JPH0423858A - Polycarbonate resin composition - Google Patents

Abstract

PURPOSE:To obtain a transparent polycarbonate resin composition having excellent color tone by blending a polycarbonate resin with a specific amount of a specified compound. CONSTITUTION:A polycarbonate resin composition is obtained by blending a polycarbonate resin with a compound expressed by formula I and/or a compound expressed by formula II in an amount of 0.3-3ppm, preferably 0.4-2ppm. The compound expressed by formula I or II is a blue dye, readily available by reacting quinizarin with an aromatic amine expressed by formula III or TV, capable of exhibiting excellent bluing effects with a very small amount thereof added and good in also heat resistance at high temperatures.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to polycarbonate resin compositions (Prior Art) Polycarbonate resin has excellent mechanical properties, heat resistance, electrical properties, etc. It is a type of engineered plastic used for parts, daily necessities, and other films and sheets.

Polycarbonate resins are usually manufactured using a phosgene method using a dioxy compound and phosgene (for example, bisphenol A with Na
It is manufactured by the interfacial polymerization method of salt and phosgene) or the ester exchange method using diphenyl carbonate compound and dioxy compound (for example, the transesterification method of bisphenol A and diphenyl carbonate), but this uncolored transparent product has a slightly yellowish tinge. The color tone is For this reason, for applications that take advantage of transparency, such as plastic lenses (auto parts, camera parts, eyeglasses), glass, bottles, cases, etc., a very faint blue-purple color called bluing is often applied. Conventionally, blue to purple dyes for resin coloring have been used as colorants in this case, but the molding temperature of polycarbonate resin is extremely high and heat resistance at high temperatures is required (26
(0 to 340° C.), it is necessary to exhibit a predetermined bluing effect with the addition of a very small amount, and strict performance is required, and in many cases it is difficult to obtain the desired molded product.

<Problems to be Solved by the Invention> The present inventors have studied a resin coloring dye that exhibits a good bluing effect with a very small amount added to polycarbonate resin and also has good heat resistance at high temperatures. As a result of our efforts, we discovered that these objectives could be achieved by using specific compounds, and completed the present invention.

That is, an object of the present invention is to provide a transparent polycarbonate resin composition having a good color tone obtained by adding a specific compound.

<Means for Solving the Problems> The present invention provides a polycarbonate resin and a compound (I) and/or (n) represented by the following structural formula in an amount of 0.3 to 3 ppm based on the resin. The gist is a polycarbonate resin composition containing the following.

H3 The polycarbonate resin used in the present invention is a thermoplastic resin having an aromatic polycarbonate structure R' (R, R' are H, C, ~6 alkyl), and is obtained by the reaction of an aromatic dioxy compound and phosgene. and those obtained by transesterification of an aromatic dioxy compound and diphenyl carbonate.

Specific product names include Panlite (Kijin Kasei), Kneepilon (Mitsubishi Gas Chemical), Tubarex (Mitsubishi Chemical Fy,
), Taflon (Idemitsu Petrochemical), Calibra (
Dow chem, ), etc.

Compound (I) or (It) used in the present invention is a blue dye that can be easily obtained by a 0-CHs-CaL reaction. Compound (I) or (n) below may be used alone or in combination. The total amount of the compounds (I) and (n) added is 0.3 to 3 with respect to the polycarbonate resin.
pf'm, preferably 0.4 to 2 ppm.

The polycarbonate resin composition of the present invention can be obtained by a known method. For example, polycarbonate resin and the compound are mixed by an appropriate method, heat, pressure, etc. are applied, and injection molding is performed.
A composition is prepared by a method such as extrusion processing.

Specifically, for example, polycarbonate resin, compound (I
) and/or (II), and various additives (e.g. polymeric additives such as light stabilizers, antioxidants, deterioration inhibitors, heat stabilizers, etc.) as necessary, and then mixed using a Ni-Goo, roll mill, or mixer. , the compound is uniformly dissolved in the resin using an extruder or the like. If necessary, further molding such as pressure, injection, extrusion, blowing, etc. is performed to obtain the desired colored composition. It is also possible to obtain the desired resin composition by adding the compound and other various additives as necessary to a raw material dioxy compound containing a polymerization catalyst, diphenyl carbonate, and polymerizing the mixture.

<Effects of the Invention> According to the present invention, compound (I) is added to the polycarbonate resin.
By containing a very small amount of (It) or both, a resin composition having a good color tone can be obtained.

<Examples> Next, the present invention will be further explained by specific examples, but the present invention is not limited to the following examples. In the examples, parts represent parts by weight.

Synthesis example 1 C,H.

@11. Charge 4.6g of boric acid and 12.5a+1 glacial acetic acid into a flask, and heat to 200°C while blowing in N and gas.
Stir for 1.5 hours. After that, continue to blow in N2 gas, and remove water and acetic acid by distillation.
Insulate at 0°C for 5.5 hours. Add a large amount of dilute hydrochloric acid (aqueous solution) to the reaction mass and stir well. After filtering the precipitate,
Add the filter cake to 200 ml of Cellosolve, then 10
Keep warm at 0°C. Add 5.0 g of NaBOs (sodium perborate) in portions, then boil for 15 minutes and filter hot. The filtrate is cooled, the precipitate formed is filtered, and the cake is dissolved in hexane. After filtering out insoluble materials, hexane was expelled and the mixture was dried to obtain 7.4 g of compound (I). mp 198-200°C Synthesis Example 2 Compound (II) 7°3 was prepared in the same manner as in Synthesis Example 1 except that
I got g.

Examples, Comparative Examples [Preparation and evaluation of polycarbonate resin composition] Polycarbonate resin Calibra 3QQ-IQ natu
500 parts of ral (uncolored PC resin manufactured by Dowchemica 1) and 0.0 parts of the compound (dye) shown in Table 1.
After premixing 00005 parts (0.5QQm based on the resin), the mixture was mixed and dispersed in extrusion 1 (240°C) to form a resin pellet (
composition). 3.5g of these pellets were put into an injection molding machine (
290°C) to form a 4 cm x 6 cm x 2 m thick plate.

The obtained molded plate was evaluated for b0 value (yellowness) by colorimetry, yellowness by visual observation, and bluing effect. The results are shown in Table-1.

As is clear from the above results, compound (1).

(2) shows a better bluing effect than other anthraquinone compounds (blue to purple).

Table 1 shows compounds with poor herbaceous heat resistance (injection molding at 340°C) (blank below) C, H.

Nll.

CH(CH3)2 Sumiplast 1olet [Sumitomo Chemical] leaf (Left below)

Claims (1)

[Claims] Polycarbonate resin and 0.3 to
A polycarbonate resin composition containing 3 ppm of the following compound (I) and/or (II). ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(II)