公开(公告)号：US11773239B2

公开(公告)日：2023-10-03

申请号：US16480618

申请日：2018-01-17

Applicant: DAICEL CORPORATION

Inventor： Ikuhiro Suzuki ,  Yuya Ashida ,  Akihiro Higuchi

IPC: C08L1/12 ,  C08B3/06

CPC classification number: C08L1/12 ,  C08B3/06

Abstract: The purpose of the present invention is to provide a cellulose acetate excellent in transparency, and a molded article of the cellulose acetate.
In the cellulose acetate, an acetylation degree is 52% or more and 59% or less, and a content of low-molecular-weight components having a molecular weight of not more than ¼ of a peak top molecular weight in a molecular weight distribution measured by gel permeation chromatography of cellulose acetate is 12% or less.

公开(公告)号：US11572457B2

公开(公告)日：2023-02-07

申请号：US17715989

申请日：2022-04-08

Applicant: Daicel Corporation

Inventor： Hiroyuki Matsumura ,  Hiroki Taniguchi ,  Akihiro Higuchi ,  Tomohiro Hashizume ,  Masaaki Kusumoto

IPC: C08L1/12 ,  C08K3/22 ,  C08K5/10

Abstract: This cellulose acetate has a total degree of acetyl substitution of 1.75 or more and 2.55 or less, and a degree of acetyl substitution at 2-position or a degree of acetyl substitution at 3-position is 0.7 or less. This cellulose acetate composition includes the cellulose acetate and an additive. The additive is one or more selected from the group consisting of (a) substances of which a pH of a 1 wt. % aqueous solution at 20° C. is 8 or more, (b) substances that dissolve in water at 20° C. in an amount of 2 wt. % or more, and (c) substances that exhibit biodegradability in seawater.

公开(公告)号：US11066484B2

公开(公告)日：2021-07-20

申请号：US16067904

申请日：2016-01-12

Applicant: DAICEL CORPORATION

Inventor： Naohiro Oyamada ,  Akihiro Higuchi

IPC: C08B3/06

Abstract: Provided is cellulose acetate with which a hollow fiber membrane having excellent salt rejection and water permeability can be produced. The cellulose acetate, in which a total content of calcium and magnesium is 2.8 to 3.5 μmol/g; a 6 percent viscosity is 40 to 80 mPa·s; a degree of filtration Kw is 35 g−1 or less; a molecular weight distribution Mw/Mn is 3.00 or less; and a degree of acetylation is 61.3 to 62.3%.

公开(公告)号：US12157808B2

公开(公告)日：2024-12-03

申请号：US18086673

申请日：2022-12-22

Applicant: Daicel Corporation

Inventor： Hiroyuki Matsumura ,  Hiroki Taniguchi ,  Akihiro Higuchi ,  Tomohiro Hashizume ,  Masaaki Kusumoto

IPC: C08L1/12 ,  C08K3/22 ,  C08K5/10

Abstract: This cellulose acetate has a total degree of acetyl substitution of 1.75 or more and 2.55 or less, and a degree of acetyl substitution at 2-position or a degree of acetyl substitution at 3-position is 0.7 or less. This cellulose acetate composition includes the cellulose acetate and an additive. The additive is one or more selected from the group consisting of (a) substances of which a pH of a 1 wt. % aqueous solution at 20° C. is 8 or more, (b) substances that dissolve in water at 20° C. in an amount of 2 wt. % or more, and (c) substances that exhibit biodegradability in seawater.

公开(公告)号：US11440973B2

公开(公告)日：2022-09-13

申请号：US16480515

申请日：2018-01-17

Applicant: DAICEL CORPORATION

Inventor： Yuya Ashida ,  Ikuhiro Suzuki ,  Akihiro Higuchi

IPC: C08B3/06 ,  C08J5/18

Abstract: The purpose of the present invention is to provide cellulose acetate with which it is possible to obtain a molded article containing cellulose acetate having a small amount of lumps. The cellulose acetate has an acetylation degree of 52% or more and 59% or less, and an acetone-insoluble substance content of 0.04 wt % or less.

