Abstract: The transceiver features a fast de-excitation circuit, by means of which the transceiver can be very quickly de-energized or de-excited after sending of signals. The fast de-excitation circuit can be realized in the simplest case as a controllable switch with series-connected resistor. The transceiver is thus ready to receive signals again very fast, i.e. in the range of a few oscillation periods. With bidirectional data communication between transceiver and transponder the danger of malfunctions is avoided or at least reduced to a minimum level.

Abstract: A process for the preparation of a compound of formula (I) wherein R1 and R2 are each independently of the other C1-C8alkyl, cyclopentyl or cyclohexyl, m is 1, 2 or 3, preferably 2, n is an integer from 1 to 30, and R3 is an n-valent radical from linear or branched C4-C30alkyl, which is optionally interrupted by one or more oxygen atoms, or (when n=1-12) an n-valent radical from C5-C12cycloalkyl, or a radical R4—[NR5—CmH2m—]p, R4 is hydrogen, an n-valent radical from linear or branched C4-C30alkyl, which is optionally interrupted by one or more —NR5— groups, or (when n=1-12) an n-valent radical from C5-C12cycloalkyl, R5 radicals, each independently of any other(s), are hydrogen or methyl or —CmH2m—, preferably hydrogen, and p corresponds to the number of —[NR5—CmH2m—] groups that gives n —CmH2m— radicals per molecule, by reaction of a compound of formula (II) wherein R is C1-C3alkyl, with a compound of formula (III) R3(OH)n??(III) wherein R3 and n have the definitions given, wherein the reaction

Abstract: The transceiver features a fast de-excitation circuit, by means of which the transceiver can be very quickly de-energized or de-excited after sending of signals. The fast de-excitation circuit can be realized in the simplest case as a controllable switch with series-connected resistor. The transceiver is thus ready to receive signals again very fast, i.e. in the range of a few oscillation periods. With bidirectional data communication between transceiver and transponder the danger of malfunctions is avoided or at least reduced to a minimum level.

Abstract: A description is given of an extrusion process for the preparation of a low-dust stabiliser, using a subcooled melt as granulation liquid, as well as of novel amorphous modifications of different stabilisers, including 2,2′-methylenebis(4-[1,1,3,3-tetramethylbutyl]-6-benzotriazol-2-yl-phenol), and of the &bgr;-crystalline modification of 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole and of the preparation thereof. The novel process affords products which are easy to handle and which are flowable, and the novel modifications have advantages as regards their preparation, processing and their use as stabiliser.

Abstract: A process for the preparation of a compound of formula (I) 1

Abstract: A description is given of an extrusion process for the preparation of a low-dust stabiliser, using a subcooled melt as granulation liquid, as well as of novel amorphous modifications of different stabilisers, including 2,2′-methylenebis(4-[1,1,3,3-tetramethylbutyl]-6-benzotriazol-2-yl-phenol), and of the &bgr;-crystalline modification of 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole and of the preparation thereof. The novel process affords products which are easy to handle and which are flowable, and the novel modifications have advantages as regards their preparation, processing and their use as stabiliser.

Abstract: A description is given of an extrusion process for the preparation of a low-dust stabilizer, using a subcooled melt as granulation liquid, as well as of novel amorphous modifications of different stabilizers, including 2,2′-methylenebis(4-[1,1,3,3-tetramethylbutyl]-6-benzotriazol-2-yl-phenol), and of the &bgr;-crystalline modification of 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole and of the preparation thereof. The novel process affords products which are easy to handle and which are flowable, and the novel modifications have advantages as regards their preparation, processing and their use as stabilizer.

Abstract: There is disclosed a process for the preparation of compounds of formula I ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other C.sub.1 -C.sub.8 alkyl or cyclopentyl or cyclohexyl,m is 0, 1, 2 or 3,n is 1 or 2, andR.sub.3, depending on the value of n, is C.sub.4 -C.sub.20 alkyl, C.sub.5 -C.sub.12 cycloalkyl, C.sub.2 -C.sub.4 alkylene, or C.sub.4 -C.sub.12 alkylene which is interrupted by oxygen,by reaction of a compound of formula II ##STR2## wherein R is methyl or ethyl, with a compound of formula IIIR.sub.3 (OH).sub.n (III)which reaction is carried out in the presence of magnesium acetate as catalyst.

Abstract: There is disclosed a process for the preparation of compounds of formula I ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other C.sub.1 --C.sub.8 alkyl, m is 0, 1, 2 or 3, n is 1 or 2, and A, if n 32 1, is OR.sub.3, and R.sub.3 is C.sub.4 -C.sub.20 alkyl or C.sub.5 -C.sub.12 cycloalkyl, or A, if n=2, has the formula --O--C.sub.x H.sub.2x --O-- or --O--(CH.sub.2 CH.sub.2 O).sub.a CH.sub.2 CH.sub.2 O--, x is a number from 2 to 8 and a is a number from 1 to 12, by reacting a compound of formula II ##STR2## with a compound of formula III ##STR3## the reaction being carded out in the presence of an aluminium trialcoholate or triphenolate as catalyst.