Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
426573, 426549, 426615, 426629, 426634, 426442, 426478, 426518, 1062061, 241 241, C08L 306
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a process for the manufacture of a product essentially containing polysaccharide, a polysaccharide product, a polysaccharide composition and an article.
2. Description of the Related Art
It is known to isolate the amylose from amylose-containing plants or plan parts, such as from potatoes.
However, amyloses of that kind are not suitable to serve as a substitute for plastics in the plastics processing industry.
In this content, particularly the aspect of renewable raw materials and their full biodegradability are of interest.
A major problem in industrial exploitation of renewable raw materials resided in the fact that the biopolymers contained in thee vegetable raw materials were present in too low a content on the one hand, and that they just could not be processed like the chemical polymers used in the plastics processing industry on the other hand.
Another problem resides in the fact that hitherto known biopolymers, such as proteins or polypeptides, polynucleotides and polysaccharides, which are present in a variety of plant and animal raw materials, have only an extremely low resistance against moisture.
SUMMARY OF THE INVENTION
Therefore it is the object of the present invention to provide a process for producing a biopolymer, the process product of which may be processed into articles of practical use.
By the process of the invention, it is for the first time made possible to produce a polysaccharide product largely free of protein from a vegetable material.
DETAILED DESCRIPTION OF THE INVENTION
A specific polysaccharide product, namely an amylose, is obtained when pea seeds are used as the vegetable material.
A specific polysaccharide product is also obtained when e.g. dent maize is used, with essentially corn starch, in particular Hyline7, being the resulting polysaccharide product.
The polysaccharide product obtained from the process of the invention generally is obtained in the form of a powder which may, however, be processed into a granulate by conventional measures, e.g. by extrusion.
The polysaccharide product obtained by means of the process of the invention furthermore has thermoplastic properties. This applies in particular to an amylose obtained from pea varieties which are relatively rich in amylose.
Typically, so-called wrinkled peas are used herefor which have a particularly high amylose content, however advantageous polysaccharide products are equally obtained when e.g. dent maize is used.
Amylose-polysaccharide products obtained from such pea varieties have the advantage of having thermoplastic properties and may thus be further processed with the processes common in plastics processing technology. There is consequently no necessity whatsoever for costly supplementary modifications of the previously existing industrial plastics processing facilities, so that from an economic point of view such products can be manufactured at low costs.
A particular advantage of such amylose-polysaccharide products moreover resides in the fact that the price per kilogram lies about in the range for conventional thermoplastics. At the same time, there is no dependency on the raw material "mineral oil", but on the contrary, the increasing demand can be met by renewable raw materials, thereby providing farmers with far-reaching new tasks especially within the framework of the EC. Thus, for example, the harvest of peas cultivated on approximately 400 hectares may yield a total amount of approximately 1.2 metric tons of amylose.
The price can, however, moreover be reduced drastically by using a polysaccharide composition, wherein an amylose-polysaccharide product figures merely as a main constituent and at least one more material of vegetable origin is contained in the composition.
A wide variety of vegetable materials is available, whereby the properties of the polysaccharide composition or of a product manufactured therefrom may also be controlled specifically.
By means of such a polysaccharide composition the cos
patent: 4689409 (1987-08-01), Reeve et al.
Aufsatz von N.U. Haase, "Amylosereiche Erbsenstarke--Eigenschaften und Andung" 1989, pp. 112-115.
Gunther Teege, "Starke und Starkederivate", 1984, pp. 79-85.
E. Gabriel-Blanke, et al., "Gewinnung von Erbsenstarke im Technikumsmasstab", 1990, pp. 239-247.
K & S Bio-Pack-Entwicklungsgesellschaft fur Verpackungen mbH
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