JPH0741652A - Polyester blow molded body - Google Patents

Abstract

PURPOSE:To obtain the subject readily handleable molded body, capable of rapidly attenuating the electrification in a small quantity of the electrification with hardly any sticking of dust and useful as a bottle, etc., for a carbonated beverage by blow molding a composition composed of a specific polymer and regulating the surface resistivity and electrified voltage to specific values or below. CONSTITUTION:This polyester blow molded body is obtained by molding a composition composed of (A) 100 pts.wt. polyester containing ethylene terephthalate as a principal recurring unit and (B) 5-50 pts.wt. polyether amide. The surface resistivity in the body part of the blow molded body is <=10<13>OMEGA/square and the electrified voltage just after rotating the molded body for 5min with a rotary static tester is <=500V. Furthermore, the component (B) of the molded body is preferably a block copolymer of a polyether component and a polyamide component at (80/20) to (20/80) weight ratio of the (polyether component/polyamide component). The polyether component is preferably polyoxyethylene and the polyamide component is preferably nylon 6 or nylon 66.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow polyester molded product, and more particularly to a hollow polyester molded product having less dust and excellent in antistatic property.

[0002]

2. Description of the Related Art Polyester is widely used in fibers, films, bottles, industrial resins and the like because of its excellent mechanical, physical and chemical properties. In particular, the amount of bottles used for carbonated drinks and detergents has rapidly expanded in recent years.

However, while polyester is originally excellent in electrical insulation, it is easily charged with static electricity, and dust is attached to it, impairing its appearance and causing trouble in use.

Various methods have been proposed so far for improving the antistatic property of polyester. For example, JP-A-53-149246, JP-A-53-1492
No. 47, JP-A No. 54-1362, etc., disclose a composition in which an inert polyoxyalkylene ether (polyalkylene glycol) and an alkyl sulfonic acid metal salt are mixed in a polyester. However, although these fibers have excellent antistatic properties as fibers, they do not exhibit sufficient effects as they are for molded articles having a small specific surface area such as bottles.

For hollow moldings, a combination of a metal salt of alkylbenzene sulfonic acid and diethylene glycol or polyethylene glycol (for example, JP-A-55-3426).
No. 55-5914, etc.) are known. But,
This product easily forms an insoluble substance in the polymer, and impairs the appearance of the molded product. Blow hollow moldings containing a polyether ester amide or a glycidyl group-containing olefin copolymer are known (for example, JP-A-4-296525 and JP-A-5-38747). However, although these have a shorter half-life in which the charged electricity is attenuated, they have a drawback that the amount of charge itself is high. A hollow molded article using a polyetherester block copolymer is also known (for example, Japanese Patent Laid-Open No. 4-3).
No. 12830), although it is well mixed with polyester, the antistatic performance itself is insufficient. Aside from this, a technique is also known in which a small amount of an alkylsulfonic acid metal salt and a styrene oligomer are blended for the purpose of preventing the contents from being blown out when the carbonated beverage container is opened (for example, JP-A-60-42452). issue). However, this technology is insufficient from the viewpoint of antistatic performance. In addition, antistatic modifiers include, for example, JP-A-60-243.
Although there are many documents other than No. 134, it is unavoidable that they are not practical because they have drawbacks such as heat resistance, and low molecular weight ones have drawbacks such as bleeding.

[0006]

DISCLOSURE OF THE INVENTION The inventors of the present invention intend to provide a polyester hollow molded article which is not decomposed during melt molding and is free from leaching, coloring, foreign matter and the like and having excellent antistatic properties. Is.

[0007]

That is, the present invention is a blended polymer containing 5 to 50 parts by weight of polyether amide with respect to 100 parts by weight of a polyester containing ethylene terephthalate as a main repeating unit. The surface resistivity is 10 ¹³ Ω or less, and the electrification voltage after rotating for 5 minutes with a rotary static tester is 5
The polyester hollow molded article is characterized by having a voltage of 00 V or less.

In the present invention, the polyester means a polyester having ethylene terephthalate as a main repeating unit. Mainly here means occupying 85 mol% or more. That is, a technique containing 15 mol% or less of the third component is a technique to which the present invention can be applied.

Examples of the third component which can be copolymerized include dicarboxylic acids other than terephthalic acid and ethylene glycol constituting the polyester, diols and oxycarboxylic acids. Specifically, naphthalene dicarboxylic acid, diphenyl dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenyl ketone dicarboxylic acid, diphenoxyethane dicarboxylic acid, isophthalic acid, diphenyl sulfone dicarboxylic acid, sodium-sulfoisophthalic acid,
Dibromoterephthalic acid and the like; alicyclic dicarboxylic acids such as decalin dicarboxylic acid, tetralin dicarboxylic acid,
Hexahydroterephthalic acid, etc .; aliphatic dicarboxylic acids,
Examples thereof include malonic acid, succinic acid, adipic acid, sebacic acid and the like. Examples of the glycol component include aliphatic diols such as trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, diethylene glycol and triethylene glycol; aromatic diols such as catechol, naphthalene diol, resorcinol and 4,4 ′. -Dihydroxy-diphenyl-sulfone, bisphenol A
([2.2'-bis (4-hydroxyphenyl) propane]), tetrabromobisphenol A, bishydroxyethoxybisphenol A, etc .; alicyclic diol, such as cyclohexanediol; aliphatic oxycarboxylic acid, such as glycolic acid, Hydroacrylic acid, 3-oxypropionic acid and the like; alicyclic oxycarboxylic acid such as asiatic acid, quinobaic acid and the like; aromatic oxycarboxylic acid such as salicylic acid, m-oxybenzoic acid, p-oxybenzoic acid and mandelic acid Atrolactic acid and the like can be mentioned.

