JPS58160271A - Vessel with multilayer wall - 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 object of the invention is to provide a 1! It's about vessels.

It is known to use containers with walls consisting of multiple layers of different polymers for the storage of products, especially food products, which are sensitive to light and/or gases such as oxygen in the air. It is.

That is, French Patent No. 2,132,395 describes a bottle body made of boria oxide and a polyolefin obtained by graft polymerization of a dicarboxylic acid. This bottle is often used for food preservation. This bottle body is obtained by a known coextrusion blow molding method. In this case, the resistance to gases is obtained by boria and polyethylene is permeable to gases.

For the storage of products sensitive to light and gases, it is possible to make containers made of multiple layers of the same polymer, and this cypress container is made of layers of different polymers. Applicant confirms that the container has nine different features than a container consisting of walls.

The invention therefore provides a method for preserving products that are sensitive to light and possibly gases. It is an attempt to provide a vessel.

The purpose of this rounding, Book 11, is to at least a) 80
0 nanometer Ti is the first thermoplastic polymer containing one charge to block light of wavelengths greater than 4It-
and b) a layer of the same thermoplastic polymer containing one type of charge so as to block light of lower wavelengths.

In this way, the two layers of the wall block all light rays and there is no effect of these rays on the contents of the container.

The blocking of light rays is accomplished through reflection and absorption.

The fact that both polymers are identical eliminates the phenomenon of incompatibility that would occur if the polymers were different. Such a phenomenon requires the presence of an adhesive layer.

The polymers constituting each layer of the container according to the invention can be gas permeable or gas impermeable polymers.

In this case, for example, the high density i9 can be a low density polyethylene, the polypropylene can be a polyolefin such as polybutene.

11th is o, s~30 heavy, preferably 0.5~l
It can contain a charge of O heavy Il-.

This charge can be a white or highly reflective charge such as titanium dioxide, carbonized calcium, zinc oxide, etc.

Due to its reflective power, this charge prevents the product in the container from increasing by m degrees when subjected to the action of the i-length beam of 800 nanometers or more.

No. 211 is 0.01 to 20 weight, preferably 0.1
It can contain up to 511 kg of charge.

The carbon charge can be primarily carbon black.

The container according to the invention can be used for the storage rounding of all products that deteriorate under the action of light.

Of course, in the case of food, the tilt-forming polymer that comes into contact with the food has a so-called 1-negative property (a11m@ntairs).
s)”.

9. In front of the product, an additional inner third layer of the same polymer is provided, which prevents contact between the food product and the 9th charge contained in the 9th layer, and this third layer does not contain any charge; Also, if it is necessary for this No. 311T to contain 1 food grade charge, it is also necessary to do so.

When the container according to the present invention is used for storing milk, for example, it can be constructed of the following high-density polyethylene layer.

a) Outer fill containing titanium dioxide @ Part 2] IIb) Inner part containing carbon black or not containing titanium dioxide
The thickness of the middle 1 is 100
The thickness of the strike 14I layer is comprised between 50 and 400 microns.

As mentioned above, these containers are obtained by a coextrusion blow molding process, in which case each layer is molded in a separate extruder when the polymers constituting each layer contain different charges. can get.

If the polymers constituting the two layers contain similar charges (
In the case of the above-mentioned bottles), the container has two extruders per triplicate.
-f is obtained.

In fact, the presence of titanium dioxide in the 911m is not harmful to milk.

The following examples are illustrative of the invention and are in no way limiting.

This example concerns the illustration of a container according to the invention and its application for milk preservation and storage.

Density tLd = 0.960, molecular weight (number) vy, -1
A three-layer bottle made of high-density polyethylene with a molecular weight (weight) of 12,000 and a molecular weight (Mw) of 12,000 was manufactured by extrusion.

The outer side 141 has a thickness of approximately 300 microns and a weight of 3-
of titanium dioxide.

The intermediate layer has an IJ depth of about 300 microns and contains 2 weight carbon black.

The inner layer 11r- is the same as the outer layer 91.

Nine milks were boiled into these bottles at 130C for 4 seconds. Capsules consisting of a composite of aluminum (micrometers thick) and polyethylene (50 micrometers thick) containing acrylic acid in a graft state of up to 5% by weight. was held at 120C for 20 minutes.

These bottles were exposed to natural light at about 2oC for 3 months.

At the end of this period, the milk remained unchanged and of excellent quality. Polyethylene 11- without charge
This is different for bottles made of milk, which have a shelf life of about two days.

It should be noted that the nine bottles tested were air permeable bottles and the milk contained oxygen, so the WR reaction did not occur and the nine bottles were contained in each polymer. This is thought to be because the catalytic action of the oxidation reaction by the light did not occur due to the nature of the material.

Claims (1)

[Scope of Claims] 1. A thermal orll whose walls contain at least a) a beam of light having a wavelength of 800 nanometers or more;
and b) a thermally 0 TII polymer polymer No. 211 containing a charge of 1 oak so as to transmit light having a wavelength of 800 nanometers or less. Container containing % fine. The container according to claim 1, characterized in that the λ polymer is selected from the group consisting of high-grade polyethylene, polyethylene and polybutene. 3. #I1 layer of A container according to either claim 1 or claim 2, wherein the charge is selected from the group consisting of titanium dioxide, calcium carbonate, and salivary lead oxide. One layer has a weight ratio of 0.5 to (capital) weight, preferably 0.
A container according to any one of claims 1 to 3, characterized in that it contains a charge of 5 to 10 liters in weight. A container according to any one of claims 1 to 4, characterized in that the charge of IL 211 is carbon black. 6. No. 2111 is 0.01 to 4 weight-1 preferably 0
．． 1! according to any one of claims 1 to 5, characterized in that it contains a charge in an amount of 1 to 1s11 -. vessel. 5. A container according to any one of claims 1 to 4, characterized in that the container comprises an additional inner layer of the same polymer. A storage container for food and milk whose walls are made of high-density polyethylene and contains 31-% mold. IL) Containing 0.5 to (capital) weight of titanium dioxide and having a thickness of 50 to 400 microns
b) an intermediate second layer containing 0.01 to 30 weight carbon black and having a thickness in the range 100 to 300 microns; c) 0.5 to 30 weight titanium dioxide. an inner third layer having a thickness of 400 microns. 9. A container according to any one of claims 1 to 8, which is manufactured by a coextrusion blow molding method.