The paper is protected from tampering and unauthorized production

 

(57) Abstract:

The paper is intended for protection against counterfeiting and unauthorized manufacture due to the use of protective equipment, whose actions are based on changing the appearance of staining when exposed to the heat. The paper contains a thermosensitive coating and fat-soluble dye with a particle size of 7 to 10 μm, dispersed in the paper pulp. Dermocosmetology floor consists of distributed in the binder is gelatin microcapsules d = 1.0 to 1.5 μm, 0.15 - to 0.30 wt.%. a solution of fat-soluble dye in a mixture of castor oil, xylene and dimethylformamide. On the shells of the microcapsules precipitated stearic acid. Increased degree of security paper in respect of unauthorised production and falsification of information content.

The invention relates to the production of paper containing various means of protection against counterfeiting and unauthorized manufacture, and more particularly to securities with protective means, the action of which is based on the phenomenon of thermal sensitivity, i.e., changing the appearance of color when exposed to heat.

Main area of use of the invention - production the Ana as a recording material for recording information by using a thermal head.

Known securities, consisting of a base paper coated with a mixture of color-forming dye in lakatoro, filler (e.g., chalk) and a binder (starch, latex). Thus svetoprestavlenie carry out a stamp with a mixture of dark colors and reagent acidic nature of the formation around the dark colorful print colored halo /1/. The process is due to the chemical interaction of color-forming dye and reagent acidic character.

The closest technical solution is similar paper, protected from tampering and unauthorized manufacture, consisting of a base paper and a coating containing the metal salt, which when heated changes its color /2/.

The disadvantages of this paper include ease of detection of protective equipment and its ease of play when possible forgery. This does not prevent the possibility of fraud by cleaning, etching, etc. of the information contained on the paper.

The main objective of the invention is to increase the degree of security paper with a thermosensitive coating not only in respect of unauthorised production, but also in relation to FA is isenau against counterfeiting and unauthorized production, consisting of a base paper and heat-sensitive color-forming coating according to the invention, the base paper contains dispersed in the paper pulp fat-soluble dye with a particle size of 7 to 10 μm, and heat-sensitive color-forming coating consists of distributed in the binder is gelatin microcapsules with a diameter of 1.0 to 1.5 μm with 0,15 - 0,30% solution of fat-soluble dye in a mixture of castor oil, xylene and dimethylformamide, in the membranes which precipitated stearic acid. Stearic acid in the first stage, plays the role of a masking agent coloring microcapsules, and then provides the uniformity of the colour of the background paper. The size of dispersed particles of fat-soluble dye was justified by the necessity of its concealment in the paper. In the case of using the solution of fat-soluble dye with a concentration of less than 0.15, and more 0,30% of the difference between the manifest and the unmanifest areas of color saturation is reduced, i.e. the effect of thermal sensitivity of the paper is waning.

Under thermal influence (either locally or over the entire area) on a paper sheet in the area 69 - 70oC is the melting of stearic acid, found on the shells of the microcapsules. At the same time the AET diffusion of the dye solution through the membrane. In the region of 130 - 140oC shell dissolved, droplets of the solution are mixed with the melt of stearic acid, merge with each other and are evenly distributed on the surface of the paper, staining it, creating a common background color. Simultaneously present in the paper dimethylformamide, xylene and castor oil affect the dispersed particles of fat-soluble dye, which manifest in the form of brightly colored dots all over the field.

Thus, heat-sensitive paper protection is reflected in the education of the colored background and intensely colored individual dots of heat (130 - 140oC). In the case where only solvent, for example, when trying etching, erasures for the purpose of fraud contained in the paper information, i.e., forgery, are only brightly colored dispersed particles of the dye, and the total colored background when it is not formed.

Information confirming the possibility of carrying out the invention.

