Patent GB-430773-A (GB)
Title: Production of oil and solvent resistant material
IPC: C08L7/00
Filed: 1934-07-13
Abstract: For the production of plastic materials resistant to oils and solvents which may be incorporated in rubber or the like to impart such properties, an olefine or diolefine or halogen substitution product thereof is reacted with a halide of an element of the sulphur group (excluding oxygen) and the resulting compound of four elements is treated to replace all or a part of the halogen by sulphur and/or selenium by reacting with, for example, a sulphide, polysulphide, selenide, polyselenide, sulphoselenide, thiosulphate or selenosulphate of a positive atom or group such as an alkali, alkaline earth or ammonium.  This replacement may be effected in one stage as with a polysulphide, or when additional elements such as sodium and oxygen are present the intermediate product containing, for instance, the groups R.SNa or R.S2O3Na (R being hydrocarbon radicle) is further treated by oxidation as with hydrogen peroxide, reduction (chemical or electrolytic) or with halogen or alkali so as to produce finally compounds of the type R.S--S.R.  In examples: (1) ethylene is passed through sulphur chloride under reflux at 50--60 DEG  C., crystals of sulphur separating, and the product is refluxed with aqueous sodium pentasulphide; the plastic mass which separates is incorporated in a rubber mix containing sulphur, zinc oxide, mercaptobenzthiazole, stearic acid and gas black and vulcanized; (2) the first reaction is effected at 100 DEG  C., using a little of the previous product as catalyst, and the second reaction is effected as before, yielding a harder product which is incorporated in the same rubber mix; (3) equal volumes of isoprene and disulphur dichloride in dry benzol are stirred together, and the stiff jelly produced is broken up and allowed to stand, and is then swelled in benzol and aqueous sodium polysulphide is added, the mixture being boiled under reflux, when a rubbery mass separates which is washed, dried and rolled into sheets and then treated with benzol to remove a small proportion of soluble matter; the product is incorporated into rubber by milling in the usual manner.ALSO:For the production of plastic materials resistant to oils and solvents which may be incorporated in rubber or the like to impart such properties, an olefine or diolefine or halogen substitution product thereof is reacted with a halide of an element of the sulphur group (excluding oxygen) and the resulting compound of four elements is treated to replace all or a part of the halogen by sulphur and/or selenium by reacting with for example a sulphide, polysulphide, selenide, polyselenide, sulphoselenide, thiosulphate or selenosulphate of a positive atom or group such as an alkali, alkaline earth or ammonium.  This replacement may be effected in one stage as with a polysulphide, or where additional elements such as sodium and oxygen are present the intermediate product containing for instance the groups R.SNa or R.S2O3Na (R being a hydrocarbon radicle) is further treated by oxidation as with hydrogen peroxide, reduction (chemical or electrolytic) or with halogen or alkali so as to produce finally compounds of the type R.S-S.R.  In examples: (1) ethylene is passed through sulphur chloride under reflux at 50-60 DEG  C., crystals of sulphur separating, and the product is refluxed with aqueous sodium pentasulphide; the plastic mass which separates is incorporated in a rubber mix containing sulphur, zinc oxide, mercaptobenzthiazole, stearic acid and gas black and vulcanized; (2) the first reaction is effected at 100 DEG  C., using a little of the previous product as catalyst, and the second reaction is effected as before, yielding a harder product which is incorporated in the same rubber mix; (3) equal volumes of isoprene and disulphur dichloride in dry benzol are stirred together, and the stiff jelly produced is broken up and allowed to stand, and is then swelled in benzol and aqueous sodium polysulphide is added, the mixture being boiled under reflux, when a rubbery mass separates which is washed, dried and rolled into sheets and then treated with benzol to remove a small proportion of soluble matter; the product is incorporated into rubber by milling in the usual manner.