JPH0423853A - Display material for bottle - Google Patents

Abstract

PURPOSE:To obtain a display material, excellent in mechanical strength such as impact strength and optical properties such as transparency and suitable as cylindrical labels, etc., for various bottle containers such as plastic containers by blending a specific polyvinyl chloride-based resin with a plasticizer and inorganic substance powder in specified amounts. CONSTITUTION:A composition is obtained by blending (A) 100 pts.wt. polyvinyl chloride-based resin having 1300-3000 average polymerization degree with (B) 35-60 pts.wt. plasticizer (e.g. diisooctyl phthalate) and (C) 0.5-5 pts. wt. inorganic substance powder (e.g. amorphous silica or calcium carbonate). The above- mentioned composition is formed and used as a display material for bottles.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a soft polyvinyl chloride resin having excellent mechanical strength, particularly impact resistance, and a display material for bottles formed from the resin.

(Conventional technology) Traditionally, bottle containers such as glass and plastic (
Display materials such as a cap seal and a cylindrical label are attached to the bottle (hereinafter simply referred to as a bottle). For this.

1) Excellent optical properties such as transparency and gloss, and good printability; 2) Appropriate flexibility and rubber elasticity, and good adhesion to the bottle surface.

3) Excellent mechanical strength such as tensile strength, tear strength, and impact resistance in both vertical and horizontal directions; 4) Appropriate surface smoothness, excellent blocking resistance, and suitability for packaging machinery. Until now, heat-shrinkable films made of hard vinyl chloride resins have been widely used due to their excellent strength, transparency, suitability for packaging machines, and printability. However, when used on bottles with complex shapes, wrinkles tend to occur during heat packaging, and when used on soft plastic bottles that are easily deformed under pressure, the label may peel away from the bottle surface during long-term use. There were drawbacks such as the fact that it was easy to split apart.

Polyethylene stretch film is also used because it has excellent adhesion to the bottle surface, but this has the problem that the film's low strength makes the label easily scratched and damaged during transportation. there were.

(Problems to be Solved by the Invention) Therefore, the purpose of the present invention is to meet the various required characteristics described above,
In particular, it is an object of the present invention to provide a soft polyvinyl chloride resin from which display materials for bottles with excellent impact resistance can be obtained.

(Means for Solving the Problems) The present invention has been achieved as a result of intensive research in order to solve the above problems, and provides flexible polyvinyl chloride resins including l) a polyvinyl chloride resin having an average degree of polymerization of 1, 300 to 3,000; The gist is that 2) 35 to 60 parts by weight of a plasticizer and 3) 0.5 to 5 parts by weight of an inorganic substance powder are added to ioo parts by weight of a vinyl chloride resin.

To explain this, the polyvinyl chloride resin used as the main component in the present invention is a vinyl chloride homopolymer,
Or mainly made of vinyl chloride.

It may be a copolymer with a vinyl monomer copolymerizable with this vinyl monomer.

Vinyl esters such as vinyl acetate and vinyl propionate; Acrylic esters such as methyl acrylate and ethyl acrylate; Methacrylic esters such as methyl methacrylate and ethyl methacrylate; Olefins such as ethylene and propylene; Maleic anhydride Examples include acid, acrylonitrile, styrene, and vinylidene chloride, and these can be used alone or in combination of two or more.

This polyvinyl chloride resin has an average degree of polymerization of 1,300~
3,000, and the degree of polymerization is 1
If the degree of polymerization is less than 3,000, it has the disadvantage of poor rubber elasticity and low strength.If the degree of polymerization is more than 3,000, it is not only difficult to form the film, but also the thickness of the obtained film is inadequate. It becomes uniform and causes problems during printing.

The plasticizer used as the second component is one that is used in ordinary soft vinyl chloride resins and is not particularly limited. phthalate esters; adipic esters such as dioctyl adipate, diisodecyl adipate, and diisononyl adipate; sebacic esters such as dibutyl sebacate and dioctyl sebacate; epoxy esters such as epoxidized soybean oil and epoxy octyl stearate; adipine Examples include polyesters such as acid polyesters, and these may be used alone or in combination of two or more.

These plasticizers are used in an amount of 35 to 60 parts by weight based on 100 parts by weight of the polyvinyl chloride resin. If it is less than 35 parts by weight, the rubber elasticity will be poor, resulting in poor adhesion when attaching the label, poor adhesion to the bottle surface, etc. If it exceeds 60 parts by weight, the film will become too soft and various mechanical strengths will decrease. Therefore, it is undesirable.

