Method for curing a rma crosslinkable resin coating, rma crosslinkable compositions and resins for use therein
AssigneeAllnex Netherlands B.V.
InventorsMichael Anthony GESSNER, Dirk Emiel Paula Mestach, Ramesh Subramanian, William Jay Degooyer, Ajaya Nanda, Eric Matthew McCracken
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Abstract
The invention relates to a method for dual curing a RMA crosslinkable resin coating, to RMA crosslinkable compositions and to resins for use in the method.
Claims25
A method for curing of a coating of a RMA crosslinkable composition involving two or more different curing mechanisms, said RMA crosslinkable composition comprising at least one crosslinkable component comprising reactive components A and B each comprising at least 2 reactive groups wherein the at least 2 reactive groups of component A are acidic protons (C—H) in activated methylene or methine groups (RMA donor group), and the at least 2 reactive groups of component B are activated unsaturated groups (C═C) (RMA acceptor group) which reactive groups react to achieve crosslinking by Real Michael Addition (RMA) reaction in the presence of a base catalyst (C), said method involving the steps of
- a. Providing a RMA crosslinkable composition
- b. Applying a layer of said RMA crosslinkable composition
- c. Allowing curing of the layer by RMA crosslinking
- d. Before during or after said RMA crosslinking applying a second crosslinking reaction step,
- wherein the two or more different curing mechanisms involve
- a. RMA crosslinking in combination with a second crosslinking reaction between hydroxy groups on the RMA crosslinkable components with polyisocyanates or siloxanes or
- b. RMA crosslinking in combination with a second crosslinking reaction with polyamines, with crosslinkable components comprising component B and/or with epoxy groups on the RMA crosslinkable components
- c. RMA crosslinking in combination with a second crosslinking reaction based on auto-oxidative drying of unsaturated groups on the RMA crosslinkable components or,
- d. RMA crosslinking in combination with a second radical crosslinking reaction of reactive components B on the RMA crosslinkable components and/or optional other radical crosslinkable polymer components, preferably by UV curing or by thermal curing preferably with peroxy, or
- e. Combinations thereof
- wherein said second crosslinking reaction step is performed before, during or after the RMA curing.
Dependencies are inferred from the claim text.