Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gesellschaft MIT Beschraenkter Haftung

Ralf Steinstrasser

Heinrich J Nikolaus

Georg Weber

Eugen Schwarz

Gernot Moschl

Werner Vikari

Gunther Feldmann-Schlohbohm

Klaus Behne

Spray dried polyol composition and method of making

The invention relates to a process for recovering nickel from industrial effluents, characterized in that

Nickel recovery process

Compounds of the general formula ##STR1## wherein n is 0, 1 or 2, R.sub.1 is straight-chain alkyl or alkoxy of 1-7 carbon atoms or straight-chain alkanoyloxy of 2-7 carbon atoms, and R.sub.2 is straight-chain alkyl or alkoxy of 1-7 carbon atoms with the proviso that when n is 0, R.sub.1 and R.sub.2 together contain at least 4 carbon atoms, which form nematic phases, can be produced by reacting a phenol of the general formula ##STR2## WHEREIN R.sub.2 has the values given above, and p is 0, 1 or 2 or a corresponding phenolate, with an aromatic carboxylic acid of the general formula ##STR3## WHEREIN R.sub.1 has the values given above, and q is 0, 1 or 2, and the sum p + q is n, or with a reactive derivative of this acid.

Nematic compounds and mixtures

Nematic mixtures on the basis of derivatives of azoxybenzene and/or the phenyl ester of benzoic acid, containing at least one compound of the general formula

Modified nematic mixtures with positive dielectric anisotropy

Compounds of the general formula ##STR1## wherein n is 0, 1 or 2, R.sub.1 is straight-chain alkyl or alkoxy of 1-7 carbon atoms or straight-chain alkanoyloxy of 2-7 carbon atoms, and R.sub.2 is straight-chain alkyl or alkoxy of 1-7 carbon atoms with the proviso that when n is 0, R.sub.1 and R.sub.2 together contain at least 4 carbon atoms, which form nematic phases, can be produced by reacting a phenol of the general formula ##STR2## wherein R.sub.2 has the values given above, and p is 0, 1 or 2 or a corresponding phenolate, with an aromatic carboxylic acid of the general formula ##STR3## wherein R.sub.1 has the values given above, and q is 0, 1 or 2, and the sum p + q is n, or with a reactive derivative of this acid.

Nematic esters of the formula ##SPC1## Wherein R.sub.1 and R.sub.2 are each alkyl, alkoxyalkyl, alkoxy or alkoxyalkoxy of 1 to 10 carbon atoms, X is CN or NO.sub.2 and Y is H or X which are useful for influencing the electrooptic properties of other nematic compositions.

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Darmstadt, Germany

Ralf Steinstrasser