JPS607817A - Drink cup - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a beverage cup, and more specifically, it has a high degree of whiteness, gloss, and a high-quality paper-like appearance with suppressed transparent El+] feeling, and is suitable as a beverage cup 7". Relating to a beverage cup having a height/average diameter.

Traditionally, beverage cups, especially vending machine cups.

Disposable cups such as recreational cups and party cups are often made of paper, synthetic resin, or a laminate film of paper and synthetic resin. However, although paper cups are lightweight and have excellent incineration properties, they are inferior in water resistance, require an adhesive process to manufacture, resulting in low productivity, and have drawbacks such as safety restrictions when selecting adhesives. There is.

For this reason, laminates in which paper is coated or laminated with synthetic resin are used, but although this improves water resistance to some extent, it cannot be said that it is essentially improved due to the cut parts, and furthermore, laminates are used as raw materials. However, since the production process is essentially the same, productivity is low and it is expensive. Furthermore, due to the characteristics of the paper, containers using these papers can only be made in relatively simple shapes such as circles or squares, and they also have the drawback of not being able to be molded in one piece and having to avoid adhesion. be.

For this reason, cups made by thermoforming various synthetic resin sheets have recently begun to be used, but these are easy to process, lightweight,
Although it has excellent hygiene properties, it does not have sufficient heat resistance or rigidity. In addition, its appearance has a gloss characteristic of synthetic resins, and its hiding power and printability are poor, making it impossible to obtain a high-class feel like a paper cup. Moreover, when these cups are disposed of, they cannot be crushed due to the elasticity of the resin, making them extremely bulky, and when incinerated, the burnt calories are much higher than paper, and the walls of the incinerator burn. Disposal by incineration may cause damage, melt and solidify, and depending on the type of resin, may produce toxic gas or black smoke.
There are two major social problems.

Therefore, in order to solve these problems, it is possible to mix inorganic fillers such as calcium carbonate into thermoplastic resins, but the resulting resins have poor heat resistance and rigidity, and have insufficient texture in appearance. In addition, due to the elution of fillers, thermoplastic resin cups cannot be used for food hygiene reasons.For these reasons, thermoplastic resin cups are inferior to paper cups in various respects, and they do not have superior properties. Although it has high productivity and productivity, it has not yet been put into practical use.

The applicant has already proposed a container that improves these drawbacks, but after further study, it was discovered that by using a specific material and thermoforming it, a container with an even better appearance could be obtained. Moreover, they discovered that this container was particularly suitable for use as a drinking cup, and were able to complete the present invention.

That is, the present invention is a beverage cup made by thermoforming a polyolefin resin sheet made of polyolefin resin, talc, and titanium oxide, and whose height/average diameter is 1.1 to 2.0. It provides a cup.

The polyolefin resin in the present invention is not particularly limited and may include various resins, such as polypropylene resin and polyethylene resin.

Further examples include polybutene resin.

Examples of the polypropylene resin include propylene homopolymers, block copolymers and random copolymers of propylene and 30% by weight or less of other α-olefins such as ethylene, and mixtures thereof. In addition, the melt index of this polypropylene-based fat is generally 0.1 to 5! ;I/10 minutes, preferably 0.2-3g710 minutes, more preferably 6'! , 0.3
~1.5g/10 minutes.

In this case, if the melt index exceeds 59/10 minutes, the melt strength of the sheet will be low, and conversely
．． If the time is less than 19,710 minutes, the fluidity is poor and the uniform kneading ability with talc and titanium oxide is insufficient, making secondary moldability such as thermoforming difficult.

On the other hand, there are various types of polyethylene resins, such as high-density polyethylene, medium-density polyethylene, and low-density polyethylene, and in addition to ethylene homopolymers, other α-olefins containing less than 8% by weight of ethylene Random or block copolymers (such as propylene) are available. Here, the high-density polyethylene is one with a density of 0.940 to 0.970 and A1, and the medium- and low-density polyethylenes are high-pressure polyethylene, ethylene and propylene obtained by a medium- and low-pressure method, and phyten-1,4.
- 3 to 1 carbon atoms, such as merpentene-1 and octene-1
There are copolymers of 2 and α-olefins, so-called linear low-density polyethylene (LLDPE) cars. Further, the melt index of this polyethylene resin is usually 0.02 to 10.0 min, preferably 0.03 to 10.0 min.
s, og/10 min, more preferably 0.04-2.09
/10 minutes. If the tart index of this J-silyethylene resin is outside the above range, it is unfavorable in terms of melt-kneading sheet formability and secondary formability with thermoformed bouquets.

