Patent ID: 8557343

Claim:
A method of activating an organic coating present on a substrate to increase adhesion of the organic coating to a further coating and/or to other entities selected from adhesives, sealants, fillers and pressure sensitive decals or logos, the method comprising: applying an activation treatment to the organic coating present on the substrate wherein the activation treatment increases adhesion of a further coating and/or other entities selected from adhesives, sealants, fillers and pressure sensitive decals or logos to the organic coating on the substrate, wherein, the organic coating is a cross-linked organic coating which is a polyurethane, epoxy, polyester and/or acrylic cross-linked coating, and wherein, the activation treatment consists of: an organic solvent selected from ester based solvents, ketones, alcohols, ethers, amides, aromatics and halogenated solvents and combinations thereof; an adhesion promoter selected from linear and branched polyethylene imines (PEI), amine and/or hydroxyl terminated polyether glycols, dendrimers, ethylene diamine, diethylene tetraamine, triethylene tetraamine (TETA), tetraethylene pentamine, pentaethylene hexamine, piperazine, aminoethylpiperazine, 1,4-bis(3-aminopropyl)piperazine, N,N′-bis(3-aminopropyl)ethylenediamine, 4,9-dioxa-1,12-dodecanediamine, 2,2′-(ethylenedioxy)bis(ethylamine), 4,7,10-trioxamidecane-1,13-diamine (TODA), 4,7-dioxadecane-1,10-diamine (DODA), polyetheramine T 403, N,N-bis (3-aminopropyl)-ethylene diamine, 3-2(2-aminoethyl)aminopropyl amine, dipropyltriamine, 4,4′ diamino-dicyclohexylamine, glycidylethers, aziridines and combinations thereof and optionally an additive, wherein contact of the cross-linked organic coating with the solvent or the solvent and adhesion promoter combination results in swelling of the cross-linked organic coating.