Pymah Corporation

Dennis Nickoloff

Craig R Hof

Roy A Ulin

A new and useful composition of matter, solid at room temperature, is disclosed, comprising: (1) an effective amount of a suitable nucleating agent substantially uniformly dispersed in (2) a suitable pressure-sensitive adhesive for encapsulating a temperature-sensitive solid mixture having a given nucleation efficiency and which melts at a predetermined temperature, whereby the suitable nucleating agent is (a) inert to both the pressure-sensitive adhesive and the temperature-sensitive solid mixture, and (b) capable of raising the nucleation efficiency of said solid mixture. The novel composition of matter overcomes the extreme super-cooling achieved by temperature-indicating compositions of matter in U.S. Pat. No. 4,232,552 (which change color with a change in phase) without the use of classical nucleating agents being employed in such temperature-indicating compositions of matter. The novel adhesive composition of matter has been found to be especially suitable in conjunction with a preferred '552 temperature-indicating composition of matter comprising pinacyanol iodide dissolved in a solvent comprising ortho-chloronitrobenzene and ortho-bromonitrobenzene. An especially suitable novel adhesive of the instant invention comprises 0.5 to about 5.0 phr talc in polyisobutylene.

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Lake Hiawatha, NJ, United States of America

Dennis Nickoloff