Filter medium for air filter and method for its production

Details Filter medium for air filter and method for its production Filter medium for air filter and method for its production

2005-09-06

2005-09-06

Smith, Duane (Department: 1724)

Gas separation

Specific media material

With coating, impregnant, or bonding agent

C055S527000, C055SDIG005, C428S436000, C442S176000, C442S180000, C065S443000, C065S447000, C065S450000

Reexamination Certificate

active

06939386

ABSTRACT:
A filter medium for an air filter, characterized in that it comprises a filter material having a glass fiber as its primary component and an alkyl ketene dimer adhered to the surface of the glass fiber; and a method for producing the filter medium which comprises a step of subjecting a dispersed slurry of a raw material fiber to a wet papermaking to form a wet paper, a step of immersing the wet paper in an aqueous dispersion or solution of the dimer or a liquid mixture of the dimer and a binder resin, or applying or spraying any of the above-mentioned liquids to the wet paper, to thereby allow the dimer to adhere onto the surface of the glass fiber, and a step of drying the resultant wet paper having the dimer adhered thereto. The filter medium exhibits a reduced amount of an out gas generated when it is used with ventilation and also exhibits high water-repellency and satisfactory strength in various applications such as air conditioning of a building and semiconductor manufacturing.

REFERENCES:
patent: 4721655 (1988-01-01), Trzasko et al.
patent: 4775560 (1988-10-01), Katsura et al.
patent: 47-43266 (1972-11-01), None
patent: 04-210727 (1992-07-01), None
patent: 6-30868 (1994-02-01), None
patent: 06-131993 (1994-06-01), None
patent: 08-034962 (1996-02-01), None
patent: 9-225226 (1997-09-01), None

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