US2695245A - Process of recording by decoloring - Google Patents
Process of recording by decoloring Download PDFInfo
- Publication number
- US2695245A US2695245A US139323A US13932350A US2695245A US 2695245 A US2695245 A US 2695245A US 139323 A US139323 A US 139323A US 13932350 A US13932350 A US 13932350A US 2695245 A US2695245 A US 2695245A
- Authority
- US
- United States
- Prior art keywords
- decoloring
- color
- paper
- crystal violet
- colored
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
- B41M5/128—Desensitisers; Compositions for fault correction, detection or identification of the layers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S101/00—Printing
- Y10S101/29—Printing involving a color-forming phenomenon
Definitions
- This invention relates to a process of recording by decoloring, and more particularly pertains to such a process in which, in a first step, the whole recording area of a base record material is colored by bringing together thereon two substances reactant on contact to produce a distinctive color and, in a second step, recordings are made on said area with a decoloring fluid.
- the data so recorded stands out as light areas against a dark colored background.
- the process uses the phenomenon of adsorption and desorption of two reactive materials which normally are colorless in the .unadsorbed state, but which produce a color on adsorption, one upon the other.
- the color is produced through an electron donor-acceptor chemical reaction, without any ion exchange.
- a non-color reactant adsorbate which is preferentially adsorbed on the adsorbent, the color-producing agLgrbate is desorbed with loss of color.
- the invention is not deemed to be limited to the particular coloring and decoloring agents to be described in the preferred and modified forms of the invention as the principle is capable of being caried out with other coloring agents and decoloring agents of which persons skilled in the art will be fully aware.
- the means of applying the decoloring fluid in a recording operation also is a matter of choice, whether it be done by letterpress type, planographic printing plates, porous type, writing stylus, or pen.
- the base record material white paper
- the base record material has the recording area thereof coated with a binder film containing solid particles of adsorbent material which acts as an acid and thereby causes a distinctive color in a coloring material which is applied thereto as the first step of the process.
- the color is produced by an electron donor-acceptor adsorption color reaction, which is reversible by desorption.
- the preferred coloring material is crystal violet lactone, which is 3,3 bis (p-dimethylaminophenyl) 6-dirnethylamino phthalide, having the structure and which may be prepared in the manner disclosed in United States Patent No. Re. 23,024, which was granted originally on the application of Clyde S. Adams.
- This compound which normally exists as white crystals, is changed to a deep violet-blue when in adsorption contact with solid particles of an adsorbent solid compound which acts as an acid relative thereto.
- the adsorbent material preferred for use in the base paper sheet with crystal violet lactone is the natural clay-like material atta pulgite.
- the attapulgite is applied to the paper by means of a starch binder or equivalent as commonly practiced in the paper coating art. The needle-shaped particles of attapulgite insure that parts of some are exposed without coverage by the starch so the applied fluid coloring material may be adsorbed thereon.
- One method of applying attapulgite to paper is to cook twenty per cent, by weight, of paper coating starch in water for fifteen minutes at 200 Fahrenheit and, after cooling, adding to one part, by weight, of the cooked starch four parts, by weight, of a dispersion of one part, by weight, of attapulgite in three parts, by weight, of water.
- the mixture is applied to paper at room temperature so as to leave a dried coating .0005 of an inch in thickness.
- the crystal violet lactone To facilitate the application of the crystal violet lactone to the coated paper, it is dissolved in toluene, a 3% solution, being sufficient.
- the toluene solution is applied to the attapulgite coated paper which immediately turns dark violet-blue due to the adsorption of the crystal violet lactone on the attapulgite particles.
- the colored paper is then dried and is ready for the second step of the process.
- the decoloring fluid contains a compound which displaces the crystal violet lactone adsorbed on the clay whereupon the crystal violet lactone resumes its natural white or colorless state.
- the decoloring agent is chosen so the displacement of the crystal violet lactone is permanent.
- water and ethyl alcohol are temporary-decoloring agents, through preferential adsorption, but their action is fleeting because, as evaporation occurs, the crystal violet lactone resumes its adsorption contact with the clay and again becomes colored.
- the preferred decoloring agent is stearyl trimethylammonium chloride which may be dissolved in ethyl alcohol for application to the colored paper.
- This decoloring agent has the general formula R being the group C18H37.
- Many other compounds of the same general structure may be used, among which may be mentioned di-coco-dimethylammonium chloride, which is a mixture of di-lauryl-dimethylammonium chloride and di-myristyl-dimethylammonium chloride.
- the alcohol rapidly evaporates leaving the printed characters permanently white as the decoloring agent does not evaporate.
