Organic fibers having improved slip properties produced by treatment with organosilicon compounds

A process for improving the slipping properties of organic fibers which comprises applying to said organic fibers a polymeric organosilicon compound of the formula:

• M.sub.a R.sub.b Si{[(OSiR.sub.2).sub.n D].sub.m (OSiR.sub.2).sub.n OSiR.sub.3-d M.sub.d }.sub.4--a--b
• wherein R is selected from the group consisting of hydrocarbon radicals and substituted hydrocarbon radicals having from 1 to 10 carbon atoms, D is a radical of the formula
• --X.sub.a --A--X.sub.a --(A--X.sub.a).sub.c --,
• where X is selected from the group consisting of ##STR5## --NR'--, --O--, --S--, --SO.sub.2 --, --R"--, --NR'R", ##STR6## --OR"--, --SR"--, --SO.sub.2 R", where R' is hydrogen or R, R" is a bivalent aliphatic hydrocarbon radical, A is selected from the group consisting of a bivalent aromatic hydrocarbon radical or substituted bivalent aromatic hydrocarbon radical, M is a radical of the formula
• --X.sub.a --A--X.sub.a --(A--X.sub.a).sub.c --H,
• a is 0 or 1, b is 0, 1 or 2, c is 0 or a number of from 1 to 5, d is 0 or 1 but the same in each instance, m is 0 or a number of from 1 to 20, n is a number of from 1 to 1,000 with the proviso that at least one --X.sub.a --A--X.sub.a --A-group must be present for each molecule.