Heat-sensitive composition to protect the paper from a fake

 

(57) Abstract:

Heat-sensitive composition can be used to protect business and securities forgery. The structure contains two kinds of svetooborudovaniya enclosed in microcapsules. Microcapsules with a diameter of 3 to 6 μm is made on the basis of the melamine-formaldehyde resin, and microcapsules with a diameter of 1 to 2 μm is made on the basis maleinate production of gelatin. In addition to the microcapsules with svetooborudovaniya in the heat-sensitive composition comprises bisphenol a, zinc carbonate, a binder is sodium carboxymethyl cellulose and water. Microcapsules based on melamine-formaldehyde resin filled with a solution containing 1,3-dimethyl-6-dimethylaminopropan, 10-benzoyl-3,7-bis(dimethylamino)phenothiazines, 2-octylamine-6-diethylaminotoluene, kristallwelten (crystal violet lactone), diisopropylnaphthalene. Microcapsules based on maleinate production of gelatin filled with a solution containing 6'-nitro-1,3 .3m-trimethylspiro-[(2N'-1' benzopyran)-2,2'-indolin], castor oil technical, xylene scintillation, N, N-dimethylformamid. Thermosensitive composition increases the degree of protection paper from the fake.

The invention relates to thermocontact business and securities it can be attributed to their means of protection against forgery.

Current formulations, used as protection against forgery business and securities, based on the change in color due to physical or chemical effects, contain cocoordinating - typically, the dye in lakatoro.

Of the heat-sensitive protection paper known composition applied to the paper surface in the form of a coating, which contains a metal salt. With increasing temperature, the paper gets the color that serves as a criterion for determining its authenticity.

The disadvantage of this heat-sensitive composition is that it does not provide the necessary degree of protection paper from a fake, because such protective means it is relatively easy to reproduce, it does not exclude the possibility of falsification of the information entered into the business or securities, by erasures, etching, etc. in Addition, this composition relates to compositions of a single manifestation, while the sensing means must possess reversibility of color and high cycles.

The main objective of the invention is to increase the protection provided to the STU and complexity in relation to reproduction.

According to the invention the technical result is achieved in that the heat-sensitive composition comprising cocoordinating, further comprises bisphenol a, diphenylolpropane), zinc carbonate, sodium carboxymethyl cellulose (Na-CMC) and distilled water, and cocoordinating enclosed in microcapsules, some of which diameters 3 to 6 μm is made on the basis of the melamine-formaldehyde resin (ISF) and filled with a solution of the following composition (wt.%):

1,3-dimethyl-6-dimethylaminopropan - 0,9 - 1,2

10-benzoyl-3,7-bis(dimethylamino)phenothiazines - 0,5 - 0,7

2 octylamine-6-diethylaminocoumarin - 2,2 - 2,6

kristallwelten (crystal violet lactone) - 0,4 - 0,5

3-Diisopropylnaphthalene - 95,0 - 96,0

which has a low 100 - 110oC temperature effects and other microcapsules with a diameter of 1 to 2 μm is made on the basis maleinate derived gelatin and filled with a solution having a high temperature symptoms - 130 - 140oC (wt.%):

6'-nitro-1,3 .3m-trimethylspiro-[(2'H-1'-benzopyran)-2,2'-indolin] - 0,1 - 0,2;

Castor oil technical - 48,0 - 52,0,

Xylene scintillation - 28,0 - 32,0,

N,N-dimethylformamide - 15,8 - 23,9,

in the following ratio of components thermochemical proizvodnjo gelatin - 7,6 - 7,8,

Bisphenol - 2,8 - 3,2,

Zinc carbonate - 3,0 - 3,4,

Sodium carboxymethyl cellulose - 1,1 - 1,5,

Distilled water - 78,7 - 80,5.

The composition is a liquid-phase system (composition). It is applied to the surface of the paper over the entire area of the sheet or in the form of a graphical image (information) screen or thermal. The original color image on the paper - beige.

