Patent ID: 11859102
Assignee: ISG ISOLIERCHEMIE GMBH & CO. KUNSTSTOFF KG
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A solvent-free undercoat composition for corrosion control at welds on plastic-sheathed steel pipes with and without cathodic protection, the composition comprising:
a component K1 being a water-based rubber dispersion with a rubber from the group of butyl, bromobutyl, isoprene or chloroprene rubber or combinations thereof, for formation of a barrier layer for isolating the welds from oxygen, water vapor and water penetrating from externally;
a component K2 being a water-based resin dispersion comprising a hydrocarbon resin and/or a natural resin, for adhesion on a metallic surface of the welds and on nonpolar surfaces of the plastic sheathing; and
a component K3 being an aqueous emulsion of prehydrolyzed organofunctional silanes for accelerating drying, for improving the adhesion to the metallic surface, and for increasing resistance to cathodic disbondment,
wherein the following fractions of the components, specified in each case as solids content are based on the total mass of the dried undercoat:
component K1 with a fraction of 10 wt % to 60 wt %;
component K2 with a fraction of 20 wt % to 90 wt %; and
component K3 with a fraction of 0.1 wt % to 10 wt %.