PURPOSE: To provide a novel, optically transparent, isotropic molded part which is free of orientation birefringence and consists of a mixture of a polyphenylene ether, a vinylaromatic polymer and a trace of a novel diphenoquinone deriv. and/or diphenohydroquinone deriv.
CONSTITUTION: An optically transparent, isotropic molded part for optical purposes which is free of orientation birefringence and is obtained by adding at least 1,000 ppm, based on the whole mixture, of compds. of formula I and/or II (wherein R and R1 are each H, Cl, Br, alkyl, alkenyl, aryl or alkoxyl) to a mixture of a polyphenylene ether and a vinylaromatic polymer. In the additives, the compds. of formula I or II wherein R and R1 are each methyl are new. Further, new sulfuric acid half esters of hydroquinones of formula III (wherein R and R1 are each methyl; and R4 is alkyl or the like) may be added as additives.
KARORA HETSUTOMANNRAIN
RUDOGAA REEBAA
Next Patent: 4-ALKOXY-2-FLUOROPHENYLACETYLENE