Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Noninterengaged fiber-containing paper-free web or sheet...
Patent
1985-10-15
1986-11-25
Bell, James J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Noninterengaged fiber-containing paper-free web or sheet...
427243, 4273899, 427392, 428248, 428249, 428274, 428284, 428289, 428409, 428913, B32B 2700
Patent
active
046248900
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an article suitable for wiping surfaces, for example the surface of a household or industrial object, in order to remove soil or other unwanted matter from that surface. The article includes a substrate, conveniently in the form of a flexible sheet of fibrous material, which in a preferred embodiment of the invention carries an active material, for example a detergent or disinfectant composition, that is delivered to the surface during wiping.
The invention applies especially, but not exclusively, to wiping cloths and the like which carry a relatively large quantity of a cleaning material, for example, detergent or disinfectant, in such a form that its release can be controlled over a relatively long period. Such wipes have a much greater cleaning or disinfecting capacity than do simple impregnated tissues and accordingly need a correspondingly larger capacity for taking up soil or other unwanted matter. If the capture of soil is inadequate, the useful life of the wiping article will be limited by that before the supply of cleaning material is exhausted.
Wiping articles and the like which incorporate controlled release of active material have been described, for example, in GB No. 1 522 759 (Airwick); EP 66 463A (Unilever); EP No. 68 830A (Unilever); GB No. 1 326 080 (Freudenberg); and GB No. 1 304 375 (L'Oreal). The active material (liquid or solid but usually liquid) is generally encapsulated or compartmented in some way and can be released only by the application of some stimulus, for example, squeezing, rubbing or wetting.
U.S. Pat. No. 3,954,113 (Bohrer et al/Colgate-Palmolive) describes a simple wet impregnated cloth for cleaning the hair between shampoos. The cloth is pretreated with a cationic polyelectrolyte such as polyethyleneimine, in order to render it electrically attractive to hair soil.
U.S. Pat. No. 3,694,364 (Edwards/Procter & Gamble) describes a wash adjunct in the form of a porous pouch containing detergent, the pouch being treated with a stearoylated organic polyamine, for example, stearoylated polyethyleneimine, in order to impart to it dirt-trapping characteristics.
The present invention is based on the observation that, in articles for wiping surfaces based on a substrate of fibrous material, dirt capture during wiping is substantially enhanced by the presence on the fibres of the substrate of cationic polyacrylamides. This is especially valuable in conjunction with the controlled release of cleaning material as described previously, because it gives the article a prolonged dirt-capture capability to match its prolonged active release capability.
The present invention accordingly provides an article suitable for wiping surfaces, the article comprising an absorbent flexible substrate of fibrous material carrying as a dirt-capture agent a cationic polyacrylamide. The dirt-capture agent is preferably a water-soluble copolymer comprising at least 50 mole % of acrylamide units and up to 50 mole % of units of an aminoalkyl ester of acrylic or methacrylic acid which is wholly or partially quaternised.
The absorbent flexible substrate may advantageously consist at least partially of natural cellulosic fibres, such as wood pulp or cotton linters. The term "natural cellulosic fibres" does not include regenerated cellulosic fibres such as viscose (rayon). The substrate may if desired consist wholly or predominantly of natural cellulosic fibres. Other preferred properties of the substrate are discussed below.
The preferred group of cationic polymeric materials that has been found to give substantially improved dirt-capture in accordance with the invention is thus constituted by high-molecular weight copolymers of acrylamide with unsaturated amines which are wholly or partially quaternised. In the copolymer, the acrylamide units predominate and preferably constitute 80-97 mole % of the polymer. The comonomer is an aminoalkyl ester of acrylic or methacrylic acid, in which the amino group may be substituted by one or two alkyl, alkenyl, aryl, aralkyl or other suita
REFERENCES:
patent: 2741568 (1956-04-01), Hayek
patent: 2808349 (1957-10-01), Melamed
patent: 3694364 (1972-09-01), Edwards et al.
patent: 3954113 (1976-05-01), Bohrer et al.
patent: 4391932 (1983-07-01), Tai
Lloyd John
Rennie George K.
Bell James J.
Farrell James J.
Honig Milton L.
Lever Brothers Company
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