Method of indicating the presence of an impregnant in a substrate
First Claim
1. An article consisting of a substrate impregnated with an agent, said agent at least in part being ionically bonded to the substrate and released by contact with a polar liquid, a portion of said impregnated substrate having applied thereto a dye of a kind which will bond ionically to the impregnant more than to the substrate, whereby the disappearance of the dye from the substrate during use thereof will indicate to the user the diminution of the impregnant in the substrate.
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Accused Products
Abstract
The invention is a method of indicating the presence of an impregnant, e.g. an antimicrobial composition, in cloth to provide visual evidence of the continuing activity of the impregnant. The antimicrobial composition in the cloth is activated on contact with a liquid such as water and is ionically bonded to the cloth. Small portions of the impregnated cloth are dyed with an indicator dye which bonds preferentially to the antimicrobial composition so that when the antimicrobial composition is exhausted, the dye will disappear from the cloth. The dye is preferably applied to the cloth in stripes.
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Citations
19 Claims
- 1. An article consisting of a substrate impregnated with an agent, said agent at least in part being ionically bonded to the substrate and released by contact with a polar liquid, a portion of said impregnated substrate having applied thereto a dye of a kind which will bond ionically to the impregnant more than to the substrate, whereby the disappearance of the dye from the substrate during use thereof will indicate to the user the diminution of the impregnant in the substrate.
- 11. A substrate impregnated with a composition at least in part ionically bonded to the substrate, and released by contact with a polar liquid, a portion of said impregnated substrate having applied thereto a dye of a kind which will bond ionically to the impregnant more than to the substrate, said composition exhibiting cationic character when in aqueous solution, said composition is selected from the group consisting of quaternary ammonium compounds, bisguanides, antimicrobial amphoteric surfactants, and mixtures thereof.
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19. A wiping cloth having visual indication of antimicrobial activity comprising a non-woven fibrous viscose substrate impregnated with a mixture comprising 30 parts by weight cetyl trimethyl ammonium bromide dissolved in 100 parts by weight of a 20% aqueous solution of polymeric bisguanide, the impregnant being at least in part ionically bonded to the substrate and being activated on contact with a polar liquid, the impregnated substrate having lines of an anionic dye applied thereto such that the dye bonds ionically to the impregnant substantially more than to the substrate.
Specification