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US 12,760,129 B2Granted
Oleophobic fluoropolymers and fibrous materials prepared therefrom
AssigneeEntegris, Inc.
InventorsMei Feng He, Dongzhu Wu, Yunjia Xia, Kwok-Shun Cheng
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Abstract
The disclosure provides a process for preparing an oleophobic fluoropolymer emulsion. The resulting fluoropolymer emulsion has excellent hydrophobic and oleophobic modification ability (as coatings) on polyester fibers such as polyester (PET), polypropylene (PP) and woven and nonwoven fabrics. Accordingly, the woven and nonwoven materials so coated are useful in venting filter applications.
Claims17
A process for preparing a fluoropolymer emulsion, comprising the aqueous free-radical polymerization of monoethylenically-unsaturated monomers, by combining components comprising:
- a. greater than 60 to about 100 weight percent of a fluorine-containing monoethylenically-unsaturated monomer;
- b. less than 40 to about 0 weight percent of a fluorine-free monoethylenically-unsaturated monomer,
- wherein fluorine-containing monoethylenically-unsaturated monomer and the fluorine-free monoethylenically-unsaturated monomer are devoid of other halogen atoms;
- and
- c. a surfactant, wherein the total of a. and b. is 100 weight percent, thereby providing a mixture, and wherein the mixture is subjected to ultrasonic vibration at an intensity and for a period of time sufficient to form a pre-emulsion, followed by subjecting the mixture to free-radical polymerization conditions and allowing the polymerization to proceed to a desired end point.
2 more elements
Dependencies are inferred from the claim text.