US2085675A - Safety paper and method of making same - Google Patents
Safety paper and method of making same Download PDFInfo
- Publication number
- US2085675A US2085675A US4872A US487235A US2085675A US 2085675 A US2085675 A US 2085675A US 4872 A US4872 A US 4872A US 487235 A US487235 A US 487235A US 2085675 A US2085675 A US 2085675A
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- US
- United States
- Prior art keywords
- paper
- safety
- chemical
- naphthylamine
- safety paper
- 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
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- 238000004519 manufacturing process Methods 0.000 title description 10
- 239000000126 substance Substances 0.000 description 40
- 150000005002 naphthylamines Chemical class 0.000 description 21
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 15
- 150000003839 salts Chemical class 0.000 description 15
- 230000002378 acidificating effect Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- XQVWYOYUZDUNRW-UHFFFAOYSA-N N-Phenyl-1-naphthylamine Chemical compound C=1C=CC2=CC=CC=C2C=1NC1=CC=CC=C1 XQVWYOYUZDUNRW-UHFFFAOYSA-N 0.000 description 9
- 239000004215 Carbon black (E152) Substances 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 239000002904 solvent Substances 0.000 description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 5
- UJCPPXOIDSEILU-UHFFFAOYSA-N 1-naphthalen-1-yl-1-phenylhydrazine Chemical compound C=1C=CC2=CC=CC=C2C=1N(N)C1=CC=CC=C1 UJCPPXOIDSEILU-UHFFFAOYSA-N 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-N sulfonic acid Chemical compound OS(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-N 0.000 description 4
- 125000001931 aliphatic group Chemical group 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 239000007844 bleaching agent Substances 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
- RUFPHBVGCFYCNW-UHFFFAOYSA-N 1-naphthylamine Chemical compound C1=CC=C2C(N)=CC=CC2=C1 RUFPHBVGCFYCNW-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 150000001242 acetic acid derivatives Chemical class 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N alpha-methyl toluene Natural products CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 125000000623 heterocyclic group Chemical group 0.000 description 2
- 150000002430 hydrocarbons Chemical group 0.000 description 2
- 150000003840 hydrochlorides Chemical class 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 125000001624 naphthyl group Chemical group 0.000 description 2
- 150000003891 oxalate salts Chemical class 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- JBIJLHTVPXGSAM-UHFFFAOYSA-N 2-naphthylamine Chemical class C1=CC=CC2=CC(N)=CC=C21 JBIJLHTVPXGSAM-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- KEQFTVQCIQJIQW-UHFFFAOYSA-N N-Phenyl-2-naphthylamine Chemical compound C=1C=C2C=CC=CC2=CC=1NC1=CC=CC=C1 KEQFTVQCIQJIQW-UHFFFAOYSA-N 0.000 description 1
- CIUQDSCDWFSTQR-UHFFFAOYSA-N [C]1=CC=CC=C1 Chemical compound [C]1=CC=CC=C1 CIUQDSCDWFSTQR-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- -1 alkali metal salts Chemical class 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000001725 pyrenyl group Chemical group 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 125000005493 quinolyl group Chemical group 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
- D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
- D21H21/46—Elements suited for chemical verification or impeding chemical tampering, e.g. by use of eradicators
Definitions
- This invention relates to safety paper including fraud preventing. writing material made of .paper or other substance or composition adapted for the printing or lithographing or for the inscription of writing or other mark or legend thereon and for use for example in the manufacture of checks, drafts, bonds, stock certificates or other instruments which it is desired to have protected against fraudulent, alteration
- This invention relates primarily to safety paper having incorporated therein by impregnation or superficial application either continuously or locally a chemical compound which is adapted upon application of a chemical ink eradicator the safety paper by the use of a chemical ink eradicator.
- substantially colorless compounds adapt"-- ed to exhibit a decided color development when treated ,with a chemical ink eradicator.
- mono-nitrogen substituted naphthylamine it is meant that one only of the hydrogen atoms in the amino group has been replaced by an allphatic, heterocyclic or aromatic substituent.
