DE1154009B - Plastic containers, such as bottles or the like, for packaging solutions of oxygen-sensitive chemical substances, especially photographic treatment baths in concentrated form - Google Patents

Description

It is known for storing solutions of oxygen-sensitive chemical substances, in particular of photographic treatment baths in concentrated form, for example developer concentrates, Use plastic containers, e.g. bottles. In practice, however, it turns out that only in a few exceptional cases the use of plastic bottles for treatment solutions, in particular Developer solutions, was recommended because the oxygen permeability of the commercially available Plastics in general compromised their suitability for storing photographic developers or the content of additives, for example plasticizers, which damaged the developer. Of the plasticizer-free plastics, polyethylene was the most suitable. The high-pressure polyethylene used so far however, lacked a relatively high oxygen permeability. The so-called Although low-pressure polyethylenes have the desired impermeability to oxygen, they are Insufficient flexibility in the required wall thickness to enable perfect welding.

Mixtures of various polyethylene mixtures are also known, but only used to determine certain mechanical properties of the articles made from them to influence or to obtain improved processing possibilities of the resulting mixtures.

It has now been found that when using a mixture of low pressure and high pressure polyethylene the disadvantages of the individual components can be avoided. Bottles or containers from these mixtures have the following properties:

1. Sufficient stability to prevent unwanted splashing out of the Prevent content,

2. sufficient flexibility to allow welding,

3. Sufficient oxygen impermeability to last for years in the airtight welded state To enable storage of the developer concentrates, which are susceptible to oxidation.

The properties described above can e.g. B. when using 30 percent by weight Low-pressure polyethylene can be achieved in a mixture with 70 percent by weight of high-pressure polyethylene. The proportions of the two components are to be dosed in such a way that they are largely impermeable to oxygen Sufficient strength for hand-held plastic containers, such as bottles or the like,

for the assembly of solutions
oxygen-sensitive chemical substances,

especially photographic
Treatment baths in concentrated form

Applicant:
Agfa Aktiengesellschaft, Leverkusen

Heinrich Becker, Dipl.-Ing. Heinz Sassmann

and Dr. Wolfgang Eichler, Leverkusen,

have been named as inventors

and at the same time sufficient flexibility for the welding process is guaranteed remain. The ratio of the weight proportions of low-pressure and high-pressure polyethylene can depending between 1: 1 and 1: 4 depending on the intended use.

Claims (2)

PATENT CLAIMS: 1. Plastic container, such as bottle or the like, for packaging solutions of oxygen-sensitive chemical substances, especially photographic treatment baths in concentrated form, characterized in that the container consists of a mixture of low-pressure and high-pressure polyethylene, the ratio of the proportions as it is dosed that, with extensive oxygen impermeability, sufficient strength for handling and at the same time still sufficient flexibility for the welding process is guaranteed. 2. Plastic container according to claim 1, characterized in that the low-pressure and High pressure polyethylene is present in a weight ratio of 1: 1 to 1: 4. Considered publications:
German Auslegeschrift No. 1 025 620,
027 543; French Patent No. 1109 864;
Austrian patent specification No. 189 399.