- An oily solvent may be used as the vehicle in which the decoloring agent is applied, if desired.
- the use of an oily vehicle is indicated in the event the decoloring fluid is subjected to an evaporating environrnent for long periods prior to application to the record material, such precluding the use of a volatile vehicle such as ethyl alcohol.
- the fluid vehicle is a matter of choice, as it plays no permanent part in the decoloring process.
- the paper may be originally colored by a contrasting dye not aifected by the decoloring agent used.
- a suitable contrasting dye is Sudan Red and may be mixed directly with the toluene solution of crystal violet lactone.
- the paper so prepared is very dark purplish-blue and when recorded upon by the decoloring agent the recorded data appears red against the dark-blue background.
- I(gthler contrasting dyes may be used in place of Sudan
- a blue color is given by the normally white or colorless Michlers hydrol, having the structure and the normally white or colorless methyl ether of Michlers hydrol, having the structure And a bright blue color is produced by the normally w(ll1ite or colorless 3,3 bis (p-methylaminophenyl) phtha- 1i c.
- the invention is not limited to a base web of paper as any base material that may be colored and printed or written upon may be used.
- a process of recording data including the steps of providing a base web sheet; sensitizing the sheet by applying to it particles of attapulgite, the particles being applied so as to be held by the sheet so as to be substantially exposed to contact by an applied liquid; applying to the intended record area of the sheet 3,3 bis(p-dimethylaminophenyl)-6-dimet hylamino phthalide carried in a liquid, which will turn the intended record area to a dis tinctive color; drying the sheet; and lastly applying to the colored portion of the sheet, as by printing type, stearyl trimethylammonium chloride carried in a liquid to decolor the printed area.
Landscapes
- Paper (AREA)
- Color Printing (AREA)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE500662D BE500662A (de) | 1950-01-18 | ||
US139323A US2695245A (en) | 1950-01-18 | 1950-01-18 | Process of recording by decoloring |
DEN3330A DE855406C (de) | 1950-01-18 | 1951-01-06 | Verfahren zum Herstellen von Aufzeichnungen |
CH292825D CH292825A (fr) | 1950-01-18 | 1951-01-13 | Procédé pour l'obtention d'inscriptions ou de motifs sur un matériel. |
GB1032/51A GB700109A (en) | 1950-01-18 | 1951-01-15 | Method of producing visual indications on record material |
FR1031089D FR1031089A (fr) | 1950-01-18 | 1951-01-17 | Procédé d'enregistrement de données sur un matériau d'enregistrement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US139323A US2695245A (en) | 1950-01-18 | 1950-01-18 | Process of recording by decoloring |
Publications (1)
Publication Number | Publication Date |
---|---|
US2695245A true US2695245A (en) | 1954-11-23 |
Family
ID=22486101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US139323A Expired - Lifetime US2695245A (en) | 1950-01-18 | 1950-01-18 | Process of recording by decoloring |
Country Status (6)
Country | Link |
---|---|
US (1) | US2695245A (de) |
BE (1) | BE500662A (de) |
CH (1) | CH292825A (de) |
DE (1) | DE855406C (de) |
FR (1) | FR1031089A (de) |
GB (1) | GB700109A (de) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2777780A (en) * | 1954-11-09 | 1957-01-15 | Ncr Co | Method of desensitizing clay-coated record sheet |
DE1036278B (de) * | 1954-02-03 | 1958-08-14 | Du Pont | Vervielfaeltigungsverfahren, bei dem der Farbstoff erst nach oder bei dem Vervielfaeltigen entwickelt wird |
US3079271A (en) * | 1959-07-22 | 1963-02-26 | Allied Chem | Pressure sensitive sheet record material and method of making |
US3364052A (en) * | 1965-02-17 | 1968-01-16 | Frank D. Martino | Method for desensitizing sensitized record sheets and resultant article |
US3414423A (en) * | 1965-11-04 | 1968-12-03 | Eastman Kodak Co | Process for erasing and regenerating thermographic materials |
US4199618A (en) * | 1975-09-02 | 1980-04-22 | Champion International Corporation | Hidden entry system |
USRE30797E (en) * | 1977-11-09 | 1981-11-17 | Scott Paper Company | Associated dye salts and method of forming colored indicia therewith |
USRE30803E (en) * | 1977-11-09 | 1981-11-24 | Scott Paper Company | Colorless recording paper |
