Abstract:
PROCESS FOR IMPROVING THE ADHESIVENESS OF A MICROPOROUS ARTIFICIAL LEATHER WHILE RETAINING ITS PERMEABILITY TO WATER VAPOR, PARTICULARLY AS A PRETREATMENT STEP IN ADHERING THE ARTIFICIAL LEATHER WITH AN AQUEOUS LATEX ADHESIVE, BY TREATING SAID LEATHER AS A SUBSTRATE WITH AN AQUEOUS SOLUTION OF A WEAKLY ACIDIC ELECTROLYTE IN AN AMOUNT SUFFICIENT TO YIELD A PH-VALUE ON THE SURFACE OF THE ARTIFICIAL LEATHER OF FROM ABOUT 2 UP TO LESS THAN 7.
Abstract:
1,253,677. Bonding artificial leather. GLANZSTOFF A.G. 21 Nov., 1968 [23 Jan., 1968], No. 55223/68. Heading B5N. [Also in Division Dl] The adhesive properties of artificial leather which comprises a non-woven fibre structure which has been bonded and then impregnated with an elastomeric polymer are improved by applying thereto an aqueous electrolyte solution so that the artificial leather assumes a pH value of from 2 up to 7. The artificial leather may be treated with aqueous solutions of salts having a pH value of 2-7 when measured on a 10% by weight solution, or with a weak, non- volatile, organic acids in 1-10% by weight aqueous solutions. Aqueous solutions of salts of chromium, aluminium, zinc, iron, calcium or ammonium, e.g. zinc chloride, chromium chloride, iron chloride, calcium chloride or ammonium chloride, of sodium chloride and ammonium chloride or of citric acid, may be used. The artificial leather may be of a bonded non-woven fibre structure impregnated with a polyurethane or polyacrylate, and the treatment with the electrolyte solution may be effected on the finished artificial leather or in the final stage of the manufacturing process. The treated artificial leather may be bonded with natural leather or other treated artificial leather using aqueous dispersions of natural rubber, polychloroprene or a polyurethane.
Abstract:
1,270,482. Finishing edges. GLANZSTOFF A.G. 3 Sept., 1970 [20 Nov., 1969], No. 42190/70. Heading B5K. [Also in Division A3] A shoe upper of synthetic material, e.g. a poromeric material, has a turned top-line edge which contains a woven or braided reinforcement band comprising at least 60% by weight of an elastomer yarn having a polyurethane base. The reinforcement band is worked into the turned edge under a stretch of 10 to 50%, preferably 15 to 20%, to prevent bagging of the top line. The band may be woven entirely from elastomer yarn or may have a warp of elastomer yarn and a weft of nylon or cotton yarn.