| 摘要 |
<p>1325850 Printing with plastics material INMONT CORP 9 June 1970 [16 June 1969] 7824/73 Divided out of 1324541 Heading B6C [Also in Division B2] A flexible water-vapour permeable sheet material having a microporous surface of elastomeric polyurethane and carrying on the surface a discontinuous pattern or open pattern of plastic polymer containing pigment in low relief, the pattern being such that no point in the pattern is further than 2 mils. from the boundary of a relief deposit of plastic polymer, the height of the relief pattern being not more than 1 mil. may be prepared by contacting the surface locally with a discontinuous pattern or open pattern of a solution of an elastomer polymer and a pigment in a solvent for the polyurethane of the surface, the solution containing at least 1% by weight of polyurethane, in such a way that there is deposited on the surface a discontinuous or an open pattern of plastic polymer in low relief, and drying to remove the solvent by evaporation. The plastic polymer in low relief preferably is also a polyurethane elastomer and is deposited as a viscous pigmentcontaining solution thereof, by mezzo printing. It is preferred to deposit a higher relief visible pattern of plastic polymer over the discontinuous pattern or open pattern to produce a surface having higher relief polymer masses with the low relief pattern between the masses. This higher relief pattern is suitably deposited as a viscous pigment-containing solution thereof, by intaglio printing. After depositing the relief pattern the microporous sheet material may be heat-treated to cause a shrinkage of at least 5% in area. Fig. 1 (not shown ) is an enlarged photomicrograph looking down at the upper surface of a microporous sheet showing a relief pattern, the surface carrying spaced masses 32 of elastomeric polyurethane and an open pattern of thin irregular-shaped lines, or low ridges, 33 of thermoplastic polyurethane, in the spaces between masses 32. The sheet material is useful for making shoe uppers.</p> |