The polyolefin resin in the present invention may be the above-mentioned polypropylene resin, polyethylene resin, polybutene resin, etc., used alone or appropriately mixed, but a lighter deep cup can be formed by vacuum forming or pressure forming. In order to carry out continuous mass production by secondary molding, it is effective to use a mixture of the above-mentioned polypropylene resin and polyethylene resin. The mixing ratio of polypropylene resin and polyethylene resin in this mixture is not particularly limited, but generally the former:latter = 9:1 to 1:9.
(weight ratio), preferably 7:3 to 3 (weight ratio).

The blending ratio of the polyolefin resin in the present invention is not particularly limited, but it should normally be 30 to 80% by weight, preferably 40 to 75% by weight, based on the total composition.

Next, the talc in the present invention is not particularly limited in its type, shape, etc., but usually has an average particle size of 5 to 30.
μ, preferably 10-20μ of hydrous magnesium silicate, its composition is 5in250-65%, Mg025
~40% and other ingredients, and has a loss on ignition of 1% or less.

The blending ratio of Merck varies depending on the shape of the intended molded product and cannot be unambiguously determined, but it is usually 20 to 70% by weight, preferably 25% by weight of the entire composition.
It is set in the range of ~60% by weight.

If Merck's blend 1Y is too large, the rigidity and incineration properties will improve, but the melt kneading, sheet formability, and secondary formability such as thermoforming will deteriorate.

Further, as the talc, as mentioned above, various kinds of talc can be used, and for example, highly purified talc or talc treated with acid to remove impurities can also be used. Note that this Merck does not require any additional means such as surface treatment.

Next, the titanium oxide used in the present invention is usually referred to as titanium dioxide (Tie), but it may also be mixed with a small amount of titanium monoxide (TiO) or titanium trioxide (90 g of Ti). There are no particular restrictions on the shape of this titanium oxide, but it is generally granular with an average particle size of about 0.05 to 2 μm, preferably about 0.1 to 1 μm;
It is in powder form, etc. Furthermore, although the blending ratio of titanium oxide varies depending on various surface properties and is difficult to determine unambiguously, when a sheet with a thickness of 1 mm is formed from the composition, the total light transmittance of this sheet is 3% or less. In particular, it is preferable to aim for a ratio of 2% or less.

It is selected in a range of 1 to 10% by weight, preferably 1.5 to 8% by weight of the entire composition. Conventionally, when titanium oxide was blended, it was generally in a small amount, usually not more than o, s% by weight of the entire composition. However, in the present invention, a relatively large amount of pregelatinized titanium is blended together with talc, which is completely different from conventional products.

As described above, in the present invention, the polyolefin resin sheet is made of three components: polyolefin resin, talc, and titanium oxide, but if necessary, rubbers such as ethylene-propylene rubber and ethylene-propylene-diene rubber, anhydrous It is also possible to add polyolefin resins modified with unsaturated carboxylic acids such as maleic acid or derivatives thereof. In addition, various antioxidants, ultraviolet absorbers, antistatic agents, lubricants, additives, etc. can be added.

The beverage cup of the present invention is made from the three ingredients detailed above, which are formed into a sheet and then molded into a specific shape.

That is, the above-mentioned three components and desired components are sufficiently kneaded using a conventional kneading method, such as a roll, pantry mixer, -screw extruder, or multi-screw extruder, followed by a calendering method or a T-screw extruder.
Die method 1. Form into a sheet using C method.

Next, the thus obtained polyolefin resin sheet is formed into a beverage cup by secondary thermoforming such as vacuum forming or pressure forming. By adopting this molding method, it is possible to make many pieces at once, the molding cycle is short, and it is possible to continuously produce cows for many months. Note that the thickness of the sheet is usually 0.2 to 3 πm.

Furthermore, the beverage cup of the present invention has a height/average diameter of 1
．． 1 to 2.0, more preferably 1.2 to 1.7. The present invention is as described above (polyolefin resin,
Since it is made by thermoforming a polyolefin resin sheet made of talc and titanium oxide, a deep container can be obtained without reducing melt crosstalk and having sufficient melt strength. Therefore, a vertically long container having a height/average diameter within the above range and suitable as a beverage cup can be obtained. In addition, by inwardly curling the edge of the opening of the beverage cup obtained by thermoforming, the cup can be easily curled, making it more desirable as a beverage container. The shape of the beverage cup is not particularly limited as long as it has a height/average diameter within the above range, but it may expand from the bottom of the cup toward the opening. An undercut may be provided at the bottom periphery.

