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US 7,611,753 B2Granted
Process for impregnating porous mineral substrates
AssigneeDegussa AG
InventorsBernd Bartkowiak, Kerstin Weissenbach, Nadja Kempkes, Burkhard Standke
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Abstract
A process is provided for impregnating porous mineral substrates by a spray technique in which use is made of a gas-supported spraying assembly to apply liquid impregnating agent in a controlled manner to the substrate surface, the amount consumed being markedly less than the amount consumed in a conventional method of application by a flow-coating process.
Claims40
A process comprising impregnating a porous mineral substrate with a liquid impregnating agent, wherein
- the impregnating comprises spraying the liquid impregnating agent and a gas from a gas-supported spraying assembly;
- and
- the liquid impregnating agent is sprayed from the gas-supported spraying assembly at a pressure of at most 2 bar gauge, wherein
- the gas-supported spraying assembly comprises a nozzle system comprising one or more nozzles;
- the liquid impregnating agent and the gas are fed into each of the one or more nozzles at a pressure of at most 2 bar gauge;
- and
- the gas atomizes the liquid impregnating agent in each of the one or more nozzles, wherein the liquid impregnating agent is substantially free of solvent.
4 more elements
Dependencies are inferred from the claim text.