Patent GB-1012513-A (GB)
Title: Surface modified pigments
IPC: C09C1/40
Filed: 1962-09-14
Abstract: An oil-base paint or an ink contains as a pigment finely-divided sodium alumino silicate coated with an organic acid salt of rosin amine. The pigment has a Na2O : Al2O3 molar ratio greater than 0.8, a SiO2 : Na2O molar ratio greater than 4, a particle size less than 0.2m  diameter, a specific gravity of 2.10 to 2.26, and a surface area greater than 20 sq. metres per gram.  The pigment is coated with up to 5% by weight of an organic acid salt of rosin amine. Specifications 753,052, 993,944 and 1,000,531 are referred to.ALSO:Natural and synthetic rubber compositions, polyethylene, and polyvinyl chloride, contain as a filler pigment finely-divided sodium alumino silicate surface coated with an organic acid salt of a rosin amine.  The pigment has a Na2O-Al2O3 molar ratio greater than 0.8, a SiO2 : Na2O molar ratio greater than 4, a particle size less than 0.2m  diameter, a specific gravity of 2.10 to 2.26, and a surface area greater than 20 square meters per gram.  The pigment is coated with up to 5% by weight of an organic acid salt of rosin amine.  A synthetic rubber composition exemplified comprises a styrenebutadiene copolymer, para-coumarone resin, zinc oxide, stearic acid, N-cyclohexyl-2-benzothiazole sulfenamide, sulphur, diortho toluyl guanidine, and the filler pigment.  Specifications 753,052, 993,944 and 1,000,531 are referred to.ALSO:Sodium aluminosilicate pigments are coated with organic acid salts of rosin amines, the pigments having a Na2O : Al2O3 molar ratio greater than 0.8, a SiO2 : Na2O molar ratio greater than 4, a particle size less than 0.2 m diameter, a specific gravity of 2.10 to 2.26, and a surface area greater than 20 square meters per gram.  The pH of the pigment may be between 6.5 and 10.5.  The coating constitutes up to 5% by weight of the pigment.  Specified organic acids are aliphatic monocarboxylic acids containing up to 18 carbon atoms. Specified rosins are wood and gum rosins or acids contained therein, e.g. abietic and pimaric acids and may include modified rosins, e.g. polymerized, isomerized, heat-treated, hydrogenated, de-hydrogenated and disproportionated rosins or acids derived therefrom, e.g. dehydroabietic, dihydroabietic, and tetra-hydroabietic acids.  The rosin amine may be prepared by the conversion of the rosin to the corresponding nitrile, with consequent reduction of the latter to the amine, and its acid salt may be prepared by reaction of equal molar quantities of rosin amine and organic acid at temperatures sufficient to maintain the organic acid in a fluid state.  Specified salts of rosin amines are the acetate, butyrate, 2-ethyl hexanoate, palmitate and stearate of disproportionated rosin amine. In a typical example, sodium alumino silicate particles in a slurry were blended with 0.2% by weight of disproportionated rosin amine acetate, dried, and milled to a free flowing powder.  The pigment may be used in inks, oilbase paints, plastics, polymers, paper and paper-coating compositions, and rubber compounds. Properties of paper and rubber, incorporating the coated and non-coated sodium alumino silicate particles, are shown tabulated and are compared. Specifications 753,052, 993,944 and 1,000,531 are referred to.ALSO:Paper is coated with a composition containing as a pigment finely divided sodium alumino silicate coated with an organic acid salt of rosin amine.  The pigment has a Na2O:Al2O3 molar ratio greater than 0,8, a SiO2:Na2O molar ratio greater than 4, a particle size less than 0,2m  diameter, a specific gravity of 2,10-2,26, and a surface area greater than 20 sq. metres per gram.  The pigment is coated with up to 5% by weight of an organic acid salt of rosin amine.  Specifications 753,052, 993,944 and 1,000,531 are referred to.