EP0395006A2 (de) * | 1989-04-28 | 1990-10-31 | Sony Corporation | Zusammensetzung für eine Anzeigevorrichtung, Farbstoff und Aufzeichnungsmaterial |
US5179065A (en) * | 1989-04-28 | 1993-01-12 | Sony Corporation | Recording material with a display composition including a coloring pigment |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54115907A (en) * | 1977-12-02 | 1979-09-08 | Barry Graham Charles | Thin sheet printed with transparent ink* and developer eraser for said ink |
NL1029806C2 (nl) | 2005-08-25 | 2007-02-27 | Reich Benelux Office | Aandrijfrol en hulpaandrijving voorzien van een dergelijke aandrijfrol. |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1971683A (en) * | 1930-04-19 | 1934-08-28 | Nat Aniline & Chem Co Inc | Colored coal and process of producing the same |
US2208288A (en) * | 1938-07-11 | 1940-07-16 | Robert N Cook | Ink for writing on blueprints |
US2331575A (en) * | 1940-08-03 | 1943-10-12 | George La Monte & Son | Safety paper and method of making same |
US2484019A (en) * | 1945-08-06 | 1949-10-11 | Devores Edward | Process for correcting negatives |
US2505481A (en) * | 1944-01-31 | 1950-04-25 | Ncr Co | Process of making pressure sensitive record material |
US2550468A (en) * | 1948-07-13 | 1951-04-24 | Ncr Co | Manifold record material and process for making it |
-
0
- BE BE500662D patent/BE500662A/xx unknown
-
1950
- 1950-01-18 US US139323A patent/US2695245A/en not_active Expired - Lifetime
-
1951
- 1951-01-06 DE DEN3330A patent/DE855406C/de not_active Expired
- 1951-01-13 CH CH292825D patent/CH292825A/fr unknown
- 1951-01-15 GB GB1032/51A patent/GB700109A/en not_active Expired
- 1951-01-17 FR FR1031089D patent/FR1031089A/fr not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1971683A (en) * | 1930-04-19 | 1934-08-28 | Nat Aniline & Chem Co Inc | Colored coal and process of producing the same |
US2208288A (en) * | 1938-07-11 | 1940-07-16 | Robert N Cook | Ink for writing on blueprints |
US2331575A (en) * | 1940-08-03 | 1943-10-12 | George La Monte & Son | Safety paper and method of making same |
US2505481A (en) * | 1944-01-31 | 1950-04-25 | Ncr Co | Process of making pressure sensitive record material |
US2484019A (en) * | 1945-08-06 | 1949-10-11 | Devores Edward | Process for correcting negatives |
US2550468A (en) * | 1948-07-13 | 1951-04-24 | Ncr Co | Manifold record material and process for making it |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1036278B (de) * | 1954-02-03 | 1958-08-14 | Du Pont | Vervielfaeltigungsverfahren, bei dem der Farbstoff erst nach oder bei dem Vervielfaeltigen entwickelt wird |
US2777780A (en) * | 1954-11-09 | 1957-01-15 | Ncr Co | Method of desensitizing clay-coated record sheet |
US3079271A (en) * | 1959-07-22 | 1963-02-26 | Allied Chem | Pressure sensitive sheet record material and method of making |
US3364052A (en) * | 1965-02-17 | 1968-01-16 | Frank D. Martino | Method for desensitizing sensitized record sheets and resultant article |
US3414423A (en) * | 1965-11-04 | 1968-12-03 | Eastman Kodak Co | Process for erasing and regenerating thermographic materials |
US4199618A (en) * | 1975-09-02 | 1980-04-22 | Champion International Corporation | Hidden entry system |
USRE30797E (en) * | 1977-11-09 | 1981-11-17 | Scott Paper Company | Associated dye salts and method of forming colored indicia therewith |
USRE30803E (en) * | 1977-11-09 | 1981-11-24 | Scott Paper Company | Colorless recording paper |
EP0395006A2 (de) * | 1989-04-28 | 1990-10-31 | Sony Corporation | Zusammensetzung für eine Anzeigevorrichtung, Farbstoff und Aufzeichnungsmaterial |
EP0395006A3 (de) * | 1989-04-28 | 1991-07-31 | Sony Corporation | Zusammensetzung für eine Anzeigevorrichtung, Farbstoff und Aufzeichnungsmaterial |
US5160371A (en) * | 1989-04-28 | 1992-11-03 | Sony Corporation | Display composition, coloring pigment, and recording material |
US5179065A (en) * | 1989-04-28 | 1993-01-12 | Sony Corporation | Recording material with a display composition including a coloring pigment |
Also Published As
Publication number | Publication date |
---|---|
FR1031089A (fr) | 1953-06-19 |
GB700109A (en) | 1953-11-25 |
CH292825A (fr) | 1953-08-31 |
BE500662A (de) | |
DE855406C (de) | 1952-11-13 |
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