- One'R radical is the radical NH:
- the NH2 group becomes the group aliphatic, aromatic, or heterocyclic X being any 1 that a hydrogen atom of the hydrocarbon radical is replaced by an acidic radical such'as SOzH (sulphonic); NO: (nitro); COOH (carboxyl), or
- OH (hydroxyl) radical may be included in the acidic group.
- "I'h8 salts of such acidic derivatives are'the salts of alkali metals e. g. sodium and potassium and other salt forming alkaline earth and heavy metals.
- the term salt also includesorganic salts or esters such as methyl, ethyl, phenyl, etc.
- basic derivative it is understood that a hydrogen atom of the hydrocarbon radical is replaced by a basic radical such as NHa (amino).
- NHa amino
- These basic derivatives form ammonium type salts such as the sulphates, hydrochlorides, acetates, oxalates, and t e like.
- the R radicals other than the radical may be not only hydrogen but also an aliphatic, aromatic or heterocyclic substituent as above defined.
- the mono-nitrogen substituted naphthylamines which may be used in the practice of this invention may include more radical in mono-nitrogen substituted naphthylamines may be an acidic; radical or a salt thereof or a basic radical or a salt thereof as above described only in such case the radical or radicals are attached directly to one or more carbon atoms of the naphthyl nucleus instead of to a carbon atom of a hydrocarbon substituent.
- Mono-nitrogen substituted naphthylamines as referred to herein, include salts thereof such as the sulphates, hydrochlorides, oxalates, acetates and the like which salts may likewise be employed in the practice 'of this invention.
- R R wherein one R radical is X being any aliphatic, aromatic, or heterocyclic substituent.
- X is'a hydrocarbon radical and of the hydrocarbon radicals aromatic and heterocyclic radicals are'further to be preferred.
- the remaining R radicals be any radical selected from the group consisting of x as above defined, hydrogen, hydrocarbon radicals, acidic derivatives of hydrocarbon radicals, salts of said acidic derivatives, basic derivatives of said hydrocarbon radicals, salts of said basic derivatives, acidic radicals, salts of ,said acidic radicals, basic radicals, and salts of said basic radicals.
- the mono-nitrogen substituted naphthylamines which may be employed in the practice of this invention also includes salts formed with the basic
- the hydrocarbon radicals may be radicals such as methyl, ethyl,
- alkali metal salts e. a. sodium or potas slum of acidic derivatives are preferred where water solubility isdesired.
- the preparation of safety paper embodying this invention can be practiced in several ways.
- the naphthylamines above mentioned which areinsoluble in water may be incorporated in safety paper by mixing the same with the paper fibre during the beating operation which forms a. step in the paper; making process.
- the chemical may be added in the form of a dry powder, for example, as the chemicals above mentioned are very stable and will not be altered during the beating operation or during the subsequent steps of the paper making process.
- the chemical compoundln such case is carried down into the finished paper so that when attempt is made to alter a legend on the paper by using a. chemical ink eradicator such as a bleach, the paper will develop a pronounced color which affords a warning indicia.
- the safety chemical may be dis- .5 solved in a suitable solvent therefor.
- solvents such as acetone, ethyl alcohol, benzene and the like or mixtures thereof.
- a solution of the safety chemical may be applied in any suitable manner as by dipping, spraying, etc. The concentration of the solution is preferably such that about 2% to 10% ofrthe chemical on the weight of the paper will beretained after the solvent has been evaporated from the paper.
- water solu ble naphthylamine derivative water may be used as a solvent.
- the safety chemicals by the methods above described or by any other method of i pregnation or surface application, can be impregn ted in the body of the safety paper or may be applied to the surface thereof and while it is preferable to have all parts of the safety paper react similarly to chemical ink eradicators due to the uniform distribution of the safety chemical therein, the
- safety chemical can be applied locally as by printing or other suitable method.
- safety paper carrying a safety chemical herein described is to be'regarded as having any 'such 3 safety chemical incorporated therein. It will be understood that this invention is applicable among other fields of application in' connection with-plain white paper as well as tinted paper Patent No. 2,085,675.