In addition, the whiteness of the outer surface of the cup is 90% or more, preferably 9
2% or more, gloss G according to ASTM D 523
8 (60°) is 10% or less, preferably 8% or less.

The beverage cup of the present invention thus obtained has the following excellent properties.

In other words, it has high whiteness, no gloss, and 11i
Its high strength eliminates the plastic feel and gives it a luxurious appearance. ■Not only the appearance, but also the texture and feel when tapped are like high-quality paper. ■High strength,
Demonstrates rigidity, heat resistance, and water resistance. ■It is odorless and has no filler elution, making it highly safe. ■Good printability and paintability.

■It has moderate foaming properties and is suitable as a single container of beer or carbonated beer. It is easily deformed or destroyed by crushing it with force at 0 degrees Celsius or more, and it does not return to its original form when crushed, so waste should not be disposed of without using force or force. Easy to use. ■The heat generating part is low, so there is no damage to the furnace wall during incineration.
In addition, it does not cause melting and assimilation and does not generate toxic gas or black smoke, making it easy to incinerate waste.1. (・ru. ■i Mogata cycle is short, continuous mass production '+ n3 ability ■When stacked, they do not stick together, stacking characteristics in vending machines,
Good falling characteristics.

Therefore, the six pots u':t'IN for beverages of the present invention can be used as beverage cups for commercial and home use, such as cups for personal IJ vending machines, cups for vacations, and )ζ-Vooey 711 cups. It is expected that it will be used for

Next, the present invention will be explained by examples. However, the present invention is not limited to these. T...

Example polypropylene homopolymer (density 0.91 AnL3
'Melt index (MI) 0.69/10 minutes)
25% by weight, high density polyethylene (density 0,964 3° MI O, 49710 min) 25% by weight, average particle size 1
46% by weight of 5μ talc and 4% by weight of titanium oxide were melt-kneaded and pelletized using a Banbury mixer, and then a 1-inch thick sheet was obtained using an extrusion molding machine. Next, a cup-shaped thermoformed product (height 90+nm/average diameter 60mm=1.
5) was manufactured. The opening periphery of the resulting cup was heated and curled to obtain a beverage cup as shown in FIG.

The resulting drinking cup has a bottom thickness of 0.85 mrt.
t.

The light transmittance of the bottom according to ASTM D 1003 is 0.
6%, the thickness of the peripheral edge was 0.36 m+a, and the light transmittance of the peripheral edge was 6.3%. The appearance of this beverage cup had the texture of high-quality paper and was full of luxury. The buckling strength of this drinking cup is 19.5
kg, the side compressive strength is 145g, the whiteness of the outer surface of the cup is 94.3%, and the glossiness GS (60°) is 6.0.
%Met.

Note that no abnormality was observed when water at 25°C was placed in this drinking cup. The calorie burn rate of this beverage cup was 5,430 cal/g, which was very low compared to the 9,860 cal/g of the RUPSV-P Tsunobu, and close to the 4,500 cal/g of the Ito C cup.

Comparative Example 1 A commercially available high-grade paper beverage cup has a buckling strength of 44 kg, a side compressive strength of 130, a force of 2, and an outer surface whiteness of 9.
2%, and the glossiness GF3 (60°) was 19.5%. In addition, add water at 25°C to this cup and add 1
The buckling strength after 0 minutes was 19 kg, the side compression Uft was 709, and the water resistance was sufficient (1 noL force). Further, after immersion in hot water at 85° C. for 5 minutes, the curled portion and body-attached portion swelled to form a key shape.

Comparative Example 2 A HIPS beverage cup was immersed in boiling water at 90°C for 5 minutes, resulting in a deformed opening and a diameter of 81 mm.
It contracted to mt.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a beverage cup according to the present invention. Patent applicant: Idemitsu Petrochemical Co., Ltd. Representative: Patent attorney Kubo 1) Fujibe Figure 1

Claims (1)

[Scope of Claims] 1. A beverage cup made by thermoforming a polyolefin resin sheet made of polyolefin resin, talc, and titanium oxide, the height/average diameter of which is 1.1 to 2.
0 drinking cup. 2. The beverage cup according to claim 1, which has a height/average diameter of 1.2 to 1.7. 3. The beverage cup according to claim 1, wherein the peripheral edge of the cup opening is curled.