JPH11323070A - Resin composition for interior automotive trim having excellent destaticizing property and fogging preventing property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition capable of producing a molding product having excellent fogging preventing properties while having destaticizing properties enough to prevent the adhesion of dirt and dust by including a specific propylene/ethylene block copolymer, talc, a specific antistatic agent, etc., in a specific ratio. SOLUTION: This composition comprises a mixture composed of 100 pts.wt. of the total of (A) 30-82 pts.wt. of a propylene/ethylene block copolymer part containing 5-20 wt.% of a propylene/ethylene random copolymer having 25-75 wt.% ethylene content, (B) 10-40 pts.wt. of talc and (C) 8-30 pts.wt. of an olefin- based elastomer such as an ethylene-octene copolymer rubber or the like in which the total of the components B and C is 20-60 pts.wt. and (D) 0.3-0.45 wt.% based on the composition of an antistatic agent composed of a mixture of a monoglycerol fatty acid ester, a diglycerol fatty acid ester and an alkyldiethanolamine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for an automobile interior material having excellent antistatic properties and antifogging properties on window glass.

[0002]

2. Description of the Related Art Automobile interior parts such as instrument panels, console boxes, pillars, and trims are composite polypropylene resins made of polypropylene, talc, and elastomers in terms of weight reduction, cost reduction, ease of molding, and performance. Is commonly used. However,
Since polypropylene resin is a poor conductor of electricity, static electricity generated at the time of molding processing is not easily eliminated, and therefore, it has a defect that dust and dirt adhere to the resulting molded product.

[0003] For this reason, a method of preventing static electricity by generally blending a polypropylene resin with an antistatic agent such as glycerin monofatty acid ester, fatty acid diethanolamine, or alkyldiethanolamine is generally used. However, these antistatic agents cause severe bleeding of the surface of the molded article, and the bleeding antistatic agent volatilizes and evaporates and adheres to the glass window of a nearby automobile, and fogging occurs on the glass window, that is, fogging or haze. And there is a problem that visibility at the time of riding in a car is significantly impaired. An antistatic agent capable of exhibiting sufficient antistatic properties without deteriorating fogging properties has not been developed at present, and for parts close to window glass, which particularly dislikes fogging, an antistatic agent-free material At present, it is being dealt with by using such as.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have intensively studied to solve the above problems. As a result, monoglycerin fatty acid ester, diglycerin fatty acid ester,
When a molded article is formed using a resin composition in which an antistatic agent comprising a mixture with an alkyldiethanolamine, a propylene / ethylene block copolymer, talc and an olefin elastomer are blended in a specific mixing ratio, an antistatic property and an anti-fogging property are obtained. It was found that a molded article excellent in both cases was obtained, and based on this finding, the present invention was completed.
As is apparent from the above description, an object of the present invention is to provide a molded article having an antistatic property sufficient to prevent adhesion of dust and dust when formed into a molded article, and also having excellent anti-fogging properties. Is to provide a resin composition for an automobile interior material which can be obtained.

[0005]

(1) The ethylene content is 2
30 to 82 parts by weight of a propylene / ethylene block copolymer (component A) containing 5 to 75% by weight of a propylene / ethylene random copolymer part, 10 to 40 parts by weight of talc (component B); The olefin elastomer (component C) is composed of 8 to 30 parts by weight in total of 100 parts by weight, and the total of the components B and C is 20 to 60 parts by weight.
To a mixture which is parts by weight, an antistatic agent (component D) composed of a mixture of a monoglycerin fatty acid ester, a diglycerin fatty acid ester, and an alkyldiethanolamine,
A resin composition for automotive interior materials having excellent antistatic properties and anti-fogging properties, characterized in that it is incorporated in an amount of 0.3 to 0.45% by weight based on the composition.

[0006]

DETAILED DESCRIPTION OF THE INVENTION Component A used in the present invention is a propylene / ethylene / propylene random copolymer having an ethylene content of 25 to 75% by weight.
It is an ethylene block copolymer. Such a block copolymer can be obtained as follows. For example, propylene is polymerized in the presence of a Ziegler-Natta catalyst, and then propylene and the propylene and ethylene are subjected to two or more polymerization steps in which propylene and ethylene are copolymerized so that the ethylene content becomes a predetermined amount. And a propylene / ethylene block copolymer containing 5 to 20% by weight of a propylene / ethylene random copolymer part having an ethylene content of 25 to 75% by weight. Commercial products can also be used.

[0007] The talc of the component B is a general talc used by being added to a synthetic resin or the like, and there is no particular limitation on the particle size and the like. Further, the olefin elastomer of the component C is
Ethylene-propylene copolymer rubber, ethylene-butene copolymer rubber, ethylene-octene copolymer rubber, ethylene-hexene copolymer rubber can be used, and these are available as commercial products, for example, ethylene-propylene EP02 manufactured by Nippon Synthetic Rubber Co., Ltd. as a copolymer rubber
P, ethylene-butene copolymer rubber, TAFMA-A4085 (trademark) manufactured by Mitsui Petrochemical Industries, Ltd .;
Examples of octene copolymer rubber include Engege 8452 (trademark) manufactured by Dupont Dow Chemical Co., Ltd., and examples of ethylene-hexene copolymer rubber include Tuffma-H430 (trademark) manufactured by Mitsui Petrochemical Industries, Ltd. Can be.

The component D used in the present invention is an antistatic agent comprising a mixture of a monoglycerin fatty acid ester, a diglycerin fatty acid ester, and an alkyldiethanolamine. 55% by weight, 40 to 60% by weight of diglycerin fatty acid ester and 3 to 10% by weight of alkyldiethanolamine. Commercial products such as Anstec SP-151 (trademark, Toho Chemical Industry Co., Ltd.) )).

