Recyclable hot pad

Details Recyclable hot pad Recyclable hot pad

1979-09-13

1984-05-29

Gron, Teddy S.

Compositions

Frost-preventing, ice-thawing, thermostatic, thermophoric,...

23296, 23300, 23301, 23302R, 23302T, 126263, 2524081, 252962, 374159, 423266, 423268, 423514, 436 2, C09K 506, F24J 304

Patent

active

044513836

ABSTRACT:
A liquid melt becomes converted to crystalline form at a particular temperature either spontaneously or when artificially nucleated. The liquid releases heat at crystallization. If the liquid is in a supercooled state when it begins to crystallize, its temperature will rise from the particular temperature at which it is nucleated.
Another liquid material is mixed with the liquid to be crystallized. The liquid additive has properties of forming a metastable solid together with the crystallizing material. When the liquid additive exsolves, the crystalline aggregate is weakened and is easily decomposed into fragments of small size. The liquid additive materials may include monohydric alcohols, diols and triols. The liquid additive material may be included in the liquid to be crystallized, in small amounts, amounts to two percent (2%) to five percent (5%) being typical. The amount and relative metastability of the liquid additive material in the solution contributes to control of the size of the crystals which are ultimately produced when the supercooled fluid crystallizes. A small amount of surface active material may also be included to modify the characteristics of the metastable solid solution, the exsolution process, and the texture of the exsolved crystal aggregate.

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Svanoe, H., Chem. Eng. Progress, vol. 55, No. 5, pp. 47-54, (1959).

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