Water and oil repellent porous materials and processes for making the same
AssigneePorex Technologies Corp.
InventorLi Yao
Life of this patent
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Abstract
This invention relates to a hydrophobic and oleophobic porous materials and processes for making the same. In a first process of the invention, a thermoplastic substrate is at least partially coated and/or impregnated with a surface treatment material. In a second process of the invention, thermoplastic particles which comprise a surface treatment material are sintered together. Preferred surface treatment materials are fluorochemicals.
Claims10
A porous hydrophobic and/or oleophobic material having a surface energy of from about 5 dynes/cm2 to about 30 dynes/cm2 which comprises a porous thermoplastic substrate having a surface at least part of which is coated with a high molecular weight fluorochemical, wherein the substrate is made by sintering substantially spherical thermoplastic particles.
A porous hydrophobic and/or oleophobic material having a surface energy of from about 5 dynes/cm2 to about 30 dynes/cm2 which comprises a porous thermoplastic substrate having a surface at least part of which is coated with a high molecular weight fluorochemical, wherein the substrate is made by sintering thermoplastic particles formed by underwater pelletizing.
A process for making a porous hydrophobic and/or oleophobic material which comprises contacting a sintered porous thermoplastic substrate with a high molecular weight fluorochemical, wherein the substrate is made of polyethylene.
Dependencies are inferred from the claim text.