Dual cure coating composition and processes for using the same
First Claim
1. A coating composition curable upon exposure to both UV radiation and thermal energy, the composition comprising (a1) a radiation curable component which polymerizes upon exposure to UV radiation, comprising (a 11) at least two functional groups comprising at least one bond activatable upon exposure to UV radiation, and (a2) a thermally curable binder component which polymerizes upon exposure to heat, comprising (a21) at least two functional groups reactive with functional groups (a31) of component (a3), and (a22) less than 5% by weight of aromatic ring moieties, based on the nonvolatile weight of thermally curable binder component (a2), and (a3) a thermally curable crosslinking component comprising two or more functional groups reactive with functional groups (a31).
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Abstract
The dual cure coating composition requires electromagnetic radiation and heat energy to cure and comprises a radiation curable component (a1), a thermally curable binder component (a2), and a thermally curable crosslinking component (a3). Radiation curable component (a1) is polymerizable upon exposure to electromagnetic radiation and comprises at least two functional groups (a11) comprising at least one bond activatable with electromagnetic radiation. Thermally curable binder component (a2) is polymerizable upon exposure to heat and comprises (a21) at least two functional groups which are reactive with functional groups (a31) and no more than 5% by weight of aromatic ring moieties (a22), based on the nonvolatile weight of thermally curable binder component (a2). Third component (a3) comprises at least 2.0 isocyanate groups per molecule. The invention further comprises methods of making coated surfaces having both optimum porosity sealing and adhesion.
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30 Claims
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1. A coating composition curable upon exposure to both UV radiation and thermal energy, the composition comprising
(a1) a radiation curable component which polymerizes upon exposure to UV radiation, comprising (a 11) at least two functional groups comprising at least one bond activatable upon exposure to UV radiation, and (a2) a thermally curable binder component which polymerizes upon exposure to heat, comprising (a21) at least two functional groups reactive with functional groups (a31) of component (a3), and (a22) less than 5% by weight of aromatic ring moieties, based on the nonvolatile weight of thermally curable binder component (a2), and (a3) a thermally curable crosslinking component comprising two or more functional groups reactive with functional groups (a31).
Specification