Verfahren zur Herstellung von Nitrocellulose-Koernern niedriger Dichte
1,214,776. Nitrocellulose granules. DYNAMIT NOBEL A.G. 2 May, 1969 [4 May, 1968], No. 22628/69. Headings C3A and C3F. Nitrocellulose granules, generally having a bulk density of 0À4 to 0À6 g./cc., are prepared by adding a first quantity of a protective colloid and a water-soluble alkali metal or alk...
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| description | 1,214,776. Nitrocellulose granules. DYNAMIT NOBEL A.G. 2 May, 1969 [4 May, 1968], No. 22628/69. Headings C3A and C3F. Nitrocellulose granules, generally having a bulk density of 0À4 to 0À6 g./cc., are prepared by adding a first quantity of a protective colloid and a water-soluble alkali metal or alkaline earth metal salt to a nitrocellulose lacquer, which has been produced by stirring nitrocellulose at a first speed in the presence of water and a solvent for nitrocellulose immiscible with water, stirring the mixture so produced at a speed of up to 60% of the first speed until the nitrocellulose lacquer forms into globules, allowing the globules to coalesce, adding a second quantity of a protective colloid and a water-soluble alkali metal or alkaline earth metal salt, increasing the stirring speed to from 60 to 95% of the first speed, allowing the lacquer to separate into globules, distilling off the solvent and collecting the nitrocellulose granules obtained. Preferably, the nitrocellulose lacquer has been produced by stirring at a first speed of 50 to 90 r.p.m. at 50 to 90 C. The nitrocellulose lacquer may contain a stabilizer such as a phthalate, urethane, methyl and/or ethyl diphenyl urea, diphenylamine or petroleum jelly. The protective colloid may be bone glue, gelatine, gum arabic or gum shiraz and the nitrocellulose solvent may be a waterinsoluble methyl, ethyl or butyl ester of a saturated C 1-5 aliphatic carboxylic acid. The salt may be any alkali metal or alkaline earth metal sulphate, chloride or nitrate, e.g. anhydrous sodium sulphate, and may be added in the form of a saturated aqueous solution. The nitrocellulose granules may be dried at 60 to 85 C. in a current of warm air. The bulk density of the nitrocellulose granules may be further reduced by a " density-lowering process," preferably carried out by treatment of the granules with water and a solution of glycerine trinitrate and/or ethylene glycol dinitrate in ethyl acetate. |
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DYNAMIT NOBEL A.G. 2 May, 1969 [4 May, 1968], No. 22628/69. Headings C3A and C3F. Nitrocellulose granules, generally having a bulk density of 0À4 to 0À6 g./cc., are prepared by adding a first quantity of a protective colloid and a water-soluble alkali metal or alkaline earth metal salt to a nitrocellulose lacquer, which has been produced by stirring nitrocellulose at a first speed in the presence of water and a solvent for nitrocellulose immiscible with water, stirring the mixture so produced at a speed of up to 60% of the first speed until the nitrocellulose lacquer forms into globules, allowing the globules to coalesce, adding a second quantity of a protective colloid and a water-soluble alkali metal or alkaline earth metal salt, increasing the stirring speed to from 60 to 95% of the first speed, allowing the lacquer to separate into globules, distilling off the solvent and collecting the nitrocellulose granules obtained. Preferably, the nitrocellulose lacquer has been produced by stirring at a first speed of 50 to 90 r.p.m. at 50 to 90 C. The nitrocellulose lacquer may contain a stabilizer such as a phthalate, urethane, methyl and/or ethyl diphenyl urea, diphenylamine or petroleum jelly. The protective colloid may be bone glue, gelatine, gum arabic or gum shiraz and the nitrocellulose solvent may be a waterinsoluble methyl, ethyl or butyl ester of a saturated C 1-5 aliphatic carboxylic acid. The salt may be any alkali metal or alkaline earth metal sulphate, chloride or nitrate, e.g. anhydrous sodium sulphate, and may be added in the form of a saturated aqueous solution. The nitrocellulose granules may be dried at 60 to 85 C. in a current of warm air. 