Bonded adsorbent structures and respirators incorporating same
AssigneeMinnesota Mining and Manufacturing Company
InventorsDavid L. Braun, Peter O. Rekow
Life of this patent
Estimating the term…
Abstract
Shaped porous filtering structures of substantially uniform thickness and density particularly suited for filtration of gases and vapors comprising spaced adsorbent granules unified into a solid, self-sustaining, unitary, impact-resistant body by adherent binder particles. Respirators incorporating such structures as the gas and vapor filtration elements and methods for making the shaped porous filtering structures are disclosed.
Claims19
A porous filtering structure having a panel-like shape which is adapted to be mounted in a respirator across a path for air to be drawn or blown inwardly through the respirator, said panel-like structure:
- having two, opposed large-area surfaces with dimensions larger than the structure's thickness;
- being a unified and impact-resistant structure;
- and
- comprising spaced individual absorbent granules bonded to one another by uniformly distributed, adherent binder particles disposed between said granules wherein said binder particles were in a liquefied state during bonding of the structure, and at least 85 weight percent of the binder particles are larger than 400 mesh.
A porous filtering structure having a panel-like shape which is adapted to be mounted in a respirator across a path for air to be drawn or blown inwardly through the respirator, said panel-like structure:
- having two opposed large-area surfaces with dimensions larger than the structure's thickness;
- being a unified and impact-resistant structure;
- and
- comprising spaced individual absorbent carbon granules bonded to one another by uniformly distributed, adherent polyurethane binder particles disposed between said granules, wherein said binder particles were in a liquefied state during bonding of said structure, and at least 85 weight percent of the binder particles have diameters in the range of 40 to 400 mesh.
A porous filtering structure having a panel-like shape which is adapted to be mounted in a respirator across a path for air to be drawn or blown inwardly through the respirator, said panel-like structure;
- having two opposed large-area surfaces with dimensions larger than the structures thickness;
- being a unified impact-resistant structure;
- and comprising spaced individual absorbent carbon granules bonded to one another by uniformly distributed, adherent ethylene-vinyl acetate binder particles disposed between said granules, wherein said binder particles were in a liquefied state during bonding of said structure, and at least 85 weight percent of the binder particles have diameters in the range of 40 to 90 mesh.
Dependencies are inferred from the claim text.