公开(公告)号：US20190077885A1

公开(公告)日：2019-03-14

申请号：US16081373

申请日：2016-03-15

Applicant: DAICEL CORPORATION

Inventor： Hiroyuki MATSUMURA ,  Keita TAKAHASHI

IPC: C08B3/06 ,  D21C1/04 ,  D21C3/04 ,  D21C3/26

Abstract: Disclosed herein is cellulose acetate that has excellent heat stability under wet conditions and is capable of reducing the occurrence of end-breakage in a spinning process.Cellulose acetate satisfying the following formula (1): [Mg/H2SO4]>0,[Ca/H2SO4]>0, and 2.70−[Mg/H2SO4])/1.62≤[Ca/H2SO4]≤(37.7−[Mg/H2SO4])/10.3  (1), where the formula (1) represents a relationship between a chemical equivalent ratio of calcium content to residual sulfuric acid content [Ca/H2SO4] and a chemical equivalent ratio of magnesium content to residual sulfuric acid content [Mg/H2SO4].

公开(公告)号：US20210079561A1

公开(公告)日：2021-03-18

申请号：US16959649

申请日：2019-07-10

Applicant: DAICEL CORPORATION

Inventor： Takehiro MATSUMOTO ,  Hiroaki TAMAGAKI ,  Keita TAKAHASHI ,  Takahiko SHIMA

IPC: D01F2/28 ,  A24D3/10 ,  D01F1/10

Abstract: An object is to mitigate clogging of spinneret holes which occurs as the passage of spinning time even though cellulose acetate has a small titanium oxide content or contains no titanium oxide and to prevent a reduction in pressure drop of a cellulose acetate band. A cellulose acetate fiber, in which a titanium oxide content is not greater than 0.05 wt. %, a calcium content is not greater than 20 ppm, and a magnesium content is not less than 30 ppm.