| 摘要 |
Complexed oxidized polyethylene may be prepared by heating above the melting point of the polymer compositions comprising oxidized polyethylene containing 0.20 to 7.5 weight per cent of combined oxygen and a salt or complex of a metal of valency at least 2, the weight ratio of oxidized polyethylene to metal compound being 1:0.01 to 1:2. Specified metal salts are aluminium mono-, di- and tri-stearates, aluminium octoate, aluminium hydroxystearate, aluminium palmitate, tin oleate, tin octoate, tin chloride and chromium chloride. Specified complexes are complexes of acetyl acetone with beryllium, zinc, aluminium, iron, magnesium, calcium, zirconium, chromium, titanium or nickel. The oxidized polyethylene complexes may be added to hydrocarbon oils to form lubricating greases, used for water-proofing textiles, added to polyolefin/foaming agent compositions in the production of foamed polyolefins, added to polyolefins to produce dyeable compositions and oriented films, and added to gasoline to produce elastic gels. In examples complexes are prepared from oxidized polyethylenes and (2 and 3) aluminium monostearate, (4) aluminium distearate, (5 and 6) aluminium tristearate, (7) aluminium hydroxystearate, (8) aluminium palmitate, (9) aluminium octoate, (10) stannous oleate, (11) stannous chloride, and (13-16 and 34-37) chromic chloride; and in Examples 26 and 27 foams are prepared from compositions comprising polyethylene, a blowing agent and complexes prepared from oxidized polyethylene and aluminium tristearate.ALSO:Greases or other lubricants may be prepared by adding to a hydrocarbon oil 1 to 30 per cent by weight thereof of an additive consisting of a complex of oxidized polyethylene containing 0.20 to 7.5 weight per cent combined oxygen, with a salt or complex of a metal of valency at least 2, the weight ratio of oxidized polyethylene to metal compound being 1:0.1 to 1:2, or the precursors of such a complex, heating the mixture for such a time and at such a temperature that the complex dissolves in the oil and cooling the grease or other lubricant so formed. The oil may be a mineral oil or decalin. Specified metal compounds are salts and acetylacetonates of aluminium, tin, chromium, beryllium, zinc, iron, magnesium, calcium, zirconium, titanium or nickel. In examples lubricating greases are formed from (18) oxidized polyethylene, mineral oil and aluminium stearate, (22) oxidized polyethylene mineral oil and aluminium mono-, di- and tristearates, aluminium octoate and nickel acetylacetonate, and (24) oxidized polyethylene, decalin and aluminium tristearate. Inflammable elastic gels may be prepared by adding to gasoline 1 to 30 weight per cent of the above defined complexes or precursors thereof. In example (31) gasoline, oxidized polyethylene, aluminium naphthenate and aluminium palmitate are heated under pressure and the product cooled to form an inflammable elastic gel. missing page 280ALSO:Textile fibres are water-proofed by applying thereto at 20 to 140 DEG C. 2 to 15 weight per cent of a gel formed from a complex of oxidised polyethylene containing 0.20 to 7.5 weight per cent of combined oxygen and a salt or complex of a metal of valency at least 2 in a weight ratio of 1:0.01 to 1:2, or precursors of such a gel, and a solvent for said oxidised polyethylene at a temperature sufficient to dissolve it, said gel or precursors being present in amount 1 to 30 per cent by weight of the solvent. The fibres may be of wool, cotton, rayon, nylon, polyester or acrylic resin. In example (25) nylon swatches are proofed by treating with a composition prepared by heating xylene, oxidised polyethylene and aluminium tristearate, applied by means of a roller to give an addition of gel of 5 per cent. |
