Adhesive-coating glass fibers and the resulting coated fibers

Claim 1

A process for adhesive-coating glass fibers, characterised in that the glass fibers are impregnated by means of a composition consisting essentially of a solution A produced from: ______________________________________ softened water 433 parts by weight resorcinol 36.6 parts by weight sodium hydroxide 1 to 3.50 parts by weight 40% strength formaldehyde 21.3 to 50.0 parts by weight ______________________________________ and a latex solution B consisting essentially of: ______________________________________ softened water 0 to 292 parts by weight 60% strength natural latex 213 to 428 parts by weight 40% strength latex based on vinylpyridine 640 to 960 parts by weight ______________________________________ in which: the total weight of solids relative to the bath varies between about 30 and 35%; the formaldehyde/resorcinol molar ratio varies between 0.85 and 2; the dry weight of latex relative to the resorcinol/formaldehyde resin varies between about 8.5/1 and 11/1; the final pH is 9.6±0.2; and the proportion by weight of dry resorcinol/formaldehyde resin relative to the amount of all the products varies between 10 and 12% and in that the fibers passing through the bath are subjected to vibratory movements communicated directly to the fibers.