Uniformly tacky filter media
AssigneeSuperior Fibers, LLC
InventorWilliam R. Miller
Life of this patent
Estimating the term…
Abstract
A filter medium, a tackified binder composition and a method for providing a uniformly distributed tackifier on the glass fibers of an unwoven fiberglass web for improving filtration capacity and efficiency. An emulsified tackifier, such as polybutene, is mixed with a conventional binder composition and applied to the fibers before they are expanded into the web. The binder is cured in the conventional manner and the tackifier migrates to the surface on each fiber to enhance particle adsorption.
Claims14
A method for preparing a nonwoven, glass fibrous web filter material having a tacky surface film on fibers distributed throughout the web, the method comprising:
- (a) applying to glass fibers a mixture of a urea formaldehyde binder composition and a polybutene tackifier which is immiscible in the binder, has sufficient fluidity to separate from the binder, and is sufficiently nonvolatile to remain in the mixture and not cross link with the binder when the binder is subjected to a binder curing temperature;
- (b) forming said fibers into a fibrous web;
- and
- (c) curing the binder in the fibrous web to bond the fibers at their intersections.
A method for preparing a nonwoven, glass fibrous web filter material having a tacky surface film on fibers distributed throughout the web, the method comprising:
- (a) applying to glass fibers a mixture of a melamine formaldehyde binder composition and a polybutene tackifier which is immiscible in the binder, has sufficient fluidity to separate from the binder, and is sufficiently nonvolatile to remain in the mixture and not cross link with the binder when the binder is subjected to a binder curing temperature;
- (b) forming said fibers into a fibrous web;
- and
- (c) curing the binder in the fibrous web to bond the fibers at their intersections.
Dependencies are inferred from the claim text.