| 摘要 |
<p>1,000,186. Improving laminate adhesion. NATIONAL DISTILLERS & CHEMICAL CORPORATION. June 26, 1962 [July 7, 1961], No. 24543/62. Heading B5N. Polyolefine surfaces are treated so that they can be bonded to porous substrates by sodium silicate adhesives, first physically to promote adherence, e.g. by flame or electrostatic treatment and secondly by coating with polyvinyl acetate incorporating at least one of aluminium, zinc, or magnesium chloride or bromide. The substrate may be paper, kraft paper, boxboard cloth, felt, foil or Cellophane (Trade Mark). Two layer laminates are described. The polyolefine, which may be polyethylene or polypropylene, may be extruded on one or both sides of a porous substrate, e.g. paper, before treating the exposed surfaces as above and applying further porous substrate layers to give multilayer constructions. The metal salt is preferably added to an aqueous solution of the polyvinyl acetate before application to the polyolefin surface by brush, spray, dip or knife methods.</p> |
