Filter media and articles including dendrimers and/or other components

Abstract

Articles such as filter media, which include dendrimers and/or other components, are provided. The filter media may further include a water repellant (e.g., a fluorinated species) to impart desirable properties to the media such as high water repellency. The filter media may also have a high efficiency as a function of pressure drop (i.e., high gamma values). In some embodiments, the filter media includes a fiber web which may be formed of various components such as glass fibers. The fiber web can also include additional components such as synthetic fibers, binder components, as well as other additives. The media may be incorporated into a variety of filter element products.

What is claimed is: 
     
         1 . (canceled) 
     
     
         2 . An article, comprising:
 a fiber web comprising a plurality of glass fibers having an average diameter between about 0.01 and about 10 microns and a hydrophobic water repellant compound comprising the formula —C n F m R y , wherein n is an integer less than or equal to 6, m is an integer greater than 1, R is zero, an atom or a group of atoms, and y is an integer greater than or equal to 0, and wherein the water repellant is hydrophobic in an aqueous environment,   wherein the article has a basis weight between about 10 and about 1000 gsm, an overall thickness between about 100 microns and about 5000 microns, an overall pressure drop between about 5 Pa and about 700 Pa, and a −log [(DOP penetration %/100)/pressure drop, Pa)]×100×9.8 value of at least 8, measured using DOP aerosol particles approximately 0.3 microns in diameter at a media face velocity of approximately 5.3 cm/sec.   
     
     
         3 . (canceled) 
     
     
         4 . An article, comprising:
 a fiber web comprising a plurality of glass fibers having an average diameter between about 0.01 and about 10 microns and a water repellant comprising a branched polymer comprising a fluorophilic oligomeric component and a hydrocarbon oligomeric component, wherein the fluorophilic oligomeric component comprises the formula —C n F m R y , wherein n is an integer less than or equal to 6, m is an integer greater than 1, R is zero, an atom or a group of atoms, and y is an integer greater than or equal to 0,   wherein the article has a basis weight between about 10 and about 1000 gsm, an overall thickness between about 100 microns and about 5000 microns, an overall pressure drop between about 5 Pa and about 700 Pa, and a −log [(DOP penetration %/ 100 )/pressure drop, Pa)]×100×9.8 value of at least 8, measured using DOP aerosol particles approximately 0.3 microns in diameter at a media face velocity of approximately 5.3 cm/sec.   
     
     
         5 . An article as in  claim 2 , wherein the fiber web further comprises a polysiloxane. 
     
     
         6 . An article as in  claim 2 , wherein the water repellant comprises a hydrocarbon component. 
     
     
         7 . An article as in  claim 6 , wherein the hydrocarbon component is an alkyl component. 
     
     
         8 . An article as in  claim 2 , wherein the article has a basis weight between about between about 25 gsm and about 500 gsm. 
     
     
         9 . An article as in  claim 2 , wherein the water repellant comprises the formula —C 6 F 13 . 
     
     
         10 . The article of  claim 2 , wherein the article has a (−log(DOP penetration %/100)/pressure drop, Pa)×100×9.8 value from about 8 to about 30. 
     
     
         11 . The article of  claim 2 , wherein the article has a water repellency of greater than about 9.5 kPa and up to about 20 kPa. 
     
     
         12 . The article of  claim 2 , wherein the fiber web comprises a crosslinking agent. 
     
     
         13 . The article of  claim 12 , wherein the crosslinking agent is present in a range of between about 0.01% and about 2.0% of the total dry weight of the fiber web. 
     
     
         14 . The article of  claim 2 , wherein the article is an air filter medium or element. 
     
     
         15 . The article of  claim 2 , wherein the plurality of glass fibers have an average diameter between 0.4 and 6 microns. 
     
     
         16 . The article of  claim 2 , comprising more than one fiber web layers. 
     
     
         17 . The article of  claim 2 , wherein the water repellant is a branched polymer. 
     
     
         18 . The article of  claim 2 , further comprising a crosslinked surface modifier comprising the water repellant. 
     
