US3915731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous composition containing color former for pressure-sensitive production
Assignee: Mizusawa Industrial Chemicals Ltd
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Filing: 1973-01-24
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Granted: 1975-10-28
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Expires: 1993-01-24
Abstract
Abstract An aqueous composition containing a color former for pressure sensitive recording paper having good primary and secondary color-developing abilities and an excellent smoothening property, said composition comprising a dispersion of fine particles of a clay mineral of the montmorillonite group, a clay mineral of the kaplinite-group halloysite type, or an acid-treated product thereof in an aqueous medium containing a water-miscible organic solvent in an amount not exceeding 30% by weight, said composition having a water-affinity coefficient (Kw), defined in the specification, of 1.3 to 3, and a method for producing the aqueous composition. This aqueous composition, when coated on a receiving sheet or an intermediate sheet of the recording paper, provides smooth and lustrous surface and has a reduced tendency to cause wear or damage to printing types or cutting blades when printing or cutting the sheet.
Inventors
- 👤 Yujiro Sugahara
- 👤 Tadahisa Nakazawa
- 👤 Kouichi Usui
- 👤 Masahide Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:19
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/42; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; B41M5/1555; C01B33/26; C01B33/40; C01B33/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
246 words
AN AQUEOUS COMPOSITION CONTAINING A COLOR DEVELOPER FOR PRESSURE-SENSITIVE RECORDING PAPER HAVING EXCELLENT SMOOTHNESS, SAID COMPOSITION COMPRISING A DISPERSION OF 5-40% BY WEIGHT FINE PARTICLES OF AN ACID-TREATED CLAY MINERAL OF THE MONTMORILLONITE GROUP IN AN AQUEOUS MEDIUM CONTAINING 030% BY WEIGHT OF A WATER-MISCIBLE ORGANIC SOLVENT, AT LAST 20% BY WEIGHT OF SAID PARTICLES HAVING A PARTICLE DIAMETER OF NOT MORE THAN 1 MICRON AND SAID COMPOSITION HAVING A WATERAFFINITY COEFFICIENT (KW), DEFINED BELOW, OF 1,3 TO 3: KW = (W1 - W2)/(W2 - W1 X (5.85 X 10**-2 X (AX)/5)) WHEREIN W1 IS THE WEIGHT IN GRAMS OF A PRECIPITATED PORTION OF A SAMPLE OF REMAINING IN A CENTRIFUNGAL PRECIPITATION TUBE WHEN 5 G OF THE SAMPLE OF SAID AQUEOUS COMPSITION CONTAINING SAID ACID-TREATED CLAY MINERAL IN A CONCENTRATION OF 10% BY WEIGHT WHOSE PH HAS BEEN ADJUSTED TO 2 ($0.5) WITH AN AQUEOUS SOLUTION OF HYDROCHORIC ACID OR SODIUM HYDROXIDE IS TAKEN INTO SAID CENTRIFUGAL PRECIPITATION TUBE AND ROATED BY A CENTRIFUGAL SEPARATOR FOR 10 MINUTES WITH A CENTRIFUGATION EFFECT OF 800G, AND THE RESULTING SUPERANTANT LIQUID IS SEPARATED, W2 IS THE WEIGHT IN GRAMS OF A SOLID OBTAINING BY DRYING SAD PRECIPITATED PORTION AT 500*C, TO AN EQUILIBRIUM MOISTURE CONTENT, A IS THE NORMALITY OF SAID AQUEOUS SOLUTION OF HYDROCHLORIC ACID OR SODIUM HYDROXIDE USED TO ADJUST THE PH OF SAID AQUEOUS COMPOSITION TO 2 ($0.5), X IS THE AMOUNT IN MILLITITERS OF SAID AQUEOUS SOLUTION OF HYDROCHLORIC ACID OR SODIUM HYDROXIDE.
