Acid indicators
AssigneeAWC. Inc.
InventorClaude L. Warner
Life of this patent
Estimating the term…
Abstract
Safety apparel for use in harardous environments has an indicating material incorporated in the surface of the apparel. On exposure to hazardous materials, such as acids and bases, the surface changes color to indicate exposure and provide a warning. Further, a material and method is provided to treat surfaces to indicate exposure to hazardous materials. The treated surfaces may exhibit reversibility effective to indicate exposure over repetitive cycles.
Claims23
A hazardous acid-base detecting material, the material comprising a coating composition which can be applied as a film section to worker's protective gear subject to exposure to hazardous acid-base atmospheres, the coating composition containing a vehicle and a dye effective to undergo, when the film section on the protective gear is dried, a color change on being contacted by the hazardous acid-base atmosphere, the dye being a tautomer whose tautomeric forms are effective to an acid-base atmosphere containing less than 0.15 percent moisture, and the vehicle being selected from the group consisting of vinyl, latex, acrylic, acetate, phenolic, epoxy, polyethylene, and polypropylene polymers and copolymers.
A hazardous acid-base detecting material, the material comprising a coating composition which can be applied as a film section to surfaces subject to exposure to hazardous acid-base atmospheres, the coating composition containing a vehicle and a dye effective to undergo a color change, when the film section on the surfaces is dried, on being contacted by a hazardous acid-base atmosphere, the dye being a tautomer whose tautomeric forms are effective to change color, in use, in response to acid-base vapors containing less than 0.15 percent moisture, the dye being selected from the group consisting of Victoria Blue dyes, metanil yellow, alizarin dyes and Pylachrome yellow, and the vehicle being selected from the group consisting of vinyl, latex, acrylic, acetate, phenolic, epoxy, polyethylene, and polypropylene polymers and copolymers.
The method of testing for the presence of hazardous acids and bases comprising applying to a surface to be tested a hazardous acid or base detecting material in the form of a coating composition, the coating composition being applied as a film to the surface, subjecting the surface to exposure to a hazardous acid or base containing environment, the coating composition containing a dye effective to undergo a color change, in use, when the film section is dried, on being contacted by the hazardous acid or base containing environment, the dye being a tautomer whose tautomeric forms are effective to change color in response to an acid or base containing gas or vapor having less than 0.15% moisture content, the dye being selected from the group consisting of Victoria Blue dyes, metanil yellow, alizarin dyes and Pylachrome yellow, the vehicle being selected from the group consisting of vinyl, latex, acrylic, acetate, phenolic, epoxy, polyethylene, and polypropylene polymers and copolymers.
Dependencies are inferred from the claim text.