Stabilized water indicating paste composition

Details Stabilized water indicating paste composition Stabilized water indicating paste composition

1986-01-03

1988-01-05

Terapane, John F.

Chemistry: analytical and immunological testing

Determination of water

73 73, 2524081, 436 40, C09K 300, G01N 3318, G01N 502

Patent

active

047176717

ABSTRACT:
A visual indicating paste composition for producing a detectable color change upon contact with an aqueous solution comprising an indicator dye capable of changing color in the pH range between about 7 and about 11, an inorganic base in the form of a caustic powder dispersed in a liquid carrier capable of absorbing water which is not rapidly leached by water or hydrocarbon, and a minor amount of a boron-containing compound, is provided. When applied to a measuring probe, the paste composition is particularly adapted for detecting the water level in the bottom of tanks and delivery systems containing gasoline, and especially gasoline containing oxygenated blending components, by producing a clear detectable color change without bleeding or run-off upon contact with an aqueous solution. The paste composition exhibits long shelf life and improved water tolerance.

REFERENCES:
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patent: 2537124 (1946-01-01), Earle et al.
patent: 3505020 (1970-04-01), Caldwell
patent: 3811837 (1974-05-01), Hoffman
patent: 3873271 (1975-03-01), Young
patent: 3898172 (1975-08-01), Reif et al.
patent: 4005132 (1977-01-01), Koster
patent: 4166891 (1979-09-01), Elliot
patent: 4255586 (1981-03-01), Harrington
patent: 4349509 (1982-09-01), Yoshikawa
patent: 4382380 (1983-05-01), Martin

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