JPH0689172B2 - Antistatic resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a resin composition having antistatic properties.

(Prior Art) Generally, since plastic has a large electric insulation property, it is easily charged with static electricity, which causes a discomfort to a human body and is easily contaminated by adsorption of dust in the air.

In order to prevent such an electrostatic charge, an antistatic agent is kneaded into a resin or applied on the surface of a product. However, since many antistatic agents have low compatibility with resins, they easily exude to the surface of the product after kneading, and when applied, the effect decreases with time.

(Problems to be Solved by the Invention) An object of the present invention is to provide a resin composition having both good plasticity and antistatic property.

(Means for Solving Problems) The resin composition of the present invention comprises (a) a general formula: (R ₁ is an alkyl group having 1 to 13 carbon atoms which are the same or different) or (R ₁ is an alkylene group having 2 to 4 carbon atoms having the same or different carbon atoms, and R ₃ is an alkyl group having 1 to 13 carbon atoms having the same or different carbon atoms), and (b) a general formula (R ₄ is an alkyl group of _{4 to} 13 having the same or different carbon number) or (R ₅ is an alkylene group having 2 to 4 carbon atoms having the same or different carbon atoms, and R ₆ is an alkyl group having 1 to 13 carbon atoms having the same or different carbon atoms).

The tartaric acid diester has two hydroxyl groups each having a strong hydrophilicity and two carbonyl groups each having a strong hydrophobicity in the molecule, and the characteristics thereof largely differ depending on the type of the alkyl group bonded.

The tartaric acid diester used in the resin composition of the present invention has a carbon number of R ₁ of ₁ to 13, preferably 4 to 1 in the above general formula.
0, R ₂ has 2 to 4 carbon atoms, and R ₃ has 1 to 13 carbon atoms, preferably 4 to 10 carbon atoms. The reason is that if the carbon number of R ₁ is less than 14, the hydrophilicity is too strong and the boiling point is low, so that the vinyl chloride resin product obtained has poor water resistance, volatility resistance, heat resistance, etc. When the value exceeds 13, the compatibility with vinyl chloride resin is poor and the plasticity and antistatic properties are poor, so bleeding easily occurs on the surface of resin products, and products that are not sufficiently plasticized or products with insufficient antistatic properties Because you can only get it. Further, if the carbon number of R ₃ exceeds 13, the compatibility with the vinyl chloride resin is poor. When it is less than 4, the water resistance, volatility resistance, heat resistance and the like of the obtained vinyl chloride resin tend to be poor.

The tartaric acid diester represented by the general formula (1) or (2) is superior to the phthalic acid diester in antistatic property, but the phthalic acid ester represented by the general formula (3) or (4) is excellent in plasticity. When used in combination with the above, a further excellent antistatic property is exhibited due to the synergistic effect of both.

Diesters of phthalic acid, in the general formula, 4-10 4 to 13, preferably carbon number of R _4, the carbon number of R ₅ is 2 to 4, R ₆
Having 1 to 13 carbon atoms, preferably 4 to 10 carbon atoms are used.

Although the mixing ratio of the tartaric acid ester and the phthalic acid ester is not specified, it is generally used in the range of 1: 9 to 3: 2. The amount of each ester compounded with respect to the resin component is preferably 10 to 30 PHR of tartaric acid ester and 30 to 50 parts by weight of phthalic acid ester with respect to 100 parts by weight of resin.

The esters represented by the general formulas (1) to (4) used in the present invention can be easily obtained by, for example, a general method for producing tartaric acid ester or phthalic acid ester by reacting tartaric acid or phthalic anhydride with alcohol. .

As the above-mentioned preferable alcohol, in the case of non-ether alcohol, n-butanol, n-hexanol,
Examples thereof include i-heptanol, n-octanol, 2-ethylhexanol, i-nonanol, i-decanol, n-decanol, i-tridecanol, and mixed alcohols having 6 to 11 carbon atoms.
Examples thereof include ethylene glycol monobutyl ether, ethylene glycol mono-2-ethylhexyl ether, propylene glycol monohexyl ether, pyropyrene glycol monoheptyl ether and butylene glycol monobutyl ether.

The tartaric acid ester and the phthalic acid ester are typically mixed with a vinyl chloride resin, but not limited to this,
Particularly, it is mixed with vinyl acetate resin, nitrocellulose, cellulose acetate and the like.

Since the resin composition of the present invention contains the above specific tartaric acid ester and phthalic acid ester, it has excellent antistatic properties as well as plasticity.

Furthermore, a benzotriazole compound can be added to and mixed with the composition of the present invention to improve the initial colorability of the product.

