| 摘要 |
1,247,526. Laminates. MORTON INTERNATIONAL Inc. 27 Nov., 1968 [29 Nov., 1967], No. 56301/68. Heading B5N. [Also in Division B2] A substrate is coated with a coating composition comprising a polyolefine by applying to the substrate on the surface to be coated a primer comprising a hydrolysed copolymer derived from one or more olefine monomers and one or more vinyl alcohol ester monomers and applying the coating composition to the primed surface by extruding a hot melt thereof which is maintained at a temperature below that at which the polyolefine becomes susceptible to oxidation or degradation. The olefine monomers may be C 2 -C 6 olefines, e.g. ethylene, propylene, butylene, isobutylene and 1-hexene. The ester monomer may be vinyl acetate. The hydrolysed copolymer may be reacted with an organic isocyanate. The substrate may be a flexible packaging material, e.g. Kraft paper, paperboard, glassine, aluminium foil, polypropylene film, regenerated cellulose, polyamide film, polyester, e.g. polyethylene terephthalate, cellulose acetate, polyvinyl chloride and polyvinylidene chloride. The substrate may be primed by spraying, slushing, immersing, roller coating. The polyolefine may be polyethylene, polypropylene, polybutene, copolymers of ethylene or propylene with each other or with vinyl acetate, acrylic acid, methacrylic acid, methylacrylate, ethylacrylate, isobutylacrylate, vinyl chloride, methyl methacrylate, tetrafluoroethylene, butene-1, or ionomer olefine copolymer resins such as ethylene-acrylic acid copolymers, or ethylene-ethylacrylate-acrylic acid terpolymers. In Fig. 1 the substrate material is fed from a substrate roll to the primer application station and the prime-coated substrate is then passed through a drying zone and thence over a combining roll where a curtain of extruded polyolefin resin falls on to the primed substrate. The coating material and substrate are then passed through the nip form by the combining roll and a chill roll whereby a polyolefinecoated substrate is formed. |
