Treatment for improving polypropylene dyeability
Abstract
Abstract POLYPROPHYLENE FIBERS ARE DIFFICULT TO DYE. THE PRIOR ART HAS SHOWN THAT THEIR DYEABILITY IS IMPROVED TO A CERTAIN DEGREE BY THE INCORPORATION THEREIN OF MINOR AMOUNTS OF POLYMERIC VINYL PYRIDINES. IT HAS NOW EEN FOUND THAT THE DYEABILITY OF THE MODIFIED, I.E., VINYL PYRIDINE-CONTAINING POLYPROPYLENE, IS FURTHER MARKEDLY IMPROVED BY PRE-TREATMENT THEREOF WITH AN AQUEOUS COMPOSITION CONTAINING FROM ABOUT 0.25% TO ABOUT 4%, BASED ON THE WEIGHT OF THE FIBER, OF AN ANIONIC SURFACE-ACTIVE AGENT, SUCH AS SODIUM DODECYL SULFATE, AND SUFFICIENT ACID, SUCH AS SULFURIC OR FORMIC ACID, TO PROVIDE A PH NO HIGHER THAN 6 AT A TEMPERATURE OF FROM ABOUT 140 TO ABOUT 250*F. THUS, FOR EXAMPLE, WITHOUT THE PRE-TREATMENT, THE MODIFIED FIBERS ARE ONLY WEAKLY DYEABLE WITH DYES, SUCH AS SOLVENT RED 106, A SPIRIT DYE, ACID YELLOW 42, AND ACID DYE, RHODAMINE B, A BASIC DYE, AND VAT JADE GREEN, A VAT DYE; HOWEVER, WITH THE PRE-TREATMENT THE FIBERS ARE STRONGLY DYEABLE WITH THESE DYES.
Inventors
- 👤 Jerry Michael Mecco
Bibliographic Details
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