| 摘要 |
A process for improving the dyeability of a polyolefin comprises contacting the polymer with the vapours of an organic isocyanate at an elevated temperature not above the fusion point of the polymer, e.g. at 100 DEG C., and then preferably heating in a current of inert gas to fix the isocyanate and remove excess thereof. In the examples polypropylene fabrics are treated with 2,4-tolylene diisocyanate and dyed with metallizable monoazo and chromium complex dyestuffs.ALSO:A polyolefin in the form of film, filament, yarn, fabric, rope or particles may be dyed by a process comprising treating the polyolefin with the vapours of an organic isocyanate at an elevated temperature not above the fusion point of the polymer, e.g. at 100 DEG C., then preferably heating in a current of inert gas to fix the isocyanate and remove excess thereof, and finally dyeing in conventional manner preferably with metallized or metallizable dyestuffs. In the examples polypropylene is treated with 2, 4-tolylene diisocyanate and dyed with metallizable monoazo and chromium complex dyestuffs.
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