Patent GB-809929-A (GB)
Title: Liquid fuel containers
Inventor: SCHOFIELD PHILIP JOHN
IPC: B64D37/02
Filed: 1955-11-16
Abstract: 809,929. Laminates; coated fabrics. IMPERIAL CHEMICAL INDUSTRIES Ltd. Nov. 5, 1956 [Nov. 16, 1955], No. 32771/ 55. Drawings to Specification. Class 140. [Also in Group XXIX] A laminated sheet material from which is made lightweight flexible containers for liquid hydrocarbon fuels comprises as the main fuel barrier a layer of fuel-resistant polyamide, to the exposed surface of which is bonded an openweave or open-knitted textile fabric, a layer of uncured rubbery material bonded to the polyamide and which is fuel resistant after curing and an outer layer of close-weave or closely knitted textile fabric bonded to the rubbery material, said textile fabrics having their yarns sealed with fuel-resistant material to prevent wicking of fuel along the fabrics. The polyamides used should be soluble in common organic solvents such as alcohol ; examples are the alkoxy methyl polyamides as described in Specification 573,482, [Group IV], especially N- methoxy - methyl - polyhexamethylene - adipamide. As the rubbery material there may be used compositions having a basis of polychloro- or copolymers of butadiene and acrylonitrile containing plasticizers or robbery polyesters or polyester amides which may be modified with diisocyanates. The textile materials may be of fibres of synthetic linear polyamides such as nylon and Perlon, aromatic polyesters such as polyethylene terephthalate, polyacrylonitrile, glass, regenerated cellulose, silk or cellulose. Leno weave fabric may be used as the open fabric. The yarns are sealed with a rubbery material, eg. of butadiene-acrylonitrile copolymer and may be first treated with an anchoring agent, e.g. diphenylmethane diisocyanate, hexamethylene diisocyanate, toluene- 9: 6 - triisocyanate or triphenylmethane- 4: 4<SP>1</SP>: 4<SP>11</SP>-triisocyanate, which may contain a little of the synthetic rubber. The nylon layer may be bonded to the rubbery layer by means of the bonding agents described in Specification 664,331, [Group IV (b)], e.g. N:N<SP>1</SP>-bis-(carbethoxyacetobutyryl)- hexamethylene diamine. (Many examples of these are given.) The various layers may be applied as coatings. In an example, a woven nylon cloth is impregnated with Mixture A comprising methyl ethyl ketone, butadiene-acrylonitrile and dibutyl phthalate and dried. To this is applied Mixture B comprising methyl ethyl ketone and a butadiene-acrylonitrile copolymer A layer of priming solution A comprising ethanol, water, methyl ethyl ketone, N: N<SP>1</SP> - bis - (carbethoxyacetoacetyl) - cyclo hexyl - diamine and N - methoxy - methylpolyhexamethylene adipamide is applied to the rubbery layer followed by the main nylon layer in Solution B comprising ethanol, water, methyl ethyl ketone and N-methoxy-methyl-polyhexamethylene adipamide. A polyethylene terephthalate leno fabric impregnated with Mixture A above is doubled to the nylon face by application of Solution A above followed by application of Solution B above. In making tanks from this material, it is cut to overlap and bonded by adhesives based on e.g. polyesters, polyesteramides, polyamides (cross linked with polyisocyanates), butadiene acrylonitrile or polychloroprene with or without phenol/formaldehyde or terpene/phenoiic-modifying products.