HIGH TEMPERATURE RESISTANT TRANSPARENT PLASTICS.
Quarterly progress rept. no. 1, 15 Feb-14 May 61,
MIDWEST RESEARCH INST KANSAS CITY MO
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Purification of the diglycidyl ether of bisphenol A by vacuum distillation and decolorization of the trimethoxyboroxine catalyst produced colorless starting materials. After curing in vacuum at 375 F for 4 hr, the 0.25 in. thick castings had a luminous transmission of 88. In addition to an improvement of the color of the cured castings, an increase in thermal resistance was obtained. Determination of the physical properties of the vinylcyclohexene dioxide-hexahydrophthalic anhydride resins was initiated. Small quantities of low color epoxy novolac resin were obtained by molecular distillation of a commercial product. Pound quantities of the bisbicyclic diepoxides were synthesized for investigation of curing reactions and measurement of thermal properties. Author