Patent GB-945675-A (GB)
Title: A new quinacridone pigment modification and pigmented systems obtained therewith
Inventor: DEUSCHEL WERNER
IPC: C09B67/52
Filed: 1960-08-22
Abstract: In an example (12) a linear quinacridone having a mean primary particle size of more than 0.1 micron and a specific surface of less than about 30 square metres per gram is ground with plaster to give a red plaster.  Cement may be similarly coloured and a red concrete made.ALSO:In examples a red pigment consisting of a linear quinacridone exhibiting in its X-ray diffraction pattern three strong lines, at a double glancing angle of 6.5 degrees, 13.7 degrees and 26.4 degrees, three medium lines at 13.1 degrees, 13.3 degrees and 23.8 degrees and three weak lines at 17.0 degrees, 20.5 degrees and 25.0 degrees and having a mean primary particle size of more than 0.1 micron and a specific surface of less than about 30 square metres per gram is incorporated into (2) nitrocellulose, dibutyl phthalate, ethyl alcohol and ethyl glycol; (3) linseed oil, xylene and the esterification product of phthalic acid and a mixture of glycerin and pentaerythritol; (4) nitrocellulose, dibutyl phthalate, benzyl butyl phthalate, the product obtained by treating cyclohexanone with sodium hydroxide, butyl acetate, methyl acetate and toluene; (5) coconut oil alkyd resin, xylene and n-butanol; (6) a drying unsaturated polyester resin, and monostyrene and a cyclohexanone peroxide paste and then cobalt naphthenate in white spirit and silicone oil solution are added; (7) polyvinyl chloride, di-isooctyl phthalate and titanium dioxide (rutile); (8) polystyrene, polyethylene or polycaprolactam; (9) a mixture of pale crepe rubber, sulphur, stearic acid, 2-mercaptobenzthiazole, hexamethylene tetramine, zinc oxide, chalk and titanium dioxide (anatase) and vulcanisation is effected; (10) titanium dioxide (rutile), lithopone, talc and a solution of sodium hexametaphosphate and a condensation product from sodium naphthalene-2-sulphonate and formaldehyde, and the paste thus obtained is mixed into a polyvinyl acetate dispersion or into a commercial self-vulcanising rubber latex.ALSO:The invention comprises a modification of linear quinacridone (7 : 14-dioxo-5 :7 : 12 : 14-tetrahydroquinolino -(2 : 3-6) - acridine) which exhibits in the X-ray diffraction pattern three strong lines at a double glancing angle of 6.5 degrees, 13.7 degrees and 26.4 degrees, three medium lines at 13.1 degrees, 13.3 degrees and 38.8 degrees and three weak lines at 17.0 degrees, 20.5 degrees and 25.0 degrees, in a mean primary particle size of more than 0.1 micron and with a specific surface of less than about 30 square metres per gram.  The modification is made by contacting 7 : 14-dioxo- 5 : 7 : 12 : 14 - tetrahydroquinolino - (2: 3-6)-acridine in a mean primary particle size of less than 5 microns length with N-methylpyrrolidone until the above X-ray diffraction pattern has been obtained.  The pigment, prepared by grinding or acid-pasting, may be stirred or boiled with the N-methylpyrrolidone, or ground with a water-soluble inorganic salt, an alkali and the N-methylpyrrolidone.  Examples are given. In further examples, (1) a printing ink is made by grinding the above linear quinacridone with aluminium hydroxide and a linseed oil varnish; and (II) a wallpaper colour is made by suspending heavy spar in aqueous aluminium sulphate, adding sodium carbonate and an aqueous paste of the above linear quinacridone and then aqueous barium chloride and mixing the resulting precipitate with an aqueous glue solution.  Specifications 808,052 and 868,360 are referred to.ALSO:In an Example (13) on red dyed paper is made by mixing an aqueous paste of a linear quinacridone exhibiting in its X-ray diffraction pattern three strong lines at a double glancing angle of 6.5 degrees, 13.7 degrees and 26.4 degrees, three medium lines at 13.1 degrees, 13.3 degrees and 23.8 degrees and three weak lines at 17.0 degrees, 20.5 degrees and 25.0 degrees and having a mean primary particle size of more than 0.1 micron and a specific surface of less than about 30 square metres per gram with bleached sulphite cellulose, grinding the mixture with wood glue and aluminium oxysulphate and working up in a paper machine.