Process for coating metal substrates with primer and coating powders
AssigneeElf Atochem S.A.
InventorsJean-Yves Dutheil, Eric Perraud
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Abstract
A process for preparing a metal plastic composite comprising prime coating at least a portion of a metal substrate with one or more layers of an adhesion primer powder consisting of a solid thermosetting resin using a conventional powder application technique, heating the thus coated substrate to a temperature sufficient to melt a surface coating powder to be subsequently applied, immersing the thus coated substrate into a fluidized bed of a surface coating powder for a time sufficient to give the thickness of surface coating desired.
Claims8
A process for coating a metal substrate, comprising;
- prime coating an unheated metal substrate with a dry primer powder, wherein the primer powder is a mixture of a powdered resin and a powdered hardener, heating the substrate coated with the primer powder to a temperature sufficient to melt a surface coating powder, and thereafter contacting the prime coated heated substrate with the surface coating powder.
A process for coating a metal substrate, comprising;
- prime coating an unheated metal substrate with a dry primer powder, wherein the primer powder comprises a powdered resin and a powdered hardener, single heating the substrate coated with the primer powder to a temperature sufficient to crosslink said primer powder and store an effective amount of energy in said substrate to melt a surface coating powder, and thereafter contacting the prime coated substrate with the surface coating powder, wherein said hardener is an acid anhydride or isocyanate based compound.
A process for coating a metal substrate with plastic comprising sequentially prime coating an unheated metal substrate with a dry primer powder, heating the substrate coated with the primer powder to a temperature sufficient to crosslink the primer powder and to melt a surface coating powder, and thereafter contacting the prime coated heated substrate with the surface coating powder.
Dependencies are inferred from the claim text.