JPH0476858B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bottle for drinks containing citrus fruit juice such as tangerine, orange, and grapefruit, which is made of polyethylene terephthalate resin and made of biaxial stretch blow molding. The purpose of this invention is to obtain a bottle that can be stored and held without deteriorating its appearance.

Biaxial stretch blow-molded bottles made of polyethylene terephthalate resin (hereinafter referred to as PET for simplicity) are widely used in large quantities as liquid storage bottles due to their various excellent properties and physical properties. .

As mentioned above, this PET bottle has a variety of excellent properties and physical properties, but when a citrus fruit juice-containing beverage is stored, the mouth becomes slightly white due to crystallization to improve heat resistance. It is known to cause discoloration or browning of the colorless and transparent body.

If the white mouth part fades or browning occurs on the body, the above-mentioned phenomenon will be accentuated due to the excellent transparency of the PET bottle, which will affect the appearance of the product. There was a drawback that significantly degraded the image.

Furthermore, as mentioned above, since PET bottles have extremely high light transmittance, they allow a large amount of ultraviolet rays to pass through them, which can cause discoloration and deterioration of the fruit juice-containing beverages contained therein. Something happened.

The present invention was devised to solve the drawbacks and problems of the conventional examples described above, and is molded from a polyethylene terephthalate resin material to which a yellow pigment and an ultraviolet absorber are added together, which does not cause any food hygiene problems. It is.

Hereinafter, the present invention will be explained with reference to diagrams showing the characteristics of the present invention.

The bottle for beverages containing fruit juice according to the present invention contains 0.005 to 0.5 [%] by weight of a yellow pigment that does not cause any food hygiene problems.
Polyethylene terephthalate resin (hereinafter simply referred to as PET) is a polyethylene terephthalate resin (hereinafter simply referred to as PET
This is a bottle for a citrus juice-containing beverage that is biaxially stretch-blow molded by the following method.

Examples of yellow pigments that pose no food hygiene problems include monoazo, disazo, and condensed azo pigments, as well as manthurachino, isoindolinone, and berynone pigments.

Furthermore, as the ultraviolet absorber to be added together with the yellow pigment, benzotriazole-based or hydroxyphenyl-based ones are suitable.

In this way, the bottle according to the present invention has a yellow pigment.
Since it is added in a weight ratio of 0.005 to 0.5% to PET, it has a pale yellow colored and transparent appearance.
Since the color is almost the same as that of the stored citrus juice-containing beverage, the discoloration of the white mouth and browning of the body will not appear in the appearance of the bottle.

In addition, when measuring the light transmittance of the bottle according to the present invention, it is found that at a wavelength of 400 nm in the visible light range, it is 10 to 10.
30%, 50-80% at wavelength 450nm, at wavelength 500nm
It exhibits a light transmittance of 65 to 90% and more than 80% at wavelengths of 650 to 700 nm, and when the horizontal axis represents the wavelength of light and the vertical axis represents the transmittance, as shown in the figure, its light transmission characteristics are shown by the diagonal lines. It becomes like that.

As is clear from the light transmission characteristic diagram shown in this figure, the bottle of the present invention contains both an ultraviolet absorber and a yellow pigment, so it can withstand not only ultraviolet rays up to a wavelength of 370 nm but also ultraviolet rays up to a wavelength of 400 nm. Although it exhibits a relatively large light-shielding property against short-wavelength light, it has sufficient transparency for light with a wavelength of 500 nm or more, so it is perceived by the human eye as colored and transparent with almost high transparency. , and there is no deterioration of the transparent product image.

However, when the yellow pigment is added to a weight ratio of about 0.5%, the transparency of the bottle decreases considerably, as shown by the lower limit line in the diagram, and the transmittance tends to decrease rapidly, especially around a wavelength of 450 nm. Therefore, in order to ensure that the browning phenomenon of the bottle body is not visible to the human eye and to obtain higher transparency, it is desirable that the upper limit of the amount of yellow pigment added is approximately 0.01% by weight. .

As a specific example, 0.0062% by weight of monoazo yellow and red iron oxide are added as yellow pigments,
As a UV absorber (2-c3'-tert-Bulyl-
2′-hydroxy-5′-methylphenyl)-5′-
A product containing 0.1% by weight of chlorobenzo triazole and 0.1% by weight of fatty acid amide or higher fatty acid metal salt as a dispersant exhibits light transmission characteristics as shown by the dashed line in the diagram, and has high visible light. It was possible to obtain a bottle that maintains light transmittance while preventing discoloration of the mouth of the bottle and browning of the body of the bottle from being visible.

As is clear from the above description, since the bottle according to the present invention contains both a yellow pigment and an ultraviolet absorber, it can almost completely block ultraviolet rays, thereby preventing the juice-containing beverage contained therein from being absorbed. discoloration,
It is possible to prevent the occurrence of deterioration, and since it is originally colored pale yellow, there is no appearance of discoloration of the mouth or browning of the body, which maintains a constant appearance. This has excellent effects such as not deteriorating the product image.

[Brief explanation of the drawing]

The drawing is a diagram showing the light transmittance properties of the bottle according to the invention.

Claims (1)

[Claims] 1 Yellow pigment that does not cause any food hygiene problems by weight
A bottle for beverages containing citrus fruit juice biaxially stretched and blow-molded from a polyethylene terephthalate resin material containing 0.005 to 0.5% and an ultraviolet absorber added in a weight ratio of 0.05 to 0.2% to block ultraviolet rays up to 370 nm.