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US 4,200,671 AGranted
Method for removing paint from a substrate
AssigneeThe Dow Chemical Company
InventorsRichard M. Krajewski, Robert E. Erickson
Life of this patent
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Abstract
Hydrophobic materials deposited on the surface of a substrate having a primer release coating of a water-insoluble, water-swellable polymer can easily be removed from the substrate upon exposure of the water-swellable polymer to an aqueous liquid. For example, paint applied to the surface of a steel panel precoated with a lightly cross-linked polyacrylate can easily be removed upon the immersion of the panel in water.
Claims8
A method of removing depositions of hydrophobic material from a substrate comprising the steps of:
- (a) applying a primer release coating of a water-insoluble, water-swellable polymer to the substrate,
- (b) depositing the hydrophobic material on the primer release coating,
- (c) loosening the hydrophobic material by exposing the primer release coating to excessive amounts of an aqueous liquid, and
- (d) removing the hydrophobic material from the substrate.
1 more element
Dependencies are inferred from the claim text.