| 摘要 |
<p>Supple, microporous, breathable elastomeric films with a system of intercommunicating cells are described. The films which optionally contain inert organic or inorganic particles varying in size from about 0.02 microns to 150 microns are prepared by deposition from a solution spread on a suitable surface. Deposition is effected by exposure of the solution to a liquid which is miscible with the solvent but which does not dissolve the elastomer. The use of the film in the preparation of leather replacement compositions by integration as a grain layer in and on the surface of suitable substrates is described. For this use the selected substrate is wet with a liquid in which the elastomer is insoluble, coated with a solution of the elastomer in a solvent which is miscible with the liquid used to wet the substrate, and the wet, coated substrate is treated with additional liquid to deposit the elastomer extending into the upper strata of the substrate and above its surface.</p> |
