Patent GB-569854-A (GB)
Title: Containers for liquids
IPC: B32B27/00
Filed: 1943-04-28
Abstract: 569,854. Oil &c. containers. SHAKESBY, L.; WATTS, J. T., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. April 28 1943, No. 6697. [Class 66] [Also in Groups VIII, XXVIII and XXIX] Containers for the storage or conveyance of oils or other non-aqueous liquids are constructed by first making tailorwise a cloth construction of the desired shape, and then impregnating and/or coating the cloth and seams by external application of a synthetic plastic or rubber-like substance in the form of an aqueous or non-aqueous dispersion ; one or more external layers of material may then be applied. The cloth construction is built up on a former or jig and the seams made by stitching and/or sticking with an adhesive resistant to the liquid. The cloth may be of cotton, rayon or synthetic fibre-forming polyamides, with or without metal threads. The impregnation &c. is effected by an aqueous dispersion of (1) a thioplast whose sulphur'is non-extractable by the contained liquid in quantity to give corrosion on Cu; (2) oil and solvent - resistant butadiene and chloroprene polymers such as neoprene and butadiene - acrylonitrile interpolymers ; (3) cellulose esters such as cellulose acetate or nitrocellulose plasticized with glyceryl adipate or sebacate &c. ; (4) polyvinyl alcohol derivatives plasticized with diacetin, glyceryl adipate or sebacate etc.; or (5) polyvinyl chloride or interpolymers of vinyl chloride such as vinyl chloride-vinylidine chloride plasticized with petrol, solvent br oil-resistant material ; alternatively, use may be made of a dispersion in plasticizer of (1) polyvinyl chloride and interpolymers thereof, or (2) polyvinyl alcohol derivatives such as formaldehyde, acetaldehyde or butyraldehyde derivatives and interpolymers thereof by repeating the above operations or by adhesively securing layers of leather, felt, heavy fabrics of cotton, rayon or nylon, or swellable sponge &c., natural or synthetic rubber &c. In one method of construction, cotton fabric is built up around a rectangular former, overlapping edges being stuck together by a heat-curing cement, and stitched ; an aqueous dispersion of thioplast, mixed with aqueous dispersions of curing and compounding agents such as zinc oxide, carbon black or mercapto-benzthiazole and, if desired, with thickening agents, is then applied, dried, pressed under heat and cured in hot air or steam. In another method, the material known under the Registered Trade Mark " Formvar " is plasticized with diacetin, dibutyl phthalate, glyceryl adipate or sebacate &c., alone or in mixtures, converted into an aqueous dispersion, and applied to the container ; thus, 300 grams of Formvar may be wetted with 50 grams of diacetin, and passed between rubber rollers at 110‹ C., a further 250 grams of diacetin being then worked in till the mixture is homogeneous ; of this plasticized Formvar, 240 grams are placed in a mixer heated to 110‹ C. and 170 grams of beta-ethoxy ethyl alcohol slowly added, the mixer being then cooled to 50‹ C. and 180 grams of water slowly added to form the dispersion into which 2 grams of sodium cetyl sulphate are stirred, the dispersion being then applied and oven-dried at 100-730‹ C. Fillers, colouring matter, &c. may also be incorporated in the initial stages. Specification 552,190, [Group V], is referred to.