초록 ▼

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, thermopla

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.

대표청구항 ▼

1. A porous hydrophobic and/or oleophobic material having a surface energy of from about 5 dynes/cm2to about 30 dynes/cm2which 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 si

1. A porous hydrophobic and/or oleophobic material having a surface energy of from about 5 dynes/cm2to about 30 dynes/cm2which 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. 2. The material of claim 1 wherein the porous thermoplastic substrate is made of a thermoplastic selected from the group consisting of: ethylene vinyl acetate; ethylene methyl acrylate; polyethylenes; polypropylenes; ethylene-propylene rubbers; ethylene-propylene-diene rubbers; poly(1-butene); polystyrene; poly(2-butene); poly(1-pentene); poly(2-pentene); poly(3-methyl-1-pentene); poly(4-methyl-1-pentene); 1,2-poly-1,3-butadiene; 1,4-poly-1,3-butadiene; polyisoprene; polychloroprene; poly(vinyl acetate); poly(vinylidene chloride); and mixtures and derivatives thereof. 3. The material of claim 2 wherein thermoplastic is polyethylene. 4. The material of claim 3 wherein the polyethylene is ultra-high molecular weight polyethylene. 5. The material of claim 1 wherein the high molecular weight fluorochemical is selected from the group consisting of fluorinated acrylates, methacrylates, acrylic esters, and mixtures thereof. 6. The material of claim 5 wherein the high molecular weight fluorochemical is polymerized from a compound selected from the group consisting of: and mixtures thereof, wherein Rfis --CF3(CF2)n,n is an integer of from about 1 to about 18, preferably of from 1 to 4, and R is hydrogen or substituted or unsubstituted alkyl, aryl, or aralkyl. 7. The material of claim 6 wherein the high molecular weight fluorochemical is polymerized from a compound selected from the group consisting of: wherein Rfis --CF3(CF2)n,and n is an integer of from about 1 to about 18. 8. A porous hydrophobic and/or oleophobic material having a surface energy of from about 5 dynes/cm2to about 30 dynes/cm2which 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. 9. 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. 10. The product of the process of claim 9.