Method of applying removable coating compositions
AssigneeRohm and Haas Company
InventorsAlan Wayne Kohr, Theodore Tysak
Life of this patent
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Abstract
A method of applying coating composition is described in which the coating composition comprises a multi-stage emulsion polymer that is both radiation curable, removable and includes chemically reactive functional groups in the coating that react with one or more conventional chemical stripping agents, effecting the removal of the coating from a substrate. The UV curable and removable composition is included within one or more layers applied on top of a substrate or on top of a base coat that itself is disposed on top of a substrate.
Claims19
A method for applying a UV cured, highly cross-linked coating as one or more layers to a substrate and subsequently removing all coating layers from a substrate comprising the steps of:
- (a) applying one or more layers of a coating comprising a curable, removable multi-stage emulsion polymer;
- wherein a shell of said multi-stage emulsion polymer comprises a carboxylic acid-containing emulsion polymer that comprises, as polymerized units, one or more comonomers having carboxylic acid functionality, and
- wherein said multitstage emulsion polymer further comprises 5 to 80 percent, based on equivalents of acid groups, polyvalent metal ion,
- (b) curing the composition to form a highly cross-linked coating over the substrate by exposing the composition to ultraviolet radiation;
- and
- (c) removing all coating layers from the substrate by exposing the coating to one or more chemical stripping agents.
A method for preparing a UV curable and removable multi-layer coating comprising
- (a) applying one or more layers of a base coat to a substrate wherein the base coat comprises a polymer product having a gel fraction of 0.3 to 0.95 in a solvent selected from one or more of acetone and tetrahydrofuran,
- wherein said polymer product is a dispersion of water-insoluble multi-stage latex polymer particles,
- and wherein the base coat is applied in one or more separate applications, allowing the base to dry after each application;
- and
- (b) applying one or more layers of a coating comprising a curable, removable multi-stage emulsion polymer.
Dependencies are inferred from the claim text.