| 摘要 |
<p>1,207,389. Porous plastics laminates. FARBENFABRIKEN BAYER A.G. 11 Dec., 1967 [13 Dec., 1966], No. 56167/67. Heading B5N. [Also in Divisions B2 and C3] In an example, a laminate is prepared by bonding with a two-component adhesive a brown twill fabric roughened on one side and a film produced by (i) dissolving polyvinyl chloride in dimethylformamide, (ii) adding to this solution a finely divided silicic acid, a polyurethane-urea solution prepared by reacting a copolyester of adipic acid, hexanediol-(1,6) and 2,2-dimethylpropanediol-(1,3) with diphenylmethane - 4,4<SP>1</SP> - diisocyanate and subsequently carbodihydrazide in dimethylformamide and containing two stabilizers, and a brown water-soluble acid leather dye, (iii) the solution being applied to a glass plate, gelled in a current of air and the gel immersed in water to wash out the solvent and (iv) the film dried. The adhesive may be sprayed on to the film and fabric. The laminate has a permeability to water vapour. Other layers to which similar polyurethane layers may be bonded are specified.</p> |
