Drug – bio-affecting and body treating compositions – Solid synthetic organic polymer as designated organic active...
Patent
1993-12-21
1996-09-17
Kulkosky, Peter F.
Drug, bio-affecting and body treating compositions
Solid synthetic organic polymer as designated organic active...
424404, 524323, 524327, 524328, 524329, A61K 4730
Patent
active
055566189
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a material having both an antibacterial activity and an electret property and useable in the fields of filters, food packaging, medical materials, working clothes, and so forth.
BACKGROUND ART
Japanese patent application Kokai publication No. 62-42716 discloses as an antibacterial electret material a filter material formed by subjecting the surface of a fiber to an antibacterial treatment with an antibacterial agent and further subjecting the treated fiber to a treatment for imparting an electret property. In this filter material, however, the volume resistivity of the surface of the fiber was reduced because the antibacterial treatment was conducted by using an organic antibacterial agent and a surfactant for dispersing the antibacterial agent. For this reason, the filter material had a problem that, even after the treatment for imparting an electret property, the quantity of electric charge was small and the charge decayed rapidly.
Japanese patent application Kokai publication No. 3-186309 discloses an air filter comprising an antibacterial nonwoven fabric composed of a fiber and, added thereto, an inorganic antibacterial zeolite and an electret nonwoven fabric laminated on the antibacterial nonwoven fabric. Although this air filter could suppress the propagation of trapped bacteria on the side of the antibacterial nonwoven fabric, it was disadvantageous in that, on the side of the electret nonwoven fabric, trapped bacteria propagated and emitted an offensive odor or rescattered to contaminate the atmosphere of a room. Further, since the electret property was not imparted to the air filter as a whole, the performance of the filter lowered.
Japanese patent application Kokai publication No. 62-42715 discloses a composite material comprising an electret nonwoven material and, superimposed thereon, a nonwoven fabric subjected to an antibacterial treatment. This composite material, however, had a similar drawback.
Studies conducted by the present inventors revealed that the process wherein the formed nonwoven fabric was subjected first to an antibacterial treatment and then to a treatment for imparting an electret property had a fundamental problem that it was difficult to impart a good electret property and, further, since the process time was lengthened, the product cost was increased.
On the other hand, the process wherein the formed nonwoven fabric was subjected first to a treatment for imparting an electret property and then to an antibacterial treatment had a drawback that the antibacterial treatment deteriorated the electret performance and a problem that the process time was similarly lengthened and hence the product cost was increased.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide an antibacterial electret material having a good charge stability and an electret property while maintaining an antibacterial activity.
The antibacterial electret material of the present invention which can attain the above-described object is characterized by having a surface charge density of 1.times.10.sup.-10 C/cm.sup.2 or above and comprising a synthetic organic polymer having a volume resistivity of 10.sup.13 .OMEGA..multidot.cm or above and containing 0.01 to 2% by weight of at least one electret stabilizer selected from the group consisting of a hindered amine compound, a nitrogenous hindered phenol compound, a metallic salt hindered phenol compound, a phenol compound, a sulfur compound and a phosphorus compound and 0.1 to 4% by weight of a metal-ion-containing inorganic compound.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram showing a method of measuring the surface charge density.
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, examples of the synthetic organic polymer having a volume resistivity of 10.sup.13 .OMEGA..multidot. cm or above include polyolefins, polyesters, fluororesins, acrylic resins and polyamide resins, among which polyolefin polymers, such as polyethylene and polyprop
REFERENCES:
patent: 4215682 (1980-08-01), Kubik et al.
patent: 5057710 (1991-10-01), Nishiura et al.
patent: 5112677 (1992-05-01), Tani et al.
C.A. 88:018896 Toray Ind. Jul. '87.
C.A. 108:96155 Ando et al Jul. '87.
C.A. 113:33268 Nishiura et al May '88.
J62282077 (Chem. Abstract) Toray Ind. Dec. '87.
J57021472-A (Mitsui et al) Feb. '82-C.A. 117:192866 Neaga et al. '91.
Ando Katsutoshi
Kondou Goro
Takahashi Masanori
Kulkosky Peter F.
Toray Industries Inc.
LandOfFree
Antibacterial electret material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Antibacterial electret material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antibacterial electret material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-411570