Paper-based, protected from partial and complete forgery by giving it thermal sensitivity, cast on a laboratory paper machine, prokleivanie saponified gum rosin, gelatin is, The paper was stained blue acid (Briliahtalixarinwelkblau BL, "Sabdox", Color Index C. I> 61585, Acid blue 80) and direct (direct pure blue, Direct blue 1, C. I. 24410) dyes. During low tide in the pulp was introduced in dispersed form of fat-soluble blue phtalocyanine dye (New Zapon blue (IG), Solvent Dye, C. I. 74420) with an average particle size of 8 μm. The finished paper was applied thermosensitive composition containing in g (%):

microcapsules with 0.2% solution phthalocyaninato dye Grasoleht Briliant Blau 2GLN, C. I. Sol. Bl. 48 - 5,8 (5,8)

stearic acid - 4,8 (4,8)

sodium carboxymethyl cellulose (Na-CMC) - 0,84 (0,8)

distilled water - 88,76 (88,6)

The choice of Na-CMC as a binder justifies its high thermal stability (temperature darkening 227oC) in combination with transparency. Pre-mix was pereirae on krakatit and was diluted with water to obtain a dispersion with a viscosity of 14 seconds (B3-4). Heat-sensitive coating on paper inflicted by passing the paper web through the bath with dispersion. After this paper was dried in a stream of air infrared lamps for 15 min and was Kalandarishvili. The average coating thickness was 10 μm.

The microcapsule for heat-sensitive coating has been islote to create a pH environment 4.3 and 147 wt.h. 0.2% solution of fat-soluble phthalocyaninato dye Grasoleht Briliant Blau 2 GLN, C. I. Sol. Bl. 48 in a mixture of castor oil, xylene and dimethylformamide in a ratio of 5:3:2 (by weight), and 1.1 wt.h. surfactant - emulsifier OP-10. The mixture was emulsiable using an ultrasonic disperser of USDN-1T (intensity of the acoustic field was 100 W/cm2) at a temperature of 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 wt.h. 37% aqueous formaldehyde and increased pH of the medium with 10% sodium hydroxide solution to 9.0, kept at room temperature for 12 hours While formaldehyde interacted with the amino groups of gelatin, forming transverse methylene bridges, which prevented the dissolution of the gelatin in the water. Thus received a 10% dispersion of microcapsules with a dye solution. The diameter of the microcapsules was equal to 1.0 to 1.5 μm.

As a demulsifier for separation of the particles from the dispersion used stearic acid brand "Advawax 330", a GIFT GmbH with purity of 98%. Neutralization of its melt water solution of caustic NMEs was heated to 40-45oC and thoroughly mixed paddle stirrer for 20 min at a rotation speed of 2,000-2,500 rpm stopping stirring, the introduction of 10% sulfuric acid solution was set to pH equal to 4.5. This was accompanied by the deposition of the emitted stearic acid in the microcapsules and the hydrophobicity of their surfaces. The resulting dispersion was stratified with the formation of a solid phase light blue color with the microcapsules, which were separated from the dispersion medium by filtration and washed with 5-fold amount of distilled water. The obtained microcapsules were dried at 60oC for 1 h and used for the purpose.

Testing of finished paper was performed using thermal head at a temperature 1402oC. the Time of contact of thermal head and the paper was 15 C. the effect of heat on the contact there was an increase in the color intensity of the wavelength interval 515-680 nm in average by 10%. Registration of spectra in the visible region were performed on a spectrophotometer SF-18. Simultaneously, the area of contact of thermocouple with the paper is clearly manifested in discrete points of bright blue 0.5-1.5 mm, Their appearance was carried out through the interaction of the dye, Nachod">

The use of the proposed paper with a thermosensitive coating provides compared to known its views increase the level of protection from unauthorized production and forgery. The manufacturing process of this paper involves the use of simple, time-stable chemicals, which allows to obtain products with high quality characteristics.

The paper is protected from tampering and unauthorized manufacture, consisting of a base paper and heat-sensitive color-forming coating, wherein the base paper contains dispersed in the paper pulp fat-soluble dye with a particle size of 7-10 μm, and heat-sensitive color-forming coating consists of distributed in the binder is gelatin microcapsules with a diameter of 1.0 to 1.5 μm with 0,15-0,30% solution of fat-soluble dye in a mixture of castor oil, xylene and dimethylformamide, in the membranes which precipitated stearic acid.

 

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