Composite active filter material

Details Composite active filter material Composite active filter material

1985-01-07

1986-10-28

Cockeram, Herbert S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

131332, 264 453, 264 464, 264 466, 264140, 264DIG13, 425816, 523204, C08G 1814, A24B 1528, B29C 6700

Patent

active

046199489

ABSTRACT:
A reticulated hydrophilic foam substrate and bonded active surface particle powder composite filter material is generated by foam polymerization of a prepolymer phase with an aqueous phase. The reticulated hydrophilic foam substrate is characterized by relatively low pressure drop and low resistance to flow through the foam substrate. The prepolymer phase is a hydrophilic polyurethane prepolymer receptive to the aqueous phase for foam polymerization upon mixing with the aqueous phase. The aqueous phase in turn is a pourable and flowable slurry mixture of water, active surface particle powder, and surfactant wetting agent. The aqueous phase includes sufficient water or other evaporable liquid to provide a protective liquid layer or coating over the active surfaces of the powder particles. Upon polymerization of the mixture the active surface powder particles are distributed over and bonded to the webs of the reticulated hydrophilic foam and the major portion of the active surfaces are free from obstruction and available for active filter functioning. The aqueous phase and prepolymer phase upon mixing may be poured, flowed, or injected into a suitable respirator or mask mold to provide a lightweight single piece respirator face mask.

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