The inorganic substance powder as the third component has the function of imparting appropriate surface smoothness, improving blocking resistance, and improving suitability for packaging machines. , talc, etc., and those having an average particle size of 0.1 to 5 and OIjM are used.

This inorganic powder is used in an amount of 0.5 to 5 parts by weight per 100 parts by weight of the polyvinyl chloride resin. If the amount is less than 0.5 parts by weight, the film becomes highly adhesive and blocks, making it difficult to open a label or the like when attaching it to a bottle, thereby impairing workability. Moreover, if it exceeds 5 parts by weight, the transparency of the film will be impaired, which is not preferable.

The flexible polyvinyl chloride resin film of the present invention is:

In addition to the above-mentioned components, if necessary, stabilizers such as maleate-based organotin compounds, impact modifiers such as MBS-based resins and NBR-based resins, and acrylic processing aids such as methylmethacrylic-based resins. , a lubricant, an ultraviolet absorber, etc. can be added as necessary.

These components may be blended using conventional means such as a high-speed mixer, and the flexible polyvinyl chloride resin film of the present invention can be obtained by conventional processing methods such as extrusion molding and calendar molding. can.

This film has a thickness of 50 to 150 mm to prevent the label from being scratched and torn during transportation of the bottle container. c.
as, tensile strength measured based on JIS K-6732 is 370 kg/aJ, tear strength is 140 kg/c
It is preferable that the number is m or more.

(Example) Hereinafter, specific aspects of the present invention will be explained using examples.
The invention is not limited to the conditions described herein.

Examples 1 to 3, Comparative Examples 1 to 5 Polyvinyl chloride resin: TK-1000, -1300, -1700, -2500
(Both manufactured by Shin-Etsu Chemical ■) Polyethylene stretch film: Thickness 70IIm (commercial product/indicated as PE in the table) Plasticizer: Diisononyl adipate (manufactured by Shin Nippon Chemical ■) Tin stabilizer: TVS 1360 (Nitto Kasei) Nibutyl stearate lubricant (manufactured by Kawasaki Fine Chemicals) Amorphous silica: Thyroid 74 (manufactured by Fuji Davison, average particle size 31 m)
) were heated and mixed using a high-speed mixer according to the formulation shown in the table, and when the temperature reached 120°C, the mixture was cooled to obtain each compound.

Each pound was made with a width of 600 mm and a thickness of 70 mm using a 90 mm diameter extruder at a die temperature of 210°C. An extruded sheet was molded.

The rubber elasticity, tensile strength, tear strength and impact strength of the obtained sheet were measured by the following methods, and the anti-blocking property was observed and evaluated.

1) Rubber elasticity: From the extruded sheet, the width is 10 cm, the length is 150 cm (marked line interval 1
A test sample of 00■) was cut out, and after elongating the gauge line interval by 20% in the length direction, the time (seconds) until the elongation returned to within 2% was measured (measurement temperature = 20°C).

2) Tensile strength, tear strength: The extruded sheet was measured based on JIS K-6732.

3) Impact Strength A label made from the above extruded sheet was attached to a plastic bottle. The bottle was placed at an angle of 45° from the horizontal plane, and a 400 g iron ball was allowed to fall naturally from above toward the label surface from a height of 500 cm. This was repeated 10 times, and the number of bottles with scratches or tears on the labels was counted.

4) Anti-blocking property: 6 sheets of extruded sheets cut to the size of A-4 size were stacked and pressed at room temperature at a gauge pressure of 20 kgG/csi for 5 minutes, and the blocking properties of the sheets were evaluated using the following criteria. did.

0 Not niblocking.

× Ni blocking.

(Effects of the Invention) The soft polyvinyl chloride resin of the present invention has 1) excellent optical properties such as transparency and gloss, and good printability; 2) moderate flexibility and rubber elasticity, and a bottle surface. 3) Excellent mechanical strength such as tensile strength, tear strength, and impact resistance in both vertical and horizontal directions. 4) Appropriate surface smoothness and excellent blocking resistance. It is possible to make a film with excellent properties such as high quality, good suitability for packaging machines, etc.
It is suitable as a display material such as cylindrical labels and cap seals for various bottle containers such as plastic, glass, and metal.

Patent applicant: Shin-Etsu Chemical Co., Ltd.

Claims (1)

[Claims] 1.1) 100 parts by weight of polyvinyl chloride resin with an average degree of polymerization of 1,300 to 3,000, 2) 35 to 60 parts by weight of a plasticizer, and 3) 0.5 parts by weight of an inorganic substance powder. A soft polyvinyl chloride resin containing ~5 parts by weight. 2. A display material for bottles formed from the soft polyvinyl chloride resin according to claim 1.