Claim 2
Dependent Claim
246 words
AN AQUEOUS COMPOSITION CONTAINING A COLOR DEVELOPER FOR PRESSURE-SENSITIVE RECORDING PAPER HAVING EXCELLENT SMOOTHNESS, SAID COMPOSITION COMPRISING A DISPERSION OF 5-40% BY WEIGHT FINE PARTICLES OF AN ACID-TREATED CLAY MINERAL OF THE MONTMORILLONITE GROUP IN AN AQUEOUS MEDIUM CONTAINING 030% BY WEIGHT OF A WATER-MISCIBLE ORGANIC SOLVENT, AT LAST 20% BY WEIGHT OF SAID PARTICLES HAVING A PARTICLE DIAMETER OF NOT MORE THAN 1 MICRON AND SAID COMPOSITION HAVING A WATERAFFINITY COEFFICIENT (KW), DEFINED BELOW, OF 1,3 TO 3: KW = (W1 - W2)/(W2 - W1 X (5.85 X 10**-2 X (AX)/5)) WHEREIN W1 IS THE WEIGHT IN GRAMS OF A PRECIPITATED PORTION OF A SAMPLE OF REMAINING IN A CENTRIFUNGAL PRECIPITATION TUBE WHEN 5 G OF THE SAMPLE OF SAID AQUEOUS COMPSITION CONTAINING SAID ACID-TREATED CLAY MINERAL IN A CONCENTRATION OF 10% BY WEIGHT WHOSE PH HAS BEEN ADJUSTED TO 2 ($0.5) WITH AN AQUEOUS SOLUTION OF HYDROCHORIC ACID OR SODIUM HYDROXIDE IS TAKEN INTO SAID CENTRIFUGAL PRECIPITATION TUBE AND ROATED BY A CENTRIFUGAL SEPARATOR FOR 10 MINUTES WITH A CENTRIFUGATION EFFECT OF 800G, AND THE RESULTING SUPERANTANT LIQUID IS SEPARATED, W2 IS THE WEIGHT IN GRAMS OF A SOLID OBTAINING BY DRYING SAD PRECIPITATED PORTION AT 500*C, TO AN EQUILIBRIUM MOISTURE CONTENT, A IS THE NORMALITY OF SAID AQUEOUS SOLUTION OF HYDROCHLORIC ACID OR SODIUM HYDROXIDE USED TO ADJUST THE PH OF SAID AQUEOUS COMPOSITION TO 2 ($0.5), X IS THE AMOUNT IN MILLITITERS OF SAID AQUEOUS SOLUTION OF HYDROCHLORIC ACID OR SODIUM HYDROXIDE.
Claim 3
Dependent Claim
37 words
The aqueous composition of claim 1 which has a water-affinity coefficient of 1.5 to 2.7, with the proviso that it has a pH of 2 and the concentration of said clay mineral is 10 % by weight.
Claim 4
Dependent Claim
25 words
The aqueous composition of claim 1 wherein the concentration of the water-miscible organic solvent in the aqueous medium does not exceed 15 % by weight.
Claim 5
Independent Claim
138 words
A method for producing an aqueous composition containing a color developer for pressure-sensitive recording paper having excellent smoothness, which comprises drying an acid-treated clay mineral of the montmorillonite group at a temperature not exceeding 650*C., then pulverizing or stirring it in a liquid medium comprising water, an organic solvent or a mixture of these, adjusting said liquid medium to an aqueous medium containing 0 - 30 % by weight of a water-miscible organic solvent when said aqueous medium is not used as said liquid medium to form a dispersion of finely divided particles of said clay mineral, at least 20% of said particles having a particle diameter of not more than one micron, and adjusting the water-affinity coefficient as defined by the following equation of said aqueous composition to not less than 1.3 but not more than 3:
Claim 6
Independent Claim
138 words
A method for producing an aqueous composition containing a color developer for pressure-sensitive recording paper having excellent smoothness, which comprises drying an acid-treated clay mineral of the montmorillonite group at a temperature not exceeding 650*C., then pulverizing or stirring it in a liquid medium comprising water, an organic solvent or a mixture of these, adjusting said liquid medium to an aqueous medium containing 0 - 30 % by weight of a water-miscible organic solvent when said aqueous medium is not used as said liquid medium to form a dispersion of finely divided particles of said clay mineral, at least 20% of said particles having a particle diameter of not more than one micron, and adjusting the water-affinity coefficient as defined by the following equation of said aqueous composition to not less than 1.3 but not more than 3:
Claim 7
Dependent Claim
46 words
The method of claim 4 wherein clay mineral is dried at a temperature not exceeding 650*C., dry pulverized, and then pulverized in an aqueous medium containing 0 - 30% by weight of a water-miscible organic solvent, thereby to adjust the water-affinity coefficient to 1.3 - 3.
Claim 8
Dependent Claim
80 words
The method of claim 4 wherein said clay mineral is dried at a temperature not exceeding 650*C., dry pulverized, and pulverized in a polar organic solvent or an aqueous solution of said polar organic solvent containing the solvent in an amount in excess of 30 % by weight, and then the concentration of the polar organic solvent in the medium is adjusted to not more than 30 % by weight, thereby to adjust the water-affinity coefficient to 1.3 - 3.
Claim 9
Dependent Claim
60 words
The method of claim 4 wherein said clay mineral is dried at a temperature not exceeding 650*C., dry pulverized, and pulverized in a non-polar organic solvent, and then the non-polar organic solvent is replaced by an aqueous medium containing 0 - 30 % by weight of a polar organic solvent, thereby to adjust the water-affinity coefficient to 1.3 - 3.
Claim 10
Dependent Claim
27 words
The method of claim 4 wherein said pulverization is carried out so that the water-affinity coefficient of said aqueous composition reaches a range of 1.4 - 2.7.
Claim 11
Dependent Claim
23 words
The method of claim 4 including the step of dry pulverizing said clay mineral prior to pulverizing or stirring in said liquid medium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |