| 摘要 |
1281574 Polyolefin containers DOW CHEMICAL CO 27 Oct 1969 [25 Oct 1968] 52561/69 Heading C3P Containers substantially' impermeable to solvents, fuels, vapours and gases and comprising solid, non-aromatic hydrocarbon polymers having a linear hydrocarbon structure, at least one surface of the container having hydrogen atoms replaced by sulphonic acid salt groups so that it contains 0À01 to 50À0, or in the case of polyethylene 0À03 to 50, milligram SO 3 equivalents per square centimetre, may be prepared by treating the surface of a hydrocarbon polymer container with sulphur trioxide and converting the sulphonic acid groups produced into salt groups. Specified polymers are of ethylene, propylene, isobutylene, butene-1, methylpentene-1, vinyl chloride and vinylidene chloride, and chlorinated polyethylene and poylpropylene. The surface may be treated with sulphur trioxide vapour, optionally diluted with inert gas such as air, and any resulting colour removed by bleaching with sodium hypochloride or hydrogen peroxide. Alternatively the sulphur trioxide may be in solution in metnylene chloride, carbon tetrachloride, tetrachloroethylene, tetrachloroethane or ethylene dichloride, as oleum or complexed with pyridine, dioxane or thioxane. Neutralization may be effected with alkali and alkaline earth metal hydroxides or salts of weak acids, heavy metal chlorides or sulphates, amines or ammonia. Many suitable reactants and materials are specified and examples describe the sulphonation of (1-5) polyethylene bottle and (6 and 7) polypropylene tanks. The process may also be applied to films, hoses and plastics face pieces for gas masks.
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