Patent GB-499858-A (GB)
Title: Improvements in and relating to aqueous emulsions of nitrocellulose and to processes for manufacturing the same, and to paper products treated with the same
IPC: D21H19/34
Filed: 1937-04-27
Abstract: Nitrocellulose emulsions in which water is the internal disperse phase are obtained by dispersing dry nitrocellulose in organic solvents which are substantially immiscible with water, e.g. butyl acetate, amyl acetate or cyclohexanone or mixtures thereof and then adding thereto an emulsion of water in benzene, kerosene, turpentine, white spirit, linseed oil, soya bean oil or other suitable organic liquid immiscible with water, or mixtures thereof, obtained with the aid of an emulsifying agent which normally produces water-in-oil emulsions, e.g. magnesium, calcium or barium salts of fatty acids and resins, e.g. dammar gum. Suitable resins, plasticizing agents, &c. may be added, also suitable dyes and pigments.  The products may be mixed with aqueous emulsions of nitrocellulose in which water is the external phase, the viscosity of the mixture being a value intermediate between those of the constituent emulsions, there being no apparent inversion.  The emulsions are particularly suitable for coating paper, and may be applied by spraying or rolling, the solvents then being allowed to evaporate.  According to examples: (1) 30 pts. by weight of water was dispersed in 20 pts. turpentine using 1 pt. magnesium oleate.  This emulsion was added, with stirring, to 7 pts. nitrocellulose dispersed in 42 pts. of amyl acetate; (2) 30 pts. water was dispersed in a solution of 2 pts. dewaxed gum dammar in 25 pts. of turpentine.  8 pts. soya bean oil were added, and the emulsion then added to a dispersion of 5 pts. nitrocellulose in 30 pts. cyclohexanone.ALSO:Nitrocellulose emulsions in which water is the internal disperse phase, are obtained by dispersing dry nitrocellulose in organic solvents which are substantially immiscible with water, e.g. butyl acetate, amyl acetate or cyclohexanone or mixtures thereof and then adding thereto an emulsion of water in benzene, kerosene, turpentine, white spirit, linseed oil, soya bean oil or other suitable organic liquid immiscible with water, or mixtures thereof, obtained with the aid of an emulsifying agent whch p  normally produces water-in-oil emulsions, e.g. magnesium, calcium or barium salts of fatty acids and resins, e.g. dammar gum. Suitable resins, plasticizing agents, &c., may be added, also suitable dyes and pigments.  The products may be mixed with aqueous emulsions of nitrocellulose in which water is the external phase, the viscosity of the mixture being a value intermediate between those of the constituent emulsions, there being no apparent inversion.  The emulsions are particularly suitable for coating paper, and may be applied by spraying or rolling, the solvents then being allowed to evaporate.  According to examples: (1) 30 parts by weight of water was dispersed in 20 parts turpentine using one part magnesium oleate. This emulsion was added, with stirring, to 7 parts nitrocellulose dispersed in 42 parts of amyl acetate; (2) 30 parts water was dispersed in a solution of 2 parts dewaxed gum dammar in 25 parts of turpentine. 8 parts soya bean oil were added, and the emulsion then added to a dispersion of 5 parts nitrocellulose in 30 parts cyclohexanone.