JPH04246442A - Antistatic resin composition resistant against water washing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a water-resistant antistatic resin composition that has a constant and excellent antistatic property and is based on a thermoplastic resin that is a mixture of a polyolefin resin and/or a polystyrene resin and a polyamide resin. It is about things.

0002

2. Description of the Related Art Conventionally, conductive resins with excellent antistatic effects have been used for carrier cases and packaging of electronic parts to protect ICs, LSIs, etc. Most of the antistatic (conductive) resins used in this case contain carbon black as a conductivity imparting agent due to issues such as price, electrical properties, and mechanical properties. However, although a thermoplastic resin containing carbon black has good conductivity, the color tone of the resulting molded product is black, making it unsuitable as a conductive resin when color separation is required. Currently, it cannot be used in applications where stains caused by black are averse.

[0003]Also, there are methods of using antistatic agents, such as kneading them into resin or coating them on the surface of molded products, but both methods have the disadvantage that the effect (conductivity) disappears in a short period of time. be. For this reason, in recent years, various antistatic resins in which hydrophilic resins are blended with thermoplastic resins have been developed and studied. However, the common drawbacks of products containing hydrophilic resins are that the physical properties of the molded product (e.g., elongation, tensile strength) are significantly reduced, and the surface of the molded product tends to become sticky and attract dust. There are drawbacks such as.

[0004] Therefore, the present inventors previously developed IC and LSI
A colorable antistatic thermoplastic resin composition (patent application patent) that can be used to color carrier cases and packaging materials for protection, etc., is easy to mold, and has excellent mechanical properties of the resulting molded products. No. 2-295277).

[0005]

[Problem to be solved by the invention] However, in recent years, there has been an increase in the number of cases in which a water-washing process is adopted for IC packaging supplies, which is one of the applications of the above products, and as a result, molded products using antistatic agents, etc. After washing with water, the antistatic effect does not disappear instantly, but the antistatic effect tends to decrease if washing is repeated many times. Therefore, the present inventors investigated the development of colorable conductive (antistatic) resins with excellent water wash resistance for polyolefin resins and polystyrene resins, which are general-purpose resins with a wide range of uses.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides (A) a polyolefin resin and/or a polystyrene resin with a period of 0 of the metals and/or metal salts of group ▲1▼ and/or group ▲2▼ of the Table of Laws
．． 01 to 15 parts, (C) 0.01 to 15 parts of polyhydric alcohol compound.
5 to 20 parts, (D) 2 to 90 parts or more of polyamide resin,
This is a wash-resistant and antistatic resin composition characterized by blending three components (B), (C), and (D) into component (A).

[0007] As the thermoplastic resin of component (A) used in the present invention, polyolefin resins and polystyrene resins are used. In detail, polyolefin resins include linear polyethylene, high-pressure polyethylene, polypropylene, copolymers of ethylene and α-olefin, ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers, ionomers, polybutene, and polymethylpentene. etc.

[0008] Polystyrene resins include polystyrene, high impact polystyrene, AS resin, A
Examples include BS resin, styrene maleic anhydride copolymer, and the like. Note that the resin as component (A) may be used alone or in combination of two or more.

(B) Groups ▲1▼ and ▲ of the periodic table of components
Examples of group 2▼ metals include lithium, sodium, potassium, beryum, calcium, magnesium, and aluminum. In addition, metal salts of groups ▲1▼ and ▲2▼ include halides, perchlorates, perbromates, chlorates, bromates, thiocyanates, nitrates, sulfates, and phosphoric acids. salts, fatty acid salts, etc., and specific compounds include potassium thiocyanate, sodium thiocyanate, lithium thiocyanate, lithium sulfate, lithium stearate, lithium chloride, lithium perchlorate, and the like.

Examples of the polyhydric alcohol compound (C) include polyethylene glycol, polypropylene glycol, glycerin, polyvinyl alcohol, sorbitol, and derivatives thereof. The polyamide resin of component (D) includes 6-nylon, 66-nylon, 12-nylon, 6-nylon elastomer, 1
Examples include 2-nylon elastomer. In particular, in the present invention, by blending component (C) and component (D), (B
) component is extremely well dispersed in component (A) resin,
Therefore, the conductivity is significantly improved.

In the present invention, a metal of group (1) and/or group (2) of the periodic table as component (B) and/or a metal salt thereof is added to 100 parts by weight of the resin as component (A). 0.01 to 15 parts of one or more of these are blended. In this case, if the amount of component (B) used is less than 0.01 part, a sufficient conductive effect cannot be obtained, which is not preferable. On the other hand, if more than 15 parts are added, the conductivity effect will not be particularly improved, but rather the mechanical properties of the resin composition will deteriorate, which is not preferable. still,
Particularly preferably, component (B) is contained in an amount of 0.1 to 10 parts because the balance between electrical properties and moldability is particularly good.

