Mikroporoese Flaechengebilde

摘要

1,225,649. Porous laminates. FARBENFABRIKEN BAYER A.G. 30 July, 1968 [9 Aug., 1967; 7 Dec., 1967 (2)], No. 36277/68. Heading B5N. [Also in Divisions B2 and C3] A microporous polyurethane foil may be glued on to bonded fleece, split leather or fabric by means of discontinuous layers of adhesive, according to Example 7. The foil is prepared by forming a sloution of a polyester prepared from adipic acid, diethylene glycol and 1,1,1- trihydroxymethylpropane, butane-1,4 diol and diazabicyclooctane as catalyst in butyl acetate and adding to this solution a solution of phenylene-1,4-diisocyanate in xylene and butyl acetate, flowing the resulting mixture on to a conveyer band made of glass fibre fabric coated with polytetrafluoroethylene and moving the conveyer band through a heating zone in which the solvents are evaporated. The microporous foil is then stripped from the conveyer band.