Composition for covert recording of information and the way covert recording information

 

(57) Abstract:

Use: chemical-photographic industry. The inventive composition for covert recording information, comprising a solution containing, wt.%: the phosphor of 0.1 - 5; binder 1 - 5; organic solvent - rest, and a solution B containing, in wt.%: the phosphor other than the phosphor of the solution, 0.1 to 5; binder 1 - 5; organic solvent - else, if the value of the solutions a and B in the composition is equal to(1:10) - (10:1). The way covert recording information is applied to the substrate solution And, keeping to the evaporation of the solvent, the formation of film, processing its solution, drying and UV illumination-light. 2 S. p. f-crystals, 2 tab.

The invention relates to methods of covert recording information, in particular to methods of covert recording information compounds, including substances y when irradiated with ultraviolet (UV) light.

Known composition for recording hidden information, including the solution of polycyclic aromatic hydrocarbons in polyolefins, such as polyethylene (USSR Author's certificate N 476592, CL G 11 B 7/26, published. 1975). Using this composition, recording and erasing it by heating the film Khujand is the playing technique is photosensitive fluorescent material, in which the photosensitive composition for hidden recording information includes the phosphor-4-azidoaniline, polymer binder, for example, polystyrene and organic solvent is toluene. (AU USSR N 1197562, CL G 03 C 1/72, published. 1991). This composition is applied to a polymer or glass substrate is dried at room temperature, exhibiting a light mercury lamps DRSH-1000 in the range of 250-360 nm through the negative. Read the information in the coverage of the same lamp in the range of 360-410 nm. Get glowing blue positive image. The disadvantage of the proposed invention is the composition for covert recording information including the phosphor, polymer binder and an organic solvent, optionally phosphor having the property of tusitala luminescence. The use of same for the purpose of the hidden marks only the phosphor makes way narrowly limited, registered only the fact of a luminescence label, does not take into account the color (different phosphors are illuminated differently from blue to dark brown), there is no possibility of their combination. All this leads to low efficiency of the given prototype.

The aim of the invention is the extension of functionality due to the fact that the substrate, that is the background, deposited on the surface. The background to apply the label is made with a solution containing a phosphor having a luminescence spectrum, which is different from the spectrum of luminescence of the phosphor substrate region of the spectrum. In the place of overlay layers containing two phosphor, one of which also has the property of tusitala luminescence occurs luminescence quenching of the underlying layer, and information clearly stands out brightly luminescense surface.

In the above example, two well-known phosphor are used, it would seem, by its purpose, however, the fact that one of the phosphors is both tusitala, leads to the emergence of a new quality: the potential application of a contrasting image on the colored background without color mixing, because the color of the background goes out.

Thus, this objective is achieved in that the composition for covert recording information, comprising a solution containing a phosphor, a binder and an organic solvent, includes the above solution (solution A) in the following ratio, wt. The phosphor of 0.1-5 Binder 1-5

Organic dissolve ritel Rest and further, in the following ratio, wt. The phosphor of 0.1-5 Binder 1-5

Organic dissolve retell the Rest in the following ratio of solutions a and B in the composition is equal to(1:10)-(10:1).

The way information is recorded by applying to the substrate a solution comprising a phosphor, a binder and an organic solvent, keeping to the evaporation of the solvent, skinning, lighting, UV light, characterized in that use this solution (solution A) in the following ratio, wt. The phosphor of 0.1-5 Binder 1-5

Organic dissolve retell the Rest of the obtained film is treated with solution B comprising a phosphor other than the phosphor And binder and an organic solvent in the following ratio, wt. The phosphor of 0.1-5 Binder 1-5

Organic dissolve ritel Else if the value of the solutions a and B in the composition is equal to(1: 10)-(10: 1), and dried. The surface on which put the hidden information can serve as metal, rubber, glass, enamel, plastic, paper, leather, wood, ceramics.

The selected concentration of the phosphors from 0.1 to 5% due to practical considerations. 0.1% phosphor sufficient to UV lighting-the sense because the brightness is not increased and only leads to a waste of himreaktiv. The binder concentration 1-5% sufficient to ensure adhesion of the phosphor to the product. The selected value of the solutions a and B in the composition is equal to(1:10)-(10:1), due to the material, which cause hidden information. So, when marking rubber wheels require a tenfold increase in the film thickness of one of the solutions a or B. In the case of applying marks on banknotes layer should be thinner 1:1. Going beyond the stated ratio(1:10)-(10: 1) makes no sense for practical reasons.

The invention can be used as part of a passive system passive protection, such as cars, household items, expensive electronics, furs, etc.

Currently in several European countries "European standard passive anti-theft". Part of this system are invisible codes that are only visible when illuminated with a UV lamp. In Russia, the interior Ministry began to implement the system since mid-1993, As can be seen from example 2, the invention can be applied MIA and FGC, as the inscription on the paper bill can be performed with a solution of (2-hydroxy-2-were) benzotriazole 10-4-10-5so lighting bills mercury lamp, typically used for these purposes, for example, DRG-100, it is not possible to read the inscription. Next on the bill is applied to the background solution containing a phosphor with a high quantum yield of luminescence, for example, 1,4-di(2-phenyl)oxazolyl benzene. In place of the overlay layer when illuminated with UV light on a blue background appears black hidden message.

P R I m e R 1. On the surface of the metal put a layer of a composition containing 20 g of benzene (98%), 0.4 g of polystyrene (1.9%) and 0.02 g (0,01%) of 1,4-di-(4-phenyl-2-oxytrol benzene). After evaporation of benzene on the surface put a label composition containing 20 g of benzene, 0.4 g of polystyrene and 0.01 g 2(2-hydroxy-5-were-benzotriazole) and can stand up to the evaporation of the solvent. When illuminated with UV light of the main spot (background) lights up in blue (260 N. M.), and red label.

P R I m m e R 2. On the surface of banknotes put the text composition containing RS 9.69 g (96.9 percent) of dimethylformamide, 0.3 g (3,0%) of polymethyl methacrylate and 0.01 g (0.1%) of 2-(2-hydroxy-5-methoxyphenyl)benzotriazole. After evaporation of benzene, the inscription is visible when illuminated with a powerful mercury lamp, for example DRSH-1000, the inscription is invisible when using a source of UV radiation less powerfully the TA and 0.01 g (0.1%) 1,4-di(2-phenyl)oxazolyl benzene. When illuminated with a mercury lamp inscription black color contrast stands out on a luminous bluish background. Other examples in the table. 1. Structural formulas of the compounds used are given in table.2.

1. Composition for covert recording information, comprising a solution containing a phosphor, a binder and an organic solvent, characterized in that the composition comprises a solution in the following ratio, wt.

The phosphor 0,1 5,0

Binder 1 5

Organic solvent Else

and additionally includes a solution B containing a phosphor other than the phosphor of the solution, a binder and an organic solvent, in the following ratio of components, wt.

The phosphor 0,1 5,0

Binder 1 5

Organic solvent Else

when the value of the solutions a and B in part 1 10 10 1.

2. The way covert recording information by applying to the substrate solution And comprising a phosphor, a binder and an organic solvent, keeping to the evaporation of the solvent, education, film and lighting of the ultraviolet light, wherein the use solution in the following ratio, wt.

The phosphor 0,PR B, including a phosphor other than the phosphor of the solution, a binder and an organic solvent, in the following ratio, wt.

The phosphor 0,1 5,0

Binder 1 5

Organic solvent Else

when the value of the solutions a and B in part 1 10 10 1 and dried.

 

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1 ex, 1 tbl

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