Biodegradable composition comprising regenerative raw material a

Details Biodegradable composition comprising regenerative raw material a Biodegradable composition comprising regenerative raw material a

1997-02-14

1998-02-17

Szekely, Peter A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524 9, 524 13, 524 35, 524 47, 264142, 26432817, 26432818, 26433113, C08L 302, C08L 102, C08L 700, B29C 4546

Patent

active

057192030

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a biodegradable material and a method of producing it. Biodegradable materials are those that decompose under the influence of environmental conditions and the action of destructive agents. Biodegradable materials are already known in which peas are used as the base material. It is also known to incorporate starch into conventional polymers to achieve partial degradability. In these starch-filled plastics, however, only the inserted starch component degrades, making the plastic matrix break down into numerous small pieces.
It is an object of the invention to propose a material that is completely biodegradable and is suited for incorporation therein round or fibrous particles to form composites.


SUMMARY OF THE INVENTION

This object is accomplished by providing a biodegradable material characterized by the following composition (wt. %):


______________________________________ caoutchouc 5 to 50% starch powder 4 to 25% polybetahydroxybutyrate 10 to 50% auxiliary agents 0 to 15%. ______________________________________
The biodegradable material may alternatively be characterized by the following composition (wt. %):


______________________________________ caoutchouc 5 to 50% starch powder 4 to 25% cellulose powder 10 to 50% auxiliary agents 0 to 15%. ______________________________________
The biodegradable material may have a thermoplastic matrix and be inserted, granulated or fibrous fillers comprising regenerative raw materials, characterized in that the matrix comprises


______________________________________ caoutchouc 5 to 50 wt. % starch powder 4 to 25 wt. % polybetahydroxybutyrate 10 to 50 wt. %. ______________________________________
The biodegradable composite may have a thermoplastic matrix and be inserted, granulated or fibrous fillers comprising regenerative raw materials, characterized in that the matrix comprises


______________________________________ caoutchouc 5 to 50 wt. % starch powder 4 to 25 wt. % cellulose powder 10 to 50 wt. %. ______________________________________
The biodegradable composite may have a thermoplastic matrix and be inserted, granulated or fibrous fillers comprising regenerative raw materials, characterized in that the matrix comprises


______________________________________ caoutchouc 5 to 50 wt. % starch powder 4 to 25 wt. % polybetahydroxybutyrate/cellulose 10 to 50 wt. %.--; ______________________________________ 25 wt. % of starch. A third component is added to these base components of caoutchouc and starch in a proportion of 10 to 50%. This component is either polybetahydroxybutyrate or cellulose powder. The former is obtained through polymerization of beta-hydroxybutyric acid. It is also commercially available under the trade name "Biopol" (by Zeneca).
Caoutchouc is an essential component of the materials of the invention. Natural caoutchouc is preferred because it is completely biodegradable. However, it is also possible to use artificial caoutchoucs that are at least partially biodegradable, or that degrade after lengthy storage under conditions that encourage degradation, depending on the type of additives used. The starch powder and the third component, which is also essentially in powder form, are dispersed homogeneously in the base caoutchouc mass, and are no longer visible, at least to the naked eye. The material of the invention has more or less elasticity depending on the caoutchouc component. It is therefore better suited for the production of molded bodies in which elastic properties take priority over solidity and stability.
A crucial feature of composites is that sufficient adhesion exist between the inserted particles, for example round or fibrous particles, and the matrix material. The mechanical properties are basically determined by the quality of the boundary surfaces between the particles and the matrix. It has been seen that the basic composition according to invention can take in relatively large quan

REFERENCES:
M. Vert: "Biodegradables, realites et perspectives"; In: Caoutchoucs et plastics, vol. 68, No. 706, 1991, pp. 71-76.
R.A. Buchanan et al.: "Powdered elastomers from starchencased latex particles". In: Rubber Journal, Oct. 1971 USA, pp.28-35.

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