Invention Application
US20030134082A1 Carpet comprising a low-shrink backing of polypropylene tape fibers 审中-公开
地毯包括聚丙烯带纤维的低收缩背衬

  • Patent Title: Carpet comprising a low-shrink backing of polypropylene tape fibers
  • Patent Title (中): 地毯包括聚丙烯带纤维的低收缩背衬
  • Application No.: US10036834
    Application Date: 2001-12-21
  • Publication No.: US20030134082A1
    Publication Date: 2003-07-17
  • Inventor: Brian G. MorinMartin E. CowanKenneth Higgins
  • Main IPC: B32B033/00
  • IPC: B32B033/00 D05C017/02
Carpet comprising a low-shrink backing of polypropylene tape fibers
Abstract:
Improvements in preventing heat- and moisture-shrink problems in specific polypropylene tape fibers are provided. Such fibers are basically manufactured through the initial production of polypropylene films or tubes which are then slit into very thin, though flat (and having very high cross sectional aspect ratios) tape fibers thereafter. Such fibers (and thus the initial films and/or tubes) require the presence of certain compounds that quickly and effectively provide rigidity to the target polypropylene tape fiber after beat-setting. Generally, these compounds include any structure that nucleates polymer crystals within the target polypropylene after exposure to sufficient heat to melt the initial pelletized polymer and upon allowing such a melt to cool. The compounds must nucleate polymer crystals at a higher temperature than the target polypropylene without the nucleating agent during cooling. In such a manner, the nullrigidifyingnull nucleator compounds provide nucleation sites for polypropylene crystal growth. Upon slitting of the initial film and/or tube, the fiber is then exposed to sufficient heat to grow the crystalline network, thus holding the fiber in a desired position. The preferred nullrigidifyingnull compounds include dibenzylidene sorbitol based compounds, as well as less preferred compounds, such as sodium benzoate, certain sodium and lithium phosphate salts (such as sodium 2,2null-methylene-bis-(4,6-di-tert-butylphenyl)phosphate, otherwise known as NA-11). Specific methods of manufacture of such inventive tape fibers, as well as fabric articles made therefrom, are also encompassed within this invention.
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