| abstract |
A quaternary ammonium compound of formula (I): n n n n n n n n n n wherein R 0 , R 1 , R 2 and R 3 is each independently an optionally substituted hydrocarbyl group, X is a linking group, R 4 is an optionally substituted alkylene group, R 5 is hydrogen or an optionally substituted alkyl, alkenyl or aryl group, and n is 0 or a positive integer, provided that n is not 0 when R 5 is hydrogen. |