Primer coating composition for topcoats of fluorocarbon...

C - Chemistry – Metallurgy – 08 – L

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C08L 27/18 (2006.01) C08K 3/22 (2006.01) C08L 71/00 (2006.01) C08L 81/02 (2006.01) C09D 171/00 (2006.01) C09D 181/02 (2006.01) C09D 181/06 (2006.01)

Patent

CA 1212189

Abstract of the disclosure: A primer coating composition which is particularly suitable for topcoating with fluorocarbon polymers is described, this primer composition contains a) 100 parts by weight of a copolymer of tetrafluoro- ethylene, perfluoro(alkylvinyl) ethers and if appropriate hexafluoropropylene or vinylidene fluoride, b) 10 to 250 parts by weight of a mixture of lithium hydroxide and finely divided silicon dioxide produced by thermal treatment, c) 10 to 1000 parts by weight of at least one thermo- plastic resin from the group comprising the polyarylene sulfide resins, the aromatic polyether-sulfone resins and the aromatic polyether-ketone resins and d) water as a liquid carrier. Up to 80 parts by weight of component a) can, if appropriate, be replaced by dispersed polytetraflusroethy- lene particles. The primer composition is especially suitable for application on articles with uneven surfaces, since it is sufficiently adhesion-promoting even in relatively thick layers. It is used for coating both metallic and non- metallic substrates, and a topcoat of a fluorocarbon polymer is subsequently applied, without intermediate heat treatment being necessary.

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