| abstract |
PCT No. PCT/GB94/02786 Sec. 371 Date Feb. 5, 1996 Sec. 102(e) Date Feb. 5, 1996 PCT Filed Dec. 20, 1994A method of preparing a non-aqueous dispersion of CuPc which comprises milling crude CuPc in a high boiling liquid at a temperature from 50 DEG to 150 DEG C. in the presence of a polyester amine or polyesterammonium salt and a CuPc fluidising agent. Preferred polyesterammonium salt is obtainable by reacting polyhydroxystearic acid with 3-dimethylaminopropylamine quaternised with dimethylsulphate. |