Imperial Chemical Industries Limited

David John Watson

Brian R Fishwick

Violet Boyd

Michael S Howarth

Edward George Scovell

Donald Bramley

Gerald Thomas Davies

Ronald Lawson

Fluoromethylpyridines of the formula: ##STR1## wherein the group F.sub.n H.sub.3-n C-- may be ortho, meta or para to the ring nitrogen atom, n is 1, 2 or 3, m is 1 to 4, X is Cl, Br, I or F and, when m is 2, 3 or 4 the substituents represented by X may be the same or different, at least one X being ortho or para to the F.sub.n H.sub.3-n C-- group, are prepared by reacting a compound of the formula: ##STR2## wherein Y is Cl, Br, I or F and m is 1 to 4, with potassium fluoride in a polar aprotic solvent under substantially anhydrous conditions. These fluoromethylpyridines are useful as intermediates for herbicides. 3,4,5-trifluoro-2-trifluoromethylpyridine and 2,6-difluoro-3-difluoromethylpyridine are novel compunds.

Process for the preparation of fluoromethylpyridines

The disperse monoazo dyestuffs of the formula:- ##STR1## wherein U is hydrogen, chlorine, bromine, cyano, lower alkyl, lower alkoxy or a group of the formula --CONT.sup.1 T.sup.2, --COOT.sup.3 or --SO.sub.2 T.sup.3 ;

Disperse monoazo dyestuffs

A process and apparatus for the continuous production of heat-set, crimped, thermoplastic filaments by passing a tow of filaments through a stuffer box crimper and then a heat setting device attached to the exit of the crimper. The tow in the crimping chamber is cooled to a temperature not exceeding 100.degree. C in order to separate the heat setting and crimping processes, whereby the crimp ratio may be varied by adjusting the temperature of the tow in the crimping chamber.

Fiber process

An apparatus for setting fiber crimp by steam in which a crimped filamentary tow is discharged from the tow exit portion of a stuffer-box crimper into an elongated tube sealed to said exit portion and control means for simultaneously regulating steam pressure and the discharge of tow from the tube depending upon the pressure of steam therein.

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Manchester, United Kingdom

David John Watson