JPH01263135A - Antistatic agent for polyolefin resin - Google Patents

Abstract

PURPOSE:To obtain the title preventing agent containing a compound of glycerin fatty acid ester expressed by a specific formula, having a compound having a specific substituent group and glycerin monofatty acid ester in a definite content and being excellent in offset printability. CONSTITUTION:The aimed preventing agent containing two or more kind of glycerin fatty acid esters expressed by formula I (A1, A2 and A3 are H or formula II: R is 9-21C alkyl or alkenyl, provided that A1, A2 and A3 are not simultaneously H) and being >=40% in the content of a compound wherein R is 11-15C alkyl or alkenyl and 40-90% in the content of glycerin monofatty acid ester. Furthermore, the aimed preventing agent is preferably added to a polyolefin resin at an amount of 0.04-0.4wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antistatic agent for polyolefin resins having excellent suitability for offset printing.

Polyolefin resin is strong, lightweight, has excellent water resistance, chemical resistance, and electrical insulation, and is easy to mold, so it is widely used in electrical equipment materials, building materials, vehicle materials, household goods, etc. ing. Although polyolefin resins have excellent electrical insulation properties, they tend to be charged and accumulate static electricity, which often causes various problems and disasters.

In general, plastic products attract dust in the air due to static electricity, and are extremely susceptible to contamination (this can significantly reduce the commercial value of molded products, and there are also major problems such as ignition of flammable gases and explosions due to discharge sparks) Polyolefin resins are particularly susceptible to static electricity, which often limits their applications in various fields.

As a method for improving the charging properties of polyolefin resins, it is common practice to add antistatic agents to the resins, apply conductive paints to the surfaces of molded products, and the like.

Known antistatic agents for polyolefin resins include polyoxyethine alkylamine fatty acid esters, alkyl jetanolamines, and glycerin fatty acid esters. However, internal addition of these antistatic agents to polyolefins makes offset printing difficult. When performing offset printing, a polyolefin sheet is subjected to corona discharge treatment, an anchor coating agent is applied to the printing surface, and the anchor coating agent is cured by ultraviolet irradiation before printing is performed. However, polyolefin resin containing an antistatic agent is used. However, there are drawbacks such as peeling of the anchor coating agent and misalignment of the printing ink. For this reason, printing on polyolefin resins containing antistatic agents is limited to silk screen printing using epoxy resin inks. However, silk screen printing has low precision and the designs are limited.
Multicolor stamp for single color printing,! ! In the case of +1 printing, it is necessary to repeat printing for each color, resulting in low productivity and an economic disadvantage. On the other hand, offset printing has a fast printing speed, easy process control, and is durable, so it can be printed in large quantities and can overcome the drawbacks of silk screen printing. For this reason, there is a demand for the development of an antistatic agent that does not cause deterioration in offset printing performance even when added to polyolefin resins.

The present invention is based on the general formula % (where A1, A2 and A3 may be the same or different and represent a hydrogen atom or a group -C-R, where R is an alkyl group having 9 to 21 carbon atoms). or an alkyl group, except when A1, A2 and A3 are hydrogen atoms at the same time), and R is an alkyl group having 11 to 15 carbon atoms or , Yo Ayagayu 7. The content of the base compound is 4%
This is an antistatic agent for polyolefin resin having excellent suitability for offset printing, which is characterized in that the content of glycerin monofatty acid:r-stell is 40 to 90%.

By adding the antistatic agent of the present invention, it is possible to produce a polyolefin resin that is capable of offset printing and has excellent antistatic properties.

The polyolefin resin to which the antistatic agent of the present invention is added has excellent transparency, and even when used in combination with a nucleating agent, the transparency is not impaired.

Examples of the glycerin fatty acid ester which is the main component of the antistatic agent of the present invention include the following compounds. Glycerin monocaprate, glycerin capriate, glycerin tricaprate, glycerin monolaurate, glycerin capriate, glycerin trilaurate, glycerin monomyristate, glycerin cimyristate, glycerin trimyristin Acid ester, glycerin monobalmitate, glycerin civalmitate, glycerin tribalmitate, glycerin monooleate, glycerin dioleate, glycerin trioleate, glycerin monostearate, glycerin distearate ester, glycerin tristearate, glycerin monobehenate,
Glycerine dibehenate, glycerine tribehenate, glycerine monoerucate, glycerine dierucate, glycerine trierucate, etc. Two or more of these compounds are used.