Further, within the range where the polyester is substantially linear, a polyfunctional compound having a valence of 3 or more, such as glycerin,
Trimethylolpropane, pentaerythritol, trimellitic acid, trimesic acid, pyromellitic acid, tricarballylic acid, gallic acid and the like may be copolymerized. If necessary, a monofunctional compound such as o-benzoylbenzoic acid,
Naphthoic acid or the like may be added.

In the present invention, the polyether amide is
Polyether component mainly composed of aliphatic polyether,
It is a block copolymer composed of an aliphatic polyamide component. Examples of the aliphatic polyether include polyoxyalkylene glycols such as polyoxyethylene glycol, polyoxypropylene glycol, a compound obtained by adding ethylene oxide to both ends of bisphenol A, a compound obtained by adding ethylene oxide to both ends of bisphenol S, or a compound thereof. Examples of the copolymer include polyoxyethylene glycol having a molecular weight of the polyether component of 500 to 5,000. As the aliphatic polyamide, nylon 6, nylon 66, nylon 11,
Examples include nylon 12 and nylon 46. Of these, nylon 6 and nylon 66 are preferable.

In the polyether amide, the composition ratio of the polyether component and the polyamide component is preferably in the range of 80/20 to 20/80 in terms of weight ratio. Compatibility with polyester is not always good, but higher polyether weight ratio is slightly better, and the preferred range is 70/30.
-40/60.

In the present invention, polyether amide is blended in an amount of 5 to 50 parts by weight per 100 parts by weight of polyester. It is preferably 8 to 45 parts by weight.

In the present invention, the hollow molded article means a container obtained by injection molding, a bottle obtained by orientation-blowing it, an extrusion-molded article, and bottles obtained by direct blowing.

The hollow molded article has a surface resistance of 1 KV.
10¹³Ω / □ or less, preferably 10 ¹²Ω / □ or less
And 5 minutes with a rotary static tester
Charged voltage after switching is 500V (volt) or less, preferred
Or less than 200V.

[0016]

INDUSTRIAL APPLICABILITY The hollow molded article according to the present invention has a low charge amount itself, has a rapid charge decay, does not have a bad influence of static electricity, is easy to handle, and has little dust adhesion.

[0017]

EXAMPLES The present invention will be specifically described below with reference to examples. In the examples, "parts" represent parts by weight, and the methods for measuring the properties used in the examples are as follows.

(1) Intrinsic viscosity [η] The polyester was calculated from the solution viscosity measured at 35 ° C. using a mixed solvent of phenol / tetrachloroethane (weight ratio 60/40).

The polyetheramide was calculated from the solution viscosity measured at 35 ° C. using formic acid as a solvent.

(2) Surface specific resistance Polyester / polyether amide are mixed at a predetermined ratio and an injection molding machine M-100DM manufactured by Meiki Seisakusho is used.
After molding 50 g of preform at a cylinder temperature of 285 ° C., it was blow-stretched into a 1500 cc bottle. Cut out the straight body part of the bottle and cut it at 23 ° C, 60
After humidity was adjusted at% RH for 24 hours, it was measured at an applied voltage of 1 KV using a Toa Denpa Kogyo super insulation meter (model SM-10E).

(3) Charge voltage The sample of the straight body cut out from the bottle was subjected to humidity control under the same conditions and then charged for 5 minutes using a rotary static tester (Model Model RST-201) manufactured by Koa Shokai. Was measured.

[0022]

Examples 1 to 7 and Comparative Examples 1 to 3 TR-8550T ([η] = 0.76) manufactured by Teijin Limited was used as polyester.
Various polyether amides shown in Table 1 were used, and a mixture of the two at a predetermined ratio was molded into a bottle. The antistatic performance of the body was shown in the right column of the table.

[0023]

[Table 1]

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area C08L 77:00)

Claims (4)

[Claims] 1. A hollow molded article obtained by molding a composition comprising 100 parts by weight of a polyester containing ethylene terephthalate as a main repeating unit and 5 to 50 parts by weight of a polyether amide, wherein the hollow molded article has a body. A polyester hollow molded article having a surface specific resistance of 10 ¹³ Ω / □ or less and a charged voltage of 500 V (volt) or less immediately after being rotated for 5 minutes using a rotary static tester. 2. The polyether amide is a block copolymer, and the weight ratio of polyether component / polyamide component is in the range of 80/20 to 20/80.
The polyester hollow molded article described in 1. 3. A polyester hollow molded article containing a polyether amide according to claim 2, wherein the polyether component is polyoxyethylene glycol and the polyamide component is nylon 6. 4. A polyester hollow molded article containing a polyether amide according to claim 2, wherein the polyether component is polyoxyethylene glycol and the polyamide component is nylon 66.