Biocidal self-adhesive and process for producing the same, as we

Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Biocides; animal or insect repellents or attractants

Patent

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Details

424405, 424407, 424412, 424413, 4284111, A01N 2534

Patent

active

054179742

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a biocidal self-adhesive comprising an adhesive containing an iso-thiocyanate efficiently held therein to have bacteriostatic, bactericidal and antimicrobial properties and the like, and a process for producing the same, as well as a self-adhesive article made by efficiently applying such a self-adhesive onto a support. Particularly, the present invention relates to such a biocidal self-adhesive which can be put to uses widely intended for the purpose of providing bactericidal, fungicidal and microbiocidal effects in building and food-related fields and the like.
The present invention also relates to an iso-thiocyanate gradually-releasing sheet, as an application of a self-adhesive article of the type described above, made by efficiently holding an iso-thiocyanate onto a support such as a paper, a non-woven fabric or the like through the medium of an adhesive or a low volatile oily liquid, so that the sheet has antibacterial, bactericidal and antimicrobial properties and the like, and particularly, such an Iso-thiocyanate gradually-releasing sheet which can be put to uses widely intended for the purpose of providing bactericidal, fungicidal and microbiocidal effects in various fields such as building, food-related and shoe insole fields.
Further, the present invention relates to a biocidal or freshness-maintaining self-adhesive sheet, as another application of a self-adhesive article of the type described above, having antibacterial and bactericidal properties and made by efficiently applying an adhesive containing an iso-thiocyanate held therein onto a support, and to a sterilizing and freshness-maintaining method using such a sheet for the purpose of providing bactericidal, fungicidal and microbiocidal effects to a variety of materials to be enclosed by the sheet, including food products such as vegetables and fruits, fresh foods, dried goods and grains.


BACKGROUND ART

It is known that an iso-thiocyanate contained in a mustard or a wasabi (i.e., Japanese horseradish) have bacteriostatic and bactericidal actions, and any of the synthetic and natural iso-thiocyanates provides bacteriostatic and bactericidal effects even at an extremely small concentration of vapor thereof on the order of 10-odd ppm to hundreds ppm. Before now, after reporting of this fact, several attempts have been made to adsorb the iso-thiocyanate to a porous carrier such as clay minerals or to a surface of a film or a sheet to industrially utilize the bacteriostatic and bactericidal actions thereof, and a certain article made in such a manner, e.g., a freshness maintaining material, has been brought o market.
In the above prior art, however, it is impossible to utilize the bacteriostatic and bactericidal actions of the iso-thiocyanate profitably. This is because much of the iso-thiocyanate adsorbed in these methods volatilizes off in the course of production of the article or during storage of the article, because of its high volatility, and consequently, an effective amount of iso-thiocyanate cannot be supported on a carrier. Particularly, when the iso-thiocyanate is adsorbed to a porous carrier, it is necessary to take a measure such that the iso-thiocyanate supported on a porous carrier is placed into a sack having a gradually releasing property, because the releasing rate largely depends upon the temperature. When the iso-thiocyanate is adsorbed to a film or a sheet, there is encountered a problem that it is difficult to impregnate the film or the sheet with an amount of iso-thiocyanate sufficient to exhibit an efficacy, but also it is difficult to control the gradual release.
The freshness maintaining means which has conventionally been used is a vacuum pack, or Ageless (Trademark) which is a deoxygenator consisting essentially of active iron oxide, for preventing the oxidation and the propagation of bacteria. However, with the vacuum pack, a special apparatus is required, and with the Ageless, it is necessary to pack the Ageless together with a material to be packed. Many food

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