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Nitrocellulose granules. DYNAMIT NOBEL A.G. 2 May, 1969 [4 May, 1968], No. 22628/69. Headings C3A and C3F. Nitrocellulose granules, generally having a bulk density of 0À4 to 0À6 g./cc., are prepared by adding a first quantity of a protective colloid and a water-soluble alkali metal or alkaline earth metal salt to a nitrocellulose lacquer, which has been produced by stirring nitrocellulose at a first speed in the presence of water and a solvent for nitrocellulose immiscible with water, stirring the mixture so produced at a speed of up to 60% of the first speed until the nitrocellulose lacquer forms into globules, allowing the globules to coalesce, adding a second quantity of a protective colloid and a water-soluble alkali metal or alkaline earth metal salt, increasing the stirring speed to from 60 to 95% of the first speed, allowing the lacquer to separate into globules, distilling off the solvent and collecting the nitrocellulose granules obtained. Preferably, the nitrocellulose lacquer has been produced by stirring at a first speed of 50 to 90 r.p.m. at 50 to 90 C. The nitrocellulose lacquer may contain a stabilizer such as a phthalate, urethane, methyl and/or ethyl diphenyl urea, diphenylamine or petroleum jelly. The protective colloid may be bone glue, gelatine, gum arabic or gum shiraz and the nitrocellulose solvent may be a waterinsoluble methyl, ethyl or butyl ester of a saturated C 1-5 aliphatic carboxylic acid. The salt may be any alkali metal or alkaline earth metal sulphate, chloride or nitrate, e.g. anhydrous sodium sulphate, and may be added in the form of a saturated aqueous solution. The nitrocellulose granules may be dried at 60 to 85 C. in a current of warm air. 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Nitrocellulose granules. DYNAMIT NOBEL A.G. 2 May, 1969 [4 May, 1968], No. 22628/69. Headings C3A and C3F. Nitrocellulose granules, generally having a bulk density of 0À4 to 0À6 g./cc., are prepared by adding a first quantity of a protective colloid and a water-soluble alkali metal or alkaline earth metal salt to a nitrocellulose lacquer, which has been produced by stirring nitrocellulose at a first speed in the presence of water and a solvent for nitrocellulose immiscible with water, stirring the mixture so produced at a speed of up to 60% of the first speed until the nitrocellulose lacquer forms into globules, allowing the globules to coalesce, adding a second quantity of a protective colloid and a water-soluble alkali metal or alkaline earth metal salt, increasing the stirring speed to from 60 to 95% of the first speed, allowing the lacquer to separate into globules, distilling off the solvent and collecting the nitrocellulose granules obtained. Preferably, the nitrocellulose lacquer has been produced by stirring at a first speed of 50 to 90 r.p.m. at 50 to 90 C. The nitrocellulose lacquer may contain a stabilizer such as a phthalate, urethane, methyl and/or ethyl diphenyl urea, diphenylamine or petroleum jelly. The protective colloid may be bone glue, gelatine, gum arabic or gum shiraz and the nitrocellulose solvent may be a waterinsoluble methyl, ethyl or butyl ester of a saturated C 1-5 aliphatic carboxylic acid. The salt may be any alkali metal or alkaline earth metal sulphate, chloride or nitrate, e.g. anhydrous sodium sulphate, and may be added in the form of a saturated aqueous solution. The nitrocellulose granules may be dried at 60 to 85 C. in a current of warm air. The bulk density of the nitrocellulose granules may be further reduced by a " density-lowering process," preferably carried out by treatment of the granules with water and a solution of glycerine trinitrate and/or ethylene glycol dinitrate in ethyl acetate.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON CORRECTING FLUIDS DERIVATIVES THEREOF DYES EXPLOSIVES EXPLOSIVES OR THERMIC COMPOSITIONS FILLING PASTES INKS MANUFACTURE THEREOF MATCHES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES POLYSACCHARIDES THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF MATERIALS THEREFOR USE OF SINGLE SUBSTANCES AS EXPLOSIVES WOODSTAINS |
| title | Verfahren zur Herstellung von Nitrocellulose-Koernern niedriger Dichte |
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