Under normal conditions, the shell of the microcapsules is virtually impervious to color-forming solutions. At a relatively low temperature (85 - 90oC) in the case of heat exposure on the paper melamine-formaldehyde shell is partially permeable. Enclosed in them coupler solution is gradually released, but the color is not displayed. In the region of 110 - 140oC in gelatin microcapsules by evaporation of the solvent occurs, the excess pressure under which the hot color-forming solution diffuses through the membrane, dissolves bisphenol a and interacts with it, getting a light-brown color. Tsvetoterapiya is carbonate of zinc, which is in the process of preparation of the composition deposited on the gelatin is it to dark purple. This is due to the flow tsitogeneticheskoe reaction between bisphenol a and coupler solution in microcapsular with the shell of the ISF. When re-heating a dark purple coloration structure again becomes light brown due to the discoloration of cutabrasives in microcapsules with a shell on the basis of the ISF as the result of exposure to N,N-dimethylformamide, which was freed from gelatin microcapsules together with a solution of cutabrasives. The number of cycles changes thermosensitive coloring composition during heating and cooling is from 80 to 100. When storing a sample of heat-sensitive paper, heat treated, dark violet color becomes light brown, and then becomes the original beige.

Thus, the presence of optical effects discoloration of the graphic image or other information printed on the paper proposed composition, when exposed to heat can serve as a reliable criterion for determining its (paper) authentication. The absence of effect or other options color changes indicate a fake.

For the preparation of heat-sensitive composition was prepared solutions of silver is tion, g (%):

1,3-dimethyl-6-dimethylaminopropan - 2,0 (1,1)

10-benzoyl-3,7-bis(dimethylamino)phenothiazines - 1,2 (0,6)

2 octylamine-6-diethylaminocoumarin - 4,8 (2,5)

Kristallwelten (crystal violet lactone) - 1,0 (0,5)

3-Diisopropylnaphthalene - 181,0 (95,3)

The high-temperature solution manifestations, g (%):

6'-nitro-1,3 .3m-trimethylspiro-[(2'H-1'-benzopyran)-2,2'-indolin] - 0,2 (0,1)

Castor oil technical - 96,0 (48,0)

Xylene scintillation - 56,0 (28,0)

N,N-dimethylformamide - 47,8 (23,9)

Prepared solutions were subjected to microencapsulation.

The technique of microencapsulation coupler solution of low temperature exposure.

For carrying out the process of microencapsulation were prepared solutions 1 and 2.

Solution 1, g(%).

Ammonium salt of Recoletos copolymer of butyl acrylate and methacrylic acid - 10

Water pasta Lakes 3132-VA (TU 6-01-2-674-83) - 30,0 (10,0)

The polyethylene glycol is PEG-200 - 15,0 (5,0)

Orthoboric acid to 6.0 (1,9)

Urea - 18,0 (6,0)

Distilled water - 232,0 (77,1)

This composition was heated to 90oC in a water bath with constant stirring to obtain a clear solution with pH = 8,0 - 8,5.


Sodium dihydrophosphate - 4,0 (1,5)

The mixture was heated to 60oC under stirring.

In 286 g of solution 1 was emulsiable to 136.5 g of the solution of cutabrasives low-temperature reactions on the mixer Ultra Furax" with a speed of 10,000 rpm at 65oC for 15 min to obtain a finely dispersed emulsion of the type oil-in-water (average particle diameter of the emulsion should be 25 - 30 µm). For effective mixing system was introduced nonionic surfactant OP-7 in the amount of 0.8, To the resulting emulsion with vigorous stirring was added 260 g of solution 2 (if 65oC). Resulting viscosity of the system is considerably increased. After 30 min in emulsifying the mixture was added 546 g of distilled water, continuing intensive mixing. The emulsion obtained had a pH of 3.5 - 3.7. Viscosity after adding pods decreased, which contributed to the further effective emulsification. Stirring of the mixture was continued at 60oC for 8 h, increasing pH every hour of 1.0, to obtain a dispersion of microcapsules with a neutral environment (pH = 7,0 - 7,5). Control of pH was performed using indicator paper. After this mixing precedential filtration with subsequent drying in air at room temperature.

The technique of microencapsulation coupler solution of high temperature exposure.

