Hoechst Aktiengesellschaft

Dyneon Gmbh

Hermann Bladel

Ludwig Mayer

Manfred Schmid

Hans-Jurgen Hendriock

Gerd Grossmann

Michael Dadalas

Kai-Uwe Tonnes

If hydrophobic substrates are coated--if appropriate under pressure--with an aqueous dispersion of a thermoplastic fluoropolymer having a number-average particle size of up to 100 nm and the fluoropolymer is fixed on the substrate thus impregnated by heat treatment, firmly adhering coatings are obtained.

Coating of porous, hydrophobic substrates with thermoplastic

Layered product

Polytetrafluoroethylene micropowders, which can contain up to about 3% by weight of comonomers, are obtained with a narrow molecular weight distribution, a narrow range of specific surface area and a primary particle size of from 150 to 250 nm by polymerization in aqueous medium using hydrogen, methane or ethane as chain transfer agent and at an availability of free radicals remaining essentially constant over the polymerization time. These micropowders are particularly suitable for preparations of polyacetals which give only small deposits in the molds during melt processing and have increased color stability.

Polytetrafluoroethylene micor powders, their preparation and use

Metallic substrates or substrates metallized at at least one surface are electrostatically powder coated with fluorinated polymers processable from the melt in admixture with 0.1 to 4% by weight of potassium titanate fibers.

Powder coating process employing fluorinated thermoplastics in admixture

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Emmerting, Germany

Hermann Bladel