[0009] The resin composition of the present invention may contain, if necessary, an antioxidant usually added to a polyolefin resin,
An ultraviolet absorber, a nucleating agent, a pigment and the like can be appropriately compounded.

[0010]

Next, the present invention will be described with reference to examples, but the present invention is not limited to the examples. Note that the embodiment,
The evaluation method used in the comparative example was as follows. (1) Evaluation of antistatic property After leaving the produced molded article at 23 ° C. and a humidity of 50% for 7 days, R8340A type manufactured by Advantest Co., Ltd.
The surface resistivity was determined using a super insulation meter. here,
The specific surface resistance value effective for preventing the adhesion of dust and dust to the molded product is 1 × 10
¹³ (Ω) or less.

(2) Evaluation of anti-fogging property The formed article was left for 24 hours under the condition of 23 ° C. and 50% humidity, and 50 mm × 50 mm × 2 mmt
One piece was cut out and used as a sample for fogging evaluation. The fogging property was evaluated using a window screen fogging tester WSF-2 manufactured by Suga Test Instruments Co., Ltd.
Glass container heating temperature 100 ° C, glass plate cooling temperature 2
The evaluation was performed at 0 ° C. for a heating time of 20 hours. After the heat treatment, the glass plate with fogging is taken out, and
After leaving for 1 hour at 50 ° C. and a humidity of 50%, the total light transmittance Tt and the scattered light transmittance Td of the glass plate were measured using an integrating sphere light transmittance measuring device. The degree (%) was measured, and the anti-fogging property was evaluated. The glass plate used in this measurement had a glass haze of 0.2% or less in a clean state. Here, the fogging property without hindering the visibility at the time of riding in a car was set to be less than 10% in glass haze.

Examples 1 to 9, Comparative Examples 1 to 9 In Examples 1 to 9 and Comparative Examples 1 to 9, the component A had an ethylene content of 50% by weight and a propylene / ethylene random copolymer content of 8%. % By weight of propylene / ethylene block copolymer, and talc of component B was LMS-200 (trade name, manufactured by Fuji Talc Co., Ltd.)
Is obtained by mixing Engage 8452 (trademark) which is an ethylene-octene copolymer rubber manufactured by DuPont Dow Chemical Co., Ltd. Is an anti-static agent manufactured by Toho Chemical Industry Co., Ltd.
1 (trademark), these materials were stirred and mixed at the ratios shown in Table 1 below, and were melted, kneaded, and granulated at a resin temperature of 200 ° C. with a 50 mmφ extruder. The obtained granular resin composition was molded using a 150 t molding machine manufactured by Meiki Co., Ltd. to obtain a molded product having a size of 100 mm × 100 mm × 2 mmt.
Was injection molded at a resin temperature of 220 ° C., and the antistatic properties and antifogging properties were evaluated using each of the obtained flat plates. The results are shown in Table 1 below.

The molded articles obtained by using the resin compositions shown in Examples 1 to 9 have excellent antistatic properties and antifogging properties, and are most suitable as resin compositions for automotive interior materials. You can see that. In Comparative Examples 1 to 7, since the mixing ratio of the talc of the component B and the olefinic elastomer of the component C was out of the range specified in the present invention, the effect of the antistatic agent was poor, and the adhesion of dirt and dust to the molded product was poor. It is found that the resin composition is not suitable as a resin composition for automotive interior materials because of the generation of In Comparative Example 8, the mixing ratio of the talc of the component B and the olefin-based elastomer of the component C was within the range of the present invention, but the ratio of the component D exceeded the range specified in the present invention. It shows that the resin composition has poor properties and fogging occurs in the window glass, and thus is not suitable as a resin composition for automotive interior materials.

Further, in Comparative Example 9, the mixing ratio of the talc of the component B and the olefin elastomer of the component C is within the range of the present invention, but the mixing ratio of the antistatic agent of the component D is within the range specified in the present invention. Since the amount is smaller, the antistatic performance is not exhibited, and dust and dust are attached to the molded product, which indicates that the resin composition is unsuitable as a resin composition for automotive interior materials. Comparative Example 10 is an example in which a propylene homopolymer resin was used as Component A, but when a propylene homopolymer resin was used, Component B, Component C, and Component D were within the range specified in the present invention. In spite of the fact, the antistatic performance is insufficient, so that dust and dirt are attached to the molded product, which is unsuitable as a resin composition for automotive interior materials.

[0015]

The resin composition of the present invention, when formed into a molded product, has an antistatic property sufficient to prevent the adhesion of dust and dirt on the molded product, and prevents the occurrence of fogging on the window glass of automobiles. In addition, it has an anti-fogging property and is most suitable as a resin composition for automotive interior materials.

[0016]

[Table 1]

Claims (1)

[Claims] 1. A propylene / ethylene block copolymer (component A) containing 5 to 20% by weight of a propylene / ethylene random copolymer part having an ethylene content of 25 to 75% by weight, talc (a component) B) 10 to 40 parts by weight and an olefin-based elastomer (component C) 8 to 3
Antistatic consisting of a mixture of monoglycerin fatty acid ester, diglycerin fatty acid ester and alkyldiethanolamine in a mixture consisting of 0 parts by weight in total of 100 parts by weight and the total of component B and component C being 20 to 60 parts by weight. Agent (component D) in an amount of 0.3 to 0.45 based on the composition;
A resin composition for automotive interior materials having excellent antistatic properties and anti-fogging properties, characterized by being blended in a weight percentage.