1024 g of 2% solution maleinate derived gelatin was added glacial acetic acid to create a pH environment 4.3 and 147 g of coupler solution at a high temperature, manifestations, and 1.1 g of surfactant - neonols P 1214-10. The mixture was emulsiable using an ultrasonic disperser of USDN-1T (intensity of the acoustic field 100 W/cm2) at 60oC for 15 minutes, the resulting emulsion was slowly cooled at room temperature to 25oC, and then quickly cooling rate of 1.5oC/min) up to 10oC. After which the dispersion was administered to 76 g of 37% aqueous formaldehyde solution, increased the pH of the medium with 10% sodium hydroxide solution (200 g) to 9.0 and kept it at room temperature 12 o'clock While the formaldehyde interacted with the amino groups of gelatin, forming transverse methylene bridges, which prevented the dissolution of the gelatin in the water. In this way received a 10% dispersion of microcapsules with a color-forming high-temperature solution manifestations.

To 100 g of the obtained dispersion was added with constant stirring 56 g of 10% solution of sodium carbonate, and cerepri room temperature for 2 hours for curing. This resulted in the stratification system in the aqueous phase and microcapsules, coated with carbonate of zinc. The aqueous phase from the microcapsules were separated by filtration. Remaining on the filter microcapsules were washed with distilled water and dried at 40oC for 1 h volumetric average diameter of the microcapsules was 2 μm.

For the preparation of heat-sensitive composition was weighed and 5.2 g of microcapsules with a solution of cutabrasives low-temperature manifestations and 7.7 g of microcapsules with a solution of cutabrasives high temperature exposure. Thereto was added 3 g of bisphenol a and 43 g of 3% aqueous solution of Na-CMC. The mixture was pereirae on disk kraskoterke to obtain a homogeneous mass, and then added 3 g of zinc carbonate, the remaining water and treated for 15 with ultrasound using pianoconcerto FG1-01 100 watts, the frequency of the acoustic field was 18 kHz to 7.5%. While heating the dispersion does not exceed 40 - 45oC.

Thus obtained heat-sensitive composition used for coating in the form of non-intersecting wavy lines on the paper by screen printing method. The original color was beige. When heated sample paper to 140oC line is evania line newly acquired light brown and again upon cooling, was a dark purple. Such cycles staining the samples withstood 95 , which confirms the high cyclicality of the heat-sensitive composition. Spectrophotometrically samples before and after testing showed that they have a stable svetotehnicheskie characteristics.

The presence of resistive effect and the nature of the change the color of the graphic images on paper can serve as a criterion for determining its authenticity.

The proposed heat-sensitive composition in comparison with the known technical solution is of high periodicity and stability svetotekhnicheskikh characteristics, provides a higher degree of protection paper from forgery, greatly complicates the ability to play when you try forgery of paper.

Sources of information:

FR, application, 2643661 A1, class D 21 H 21/46, 21/48, 1990.

Heat-sensitive composition to protect the paper from fraud, including cocoordinating, characterized in that it additionally contains bisphenol a, zinc carbonate, sodium carboxymethyl cellulose and distilled water, and cocoordinating enclosed in microcapsules, some of which with a diameter of 3-6 μm made on the basis of the melamine-formaldehyde stil-3,7-bis(dimethylamino)phenothiazines - 0,5 - 0,7

2 Octylamine-6-diethylaminocoumarin - 2,2 - 2,6

Kristallwelten (crystal violet lactone) - 0,4 - 0,5

Diisopropylnaphthalene - 95 - 96

and other microcapsules with a diameter of 1-2 μm is made on the basis maleinate derived gelatin and filled with solution, wt.%:

6'- Nitro - 1,3 .3m-trimethylspiro- [(2N' - 1' - benzopyran)-2,2'-indolin] - 0,1 - 0,2

Castor oil technical - 48 - 52

Xylene scintillation - 28 - 32

N, N-Dimethylformamide - 15,8 - 23,9

in the following ratio of the components of the heat-sensitive composition, wt. %:

Microcapsules based on melamine-formaldehyde resin - 5,0 - 5,4

Microcapsules based on maleinate derived gelatin - 7,6 - 7,8

Bisphenol - 2,8 - 3,2

Zinc carbonate - 3,0 - 3,4

Sodium carboxymethyl cellulose - 1,1 - 1,5

Distilled water - 78,7 - 80,5 Sch

 

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