Heat resistant herapathite and process for producing the same

Details Heat resistant herapathite and process for producing the same Heat resistant herapathite and process for producing the same

1991-11-14

1994-11-29

Tucker, Philip

Compositions

Light transmission modifying compositions

252585, 359296, 546134, F21V 900, F21V 914, G02F 100

Patent

active

053687809

ABSTRACT:
A herapathite has a capillary crystal form in which its iodine atoms are oriented in a major axis direction of the capillary crystal form. The herapathite obtained is expressed by a chemical formula, xC.sub.20 H.sub.24 N.sub.2 O.sub.2.yH.sub.2 SO.sub.4.zHI.sub.3, in which a ratio of a number of the sulfuric acid molecules (y) with respect to a number of the iodine atoms (3z), i.e., (y/3z), is less than 0.5. The production process includes a reaction step, a first separating step, a recrystallizing step and a second separating step. A solvent used in the recrystallizing step is at least one of water and alcohol. A mixing weight ratio of water with respect to alcohol of the solvent is more than 50/50 or less than 10/90. The herapathite does not degrade even after it is heated up to 130.degree. C., and it is applicable to an automobile light shielding glass which should show a high transparency when a voltage is applied thereto.

REFERENCES:
patent: 3625869 (1971-12-01), Marks
patent: 3655267 (1972-04-01), Forlini
patent: 3709828 (1973-01-01), Marks
patent: 3900417 (1975-08-01), Marks
patent: 4273422 (1981-06-01), Saxe
patent: 4407565 (1983-10-01), Saxe
patent: 4442019 (1984-04-01), Marks
patent: 5130057 (1992-07-01), Saxe
Kolloid-Zeitschrift, vol. XLV, Aug. 1928, Dresden, Germany, pp. 195-197; E. Hatschek: "Erine Heraphit-Suspension".

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