Back to results
US 12,678,724 B2Granted
Filter material for air filter and method for producing filter material
AssigneeHokuetsu Corporation
InventorsNozomi Tashiro, Masashi Sato
Life of this patent
Estimating the term…
Abstract
A filter medium for an air filter is composed of a wet-laid nonwoven fabric. The filter medium contains a binder resin and a water repellent. The water repellent contains, as a main component, a hydrocarbon-based polymer free of fluorine and silicon in a molecule thereof. The binder resin and the water repellent are crosslinked by an isocyanate crosslinking component.
Claims12
A filter medium for an air filter composed of a wet-laid nonwoven fabric, wherein
- the filter medium for an air filter contains a binder resin and a water repellent,
- the water repellent contains, as a main component, a hydrocarbon-based polymer free of fluorine and silicon in a molecule thereof, and
- the binder resin and the water repellent are crosslinked by an isocyanate crosslinking component.
A method for producing a filter medium for an air filter, the method comprising the steps of:
- forming a sheet in a wet state by forming a fiber slurry into the sheet by a wet papermaking method;
- impregnating the sheet in a wet state with an aqueous dispersion containing a binder resin, a water repellent containing, as a main component, a hydrocarbon-based polymer free of fluorine and silicon in a molecule thereof, and an isocyanate crosslinking component;
- and
- obtaining a dry sheet by heating and drying the sheet in a wet state impregnated with the aqueous dispersion, and by crosslinking the binder resin and the water repellent by the isocyanate crosslinking component.
1 more element
Dependencies are inferred from the claim text.