     
         19 . The article of  claim 18 , wherein the water repellant is a branched polymer, the water repellant comprises the formula —C 6 F 13 , and the water repellant comprises an alkyl component. 
     
     
         20 . The article of  claim 19 , wherein the article has a basis weight between about 30 and about 400 gsm. 
     
     
         21 . The article of  claim 19 , wherein the fiber web further comprises a polysiloxane. 
     
     
         22 . (canceled) 
     
     
         23 . The article of  claim 2 , wherein the water repellant comprises a hydrocarbon component, wherein the water repellant comprises the formula —C 6 F 13 , wherein the article has a basis weight between about between about 10 gsm and about 500 gsm, and wherein the plurality of glass fibers have an average diameter between about 0.4 microns and about 8.0 microns. 
     
     
         24 . The article of  claim 23 , wherein the fiber web further comprises a polysiloxane. 
     
     
         25 . The article of  claim 21 , wherein the article has a basis weight between about between about 10 gsm and about 500 gsm, and wherein the plurality of glass fibers have an average diameter between about 0.4 microns and about 8.0 microns. 
     
     
         26 . The article of  claim 10 , wherein the article has a basis weight between about between about 10 gsm and about 500 gsm. 
     
     
         27 . The article of  claim 10 , wherein the plurality of glass fibers have an average diameter between about 0.4 microns and about 8.0 microns. 
     
     
         28 . The article of  claim 10 , wherein the fiber web comprises a crosslinking agent. 
     
     
         29 . The article of  claim 28 , wherein the crosslinking agent is present in a range of between about 0.01% and about 2.0% of the total dry weight of the fiber web. 
     
     
         30 . The article of  claim 10 , wherein the article has a water repellency of between about 1 kPa and about 20 kPa. 
     
     
         31 . The article of  claim 10 , wherein the fiber web further comprises a polysiloxane. 
     
     
         32 . The article of  claim 10 , wherein the article has a basis weight between about between about 10 gsm and about 500 gsm, wherein the plurality of glass fibers have an average diameter between about 0.4 microns and about 8.0 microns, wherein the fiber web comprises a crosslinking agent, the crosslinking agent being present in a range of between about 0.01% and about 2.0% of the total dry weight of the fiber web, wherein the article has a water repellency of between about 1 kPa and about 20 kPa, and wherein the fiber web further comprises a polysiloxane. 
     
     
         33 . The article of  claim 2 , wherein the article has a (−log(DOP penetration %/100)/pressure drop, Pa)×100×9.8 value from about 8 to about 20. 
     
     
         34 . The article of  claim 33 , wherein the article has a basis weight between about between about 10 gsm and about 500 gsm. 
     
     
         35 . The article of  claim 33 , wherein the plurality of glass fibers have an average diameter between about 0.4 microns and about 8.0 microns. 
     
     
         36 . The article of  claim 33 , wherein the fiber web comprises a crosslinking agent. 
     
     
         37 . The article of  claim 36 , wherein the crosslinking agent is present in a range of between about 0.01% and about 2.0% of the total dry weight of the fiber web. 
     
     
         38 . The article of  claim 33 , wherein the article has a water repellency of up to about 20 kPa. 
     
     
         39 . The article of  claim 33 , wherein the fiber web further comprises a polysiloxane. 
     
     
         40 . The article of  claim 10 , wherein the article has a basis weight between about between about 10 gsm and about 500 gsm, wherein the plurality of glass fibers have an average diameter between about 0.4 microns and about 8.0 microns, wherein the fiber web comprises a crosslinking agent, the crosslinking agent being present in a range of between about 0.01% and about 2.0% of the total dry weight of the fiber web, wherein the article has a water repellency of up to about 20 kPa, and wherein the fiber web further comprises a polysiloxane. 
     
     
         41 . The article of  claim 32 , wherein the article has a water repellency of between about 5 kPa and about 20 kPa. 
     
     
         42 . The article of  claim 32 , wherein the article has a water repellency of between about 9.5 kPa and about 20 kPa.