Method of producing a polytetrafluorethylene material

Details Method of producing a polytetrafluorethylene material Method of producing a polytetrafluorethylene material

1985-12-10

1986-12-30

Lilling, Herbert J.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523205, 523209, 523307, C08K 904, C08L 2712

Patent

active

046329471

ABSTRACT:
The present invention relates to a method of producing a polytetrafluorethylene material comprising filler particles embedded therein. In fact, the mechanical characteristics of most synthetic materials can be improved by the inclusion of filler particles. Nevertheless, tests performed to embed filler particles in PTFE have unexpectedly resulted in the reduction of essential mechanical characteristics (tensile strength, rupture elongation) due to this inclusion. According to the invention, this disadvantage is prevented by a method according to which the filler particles are coated with an in melted condition relatively low viscous and/or polar perfluoralkoxy copolymer (PFA), tetrafluorethylene-perfluorpropylene copolymer (FEP) or mixtures thereof serving as adhesive agent before mixing them with polytetrafluorethylene. This permits to obtain substantial improvement of the mechanical properties.

REFERENCES:
patent: 4026863 (1977-05-01), Iseki et al.
patent: 4128693 (1978-12-01), Dhami et al.

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