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US 5,296,282 AGranted
Degradable repellant coated articles
AssigneeE. I. Du Pont de Nemours and Company
InventorGlenn R. Evers
Life of this patent
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Abstract
Shaped articles having a substrate of a degradable synthetic polymeric material and a discontinuous liquid repellant hydrophobic and/or oleophobic surface layer.
Claims19
An article comprising:
- (a) a substrate comprising a poly(hydroxy acid) selected from the group consisting of (1) poly(lactic acid), (2) poly(glycolic acid), (3) copolymers of lactic acid and glycolic acid, and (4) copolymers of lactic acid with a monomer selected from the group consisting of epsilon-caprolactone, beta-propiolactone, alpha,alpha-dimethyl-beta-propiolactone, and dodecanolactone;
- the substrate comprising at least one surface;
- (b) a surface layer of a repellant material on at least one surface of the substrate, wherein the surface layer is:
- (1) capable of preventing aqueous media from wetting the substrate;
- (2) substantially discontinuous, giving coated and uncoated substrate areas, the coated areas comprising at least 80% of the substrate surface bearing the surface layer;
- and
- (3) sufficiently discontinuous to permit biodegradation of the substrate or penetration of water vapor into the substrate;
- wherein the repellant material has a critical surface tension of 5 to 54 dynes/cm.
5 more elements
Dependencies are inferred from the claim text.