahedral montmorillonite is collapsed, as evidenced by the fact that the product has a basal planar spacing in the range of about 9.4 to 10.7A., said particles of reactive pigment being essentially all finer than 15 microns and predominantly in the size range of 1/2 to 5 microns.
Claim 20
Dependent Claim
32 words
The record system of claim 13 wherein particles selected from the group consisting of calcium carbonate, kaolin and mixtures thereof are mixed with said particles of reactive pigment on said image-receiving sheets.
Claim 21
Dependent Claim
32 words
The record system of claim 10 wherein particles selected from the group consisting of calcium carbonate, kaolin and mixtures thereof are mixed with said particles of reactive pigment on said image-receiving sheets.
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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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |