公开(公告)号：US20180037670A1

公开(公告)日：2018-02-08

申请号：US15553669

申请日：2015-02-26

Applicant: DAICEL CORPORATION

Inventor： Akihiro HIGUCHI ,  Takehiro MATSUMOTO

IPC: C08B3/06 ,  C08L1/12

CPC classification number: C08B3/06 ,  C08L1/12 ,  C08L2205/18

Abstract: Provided is a cellulose acetate powder that makes it possible to reduce the formation of spotty patches on a formed article of the cellulose acetate and prevent lowering of the production process passability of the formed article. A cellulose acetate powder includes cellulose acetate having an acetylation degree of 53 to 56% and a 6% viscosity of 30 to 200 mPa·s. In the cellulose acetate powder, a cumulative pore volume is not less than 0.200 ml/g; a proportion of particles having a particle diameter of not less than 500 μm is not higher than 40%; and an angle of repose is not greater than 51°.

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.