US 7,214,727 B2Granted

Solution containing cellulose dissolved in N-methylmorpholine-N-oxide and high tenacity lyocell multifilament using the same

AssigneeHyosung Corporation

InventorsIk-Hyeon Kwon, Soo-Myung Choi, Young-Soo Wang, Sung-Ryong Kim, Jae-Shik Choi, Tae-Jung Lee, Seok-Jong Han, Myung-Woo Kim

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Abstract

This invention relates to a method of preparing cellulose solution which is homogeneous at relatively low temperature, in which a small amount of cellulose powder or polyvinylalcohol is dissolved in the liquid-state, concentrated N-methylmorpholine-N-oxide (hereinafter, referred to as ‘NMMO’) so as to lower the solidifying temperature of NMMO, and then, the resulting solution and cellulose powder are fed into an extruder so as to be mixed, swollen and melted in the extruder.

Claims9

Dependent claims

A method of preparing cellulose solution, comprising the steps of:

(A) dissolving cellulose powder in a liquid-state, concentrated N-methylmorpholine-N-oxide (NMMO) solution to provide cellulose-containing NMMO solution containing 0.01 to 3 wt % cellulose with respect to the total weight of the cellulose-containing NMMO solution, wherein the concentrated NMMO solution contains 10 to 18 wt % water with respect to the total weight of the NMMO solution;
and
(B) feeding the cellulose-containing NMMO solution and additional cellulose powder into an extruder having a screw wherein the cellulose-containing NMMO solution and additional cellulose powder are subjected to dispersing, mixing, shearing, kneading, melting and measuring processes in the extruder so as to produce cellulose solution that is swollen and homogenized.

Dependencies are inferred from the claim text.

Facts

Application: 10/481,105Filed 24 Oct 2003
Priority: KR 10-2003-004325430 Jun 2003
Published: US 2005/0154093 A114 Jul 2005
Granted: 8 May 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B60C 9/0042
Reinforcements or ply arrangement of pneumatic tyres: reinforcements made of synthetic materials
C08B 1/003
Preparatory treatment of cellulose for making derivatives thereof , e.g. pre-treatment, pre-soaking, activation: preparation of cellulose…
D01F 2/00
Monocomponent artificial filaments or the like of cellulose or cellulose derivatives
D02G 3/48
Yarns or threads characterised by the purpose for which they are designed: tyre cords