Moisture indicators for the absorbent capacity of a desiccant
AssigneeLevosil S.p.A.
InventorMarco Gattiglia
Life of this patent
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Abstract
Moisture indicators comprising, as active principle, copper chloride or another salt capable of releasing Cu++ and Cl− ions, and synergistic salts containing chloride ions, which may be hygroscopic on a suitable support. Depending on the application, the support may be amorphous silica or silica gel; a solid paper support for making a moisture-indicating label; or a bentonite or calcium sulphate for making pellets by mechanical pressing.
Claims11
Moisture indicator comprising a support coloured with copper chloride or one or more salts capable of releasing Cu++ ions and Cl− ions, and one or more metal chlorides or synergistic hygroscopic salt.
Moisture indicator comprising a support coloured with copper chloride or one or more salts capable of releasing Cu++ ions and Cl− ions, and one or more metal chlorides or synergistic hygroscopic salt,
- wherein said support consists of bentonites of fine particle size or calcium sulphate, molecular sieves, fossil flour, diatomaceous earth or alumina.
Moisture indicator comprising a support coloured with copper chloride or one or more salts capable of releasing Cu++ ions and Cl− ions, and one or more metal chlorides or synergistic hygroscopic salt,
- wherein said hygroscopic salts are in amounts not greater than 30 times the amount of copper chloride.
A moisture indicator comprising:
- at least one salt capable of releasing Cu++ ions and Cl− ions and being between 0.1% and 1.5% by weight of the moisture indicator;
- at least one of a metal chloride and a synergistic hygroscopic salt;
- and
- a support, said at least one salt and said synergistic salt coloring said support.
Dependencies are inferred from the claim text.