Patent GB-390532-A (GB)
Title: Improvements in or relating to the manufacture of rubber and the like materials and compounds thereof
IPC: C08J3/205
Filed: 1931-10-07
Abstract: Concentrated dispersions of mixtures of organic acids and their free salts are prepared as follows: (1) 3 parts molten stearic acid containing 1 per cent. magnesium stearate are dispersed in 1 part of water to give a paste; (2) a few drops of ammonium hydroxide are added to a small amount of water followed by a small amount of stearic or oleic acid and the mixture stirred until a completely uniform dispersion of the ammonium salt is obtained; further amounts of stearic acid are then stirred in until a pasty dispersion of the acid in the ammonium stearate is obtained; (3) 10 parts of oleic acid emulsified in 3 parts of water containing ammonium oleate as the dispersing agent yield a paste; (4) 3 parts phenyl alpha naphthylamine dissolved in 3 parts oleic acid are dispersed in 2 parts of water using ammonium hydroxide as dispersing agent; (5) 2 parts diphenylguanidine are dissolved in 6 parts molten stearic acid and dispersed in 4 parts water containing a little ammonium hydroxide give a paste. Specification 390,531, [Group V], is referred to.ALSO:Plasticizers, softeners, anti-agers, and accelerators which are easily fusible solids, adhesive semi-solids, or liquids are incorporated in rubber to form mother stocks by forming them into emulsions or into solutions in organic solvents which may themselves be other plasticizers, softeners &c. and contacting with rubber. Preferably the rubber is in thin sheet form and the contacting is effected for a period of time at a raised temperature, by stirring, pouring, spreading, or spraying.  If desired the mixture is given a subsequent milling.  Examples of materials incorporated in the above manner are cotton seed oil, certain aldehyde amine condensation products, solutions of rosin with pine oil or with oleic acid, and accelerators such as diphenylguanidine, or anti-oxidants and as the phenylnaphthylamines in oleic or stearic acid, also these and similar fatty acids used alone, in which case it is preferable to convert them into their salts, particularly the ammonium salts which decompose on drying.  Concentrated dispersions of mixtures of these salts and the free acids are prepared as follows: (1) 3 parts molten stearic acid containing 1 per cent magnesium stearate are dispersed in 1 part of water to give a paste; (2) a few drops of ammonium hydroxide are added to a small amount of water followed by a small amount of stearic or oleic acid and the mixture stirred until a completely uniform gelatinous precipitate of the ammonium salt is obtained; further amounts of stearic acid are then stirred in, until a pasty dispersion of the acid in the ammonium stearate is obtained; (3) 10 parts of oleic acid emulsified in 3 parts of water containing ammonium oleate as the dispersing agent yields a paste; (4) 3 parts phenyl-alpha naphthylamine dissolved in 3 parts oleic acid are dispersed in 2 parts of water using ammonium hydroxide as dispersing agent; (5) 2 parts diphenylguanidine are dissolved in 6 parts molten stearic acid and dispersed in 4 parts water containing a little ammonium hydroxide to give a paste.  Specification 390,531 is referred to.