Examples of the glycerin fatty acid ester in which R is an alkyl group or alkenyl group having 11 to 15 carbon atoms include lauric acid ester, valmitic acid ester, myristic acid ester, and the like. The content of these compounds is 4
It is 0% or more, preferably 50% or more. The content of glycerin monofatty acid ester is 40 to 90%, preferably 50 to 80%. If the content of glycerin fatty acid ester or the content of glycerin monofatty acid ester in which R is an alkyl group or alkenyl group having 11 to 15 carbon atoms is outside the above range, sufficient charging performance may not be obtained even when added to the polyolefin resin. Either it is not obtained or its addition reduces offset printing performance.

The antistatic agent of the present invention preferably consists of 40 to 90% glycerin monofatty acid ester and 60 to 10% glycerin di- or trifatty acid ester, and does not contain additives or other antistatic agents. The antistatic agent of the present invention comprises 2
It can be produced by mixing more than one glycerin fatty acid ester.

Examples of the polyolefin resin to which the antistatic agent of the present invention is added include polyethylene, polypropylene, ethylene-propylene copolymer, polybutylene-1, polypentene-1, ethylene-propylene-butylene copolymer, and two or more thereof. A mixture of is used. These polyolefin resins may contain heat stabilizers, colorants, weathering stabilizers (ultraviolet absorbers, etc.), nucleating agents, crosslinking agents, fillers, and other additives.

The amount of the antistatic agent of the present invention added is 0.01 to 0.5%, preferably 0.04 to 0.5%, based on the weight of the polyolefin resin.
It is 0.4%. If the amount added is less than this, the antistatic effect will be insufficient, and if it is more than this, peeling of the anchor coating agent, misalignment of the printing ink, etc. will occur.

To produce the polyolefin resin containing the antistatic agent of the present invention, the antistatic agent and other additives as necessary are added to the polyolefin resin (resin pellet or powder), mixed in a blender, and then extruded using a screw type. They may be melted and mixed using a machine, Banbury mixer, mixing roll, etc.Also, injection molding, extrusion molding, etc. can be performed after mixing the polyolefin resin and the antistatic agent with a Henschel mixer.The present invention The antistatic agent may be made into a masterbatch and added to the polyolefin resin.

The polyolefin resin containing the antistatic agent of the present invention is
It can be formed into shapes such as sheets, films, plates, etc. These molded products (-!.

It can be used for electrical equipment materials, construction materials, inch 1 Noah products, vehicle materials, miscellaneous goods, etc.

Test example Commercially available polypropylene resin (pp) and propylene
Ethylene co-X combination, (PPE, ethylene content 2.5
%) and the antistatic agent and nucleating agent shown in Table 1 were added to prepare a sheet. After corona discharge treatment of this sheet, an anchor coating agent (manufactured by Toyo Ink Manufacturing Co., Ltd.) is applied, the anchor coating agent is cured by irradiation with ultraviolet rays, and dry offset printing is performed using offset printing ink (manufactured by Toyo Ink Manufacturing Co., Ltd.). Offset printing was performed using a printing machine.

Table 2 shows the evaluation results of the antistatic effect and printing suitability of the obtained printed sheets.

The half-life and surface resistivity values in the table are based on the static honest meter manufactured by Sagetsu Shokai and the 5M-5M manufactured by Toa Denpa Kogyo Co., Ltd.
It was measured using a 5E type super megohmmeter. The peeling state of the anchor coating agent was examined by a pencil scratch test, a base grain test, and a sellotape pressure sensitive test according to JISK-5400. Printability was evaluated by observing ink misalignment, bleeding, and finished condition. The nucleating agent used is EC- manufactured by Easy Kasho Kogyo Co., Ltd.
4 was used.

Table 1

Claims (1)

[Claims] General formula▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, A_1, A_2, and A_3 may be the same or different, and hydrogen atoms or groups▲There are mathematical formulas, chemical formulas, tables, etc.▼ , where R means an alkyl group or alkenyl group having 9 to 21 carbon atoms, except when A_1, A_2 and A_3 are hydrogen atoms at the same time). The content of the compound in which R is an alkyl group or alkenyl group having 11 to 15 carbon atoms is 40% or more, and the content of glycerin monofatty acid ester is 40 to 90%. An antistatic agent for polyolefin resins with excellent offset printing suitability.