RU654073C - Colored polycarbonate composition - Google Patents

Description

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The invention relates to the field of producing transparent colored plastic compositions that can be used in the manufacture of optical filters for various fields of instrumentation, electronics, simple photo and film optics, etc.

Known colored plastic compositions based on thermoplastics with the addition of organic dyes. For transparent coloring, fat-soluble organic dyes are used, as well as various polycyclic pigments (perylene, quinacridone, anthraquinone). In this way, transparent colored materials are obtained, characterized by a certain transmission spectrum in the visible region of the spectrum, depending on the type of organic dye and its concentration in the polymer.

Painted compositions based on polycarbonate are especially promising, since it possesses a number of valuable properties: high resistance to shock loads, rather high heat resistance (up to 150 ° C by Wick) in combination with quite satisfactory transparency.

The preparation of colored transparent polycarbonate has been described in literature.

It is known that to obtain colored transparent polycarbonate, a solution of the red dye Rubinol spritrein in chlorobenzene can be used, which is fed directly to the extruder and the solvent is evaporated in the usual manner. The result is a clear pink polycarbonate.

Describes the method of dyeing in the mass of transparent polycarbonate red-orange color. For this purpose, in one case, 0.1% (by weight) of 1,4-dioxoanthraquinone is introduced into the polymer, and in the other case, 0.1% (by mass) of 1,2-5,8-tetraoxyantraquinone: and to obtain a transparent yellow polycarbonate, color is recommended. use 0.05% (by weight) of 8.8-dioxinaphthazine.

The disadvantage of all the above methods for producing colored transparent polycarbonates is the complete absence of certain lighting characteristics of the materials obtained (chromaticity coordinates, values of the dominant wavelength and color purity, integrated and spectral transmittance).

Closest to the technical nature of this invention is a known colored polycarbonate composition consisting of polycarbonate and 5,8-bis-p-toluidinoquinisarin. The patent describes the use of anthraquinone class dyes for dyeing in the mass of thermoplastics, including polycarbonate, in various shades of green. The patent lists a large number

bis-arylaminoquinizarine dyes, which have significant heat resistance, sufficient to withstand without decomposition temperatures from 240 to

ZOOoS for relatively long periods of time. Among them, 5.8bis-p-toluidinoquinizarin is also named.

The specified dye is introduced in an amount of from 0.005 to 1%, preferably from

0.05 to 0.5% in terms of 100 g of polymer. Plastics dyed in this way are distinguished by transparency, hue, good light and weather resistance.

Based on the known composition, a transparent green polycarbonate is obtained, colored 0.03% (by weight) of 5.8bis-p-toluidinoquinisarin, which is characterized by a maximum transmission in the visible region of the spectrum at a wavelength

 nm Lighting characteristics of this material are given in table. 1,

However, by its spectral characteristics, this material cannot be used for the manufacture of semiconductor

digital sign indicators for computers and calculators, since its maximum transmittance (L 520 nm) lies outside the required spectral range of wavelengths (540560 nm).

An object of the present invention is to provide a colored material with a maximum transmission in the wavelength range of 540-560 nm. A material with the indicated properties is necessary for the manufacture of semiconductor digital-sign indicators for computers, calculators, and special-purpose products. As a source of;: eta, the aforementioned indicators use luminescence of semiconductor single crystals emitting in the wavelength range of 540-560 nm.

Thus, the colored material cannot be used to create these devices, since its maximum transmittance lies outside the aforementioned wavelength range.

The goal is achieved by the fact that the painted polycarbonate. the composition further comprises transnaphthoyl dibenzimidazole in the following ratio of components, wt.h .;

Polycarbonate100

 5.8-Bis-p-toluidinoquinizarin0.01-0.02

Transnaphthoylene dibenzimidazole 0.02-0.03.

By varying the ratio of the components, a colored material can be obtained with different values of integral transmittance.

The invention is illustrated by the following examples.