公开(公告)号：US12240961B2

公开(公告)日：2025-03-04

申请号：US18106507

申请日：2023-02-07

Applicant: Daicel Corporation

Inventor： Masaaki Kusumoto ,  Takafumi Kawasaki ,  Akihiro Higuchi

IPC: C08L1/12 ,  C08L71/10

Abstract: The cellulose acetate resin composition may include: a cellulose acetate having a total degree of acetyl substitution of 1.9 or greater and 2.6 or less; and a plasticizer. The cellulose acetate may have a number average molecular weight of 45000 or greater and a weight average molecular weight of 70000 or greater. The plasticizer may be selected from (1) an ether-based plasticizer in which at least one terminal hydroxyl group of a polyalkylene glycol is etherified, and (2) an ester-based plasticizer in which at least one terminal hydroxyl group of a polyalkylene glycol is esterified. The polyalkylene glycol in the ether-based plasticizer (1) and the ester-based plasticizer (2) may have a degree of polymerization of 3 or greater and less than 10. The plasticizer may not include an aromatic ring in the terminal group.

公开(公告)号：US11981796B2

公开(公告)日：2024-05-14

申请号：US17978224

申请日：2022-11-01

Applicant: Daicel Corporation

Inventor： Masaaki Kusumoto ,  Takafumi Kawasaki ,  Akihiro Higuchi

IPC: C08L1/12 ,  C08J5/18 ,  C08K3/22 ,  C08K3/26 ,  C08K3/34 ,  C08K5/11 ,  C09D101/02

CPC classification number: C08L1/12 ,  C08J5/18 ,  C08K3/22 ,  C08K3/26 ,  C08K3/346 ,  C08K5/11 ,  C09D101/02 ,  C08J2301/12 ,  C08K2003/222 ,  C08K2003/265

Abstract: A cellulose acetate resin composition may include a cellulose acetate (A) having a total degree of acetyl substitution of 2.60 or less; a filler (B); and a plasticizer (C). The filler (B) may be selected from the group consisting of (b1) a predetermined inorganic compound, (b2) a predetermined metal salt, (b3) cellulose or hemicellulose, and (b4) wood flour. The plasticizer (C) may be selected from (c1) a glycerin ester-based plasticizer, (c2) an ether-based plasticizer, and (c3) a glycol ester-based plasticizer. A content of the component (A) may be from 4.5 to 90 mass %. A total content of the component (B) may be from 5 to 50 mass %. A total content of the component (C) may be from 5 to 35 mass %.

公开(公告)号：US10927189B2

公开(公告)日：2021-02-23

申请号：US16327054

申请日：2017-08-21

Applicant: DAICEL CORPORATION

Inventor： Maiko Tsuda ,  Akihiro Higuchi

IPC: C08B3/06 ,  C08B1/02 ,  C08B17/02 ,  B02C7/16 ,  B02C13/04

Abstract: The purpose of the present invention is to provide a cellulose acetate which can be used to obtain an optical film having a very small amount of bright spot foreign matters, with excellent production efficiency, even when cellulose containing a small amount of hemicellulose components and having a high degree of crystallinity is used as a raw material. A cellulose acetate in which a content ratio by mole of mannose units to a sum of xylose units, mannose units and glucose units, which are sugar chain components, is 0.04 mol % or less, and a filtration index K measured by the following measurement method is 30 mL−1 or less. (Measurement method) The cellulose acetate is dissolved in a mixed solvent containing methylene chloride and methanol at a weight ratio of methylene chloride/methanol of 9/1 to obtain a solution with a solid concentration of 16% by weight. The temperature of the solution is adjusted to 25° C., and the solution is subjected to constant-pressure filtration under a pressure of 3 kg/cm2 using a cloth obtained by stacking three sheets of calico (s 618) (diameter: 15 mm, filtration area: 1.77 cm2). At this time, the filtration index k (mL−1) is calculated from the following expression, where P1 represents the amount of filtration (mL) up to 20 minutes after the start of filtration, and P2 represents the amount of filtration (mL) from 0 to 60 minutes. Filtration ⁢ ⁢ index ⁢ ⁢ K = 2 - P 2 / P 1 P 1 + P 2 × 10 4 [ Mathematical ⁢ ⁢ Formula ⁢ ⁢ 1 ]