Such a composition has the general formula (a) (R ₁ is an alkyl group having 1 to 13 carbon atoms which are the same or different) or (R ₂ is an alkylene group having 2 or 4 carbon atoms having the same or different carbon atoms, and R ₃ is an alkyl group having 1 to 13 carbon atoms having the same or different carbon atoms). (R ₄ is an alkyl group of _{4 to} 13 having the same or different carbon number) or (R ₅ is an alkylene group having 2 or 4 carbon atoms having the same or different carbon atoms, and R ₆ is an alkyl group having 1 to 13 carbon atoms having the same or different carbon atoms), and (c) a benzotriazole-based compound It is characterized by containing. Benzotriazole-based compounds have, for example, the general formula In particular, 1,2,3-benzotriazole, 2-hydroxy-5-methylphenylbenzotriazole, 2-hydroxy-5-octylphenylbenzotriazole, 2-hydroxy-3,5-di-t-butyl Phenylbenzotriazole is preferably used.

Benzotriazole compounds are generally known as ultraviolet absorbers, and are generally used in various resins in a range of about 0.5 PHR, and at most less than 1.0 PHR. However, in the composition of the present invention, it is generally used in the range of 0.5 to 3 PHR, preferably more than 1.0 PHR and less than 3.0 PHR. As described above, by using a larger amount than before, the effect of preventing the initial colorability when the resin composition is commercialized, and further improving the antistatic property in combination with the tartaric acid ester and the phthalic acid ester. Is also played.

In the resin composition of the present invention, the above general formula (1) or (2)
In addition to the tartaric acid diester represented by the formula (1), the phthalic acid ester represented by the general formula (3) or (4), and the above-mentioned benzotriazole-based compound, other conventionally known plasticizers, stabilizers, antioxidants, colorants, and fillers Agents and the like may be contained.

(Example) In the following, "parts" means "parts by weight".

Examples 1 to 10 To 100 parts of vinyl chloride resin (S-13 manufactured by Sumitomo Chemical Co., Ltd.), phthalic acid di-ester, tartaric acid di-ester and, if necessary, benzotriazole were blended in a ratio shown in Table 1, and further vinyl chloride was added. As a general-purpose stabilizer for the resin, 2.5 parts of Ba-Zn liquid stabilizer (LTL-272 manufactured by Nissan Fuero Co., Ltd.) was mixed and rolled and pressed according to a conventional method to obtain a soft vinyl chloride resin sheet having a thickness of 1 mm.

The surface of the sheet was not sticky and had excellent transparency. Table 2 shows the results of measuring the surface resistance of the sheet with a surface resistance measuring instrument (Statco TR-2) manufactured by Tokyo Denshi Co., Ltd. and measuring the initial coloration of the sheet by a 6-step method.

Comparative Examples 1 to 5 The vinyl chloride resin used in the examples was added to di-2-ethylhexyl phthalate (DOP, Comparative Example 1) and dibutyl phthalate (DBP,
Comparative Example 2), diisodecyl tartrate (Comparative Example 3), ethylene glycol monohexyl ether tartaric acid ester (Comparative Example 4), and propylene glycol monobutyl ether (Comparative Example 5) were distributed at 50 PHR each, and the resin sheet was prepared in the same manner as in the Example. Got This characteristic is shown in Table-2.

Measurement conditions (same for comparative examples) ・ Tensile strength 20 ° C, dumbbell No. 3 ・ Volume loss 100 ° C × 24 hours ・ Water resistance 50 ° C × 24 hours Immersion ・ Colorability 6-level evaluation 1 (colorless) 6 (yellow) (invention) Effect) The resin composition of the present invention has both good plasticity and good antistatic property and is of high practical value.

Further, the composition of the present invention containing a triazole-based compound,
Not only the initial coloring is small, but also excellent antistatic ability is exhibited.

Claims (2)

[Claims] 1. A general formula: (R ₁ is an alkyl group having 1 to 13 carbon atoms which are the same or different) or (R ₂ is an alkylene group having 2 or 4 carbon atoms having the same or different carbon atoms, and R ₃ is an alkyl group having 1 to 13 carbon atoms having the same or different carbon atoms), and (b) a general formula (R ₄ is an alkyl group of _{4 to} 13 having the same or different carbon number) or (R ₅ is an alkylene group having 2 or 4 carbon atoms having the same or different carbon atoms, and R ₆ is an alkyl group having 1 to 13 carbon atoms having the same or different carbon atoms). Preventive resin composition. 2. (a) General formula (R ₁ is an alkyl group having 1 to 13 carbon atoms which are the same or different) or (R ₂ is an alkylene group having 2 to 4 carbon atoms having the same or different carbon atoms, and R ₃ is an alkyl group having 1 to 13 carbon atoms having the same or different carbon atoms), a tartaric acid diester (b) a general formula (R ₄ is an alkyl group of _{4 to} 13 having the same or different carbon number) or (R ₅ is an alkylene group having 2 or 4 carbon atoms having the same or different carbon atoms, and R ₆ is an alkyl group having 1 to 13 carbon atoms having the same or different carbon atoms), and (c) a benzotriazole-based compound An antistatic resin composition comprising: