Temperature indicating compositions and devices
OwnerThomas J. McNaughtan, deceased, by Jerry McClintock, executorinventors
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Abstract
Polymeric mixtures of a cholesterol material and a monomer are disclosed which can advantageously be utilized for the construction of temperature indicating devices. Each polymeric composition exhibits a color at temperatures below a fixed threshold temperature and then appears colorless at the threshold temperature. This characteristic permits safe, compact, accurate, fast responsive, disposable temperature indicating and warning devices to be made.
Claims6
A printable composition comprising a polymeric material dissolved in petroleum ether, said polymeric material being formed by heating a cholesteryl ester material comprising cholesteryl acetate with a thermoplastic ester of dimeric resin acid and pentaerythritol at a temperature of 150.degree. C until no further acetic acid is formed and the oily liquid changes to a solid.
A temperature indicating device comprising temperature sensitive materials applied to a substrate to form a plurality of markings thereon, each marking having a different temperature sensitivity, said temperature sensitive materials being formed by heating cholesteryl acetate with a thermoplastic ester of dimeric resin acid and pentaerythritol in the presence of varying amounts of cholesteryl propionate at a temperature of 150.degree. C until no further acetic acid is formed and the oily liquid changes to a solid.
The process of preparing a temperature sensitive device comprising a substrate, a temperature sensitive composition applied to at least one surface of the substrate and a transparent protective covering over the temperature sensitive composition, which process comprises preparing a printable composition comprising a polymeric material dissolved in petroleum ether wherein said polymeric material is formed by heating a cholesteryl ester material comprising cholesteryl acetate with a thermoplastic ester of dimeric resin acid and pentaerythritol at a temperature of 150.degree. C until no further acetic acid is formed and the oily liquid changes to a solid, applying the printable composition to the substrate and covering the temperature sensitive composition with a transparent protective coating.
Dependencies are inferred from the claim text.