[0012] The polyhydric alcohol of component (C) has a content of 0.5 to
Blend 20 parts. If the amount of component (C) used is less than 0.5 parts, the dispersibility of component (B) into the resin of component (A) will not improve, and excellent conductivity will not be obtained, which is not preferable. On the other hand, even if 20 parts of component (C) is added, the dispersibility and conductivity of component (B) are not particularly improved, and the mechanical properties of the composition are rather deteriorated, which is not preferable. Component (D), a polyamide resin, is blended in an amount of 2 to 90 parts. In this case, if the amount of component (D) used is less than 2 parts, it is not preferable because the excellent water wash resistance, which is the most important feature of the present invention, cannot be obtained. On the other hand, (D)
Even if more than 90 parts of the ingredients are blended, the water wash resistance will not improve and the resulting product will be expensive, which is not preferable. There are no particular restrictions on the method for producing the water-washable, antistatic resin composition of the present invention, and various additives may be added using conventional methods.

[0013] Any dye or pigment used in coloring the composition of the present invention may be used as long as it is conventionally used. For the purpose of easily dispersing the dye and pigment, fatty acids, fatty acid metal salts, low molecular weight polymers, fatty acid waxes, etc. may be added. Further, if necessary, other additives such as antioxidants, photodegradation inhibitors, plasticizers, lubricants, compatibilizers, flame retardants, nucleating agents, etc. can be added at an appropriate time. Other fillers or fillers that may be used include glass fiber, carbon black, silica, calcium carbonate, calcium silicate, potassium titanate, and walrus night. Examples and comparative examples are described below.

00
14] Example 1 (A) Powdered polystyrene resin
100 parts (B) Potassium thiocyanate
Part 5 (C) Glycerin
Part 3 (D)
Powdered 6-nylon
10 parts or more of 4 ingredients are blended using a Henschel mixer, then kneaded and extruded using a single screw extruder,
Pellets of the washable and antistatic resin composition of the present invention are obtained. Next, using an injection molding machine using the above pellets,
A test sample of 40 x 40 x 2 mm is prepared. Thereafter, Examples 2 to 4 and Comparative Examples 1 to 2 are also conducted in the same manner as in Example 1. From now on, use (A)
, (B), (C) and (D) components only.

Example 2 (A) Powdered polystyrene resin
100 copies (B) NaI
Part 5 (C) Glycerin
3 parts (D) Powdered 12-nylon elastomer 5 parts Example 3 (A) Powdered ABS resin
100 parts (B) Potassium thiocyanate
3 parts (C) Glycerin monostearate 6 parts (D) Powdered 6-nylon
10 parts Example 4 (A) Powdered polypropylene resin
100 parts (B) Potassium thiocyanate
5 parts (C) decapolyglycerin 9 parts (D)
Powdered 6-nylon
20 copies

Comparative Example 1 (A) Powdered polystyrene resin
100 copies (B) KI
Part 5 (C) Glycerin
3 parts (D) Powdered 6-nylon
1 part Comparative Example 2 (A) Powdered high-density polyethylene resin 1
00 parts (B) NaI
Part 8 (C) Glycerin
7 parts (D) Powdered 6-nylon
0.5 part

Next, Example 1
~4, and each sample obtained in Comparative Examples 1 and 2, was measured using the test method in (a) below, and the results were

It is shown in [Table 1]. (b) Wash the half-life measurement sample with tap water. Wash the sample for 1 minute each time, remove the moisture on the surface with gauze, and
Measured in an atmosphere of 3°C and 55% relative humidity. In addition, a static honest meter manufactured by Shishido Shokai was used for the measurement.
Measure the charged voltage decay time (half-life). The evaluation criteria are:
Half-life less than 2 seconds...The antistatic effect is good; half-life 2 seconds or more...The antistatic effect is poor.

[0018]

[Table 1]

[0019]

[Effects of the Invention] The product of the present invention has improved antistatic function compared to a product using only components (B) and (C) in addition to component (A). especially,

As shown in [Table 1], the washing resistance of the molded product has significantly improved, and even after washing 50 times, there is almost no change in half-life, indicating that it maintains excellent conductivity and remains stable. ing. By blending the polyamide resin of the (D) component, the affinity of the (B) and (C) components for the (A) component is increased. This suppresses elution, and the water absorbing properties of the polyamide group also contribute.

This property means that antistatic products such as IC trays and magazines, and products that require washing with water, such as storage containers for semiconductor-related products, retain the same function (antistatic property) even after washing with water, and are semi-permanent. It maintains water wash resistance. Of course, the resulting molded product can be colored as desired by adding a coloring agent, making it easy to produce colorful molded products.

Claims (1)

[Claims] Claim 1: Based on 100 parts by weight of (A) polyolefin resin and/or polystyrene resin, (B) metal of group (1) and/or group (2) of the periodic table and/or the metal thereof. One or more types of salt from 0.01 to
15 parts by weight, (C) 0.5 to 0.5 parts by weight of polyhydric alcohol compound
20 parts by weight, (D) 2 to 90 parts by weight of polyamide resin,
A washable and antistatic resin composition characterized by blending the above three components (B), (C), and (D).