Akzo Nobel N.v.

Akzona Incorporated

Akzo N.v.

Ulfert Elle Wiersum

Tjerk Oedse Boonstra

Richard Herman Woudenberg

Hendrik Harm Oosterwijk

Willem F Verhelst

Eduard P Magre

Joannes D Bik

Hendrik J Hageman

Johan B Reesink

Johannes Wilhelm Ladage

Johannes Hendrinus Van Dijk

Non-linear optical polycarbonates

The invention pertains to a non-linear optically active (NLO) side chain polycarbonate and to NLO active waveguides containing said polycarbonate. Waveguides containing this NLO polycarbonate have a low loss of signal. Polycarbonates based on bischloroformates of hexafluorobisphenol A, hexafluorotetrabromobisphenol A and bisphenol S or deuterated bisphenol A or sulphonylbiphenol are especially preferred within the framework of the invention: they were found to give an exceptionally low loss of signal. The invention further pertains to cross-linkable and already cross-linked polycarbonates. Especially preferred polycarbonates according to the invention are those where the diol comprises a rigid donor group. These polycarbonates have a high Tg, which renders them thermally stable.

Non-linear optically active polycarbonate

This disclosure relates to a process for the degradation of polymers in the presence of a free radical initiator. In particular this disclosure relates to a process for the degradation of polymers employing a free radical initiator selected from a class of hydroximic acid derivatives.

Process for the degradation of polymers

A thermosetting coating composition contains an acid-curable amino resin and from 0.1 to 10 percent by weight of a blocked sulphonic acid calculated on the weight of amino resin. In order to reduce the electric conductivity of the composition after a prolonged pot-life, a sulphonic acid oximate is used as the blocked acid. The compositions are advantageous for coating a substrate by electrostatic spraying.

Thermosetting coating composition containing a blocked acid catalyst

Novel brominated polydiisopropylarylene compounds which can be used for imparting fire retardance properties to polymers such as polystyrene and polypropylene contain bromine as a substituent on the aliphatic radicals and have the following formula: ##STR1## A is a thienylene group or an arylene group such as a substituted or unsubstituted phenylene, biphenylene, napthylene, or anthracylene group, R.sub.1 through R.sub.4 a methyl group substituted or not with bromine, R.sub.5 and R.sub.6 a bromine atom or a hydrogen atom, and n a whole number in the range of 2 to 10, the number of bromine atoms per molecule in the aliphatic groups being at least 2 and the total bromine content being not more than 70 per cent by weight.

Fire retardant compounds

P-Tolunitrile or m-tolunitrile is dimerized at an elevated temperature in the gaseous phase with a residence time of less than 0.1 second to form p,p'-dicyanobibenzyl or m,m'-dicyanobibenzyl.

Process for the preparation of a p,p'-dicyanobibenzyl and a

A process for effecting chemical reaction by radical initiation is provided wherein a 1,2-diaryl-1,2-cyano-1,2-dihaloethane compound is used as the initiator.

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Velp, Netherlands

Ulfert Elle Wiersum