PRIMER COATING COMPOSITION FOR TOPCOATS OF FLUOROCARBON POLYMERS CONTAINING A POLYARYLENE SULFIDE RESIN, AN AROMATIC POLYETHER-SULFONE RESIN OR AN AROMATIC POLYETHER-KETONE RESIN

摘要

Abstract of the disclosure:A primer coating composition which is particularlysuitable for topcoating with fluorocarbon polymers isdescribed, this primer composition containsa) 100 parts by weight of a copolymer of tetrafluoro-ethylene, perfluoro(alkylvinyl) ethers and if appropriatehexafluoropropylene or vinylidene fluoride,b) 10 to 250 parts by weight of a mixture of lithiumhydroxide and finely divided silicon dioxide produced bythermal treatment,c) 10 to 1000 parts by weight of at least one thermo-plastic resin from the group comprising the polyarylenesulfide resins, the aromatic polyether-sulfone resins andthe aromatic polyether-ketone resins andd) water as a liquid carrier.Up to 80 parts by weight of component a) can, ifappropriate, be replaced by dispersed polytetraflusroethy-lene particles. The primer composition is especially suitable forapplication on articles with uneven surfaces, since it issufficiently adhesion-promoting even in relatively thicklayers. It is used for coating both metallic and non-metallic substrates, and a topcoat of a fluorocarbonpolymer is subsequently applied, without intermediate heattreatment being necessary.