| 摘要 |
1,175,554. Laminates; seaming non-metallic sheet material. ARMOUR & CO. 17 Jan., 1967 [19 Jan., 1966], No. 2427/67. Headings B5K and B5N. A sheet of an inert polyfluorocarbon or polyester plastic is bonded to itself or another dissimilar substrate material by applying a primer which comprises a polyamide resin and an epoxy resin in a solvent to the inert plastic sheet, dried, coated with adhesive which is not the same as the primer composition, and then contacted with the substrate material. The primer composition may comprise the polyamide resin and the epoxy resin in a ratio of 3-1 to 1-1 by weight and the primer solution may contain 10-40% solids. The primer composition may comprise 15 to 45 parts by weight polyamide resin, 8 to 24 parts by weight epoxy resin and 77 to 31 parts by weight of an organic solvent. The adhesive may comprise (1) a thermoplastic copolymer of vinyl acetate and ethylene, vinyl acrylate and ethylene, or vinyl acetate and propylene, (2) an ester formed by the reaction of pentaerythritol or glycerol with a resin, terpene, polyterpene or dimerized resin acid, and (3) a wax. The substrate may take the form of a film, sheet, fabric, web or structure; and may be of polychlorotrifluoroethylene or polytetrafluoroethylene. The primer may be applied by roll applicator, brush, flow-on, dipping or spraying. The coated sheets may be placed in abutting relationship, three edges being pressed and sealed to form an open-ended pouch. |
