JPS61264033A - Polyethylene resin composition - Google Patents

Abstract

PURPOSE:To provide a polyethylene resin composition containing an ethylenic polymer and a higher aliphatic alcohol and capable of giving a film having improved gloss without lowering the transparency and mechanical strength, etc., even without using a drawing process. CONSTITUTION:The objective composition can be produced by compounding (A) 100pts.(wt.) of an ethylenic polymer, preferably a high-density polyethylene, a linear low-density polyethylene or a low-density polyethylene having a density of >=0.915g/cm<3> and a melt index of 0.5-3g/10min with (B) 0.01-5pts., preferably 0.05-1pt. of a higher aliphatic alcohol, preferably a 12-30C alcohol, especially a 12-20C alcohol such as stearyl alcohol, cetyl alcohol, myristyl alcohol, lauryl alcohol, etc., and if necessary, (C) various additives such as antistatic agent, dispersing agent, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a polyethylene resin composition, and more specifically, the present invention relates to a polyethylene resin composition. The present invention relates to a polyethylene resin composition that can be molded into a film.

[Prior Art and its Problems] Polyethylene has excellent cold resistance, chemical resistance, processing properties, etc., and also has few hygienic problems due to residual monomers. For this reason, polyethylene is widely used after being processed into food packaging films, liquid detergent containers, and the like.

Among these, polyethylene films are obtained by inflation molding, T-die method, calendar processing method, etc. For example, high-density polyethylene film obtained by inflation molding has a gloss of 40 (JIS
K7105 compliant).

Therefore, in order to further improve the gloss of polyethylene film, a method of adding a stretching step is conventionally known.

However, adding a stretching process requires new equipment, which inevitably increases product costs.

This invention has been made based on the above circumstances.

That is, an object of the present invention is to provide a polyethylene resin composition that can be molded into a film having improved gloss without any special equipment such as stretching equipment and without impairing transparency, mechanical strength, etc. The purpose is to

[Means for solving the above-mentioned problems] In order to achieve the above-mentioned object, as a result of intensive research by the present inventor, it was found that when a predetermined amount of higher aliphatic alcohol is blended into an ethylene polymer, there is no need to particularly provide a stretching step. The inventors have also discovered that it is possible to obtain a polyethylene film with excellent gloss, and that the polyethylene film exhibits no decrease in transparency, mechanical strength, etc., and has thus arrived at the present invention.

That is, the outline of the present invention for solving the above problems is as follows: 100 parts by weight of an ethylene polymer and 0 parts by weight of a higher aliphatic alcohol.
．． 01 to 5-0 parts by weight.

As the ethylene polymer, ethylene homopolymers and copolymers of ethylene and other vinyl monomers can be used, such as high-density polyethylene, low-density polyethylene, and ethylene polymers. (1)-1-1 is mentioned, especially when the density is 0.
915 g/cm″ or more, melt index (
Hereinafter, it may be referred to as MI. ) is 0.5-3g71
High density polyethylene L/7 with a density of 0.915~
0.939 g/cm″ and MI 0.5-3g
/10 min, and a density of 0.1115-0.839 g/c rn', M
Low density polyethylene with an I of 0.5 to 3g710min is preferred.

As the higher aliphatic alcohol, for example, an alcohol having 12 to 30 carbon atoms can be suitably used.

Examples of such higher aliphatic alcohols include dodecanol-1 (lauryl alcohol), dodecanol-2, tridecanol-1°tridecanol-2, tetradecanol-1 (myristyl alcohol), and tetradecanol-2° pentadecanol. -1, pentadecanol-2゜hexadecanol-1 (cetyl alcohol),
hexadekaryl-2, heptadecanol-1, hetearyl alcohol), octadecanol-2゜nonadecanol-1, nonadecanol-2, eicosanol-1 (
Arachyl alcohol), eicosanol-2, heneicosanol, docosanol (behenyl alcohol), tricosanol, tetracosanol (carnabil alcohol), pentacosanol, hexacosanol (seryl alcohol), heptacosanol, octacosanol (
Saturated alcohols such as colyanyl alcohol), nonacosanol, triacontanol (myricyl alcohol), hexadecane-1,2-diol, octadecane-
Examples include dihydric alcohols such as 1,2-diol, eicosane-1,2-diol, tocosane-1,2-diol, and tetracosane-1,2-diol. 'Among these various higher fatty acid alcohols, those with a carbon number of 1
Alcohols having a molecular weight of 2 to 20 are preferred, and particularly preferred are sunalyl alcohol, cetyl alcohol, myricyl alcohol, lauryl alcohol, and the like.

