SU1413587A1 - Method of producing a sensitometry wedge - Google Patents

Abstract

The invention relates to photographic sensitometry and reduces the spread of diffuse optical densities in the wavelength range of 400-800 nm. A mixture of polymerized film-forming and filler is applied to the profiled matrix, on top of which a glass plate is applied. Oligocarbonate is used as a film-forming agent; crylate or dimethacrylate-bis- (triethylenglycol) phthalate with a viscosity of 200-400 sp The filler is activated carbon dispersed in acetone. After polymerization at room temperature, the matrix is separated. 1 tab.

Description

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The invention relates to photographic sensitometry, more specifically to the manufacture of step sensitometric wedges, working as exposure moduli.

The purpose of the invention is to reduce the spread of diffuse optical densities in the wavelength range from 400 to 800 nm,

The essence of the proposed method is that the particles of active carbon dispersed in an organic solvent have less adhesion compared to graphite, therefore, polymer solutions with a viscosity of 200-400 cP are used, which allows a more equal distribution. pick up the particles of active carbon in the layer and make sensitometric wedges with a more uniform absorption of light in the whole range in the visible region of the spectrum. Use of polymerization. substances with a viscosity of 200-400 cP is a necessary condition, since the use of a substance with a lower viscosity leads to the fact that the fine particles of active carbon are collected in large conglomerates, which leads to an increase in the optical density spread of the sensitometric wedge. And the use of a substance with a viscosity of more than 400 cP does not allow to achieve the required uniform distribution of the filler in the polymer binder, which also increases the spread of optical densities.

The solvent is removed under vacuum to speed up the process. With the same purpose, injecting the polymerization accelerator into the oligomeric composition in an amount of 0.2-0.1% by weight of the oligomer ,. Accelerator should not paint the polymer film.

The activating ability of all available transparent polymerization accelerators is almost the same; the polymerization process is completed in 24 hours at room temperature or in 12 hours at room temperature and

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then 4 hours at 65 C.

If the polymerization is carried out immediately at a temperature higher than room temperature, then due to a decrease in the viscosity of the polymerization-capable substance, fine particles of active carbon are collected in large conglomerates, which increases the dispersion of optical densities.

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wedge and impairs the uniformity of the distribution of the filler.

EXAMPLE 1 A suspension of active carbon dispersed in acetone (the active carbon content is 0.1% by weight of the oligomer) is introduced into oligocarbonate methacrylate OKM-2, acetone is removed by vacuum, the polymerization initiator is added (0 , 75% benzoyl peroxide by weight of oligomer) polymerization accelerator (O-, 5% by weight of oligomer 0.25% dimethylaniline solution in styrene), the resulting mixture is applied to a metal matrix with a relief height of 0.08 mm, treated with anti-adhesive agent (0,025% solution of isobutylene in hexane), on top the glass plate is adhered, treated with an agent that enhances the adhesion of olkarocarbonate methacrylate to it (1% alcoholic solution of methacrylate methyltriethoxysilane) and polymerized at room temperature for 24 hours.

After separation of the matrix and the glass substrate, a sensitometric wedge is obtained in the form of a polymer film on a glass substrate.

Example 2. It is carried out analogously to Example 1, but the polymerization is carried out in two stages: for 2 hours at room temperature and 4 hours at 65 C. Example 3, A mixture of oligocarbonate methacrylate OKM-2 and the initial film-forming transparent polymerization substance is taken OKM-5 oligocarbonate methacrylate (mixture of viscosity 400 cP), 4% dibutyl phthalate by weight of the mixture is added, acetone suspension of active carbon is introduced, but the glass substrate is not treated with methacrylatemethyltrihoxysilane, then the same operations are performed as in the example 1 and n and the same conditions,

After the connector of the matrix and the glass substrate, a sensitometric wedge in the form of a polymer film is obtained;,: Example4. In film-forming. The transparent substance dimethacrylate bis (triethylene glycol) phthalate (MPT-9) is injected into suspensions of active carbon dispersed in acetone (the content of active carbon is 0.1% by weight of MTF-9) and carried out same operations. What in example 1. And under the same modes,

31413587

The table shows the values of calls n m n n s s in a flat film in gi

The diffuse densities of the obtained sensitometric wedge, in which active carbon dispersed in an organic solvent is used as a filler.

Claims (1)

The scatter of the values of zonal diffuse densities in the visible range of the spectrum for the samples obtained by the proposed method does not exceed 5%, while in the prototype method this scatter is at least 10%. Invention Formula A method of making a sensitometric wedge on a glass plate including deposition of a mixture containing a polymerizable film-forming and filler onto a profiled matrix, placing a glass plate on top of the mixture, bringing polymerization at room temperature and separating the matrix, is distinguished by the fact that, in order to reduce the spread of diffuse optical densities in the length range wavelengths from 400 to 800 nm; oligocarbonate methacrylate or dimethacrylate-bis-triethyleneglycol) -phthalate with a viscosity of 200-400 cP is used as a polymerized film-forming agent; coal, dispersed in acetone.