Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1991-04-01
1993-05-25
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
1510493, 428246, 428283, 428284, 428287, 4283044, 428323, 428341, 4285371, B32B 516
Patent
active
052138844
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a tissue suitable for use in the disinfection of hard surfaces, instruments and human or animal skin or as a sheet inclusion in a washing process for the purpose of disinfection or bleaching.
In our United Kingdom Patent Application No. 8727915 is described a disinfecting wipe or sheet inclusion in which a nonwoven lofted substrate is used to entrap solid particles of a chlorine releasing agent within the matrix of fibres forming its structure. The solid particles are activated to release chlorine when dampened with a suitable liquid to provide the desired disinfecting or bleaching effect.
The advantage of this product is that hitherto no similar product had been produced which utilised chlorine as a disinfecting agent. Chlorine is an effective, fast-acting surface disinfectant which can be used to kill a wide spectrum of micro-organism without leaving a sticky or smearing residue but previous methods of impregnating or coating substrates with chlorine releasing chemicals had not resulted in a stable or effective product with an appreciable shelf life.
The disadvantages of the product described in our aforementioned patent application is that it is comparatively expensive as a result of the substrate material employed. Other disinfecting products such as those described in U.S. Pat. Nos. 4,259,383 and 4,515,703 also suffer from the same disadvantage. In addition, these products do not make use of as effective a disinfecting agent as chlorine. U.S. Pat. No. 4,259,383, for example, gives an example of a surface test made using a tissue made according to its claims, wherein the killing time for certain micro-organisms is of the order of one hour. This is far too long for many practical applications of the tissue.
U.S. Pat. No. 4,532,063 describes a dissolvable bleach sheet composition which does include a chlorine release agent. However, this sheet again suffers from the disadvantage of being expensive to produce and also from the disadvantage that it is unsuitable for uses other than laundry use.
The object of the present invention is to overcome the aforementioned disadvantages and to produce a disinfecting and bleaching tissue which is inexpensive to produce and which has the advantage of using chlorine as the active agent.
According to the present invention there is provided a tissue for use in a disinfecting or bleaching operation comprising first and second substrate layers which are bonded together and between which are retained solid particles which, when dampened with a suitable liquid, become active and characterised in that the substrate layers are bonded together with an adhesive polymer which also retains the solid particles, and in that the solid particles comprise a chlorine release agent.
Preferably, one or both substrate layers comprise paper, for example wet strength tissue, high bulk tissue, dry-laid paper etc., or a nonwoven, for example dry laid coverstock, melt-blown, spun bonded, wet laid, hydroentangled powder bonded or other types of nonwoven, or a textile material, or a sponge material, or a plastics film depending on the use for which the tissue is designed. In some cases, it may be preferable for one or both substrate layers to be hydrophobic and impermeable or alternatively a high water absorption may be desirable.
Preferably also, the adhesive polymer comprises a copolyester, copolyamide or polyethylene hot melt adhesive powder, or an ethylene vinyl acetate (EVA) hot melt adhesive powder or a modified EVA hot melt adhesive powder. The particle size of these powders is in the range 0-750 microns inclusive and preferably between 50-300 microns. The hot melt adhesive powder is mixed with the solid particles comprising the chlorine release agent before its use in bonding the first and second substrates together. Typically the prepared powder composition will be applied to give coating weights of between 2 and 35 grams per square meter of low melting point polymer, along with levels of chlorine donor calculated to yield active solutions of between 10 a
REFERENCES:
patent: 3634260 (1972-01-01), Picken
patent: 4259383 (1981-03-01), Eggensperger et al.
patent: 4515703 (1985-05-01), Hag
patent: 4532063 (1985-07-01), Gueldenzopf
patent: 4728498 (1988-03-01), Theeuwes
Bell James J.
PAL International Limited
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