In this invention, the various alcohols mentioned above can be used alone, or two or more kinds of alcohols can be used in combination.

The blending ratio of the ethylene polymer and the higher aliphatic alcohol is such that the higher aliphatic alcohol is 0.0 parts by weight per 100 parts by weight of the ethylene polymer. O1 to 5.0 parts by weight, preferably 0.05 to 1.0 parts by weight, and more preferably 0.05 to 0.5 parts by weight.

If the amount of the higher aliphatic alcohol is less than 0.01 parts by weight, the gloss improvement effect of the ethylene polymer film will be low, and if it exceeds 5.0 parts by weight, the gloss improvement effect will not be improved. , it will actually cause bleed.

The polyethylene resin composition according to the present invention is formed by blending the ethylene polymer and the higher aliphatic alcohol, and may optionally contain an antistatic agent, a dispersant, and a mold release agent. , flame retardants, antioxidants, plasticizers, heat stabilizers, and other various additives can be added and blended.

As the antistatic agent, various surfactants such as alkylamines, alkyl fatty acid esters, and glycerin esters can be used. Further, as the dispersant, for example, stearic acid, a metal salt of stearic acid, etc. can be used. As a mold release agent, for example, a fatty acid amide such as oleic acid amide can be used. Examples of the flame retardant include inorganic antimony oxide, zirconium oxide, etc., and organic phosphoric acid ester, tricresyl phosphate, etc.

As the antioxidant, triazole-based, salicylic acid-based, and acrylonitrile-based antioxidants are used. Further, examples of the plasticizer include phthalic acid diester, butanol diester, phosphoric acid diester, and the like.

There is no particular restriction on the method of blending the polyethylene polymer, the higher aliphatic alcohol, and, if necessary, the various additives. For example, all the components may be premixed, and the resulting premix may be kneaded. According to the method, it is possible to provide a film in which the above-mentioned components are mixed and kneaded at the same time.

Examples include methods.

The mixing and kneading may be carried out using, for example, a ribbon blender, a tumble mixer, a Henschel mixer, etc., and the kneading may be carried out using an oven roll, a panburi mixer, a single screw extruder, a twin screw single extruder, a kneader, etc. can.

The polyethylene resin composition obtained in this way is
It is suitably formed into a film by an extrusion method such as a T-die method or an inflation method, or a calender method.

[Effects of the Invention] According to the present invention, (1) A film with excellent gloss, a luxurious feel, and high commercial value can be formed without stretching. Therefore, it is possible to provide a low-cost film with good gloss by eliminating the need for a stretching process.

(2) Regardless of the composition of higher aliphatic alcohol,
There was no decrease in transparency, haze or mechanical strength.

However, in this invention, by blending a predetermined amount of higher aliphatic alcohol, it is possible to improve the gloss of the film while maintaining the blending effect of the additive. .

[Example] Next, the present invention will be specifically illustrated by giving examples and comparative examples of the present invention.

(Example t-it, Comparative Examples 1 to 6) 100 parts by weight of the ethylene polymer shown in Table 1, higher aliphatic alcohol of the type and amount shown in Table 1, and optionally the amount shown in Table 1. Additives of different types and amounts were blended, and pellets were obtained using an extruder. Inflation molding machine [manufactured by Placo Co., Ltd., die diameter 100mmφ
], the die temperature was 210°C and the discharge amount was 20 kg/hour.

A film was formed from the pellets under the conditions of a film thickness of 0.02 mm and a film fold diameter of 350 mm, and as shown in Table 1, a polyethylene polymer made by blending a predetermined amount of an ethylene polymer and a higher aliphatic alcohol. The film has a much higher gloss level (60 or more) than the 40 gloss level of conventional polyethylene film, has no bleed-out of higher aliphatic alcohols, and has high mechanical properties such as film impact.

Furthermore, the ethylene polymer film blended with additives does not have a decrease in mechanical strength, and on the contrary, it is observed that the glossiness is improved. This is an effect of the present invention that could not be expected from the conventional technology.

Patent applicant: Idemitsu Petrochemical Co., Ltd. Agent
Patent Attorney Naoki Fukumura 0 [7

Claims (2)

[Claims] (1) A polyethylene resin composition containing 100 parts by weight of an ethylene polymer and 0.01 to 5.0 parts by weight of a higher aliphatic alcohol. (2) The polyethylene resin composition according to claim 1, wherein the higher aliphatic alcohol has 12 to 30 carbon atoms.