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US 6,306,989 B1Granted
Situ fluoropolymer polymerization into porous substrates
AssigneeE. I. Du Pont de Nemours and Company
InventorsJoy Sawyer Bloom, Kiu-Seung Lee, Robert Clayton Wheland
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Abstract
The present invention relates to in situ polymerization of fluoropolymer into porous substrates, to improve resistance to wear, tear and creep, decay, and degradation by wetting, staining and warping, and to improve durability while maintaining the appearance of the substrate.
Claims16
A process for preparing a fluoropolymer/substrate composition, comprising:
- in the case of gaseous fluoromonomer
- (a) contacting a porous substrate with a solution comprising an initiator dissolved in a suitable solvent;
- (b) exposing said substrate and said initiator to gaseous fluoromonomer under polymerization temperature and pressure conditions wherein the fluoromonomer polymerizes into said substrate;
- or in the case of liquid, fluoromonomer
- (a) preparing a solution comprising initiator and liquid fluoromonomer;
- (b) contacting a porous substrate with said solution;
- and
- (c) polymerizing the liquid fluoromonomer under polymerization temperature and pressure conditions wherein the fluoromonomer polymerizes into said substrate, optionally in the presence of gaseous fluoromonomer.
5 more elements
Dependencies are inferred from the claim text.