Patent GB-438965-A (GB)
Title: Process for the manufacture of condensation products
IPC: C08G75/16
Filed: 1934-05-24
Abstract: Polysulphides of an alkali or alkaline earth metal or ammonium, preferably of the tetrasulphide stage, are condensed with 2,2<1>-dichlorethylether in the presence of a diluent such as water or aqueous alcohol and a solid material which is insoluble in and finely distributed throughout the reaction medium.  Such a material is barium sulphate, especially when freshly precipitated, magnesium hydroxide and aluminium silicate. The products are obtained in the form of a suspension which can be coagulated by heating or acidifying.  Emulsifying agents such as condensation products of hydrolyzed albumen and oleic acid chloride, or sulphonic acids of alkylated naphthalenes may also be present during the reaction.  The products can be mixed with fillers and softeners, e.g. carbon black and zinc oxide, and sulphur, and vulcanized.  Mixtures with natural rubber, for example up to 25 per cent by weight, or other condensation products of polyhalogen compounds with polysulphides may be employed or articles of natural rubber can be coated with the condensation products and then subjected to a heat and pressure treatment.  The use of the products for electric insulation and for oil pipes is referred to.  According to examples: (1) Caustic soda and magnesium chloride solutions are added to a sodium polysulphide solution which is boiled with the finely distributed magnesium hydroxide precipitate and 2,2<1>-dichlorethylether added.  The condensation product is filtered and washed, added to water, acidified with hydrochloric acid and steam introduced to cause coagulation.  The product is rolled with zinc oxide and carbon black and, if desired, smoked sheets, and heated under pressure at 142 DEG C.  (2) Sodium sulphate and barium chloride solutions are added to sodium polysulphide solution to precipitate barium sulphate.  The chlorinated ether is added while refluxing, the suspension boiled for 16 hours, filtered, steam distilled and coagulated by drying on the roller.  (3) 2,2<1>-dichlorethylether is added to boiling calcium polysulphide solution containing magnesium hydroxide prepared as in (1) and the product similarly treated.  (4) Waterglass and potassium aluminium sulphate solutions are added to calcium polysulphide and the whole boiled with the ether.  (5) To a melt of sodium polysulphide, Na2S4 and Na2S5, solutions of sodium sulphate and barium chloride are added.  The chlorinated ether is added, the solution heated and finally treated with steam.  The product is mixed with cr<\>zepe caoutchouc, zinc oxide, carbon black, and mercaptobenzthiazole and pressed at 142 DEG  C.  (6) The ether is added to a sodium polysulphide solution containing barium sulphate at 108 DEG  C., the suspension removed and treated as in (2).ALSO:Condensation products of 2.21-dichlorethylether and soluble polysulphides are mixed with up to 25 per cent by weight of rubber, and preferably with fillers, softeners, vulcanization accelerators and sulphur, and vulcanized.  Shaped articles of vulcanized or unvulcanized rubber can be coated with the condensation products and then subjected to heat with or without pressure.  Examples refer to the admixture of the condensation products with smoked sheets or crepe caoutchouc, zinc oxide, carbon and mercaptobenzthiazole followed by pressing at 142 DEG  C.