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US 6,486,291 B2Granted
Coated porous materials
AssigneeInnovative Properties Company
InventorsJames S. Mrozinski, Malcolm B. Burleigh, Philip D. Radovanovic, Brian D. Johnson
Life of this patent
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Abstract
Coated porous materials that exhibit air permeability and repellency to liquids having a surface tension at least equal to or greater than 20 dynes/cm which are suitable for making ileostomy vent filters, transdermal drug substrates, agricultural and medical apparel, as well as paint and chemical protective garments. The coating for the porous material is applied as a curable composition containing fluorocarbon urethane precursors which are cross-linked in situ.
Claims10
A method of making a coated porous material comprising:
- applying a curable crosslinkable coating composition comprising fluorocarbon urethane precursors including:
- (a) a polyisocyanate;
- (b) a polyhydric alcohol;
- wherein at least one member of (a) or (b) has a functionality of greater than 2, and
- (c) a perfluoroalkyl alcohol of the formula
- R—(CH2)x—OH,
- in which R is
- where x is 1-12;
- n is 3-20, and R1 is H, alkyl of 1 to 4 carbon atoms or —(CH2)x—OH in an organic solvent, to a porous material in an amount sufficient to cover the material, and drying the coating sufficient to remove the solvent and to promote curing or cross-linking, to produce a coated material which exhibits air permeability and repellency to liquids having a surface tension of equal to or greater than 20 dynes/cm.
6 more elements
Dependencies are inferred from the claim text.