| 摘要 |
1,253,248. Foam-glass fabric laminates. IMPERIAL CHEMICAL INDUSTRIES Ltd. 29 Aug., 1969 [17 Sept., 1968], No. 44091/68. Heading B5N. A water vapour- and air-permeable laminate comprises an open-cell foamed thermoplastic film bonded to one or both faces of a woven glass fabric web; the air permeability is 0À0025-0À25 ml./sec. cm.<SP>2</SP> cm. head (B.S. 2925), the water vapour permeability is at least 6000 g./m.<SP>2</SP> day mil. at 38‹ C. and 98% R.H. (B.S. 3177). The foamed film may be made by extruding a pressurized mixture of molten thermoplastic material and a liquid-gas twocomponent blowing system; examples of suitable thermoplastic materials are given. Lamination may be by an impact-type polymeric adhesive and by pressing between rollers, with or without heating. The application of adhesive to an "open-mesh" web, i.e. with the fibres or filaments spaced at 0À1-1À0 inch, is followed by subjection to an air current to remove excess adhesive and maintain the required permeability; if a non-"open-mesh" web is used, adhesive is applied thereto in a pattern. A leather grain may be simulated on the product by embossing or rubbing. In an example, a woven glass filament web is adhesively bonded between two polyethylene foam films. |
