| 摘要 |
1341208 Surface treatment of polymers MACDERMID Inc 29 Dec 1970 [31 Dec 1969] 61425/70 Headings C3B C3P and C3R [Also in Divisions B2 B5 C7 and H1] The surface of a thermoplastic resin sheet or a partially cured thermosetting resin sheet is sensitized to receive adherent coatings by anodically treating the surface of an aluminium or aluminium alloy foil, contacting the treated surface with the plastics sheet, applying heat and pressure sufficient to bond them, and in the case of a thermosetting resin to cure the resin, and chemically stripping the aluminium foil from the plastics sheet. The plastics sheet may particularly comprise polypropylene, ABS copolymer, a B-stage epoxy resin obtained from epichlorohydrin and bisphenol A or a B-stage phenolic resin and also may be of polysulphone, polycarbonate, polyphenylene oxide or a thermosetting polyester. It may be reinforced with nylon fibre, asbestos, mica, paper or especially glass fibre in the form of filaments or staple yarns, rovings, mats, woven fabrics or chopped fibres. The foil may comprise pure Al or Al-Cu, Al-Mg or Al-Cu-Mg-Zn alloy and is anodically treated in an electrolytic bath containing 10-60 weight per cent of phosphoric acid at 70-130‹F. for 1-30 minutes at a current density of 10-75 amps per square foot. The foil is stripped from the resin sheet by treatment for 2-30 minutes at 80-180‹ F. with an aqueous solution of NaOH, KOH, LiOH or HCl. Prior to coating, the sensitized surface of the resin sheet may be catalysed in a tin-palladium catalyst solution. In Examples IV and VI, the thus-prepared surface of a polypropylene and ABS copolymer sheet respectively is plated electrolessly with nickel and then electrolytically with copper using conventional techniques. In Examples V and VI, similar sheets are coated with an acrylic base lacquer. |
