Drug – bio-affecting and body treating compositions – Inorganic active ingredient containing – Heavy metal or compound thereof
Patent
1997-11-13
2000-06-06
Pak, John
Drug, bio-affecting and body treating compositions
Inorganic active ingredient containing
Heavy metal or compound thereof
423700, 424617, 424630, 424641, 424644, 424646, 424650, 424652, 424653, 424654, 424655, 424682, 514970, 514972, A01N 5916, C08K 334, C08K 906, C09C 140
Patent
active
060715421
DESCRIPTION:
BRIEF SUMMARY
FIELD
The present invention relates to antibacterial zeolite exhibiting a less action of discoloring an organic polymer containing the antibacterial zeolite when the polymer composition is placed under the influence of heat or the sunshine, and to a process for the preparation of the same.
BACKGROUND
It has been known for a long time that silver ion, copper ion, or zinc ion, etc. has antibacterial properties. For example, the silver ion has been widely used in the form of a solution of silver nitrate as a disinfectant or antibacterial agent. However, such a solution form is inconvenient for handling and restricted in use. In order to eliminate these disadvantages, a product in which metal ions are supported in a solid such as zeolite was developed. For example, French Patent Application No. 1,061,158 describes paint for ships containing 20 to 30% by weight of zeolite which is saturated with copper, zinc or silver. In Japanese Patent Publication No. Sho-63-54013/1988, Japanese Patent Application Laid-Open Nos. Sho-63-260810/1988 and Sho-63-270764/1988, there is described a zeolite composition in which antibacterial properties are further improved.
There was proposed antibacterial zeolite which did not discolor by ultraviolet light such as the sunshine with the passage of time (Japanese Patent Application Laid-Open No. Sho-63-265809/1988). This application relates to antibacterial zeolite in which a part or the whole of ion-exchangeable ions in the zeolite is substituted with ammonium ions and antibacterial metal ions and to an antibacterial polymer composition. However, this antibacterial zeolite has some disadvantages. That is, the zeolite is lacking in heat stability when only silvers are supported as the antibacterial metal. The zeolite itself discolors to become mud yellow color when heated to 300.degree. C., particularly when A-type zeolite is used. Therefore, when it is kneaded into a polypropylene resin at a kneading temperature of 240.degree. C., it makes the resin light brown. This disadvantage causes the zeolite to lose its commercial value.
It is known that antibacterial zeolite particles having silicone-type coating may be prepared by treating the antibacterial zeolite particles with a solution of a silicone-type coating agent (Japanese Patent Publication No. Hei-3-80814/1991). In these particles, their hygroscopic property is suppressed to a degree needed. They have hydrophobic property or water repellent property. Accordingly, these particles have an advantage that molding may be advantageously carried out because they do not release water when they are blended with an organic polymer to be molded.
DISCLOSURE OF THE INVENTION
A purpose of the present invention is to provide such antibacterial zeolite that when the zeolite is blended with organic polymers, particularly with high performance engineering plastic polymers having high melting points such as ABS resins, polyester resins and polyamide resins, or with paper, the zeolite makes the organic polymer composition quite less discolored under the influence of heat during processing or under ultraviolet light such as the sunshine, and to provide a process for the preparation of the same.
The present inventors have found that the particular composition which will be described below penetrates into micropores of zeolite well and then may cover the surface of the zeolite completely. We have also found that when a predetermined amount of the aforesaid composition is used, the discoloration may be effectively suppressed without decreasing the intrinsic antibacterial properties that the antibacterial zeolite has. These findings lead to the completion of the invention.
That is, the present invention is antibacterial zeolite exhibiting a less discoloring action, obtained by treating the surface of zeolite supporting an antibacterial metal with 0.5 to 20% by weight, based on said zeolite, of a composition comprising (A) 100 parts by weight of a hydrolyzable silane and/or oligomer thereof which comprises 10 to 100% by weight of a hydrolyzable sil
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patent: 5661196 (1997-08-01), Mayer et al.
Tanimoto et al., JP406247816A, Production of antimicrobial zeolite reduced in discoloration action, Sep. 6, 1994, Messenger APS online, Abstract.
Matsuo Ryuhei
Nagata Manabu
Nakashima Kazuhiko
Otani Tatsuo
Shingai Yuji
Choi Frank
Dippert William H.
Kanebo Ltd.
Pak John
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