| 摘要 |
<p>1516927 Aluminium phosphate coated polymeric articles E I DU PONT DE NEMOURS & CO 25 Feb 1976 [26 Feb 1975] 7418/76 Heading B2E [Also in Division Cl] An organic polymeric article, e.g. a film of oriented polyethylene terephthalate, polypropylene, polyimide, polyvinyl fluoride or regenerated cellulose is coated with Al orthophosphate by treatment with a dispersion containing Al ions, orthophosphate ions and a further anion. This last anion concentration is reduced below 1% of the coating solids after partial curing of the coating, e.g. by treatment with adsorbent paper. Then a polymeric top coat is applied from an organic solution and the coating completely cured. A preferred top coat is a vinylidene chloride polymer containing an epoxy resin. The vinylidene chloride may be copolymerised with itaconic acid, acrylonitrile and methyl methacrylate. The base film may be pretreated by electrical discharge or flame treatment.</p> |
