DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION Preferred phosphorus compounds for use in the invention are (a) compounds of Formula I, II or III above wherein each of the R groups, which may be the same or different, is (i) a hydrogen atom; (ii) an aryl group; (iii) a substituted aryl group; (iv) a group which is such that the compound is capable of homopolymerisation or copolymerisation, which contains carbon and hydrogen and in which any other atoms are one or more of fluorine, chlorine, oxygen, sulphur, nitrogen, phosphorus and silicon; (v) an alkyl group; or (vi) an alkyl group substituted by one or more groups each of which consists of one or more atoms selected from carbon, hydrogen, fluorine, chlorine, oxygen, sulphur, nitrogen, phosphorus and silicon; subject to the provisos that, unless at least one of the Q groups is a group which renders said compound capable of polymerisation (i.
e.
homopolymerisation or copolymerisation), (1) when n is 1, and each of the Q groups is an --XR group, and two or more of the Q groups are O-alkyl or O-aralkyl groups, the molecular weight of the compound is at least 382; (2) when n is O and each of the Q groups is an X-alkyl group, at least one of the X's is oxygen and the molecular weight of the compound is at least 442; and (3) no phosphorus atom is directly bonded to more than two hydrogen atoms; (b) a salt of a said compound (a) containing a salt-forming acidic group, the cation in said salt being an ammonium or quaternary ammonium ion or a metal ion wherein the metal is a metal having an atomic number less than 56 and belonging to Group IA, IIA, IIB, IIIA, IIIB, IVA, IVB, VA, VB, VIA, VIIB and VIII; or (c) a complex of a said compound wherein n is O and a metal salt wherein the metal is a transition metal other than copper.
The phosphorus-containing compound can be mixed with the polymer or with a precursor of the polymer in any way which ensures satisfactory dispersion thereof.
For example, the anti-tracking additive can be mixed with the polymer before or after the phosphorus compound, or the phosphorus compound and the anti-tracking additive can be premixed and added together to the polymer
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Adhesives and Rubbers 