- a safety paper having incorporated therein a mono-nitrogen substituted naphthylamine.
- a safety paper having incorporated therein Nphenyl-naphthylamine.
- a safety paper having incorporated therein N phenyl naphthylamine sulphonic acid.
- a safety paper having incorporated therein N phenyl amino naphthylamine.
- a method of making safety paper which comprises incorporating in paper N-phenyl naphthylamine.
- a method of making safety paper which comprises incorporating in paper N-phenyl naphthylamine sulphonic acid.
- a method of making safety paper which comprises incorporating in paper N-phenyl amino naphthylamine.
- a method of making comprises incorporating in paper a mono-nitrogen substituted naphthylamine.
- safety paper which ice] in safety paper, the more intense will be the color that is developed when a chemical bleaching material is applied to the safety paper.
- the safety chemical may be dis- .5 solved in a suitable solvent therefor.
- solvents such as acetone, ethyl alcohol, benzene and the like or mixtures thereof.
- a solution of the safety chemical may be applied in any suitable manner as by dipping, spraying, etc. The concentration of the solution is preferably such that about 2% to 10% ofrthe chemical on the weight of the paper will beretained after the solvent has been evaporated from the paper.
- water solu ble naphthylamine derivative water may be used as a solvent.
- the safety chemicals by the methods above described or by any other method of i pregnation or surface application, can be impregn ted in the body of the safety paper or may be applied to the surface thereof and while it is preferable to have all parts of the safety paper react similarly to chemical ink eradicators due to the uniform distribution of the safety chemical therein, the
- safety chemical can be applied locally as by printing or other suitable method.
- safety paper carrying a safety chemical herein described is to be'regarded as having any 'such 3 safety chemical incorporated therein. It will be understood that this invention is applicable among other fields of application in' connection with-plain white paper as well as tinted paper Patent No. 2,085,675.
- a safety paper having incorporated therein a mono-nitrogen substituted naphthylamine.
- a safety paper having incorporated therein Nphenyl-naphthylamine.
- a safety paper having incorporated therein N phenyl naphthylamine sulphonic acid.
- a safety paper having incorporated therein N phenyl amino naphthylamine.
- a method of making safety paper which comprises incorporating in paper N-phenyl naphthylamine.
- a method of making safety paper which comprises incorporating in paper N-phenyl naphthylamine sulphonic acid.
- a method of making safety paper which comprises incorporating in paper N-phenyl amino naphthylamine.
- a method of making comprises incorporating in paper a mono-nitrogen substituted naphthylamine.
Description
and methods of making such safety paper.
Patented June 29, 1937 ,.SAFETY PAPER. AND
ration of New Jersey' No Drawing.
This invention relates to safety paper including fraud preventing. writing material made of .paper or other substance or composition adapted for the printing or lithographing or for the inscription of writing or other mark or legend thereon and for use for example in the manufacture of checks, drafts, bonds, stock certificates or other instruments which it is desired to have protected against fraudulent, alteration This invention relates primarily to safety paper having incorporated therein by impregnation or superficial application either continuously or locally a chemical compound which is adapted upon application of a chemical ink eradicator the safety paper by the use of a chemical ink eradicator.
It is the purpose of this invention to'aiford chemicals which when incorporated in safety paper develop disfiguring stains of a particularly vivid and permanent character upon the application of a chemical ink eradicator thereto. It is a further purpose of this invention to aiford a chemical which when incorporated in safety paper does not discolor undesirably on aging due to premature development of color as the result of such causes as exposure to air and/or to light.
I have found that protection of a very desirable type can be afl'orded in safety paper by incorporating therein a mono-nitrogen substituted naphthylamine. Such compounds when incorporated in safety paper and treated with a bleach type of ink eradicator such as the ink eradicators extensively used at the present time containing hypochlorite solution or bleaching powder adapted to give up free chlorine, have beeniound to develop colors which are very vivid and give a very pronounced indication that attempt has been made to alter the safety paper. The colors so developed are likewise of a relatively permanent character as they are resistant to acids and alkalis and to reducing agents. Likewise such chemical compounds have been found to be highly stable on aging, that is, they do not tend to change color upon standing and/or exposure to light. Moreover, many of such substances are substantially colorless, that is, they do not tend to impart noticeable color to safety paper in which they are incorporated in proportions desirable for developing'warning color indicia in the "safety paper upon the application color.
METHOD or MAKING AME Francis L. Simons, Needham, Mass, assignor to George La Monte & Son, Nutley, N. J., a corpo- Application February 4. 1935 Serial No. 4,872
sclaims. (01. 91-6195) of a chemical ink eradicator thereto.- In this connection it may be stated that development of color includes change from a colorless substance to' a colored substance, intensification of color or change from one color to another color.
.In the usual case the materials mentioned above change from a substantially colorless state or very slightly colored state to a very pronounced Normally it is regarded as preferable to employ substantially colorless compounds adapt"-- ed to exhibit a decided color development when treated ,with a chemical ink eradicator.
By mono-nitrogen substituted naphthylamine it is meant that one only of the hydrogen atoms in the amino group has been replaced by an allphatic, heterocyclic or aromatic substituent.
The formulae for naphthylamine may be written in either of the following ways, namely,
A more condensed formula covering both the alpha and beta naphthylamines may be written as follows: 7
wherein One'R radical is the radical NH: and
the remaining R radicals are hydrogen. The alpha '(or) and beta (5) positions have been indicated in the general formula and it is apparent that the NIH group'can occupy either an a or 5 position. x
In mono-nitrogen substituted 'naphthylamines the NH2 group becomes the group aliphatic, aromatic, or heterocyclic X being any 1 that a hydrogen atom of the hydrocarbon radical is replaced by an acidic radical such'as SOzH (sulphonic); NO: (nitro); COOH (carboxyl), or
a Cl, Br or I (halogen); For the purposes herein set forth the OH (hydroxyl) radical may be included in the acidic group. "I'h8 salts of such acidic derivatives are'the salts of alkali metals e. g. sodium and potassium and other salt forming alkaline earth and heavy metals. The term salt also includesorganic salts or esters such as methyl, ethyl, phenyl, etc. By basic derivative it is understood that a hydrogen atom of the hydrocarbon radical is replaced by a basic radical such as NHa (amino). These basic derivatives form ammonium type salts such as the sulphates, hydrochlorides, acetates, oxalates, and t e like.
In mono-nitrogen substituted naph hyJamines which may be used according to. this invention,
the R radicals other than the radical may be not only hydrogen but also an aliphatic, aromatic or heterocyclic substituent as above defined. Moreover, the mono-nitrogen substituted naphthylamines which may be used in the practice of this invention may include more radical in mono-nitrogen substituted naphthylamines may be an acidic; radical or a salt thereof or a basic radical or a salt thereof as above described only in such case the radical or radicals are attached directly to one or more carbon atoms of the naphthyl nucleus instead of to a carbon atom of a hydrocarbon substituent.
Mono-nitrogen substituted naphthylamines as referred to herein, include salts thereof such as the sulphates, hydrochlorides, oxalates, acetates and the like which salts may likewise be employed in the practice 'of this invention.
Certain mono-nitrogeh-substituted naphthylamines which are preferably employed in the practice of this invention may be indicated by the formula R R wherein one R radical is X being any aliphatic, aromatic, or heterocyclic substituent. Preferably X is'a hydrocarbon radical and of the hydrocarbon radicals aromatic and heterocyclic radicals are'further to be preferred. It is likewise preferable that the remaining R radicals be any radical selected from the group consisting of x as above defined, hydrogen, hydrocarbon radicals, acidic derivatives of hydrocarbon radicals, salts of said acidic derivatives, basic derivatives of said hydrocarbon radicals, salts of said basic derivatives, acidic radicals, salts of ,said acidic radicals, basic radicals, and salts of said basic radicals. As above mentioned, the mono-nitrogen substituted naphthylamines which may be employed in the practice of this invention also includes salts formed with the basic In the foregoing description the hydrocarbon radicals may be radicals such as methyl, ethyl,
propyl, etc., as well as aromatic radicals such as phenyl, naphthyl, tolyl, etc. and heterocyclic radicals .are pyridyl, pyryl, quinolyl, etc. It is not regarded as necessary to list the names of substituted naphthylamines having such radicals. In the case of the phenyl radical, for example, as contained in mono-nitrogen substituted naphthylamine the name of the compound is.N-phenyl-alpha naphthylamine or N-phenylbeta-naphthylamine, the N symbol indicating that the phenyl is attached to the N atom of the naphthylamine. The same applies in applying nomenclature to substituted naphthylamines containing other radicals above mentioned.
Referring to acidic substituents and acidic derivatives of hydrocarbon substituents the sulphonic and carboxyl derivatives are preferred.
Also the alkali metal salts e. a. sodium or potas slum of acidic derivatives are preferred where water solubility isdesired.
The preparation of safety paper embodying this invention can be practiced in several ways. The naphthylamines above mentioned which areinsoluble in water may be incorporated in safety paper by mixing the same with the paper fibre during the beating operation which forms a. step in the paper; making process. The chemical may be added in the form of a dry powder, for example, as the chemicals above mentioned are very stable and will not be altered during the beating operation or during the subsequent steps of the paper making process. The chemical compoundln such case is carried down into the finished paper so that when attempt is made to alter a legend on the paper by using a. chemical ink eradicator such as a bleach, the paper will develop a pronounced color which affords a warning indicia. In the case of the N-phenyl-naphthylamines, and other naphthylamines of an analogous character about 2% to 10% of the chemical on the dry weight of the paper may be used. Of course, greater or lesser amounts can be used, depending on the amount of color developed by the application of a chemical ink eradicator to the substance selected and the intensity of color that is desired in the warning stain. Normally, the greater the amount of safety chemice] in safety paper, the more intense will be the color that is developed when a chemical bleaching material is applied to the safety paper.
Alternately, the safety chemical may be dis- .5 solved in a suitable solvent therefor. Thus many of the. mono nitrogen substituted naphthylamines above mentioned are soluble in solvents, such as acetone, ethyl alcohol, benzene and the like or mixtures thereof. A solution of the safety chemical may be applied in any suitable manner as by dipping, spraying, etc. The concentration of the solution is preferably such that about 2% to 10% ofrthe chemical on the weight of the paper will beretained after the solvent has been evaporated from the paper. When a water solu ble naphthylamine derivative is used water may be used as a solvent. The safety chemicals by the methods above described or by any other method of i pregnation or surface application, can be impregn ted in the body of the safety paper or may be applied to the surface thereof and while it is preferable to have all parts of the safety paper react similarly to chemical ink eradicators due to the uniform distribution of the safety chemical therein, the
safety chemical can be applied locally as by printing or other suitable method. In any event, safety paper carrying a safety chemical herein described is to be'regarded as having any 'such 3 safety chemical incorporated therein. It will be understood that this invention is applicable among other fields of application in' connection with-plain white paper as well as tinted paper Patent No. 2,085,675.
. FRANCIS L. SIMONS Certificate of Correction or paperhaving surface markings thereon. It is likewise applicable when a tint in the paper is delible under the action of chemical ink eradicators and/or when the surface marking or tinting is removable by mechanical erasure. Y
While this invention has been described in connection with certain specific examples thereof, it is to be understood that this has been done merely for the purpose of illustration and that the scope 'of this invention is to be governed by the following claims.
I claim:
- 1. A safety paper having incorporated therein a mono-nitrogen substituted naphthylamine.
2. A safety paper having incorporated therein Nphenyl-naphthylamine.
3. A safety paper having incorporated therein N phenyl naphthylamine sulphonic acid.
4. A safety paper having incorporated therein N phenyl amino naphthylamine.
5. A method of making safety paper which comprises incorporating in paper N-phenyl naphthylamine.
6. A method of making safety paper which comprises incorporating in paper N-phenyl naphthylamine sulphonic acid.
7. A method of making safety paper which comprises incorporating in paper N-phenyl amino naphthylamine.
8. A method of making comprises incorporating in paper a mono-nitrogen substituted naphthylamine. I
FRANCIS L. SIMONS.
