| 摘要 |
<p>1303138 Polyester fibre/elastomer laminates E I DU FONT DE NEMOURS & CO 9 April 1970 [11 April 1969] 16995/70 Heading B5N [Also in Division C3] A vulcanizable composition comprises: (A) a sulphur-curable elastomer having a hydrocarbon backbone, (B) zinc oxide, (C) sulphur, (D) a vulcanization accelerator which is: (1) a thioperoxydiphosphate of the formula (2) a zinc phosphorodithioate of the formula or (3) a basic zinc phosphorodithioate of the formula in which R, R 1 , R 2 , R 3 , R 4 and R 5 are alkyl, cycloalkyl, alkenyl, cycloalkenyl or aralkyl radicals containing 3-20 carbon atoms and (E) a fibrous polyester material. The composition which may contain 2-10 parts of zinc oxide, 0À2-3 parts of sulphur and 0À2-5 parts of accelerator per 100 parts by weight of elastomer, may also contain 0À02-3 parts per 100 parts by weight of elastomer of a vulcanisation promoter (F) which does not either during vulcanization or on aging form primary or secondary amines, e.g. 2-mercaptobenzthiazole and its zinc, ferric and cupric salts and 2, 2<SP>1</SP>-dithiodibenzothiazole. The elastomer may be natural rubber, synthetic polyisoprene, a styrene/butadiene or acrylonitrile/butadiene copolymer or a terpolymer of ethylene and propylene with 1, 4-hexadiene, 5-ethylidene-2- norbornene, 5 - methylene - 2 - norbornene or dicyclopentadiene. The fibrous material may be in the form of mono-filaments, yarns, cords or fabrics. The composition may also contain carbon black, clay, titanium dioxide, stearic acid a diphenylamine-acetone reaction product, a naphthenic process oil or a paraffinic oil. In examples polyethylene terephthalate tyre cord is dipped into a first coating composition comprising a blocked polyisocyanate and epoxy resin, dried while stretched, dipped into a second coating composition comprising a resorcinol formaldehyde resin and a butadiene/ styrene/2-vinyl pyridine terepolymer, dried without stretching, optionally coated with a third composition comprising chlorosulphonated polyethylene and resorcinol-formaldehyde resin and dried without stretching, built up into a laminate with the vulcanizable composition comprising the elastomer, zinc oxide, sulphur and vulcanization accelerator and cured.</p> |