PRI me R 1, 100 m.h. polycarbonate powder - mixed in a ball mill with 0.02 wt.h. 5.8-bis-p-toluidinoquinizarin and 0.02 parts by weight transnaphthoylene dibenzimidazole; the mixture is dried under vacuum and extruded at 250 ° C. Get transparent, green-yellow colored polycarbonate granules. Lighting characteristics of the obtained material are given in table. 1.

PRI me R 2. 100 wt.h. granular polycarbonate is subjected to dry mixing in a mixer type Turbula with 0.02 vol. 5.8-bis-p-toluidinoquinizarin and 0.03 parts by weight transnaphthoylene dibenzimidazole: the mixture is dried and homogenized in a conventional extruder. Get a transparent granular material, painted in a greenish yellow color. Lighting characteristics of the obtained material are given in table. 1.

Sample 100 wt.h, polycarbonate powder is mixed in a ball mill with 0.01 wt.h. 5.8-bis-p-toluidinoquinizarin and 0.02 parts by weight transnaphthoylene dibenzimidazole: the mixture is dried under vacuum and extruded at 250 ° C. Get transparent granules of polycarbonate greenish yellow. The material is processed in the usual way (for example, by injection molding). Lighting characteristics of the material are given in the table. 1.

In the table below Figure 2 shows the lighting characteristics of the proposed composition in comparison with the known concentrations of 5.8-bis-p-toluidinoquinizarin 0.01 and 0.02 wt.%.

The drawing shows spectral transmission curves for compositions of this invention containing 0.01 (curve 1) and 0.02% (curve 2) of 5.8-bis-p-toluidinoquinisarin (according to Examples 1 and 3). The curves have a maximum transmission in the wavelength range of 540-560 nm.

The same drawing shows for comparison the spectral transmission curves of a known colored composition (dashed line) containing 0.01 (curve 1) and 0.02% (curve 2) by weight of 5.8-bis-ptoluidinoquinisarin. These curves have a maximum transmittance at a wavelength of 520 nm.

The data presented show that the obtained composition significantly exceeds the known one in terms of integrated transmission and color purity, and in terms of spectral characteristics it is completely within the specified wavelength range (transmission maximum lies at a wavelength of 550 nm).

The combination of these properties makes it possible to use the obtained material for the manufacture of semiconductor digital-sign indicators for computers, calculators, and special products.

Currently, for the manufacture of parts for digital indicator housings, the aforementioned devices use colored polystyrene, which has a low operating temperature (up to + 70 ° C). The use for this purpose of colored polycarbonate, as a more heat-resistant material (maximum working temperature + 130 ° C), will significantly expand the temperature range of the digital indicators. In addition, said material is highly resistant to impact loads, which also increases the service life of the above devices.

The proposed painted composition can also be used in instrumentation, for the manufacture of products of light-signal and lighting equipment, for the production of lamps, and safety glasses from certain types of radiation.

(56) German Patent N; 1248294, cl. 39 b 22/10, published. 1968.

Germany patent No. 1294674, class 39 b 8, 1/74, published. 1972,

UK patent N 1387609, CL SZ R, published. 1975.

German Patent M 2037123, class 39, b 8, 1/74, published. 1974.

Lighting performance of colored polycarbonate

Table 1

/ The spectral transmission curves were recorded on an SF-14 non-recording spectrophotometer on disks: 050 mm and 1 mm thick (obtained by injection molding). Integral transmittance was determined on a photometer described in GOST 10667-63. Calculation of lighting characteristics was carried out according to GOST 9242-59 for a standard colorimetric light source A (GOST 7721-61) with a color temperature of 2854 K.

..:., -:, ..-.-. V /. .Table 2 Formula of a DYEED PAINTED POLYCARBONATE COMPOSITION, consisting of plicarbosate nat and 5,8-bis-p-toluidinoquinisarin, characterized in that in order to increase the material with a maximum transmission in the wavelength range of 540 - 560 nm , it additionally contains transnaphthoylandia. benzimidazole in the following ratio of components, parts by weight: Polycarbonate 5.8-Bis-p-toluidinoquinise0.01 - 0.02 Transnaphthoylene dibenzimi0.02 - 0.03