Colorimetric indicator compositions and method of manufacture

Details Colorimetric indicator compositions and method of manufacture Colorimetric indicator compositions and method of manufacture

1974-12-04

1976-06-15

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

23230R, 23230B, 116114AM, 252408, G01N 3122

Patent

active

039634426

ABSTRACT:
Colorimetric indicator compositions and their method of manufacture. A first reagent composition is included in the indicator compositions so that when a second reagent composition is applied to an exposed surface of the indicator compositions a reaction occurs to produce a color change. The indicator compositions include as one component a thermoplastic resin which is soluble in a liquid carrier for the second reagent composition at ambient temperatures. Particularly preferred indicator compositions incorporate a particulate coloring or contrast agent in the resin which, when the liquid carrier containing the second reagent composition is applied on an exposed surface of the indicator compositions containing the first reagent composition, dissolves the resin at the surface to provide a contrasting color background of dispersed particles in the liquid carrier. The indicator compositions are preferably prepared by coating particles of the thermoplastic resin with the first reagent composition and then thermoplastically bonding the particles together by conventional molding techniques. This method produces islands of the first reagent composition between bodies of the thermoplastic resin. Test strips utilizing the indicator compositions and their method of use.

REFERENCES:
patent: 3002385 (1961-10-01), Wahl
patent: 3006735 (1961-10-01), Jordan
patent: 3642450 (1972-02-01), Eriksson
patent: 3723064 (1973-03-01), Liotta
patent: 3784358 (1974-01-01), Drake
patent: 3798004 (1974-03-01), Zerdchid
patent: 3809616 (1974-05-01), Schmitt
patent: 3810739 (1974-05-01), Nussbaum

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