Fiber-containing plastics, process for producing the same, fiber

Details Fiber-containing plastics, process for producing the same, fiber Fiber-containing plastics, process for producing the same, fiber

1996-03-22

1998-03-03

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 35, 523351, C08L 108, C08L 100, C08L 124

Patent

active

057235228

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a fiber-containing plastic material, a process for its production, a fiber-containing granulate, and a fiber containing polymer compound.


BACKGROUND OF THE INVENTION

It has been frequently tried to modify such plastic materials, particularly thermoplastic materials with fibers, in order to achieve a pleasing aspect. The obtained results have always been unsatisfactory, since on the one hand the mechanical impairment of the plastic material could not be avoided. This is due primarily to the fact that the fibers can not be satisfactorily embedded in the plastic matrix, particularly at the fiber ends. The thereby occurring notch effects lead to stress concentrations in the plastic material in the area of the fiber ends, so that as a whole the mechanical strength of the plastic material was reduced.
On the other hand this resulted in a brittleness of the material, so that such modified plastics could not be used.
The above-mentioned drawbacks occur especially when glass fibers, aramid fibers or carbon fibers are used.
The latter have also the additional disadvantage of being sensitive to bending. This partially causes the carbon fibers to break during the extrusion process and to protrude as short stubs from the surface of the plastic material. Such plastic materials can not be used for technical purposes. An overview of these undesired characteristics is offered by Ullman, Encyclopedia of Industrial Chemistry 1992, Vol. A 20, Page 732 and following.
Furthermore it has been tried to incorporate synthetic fibers as fiber fillers into thermoplastic material. However this resulted in premature melting of the synthetic fibers. Thereby on the one hand the fiber structure was damaged. On the other hand another aspect of the fibers suffered, because the crimping effect could not be overlooked. In addition, in the case of synthetic fibers a color mixing of the polymer with the synthetic material can not be completely prevented, so that the required final coloring was always influenced by the color of the plastic material as well as the color of the synthetic fibers.


OBJECT OF THE INVENTION

It is therefore the object of the invention to create a fiber-containing plastic material, which in spite of the embedded fibers, offers good mechanical strength and wherein no interaction occurs between the dyes of the fibers and the dyes of the plastic material.


SUMMARY OF THE INVENTION

The invention solves this problem through a plastic material.
From the invention results the advantage that, due to the clearly good dispersion characteristics of the fibers, a good and even distribution of the fibers in the matrix of the plastic material takes place.
This advantage can be even enhanced in that the fibers as a fiber filler in the form of preliminary extruded granulate can be extruded together with the plastic one more time, without the fibers losing their positive characteristics they have in combination with the plastic material. Due to the double extrusion of the fibers--the preliminary extrusion for producing the granulate and the additional common extrusion with the plastic material--a very good and even distribution of the fibers throughout the plastic material can be achieved. This advantage could not be offered for instance with the use of carbon fibers. With carbon fibers there is always the danger that during extrusion they are filled and mechanically stressed to the extent that they split up and fray.
This advantage is achieved due to the combination of natural or semisynthetic fibers with the corresponding plastic material. Thereby the invention takes advantage of the finding that the fibers are relatively elastic and soft, but at the same time offer a certain mechanical consistency, so that basically they can be completely embedded within the respective plastic matrix. In none of the cases could apparent fibers ends be found on the surface of the plastic material.
It is therefore an aspect of the invention that for these reasons the sought after plastic material

REFERENCES:
patent: 4769405 (1988-09-01), Kondo et al.

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