Method for coating substrates
AssigneeBASF SE
InventorsErich Beck, Friedrich-Wilhelm Raulfs, Karl Siemensmeyer
Life of this patent
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Abstract
The present invention relates to a method of coating substrates, including the following steps: a. applying a flowable coating composition to the target substrate and b. curing the resulting wet coating by exposure to high energy radiation, wherein said coating composition comprises as binder a polymer A containing less than 1 mol/(kg of polymer A) of reactive groups, selected from ethylenically unsaturated double bonds and epoxy groups, and at least 2 mol/(kg of polymer A) of functional groups of the formula where Y is N—H or oxygen.
Claims13
A method of coating including the following steps:
- a. applying a flowable coating composition to the target substrate by an ink-jet process;
- and
- b. curing the resulting wet coating by exposure to U.V. radiation,
- wherein said coating composition is free of any photoinitiators and comprises as binder a polymer A containing less than 1 mol/(kg of polymer A) of reactive groups, selected from ethylenically unsaturated double bonds and epoxy groups, and at least 2 mol/(kg of polymer A) of functional groups of the formula
- where
- Y is N—H or oxygen, which are embodied in the substructures of the formulae IA, IB and/or IC
- where
- R and R′ independently of one another are hydrogen or C1-C4-alkyl
- R″ is C1-C20-alkyl,
- Y is as defined above, and
- n is 0 or 1,
- the structural units of the formula IA, IB or IC being constituents of the polymer chain.
A method as claimed in any of the preceding claims, wherein said coating composition contains from 10 to 90% by weight, based on the binder constituent in the coating composition, of at least one further, ethylenically unsaturated cobinder selected from ethylenically unsaturated prepolymers having a double bond content of at least 2 mol/kg of (pre)polymer, mono- or polyethylenically unsaturated monomers, and mixtures thereof.
Dependencies are inferred from the claim text.