June 29, 1937.
It is hereby certified that error appears in the v I v printed specification of the above numbered patent reqmr ng correction as follows: Page 2, first column, line 45, for the formula v H I 9/2 x read: I
and that the said Letters Patentsh ould be read 'th I I ereln' I same may conform to the record of the case in th Patent ill i bi th that. the
and sealed this 1stv day of M'arch, A. D. 1938.
HENRY vAN ARSDALE, d'mg Commissioner of Patents.
safety paper which ice] in safety paper, the more intense will be the color that is developed when a chemical bleaching material is applied to the safety paper.
Alternately, the safety chemical may be dis- .5 solved in a suitable solvent therefor. Thus many of the. mono nitrogen substituted naphthylamines above mentioned are soluble in solvents, such as acetone, ethyl alcohol, benzene and the like or mixtures thereof. A solution of the safety chemical may be applied in any suitable manner as by dipping, spraying, etc. The concentration of the solution is preferably such that about 2% to 10% ofrthe chemical on the weight of the paper will beretained after the solvent has been evaporated from the paper. When a water solu ble naphthylamine derivative is used water may be used as a solvent. The safety chemicals by the methods above described or by any other method of i pregnation or surface application, can be impregn ted in the body of the safety paper or may be applied to the surface thereof and while it is preferable to have all parts of the safety paper react similarly to chemical ink eradicators due to the uniform distribution of the safety chemical therein, the
safety chemical can be applied locally as by printing or other suitable method. In any event, safety paper carrying a safety chemical herein described is to be'regarded as having any 'such 3 safety chemical incorporated therein. It will be understood that this invention is applicable among other fields of application in' connection with-plain white paper as well as tinted paper Patent No. 2,085,675.
. FRANCIS L. SIMONS Certificate of Correction or paperhaving surface markings thereon. It is likewise applicable when a tint in the paper is delible under the action of chemical ink eradicators and/or when the surface marking or tinting is removable by mechanical erasure. Y
While this invention has been described in connection with certain specific examples thereof, it is to be understood that this has been done merely for the purpose of illustration and that the scope 'of this invention is to be governed by the following claims.
I claim:
- 1. A safety paper having incorporated therein a mono-nitrogen substituted naphthylamine.
2. A safety paper having incorporated therein Nphenyl-naphthylamine.
3. A safety paper having incorporated therein N phenyl naphthylamine sulphonic acid.
4. A safety paper having incorporated therein N phenyl amino naphthylamine.
5. A method of making safety paper which comprises incorporating in paper N-phenyl naphthylamine.
6. A method of making safety paper which comprises incorporating in paper N-phenyl naphthylamine sulphonic acid.
7. A method of making safety paper which comprises incorporating in paper N-phenyl amino naphthylamine.
8. A method of making comprises incorporating in paper a mono-nitrogen substituted naphthylamine. I
FRANCIS L. SIMONS.
June 29, 1937.
It is hereby certified that error appears in the v I v printed specification of the above numbered patent reqmr ng correction as follows: Page 2, first column, line 45, for the formula v H I 9/2 x read: I
and that the said Letters Patentsh ould be read 'th I I ereln' I same may conform to the record of the case in th Patent ill i bi th that. the
and sealed this 1stv day of M'arch, A. D. 1938.
HENRY vAN ARSDALE, d'mg Commissioner of Patents.
safety paper which
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4872A US2085675A (en) | 1935-02-04 | 1935-02-04 | Safety paper and method of making same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4872A US2085675A (en) | 1935-02-04 | 1935-02-04 | Safety paper and method of making same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2085675A true US2085675A (en) | 1937-06-29 |
Family
ID=21712931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US4872A Expired - Lifetime US2085675A (en) | 1935-02-04 | 1935-02-04 | Safety paper and method of making same |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2085675A (en) |
-
1935
- 1935-02-04 US US4872A patent/US2085675A/en not_active Expired - Lifetime
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