Patent GB-1093081-A (GB)
Title: Method of dispersing fine particles in an nonaqueous solvent
IPC: C09K23/00
Filed: 1965-01-29
Abstract: A dispersing agent is prepared by copolymerizing equi-molecular proportions of maleic anhydride and isobutylene in benzene solution using benzoyl peroxide as catalyst, to produce a copolymer of molecular weight 3000, and reacting the copolymer so formed with ammonia or with alkylamines such as ethyl, butyl, octyl, stearyl and lauryl amines. Other amines including polyamines are also specified. A paint based on a vinyl chloride/vinyl acetate copolymer comprises also benzene, acetone, ethyl acetate, titanium dioxide and a diisobutylene-maleic acid copolymer octyl half amide.  Two paints based on a soybean oil denatured alkyd resin comprise also (1) titanium dioxode, ferric oxide, carbon black, xylene and an isobutylene/maleic acid copolymer stearyl half amide, and (2) titanium dioxide, ferric oxide, toluene and an a -octadecene/maleic acid copolymer half amide.ALSO:Fine particles, e.g. pigments, are dispersed in a non-aqueous solvent in the presence of a dispersing agent of general formula <FORM:1093081/C1/1> wherein R1 is H or a normal -CnH2n+1 group R2 is H, a normal or iso -CnH2n+1 group, a normal or iso -CnH2n-1 group, a -C6H5 group, a -CH2.C6H5 group or a -O-CnH2n+1 group, R3 is H, a normal or iso -CnH2n+1 group or a normal or iso -CnH2n-1 group, n being a whole number and M is H, ammonium or a metal giving a metallic salt soluble in an organic solvent, a solvent-soluble organic amine or a fatty alkyl quaternary ammonium salt and m is a whole number greater than 1.  The dispersing agents exemplified are the half-amide and the ethyl, butyl, octyl, lauryl and stearyl half amides of a diisobutylene/maleic acid copolymer having a molecular weight of 3000, and an a -octadecene/maleic acid copolymer half-amide. Pigments exemplified are carbon black, zinc oxide, titanium dioxide, ferric oxide and phthalocyanine blue. Solvents exemplified are toluene, ethyl acetate, methanol and xylene. Synthetic resin-containing paints, formulated according to the invention, are also described (see Division C3).ALSO:Fine particles, e.g. pigments, are dispersed in a non-aqueous solvent in the presence of a dispersing agent of general formula <FORM:1093081/B1-B2/1> wherein R1 is H or a normal -CnH2n+1 group, R2 is H, a normal or iso -CnH2n+1 -C6H5 group, a -CH2.C6H5 group or a -O-CnH2n+1 group, R3 is H, a normal or iso -CnH2n+1 group or a normal or iso -CnH2n+1 group, n being a whole number and M is H, ammonium or a metal giving a metallic salt soluble in an organic solvent, a solvent-soluble organic amine or a fatty alkyl quaternary ammonium salt and m is a whole number greater than 1.  The dispersing agents exemplified are the half-amide and the ethyl, butyl, octyl, lauryl and stearyl half amides of a diisobutylene/maleic acid copolymer having a molecular weight of 3,000, and an a -octadecene/maleic acid copolymer half-amide. Pigments exemplified are carbon black, zinc oxide, titanium dioxide, ferric oxide and phthalocyanine blue.  Solvents exemplified are toluene, ethyl acetate, methanol and xylene. Synthetic resin-containing paints, formulated according to the invention, are also described (see Division C3).