Filtering material of apatite and glucan used for surgical masks and method of making it

• US 5,143,752 A
• Filed: 01/30/1992
• Issued: 09/01/1992
• Est. Priority Date: 01/30/1992
• Status: Expired due to Fees

• Current Assignee: Bestex Kabushiki-Kaisha
• Original Assignee: Bestex Kabushiki-Kaisha
• Inventors: Nakajima, Tooru, Tsuru, Sumiaki
• Primary Examiner(s): Dawson, Robert A.
• Assistant Examiner(s): DRODGE, JOSEPH W
• Application Number:
  US07/828,359
• Time in Patent Office: 215 Days
• Field of Search: 55/522, 55/524, 55/527, 55/528, 55/DIG. 35, 2/9, 128/206.19, 210/500.1, 210/500.29, 210/502.1, 210/504, 210/506, 210/508, 427/209, 427/244, 427/245, 427/421, 427/427, 427/430.1, 428/283, 428/288, 428/319.1, 428/311.1, 428/311.7, 423/308, 423/311
• US Class Current: 427/244
• CPC Class Codes: A41D 13/11 Protective face masks, e.g. for surgical use, or for use in foul atmospheres eye-masks A61F9/04 ; hoods affording protection against heat or harmful chemical agents A62B17/04
• CPC Class Codes: B01D 2239/0407 comprising particulate additives, e.g. adsorbents apparatus incorporating gas filtering material B01D46/0036
• CPC Class Codes: B01D 2239/0478 on a layer of the filter
• CPC Class Codes: B01D 2239/086 Binders between particles or fibres
• CPC Class Codes: B01D 39/083 of organic material
• CPC Class Codes: B01D 39/1607 the material being fibrous B01D39/18 takes precedence
• CPC Class Codes: B01D 39/2079 otherwise bonded, e.g. by resins
• CPC Class Codes: B01J 20/048 containing phosphorus, e.g. phosphates, apatites, hydroxyapatites
• CPC Class Codes: B01J 20/22 comprising organic material
• CPC Class Codes: B01J 20/28026 Particles within, immobilised, dispersed, entrapped in or on a matrix, e.g. a resin
• CPC Class Codes: B01J 20/28028 Particles immobilised within fibres or filaments
• CPC Class Codes: B01J 20/2803 Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
• CPC Class Codes: B01J 20/28033 Membrane, sheet, cloth, pad, lamellar or mat
• CPC Class Codes: B01J 20/3208 Polymeric carriers, supports or substrates
• CPC Class Codes: B01J 20/3236 containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
• CPC Class Codes: B01J 2220/4831 having been subjected to further processing, e.g. paper, cellulose pulp
• CPC Class Codes: Y10T 442/2508 Coating or impregnation absorbs chemical material other than water
• CPC Class Codes: Y10T 442/2525 Coating or impregnation functions biologically [e.g., insect repellent, antiseptic, insecticide, bactericide, etc.]

Abstract

A filtering material for effectively adsorbing not only conventional foreign material such as dust, odoring gaseous substance but also very fine foreign material such as virus, bacteria, fungus, pollen or the like is disclosed. The filtering material includes as essential components porous apatite particles, a water soluble glucan and a sheet-shaped raw material in which the porous apatite particles are included with the aid of the water soluble glucan serving as a binder. A method of producing a filtering material of the foregoing kind is practiced by way of a step of preparing an aqueous treatment solution in which porous apatite particles of 0.5 to 40% by weight and a water soluble glucan of 0.5 to 15% by weight are dispersively dissolved, a step of immersing a sheet-shaped raw material in the aqueous treatment solution, and a step of drying the sheet-shaped raw material while the porous apatite particles are included in the sheet-shaped raw material with the aid of the water soluble glucan serving as a binder. Alternatively, a step of spraying the aqueous treatment solution to surfaces of a sheet-shaped raw material may be substituted for the step of immersing a sheet-shaped raw material in the aqueous treatment solution. It is preferable from the viewpoint of practice use that the porous apatite particles make up between 0.5 and 30% of the treatment solution.

Claims

1. Filtering material comprising;

porous apatite particles,

a water soluble glucan, and

a sheet-shaped raw material in which said porous apatite particles are contained aided by said water soluble glucan having a property of a binder.

2. A method of producing a filtering material, comprising;

a step of preparing an aqueous treatment solution in which porous apatite particles of 0.5 to 40% by weight and a water soluble glucan of 0.5 to 15% by weight are dispersively dissolved,

a step of immersing a sheet-shaped raw material in said aqueous treatment solution to result in containing of said particles aided by said glucan having a property of a binder, and

a subsequent step of drying said sheet-shaped material.

3. The method as claimed in claim 2, wherein said porous apatite particles are contained in said aqueous treatment solution in a quantity of 0.5 to 30% by weight.

4. A method of producing a filtering material, comprising;

a step of preparing an aqueous treatment solution in which porous apatite particles of 0.5 to 40% by weight and a water soluble glucan of 0.5 to 15% by weight are dispersively dissolved,

a step of spraying said aqueous treatment solution to surfaces of a sheet-shaped raw material, and

a step of drying said sheet-shaped raw material after said solution has been sprayed on said surfaces of said sheet-shaped raw material.

5. The method as claimed in claim 4, wherein said porous apatite particles are included in said aqueous treatment solution by a quantity of 0.5% to 30% in weight.