Preparation of polyolefinic yarn having high strength and high modulus

Abstract

Abstract PURPOSE:To obtain the titled inexpensive yarn having high quality, by spinning a solution of an ultra-high-molecular-weight polyolefin, predrawing it, drying it, drawing it further in a multiple stage under specific conditions. CONSTITUTION:A polyolefinic polymer such as straight-chain high-density polyolefin, etc. having >=5X10<5> weight-average molecular weight is dissolved in a solvent such as decalin, etc. to prepare 5-15wt% solution. The solution is then spun, it is once drawn at <=10 times draw ratio while the still contains the solvent and/or a coagulating agent. It is furthr dried, and drawn in a multiple stage conditions shown by the formula I (n is number of drawing stages), formula II[Qn is drawing temperature at n stage, Tn-1 is melting point at drawn yarn at (n-1) stage], formula III [thetan-1 is drawing temperature at (n-1) stage], and formula IV (Rn is draw ratio at n stage; BRn is draw ratio at break at n stage), to give the aimed yarn.

Inventors

• 👤 Yutaka Nishikawa
• 👤 西河　裕
• 👤 Masaharu Mizuno
• 👤 正春 水野
• 👤 Kotaro Fujioka
• 👤 藤岡　幸太郎

Bibliographic Details