KR102831628B1 - 섬유상 셀룰로오스 복합 수지 및 그의 제조 방법, 그리고 수지의 보강재 - Google Patents

섬유상 셀룰로오스 복합 수지 및 그의 제조 방법, 그리고 수지의 보강재 Download PDF

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KR102831628B1
KR102831628B1 KR1020217026963A KR20217026963A KR102831628B1 KR 102831628 B1 KR102831628 B1 KR 102831628B1 KR 1020217026963 A KR1020217026963 A KR 1020217026963A KR 20217026963 A KR20217026963 A KR 20217026963A KR 102831628 B1 KR102831628 B1 KR 102831628B1
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resin
cellulose
acid
microfiber
carbamate
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KR20210148087A (ko
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잇코 마츠스에
유 오치아이
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다이오 페이퍼 코퍼레이션
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/08—Cellulose derivatives
    • C08L1/10—Esters of organic acids, i.e. acylates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/045—Reinforcing macromolecular compounds with loose or coherent fibrous material with vegetable or animal fibrous material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes
    • C08B15/05—Derivatives containing elements other than carbon, hydrogen, oxygen, halogens or sulfur
    • C08B15/06—Derivatives containing elements other than carbon, hydrogen, oxygen, halogens or sulfur containing nitrogen, e.g. carbamates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/005—Processes for mixing polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/08—Cellulose derivatives
    • C08L1/26—Cellulose ethers
    • C08L1/28—Alkyl ethers
    • C08L1/288—Alkyl ethers substituted with nitrogen-containing radicals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C08L101/06—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
    • C08L101/08—Carboxyl groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2401/02—Cellulose; Modified cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2401/08—Cellulose derivatives
    • C08J2401/10—Esters of organic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/26—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Reinforced Plastic Materials (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
KR1020217026963A 2019-03-29 2020-03-12 섬유상 셀룰로오스 복합 수지 및 그의 제조 방법, 그리고 수지의 보강재 Active KR102831628B1 (ko)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2019065313A JP7460329B2 (ja) 2019-03-29 2019-03-29 繊維状セルロース複合樹脂及びその製造方法、並びに樹脂の補強材
JPJP-P-2019-065313 2019-03-29
PCT/JP2020/010872 WO2020203147A1 (ja) 2019-03-29 2020-03-12 繊維状セルロース複合樹脂及びその製造方法、並びに樹脂の補強材

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KR20210148087A KR20210148087A (ko) 2021-12-07
KR102831628B1 true KR102831628B1 (ko) 2025-07-09

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US (1) US12435211B2 (https=)
EP (1) EP3922428A4 (https=)
JP (2) JP7460329B2 (https=)
KR (1) KR102831628B1 (https=)
CN (1) CN113474140A (https=)
CA (1) CA3130911A1 (https=)
WO (1) WO2020203147A1 (https=)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7483461B2 (ja) * 2019-12-05 2024-05-15 日本製紙株式会社 樹脂組成物の製造方法
US20220259411A1 (en) * 2019-12-05 2022-08-18 Nippon Paper Industries Co., Ltd. Master batch and resin composition
WO2021112182A1 (ja) * 2019-12-05 2021-06-10 日本製紙株式会社 樹脂組成物の製造方法
JP7483462B2 (ja) * 2019-12-05 2024-05-15 日本製紙株式会社 樹脂組成物の製造方法
JP2021143239A (ja) * 2020-03-11 2021-09-24 大王製紙株式会社 繊維状セルロース、繊維状セルロース複合樹脂及び繊維状セルロースの製造方法
JP7483418B2 (ja) * 2020-03-11 2024-05-15 大王製紙株式会社 繊維状セルロースの製造方法、及び繊維状セルロース複合樹脂の製造方法
JP7575881B2 (ja) * 2020-03-26 2024-10-30 大王製紙株式会社 繊維状セルロース、繊維状セルロース複合樹脂及び繊維状セルロースの製造方法
JP7575880B2 (ja) * 2020-03-26 2024-10-30 大王製紙株式会社 繊維状セルロース、繊維状セルロース複合樹脂及び繊維状セルロースの製造方法
JP7227186B2 (ja) * 2020-06-17 2023-02-21 大王製紙株式会社 繊維状セルロース及び繊維状セルロース複合樹脂
JP7097928B2 (ja) * 2020-08-04 2022-07-08 大王製紙株式会社 繊維状セルロースの製造方法及び繊維状セルロース複合樹脂の製造方法
CN116390893B (zh) 2020-09-29 2025-09-19 株式会社日本触媒 氨分解催化剂
JP7213926B2 (ja) * 2020-10-26 2023-01-27 大王製紙株式会社 繊維状セルロースの製造方法及び繊維状セルロース複合樹脂の製造方法
WO2022091580A1 (ja) * 2020-10-26 2022-05-05 大王製紙株式会社 繊維状セルロースの製造方法及び繊維状セルロース複合樹脂の製造方法
JP7265514B2 (ja) * 2020-10-30 2023-04-26 大王製紙株式会社 セルロース繊維含有物の製造方法、及びセルロース繊維複合樹脂の製造方法
JP7159510B1 (ja) * 2021-03-26 2022-10-24 日本製紙株式会社 樹脂複合体の製造方法
JP7213296B2 (ja) * 2021-03-31 2023-01-26 大王製紙株式会社 繊維状セルロース含有物、繊維状セルロース複合樹脂、及び繊維状セルロース含有物の製造方法
JP7151024B1 (ja) * 2021-04-21 2022-10-11 日本製紙株式会社 繊維強化樹脂マスターバッチ、樹脂組成物、繊維強化樹脂マスターバッチの製造方法、及び樹脂組成物の製造方法
WO2022224716A1 (ja) * 2021-04-21 2022-10-27 日本製紙株式会社 繊維強化樹脂マスターバッチ、樹脂組成物、繊維強化樹脂マスターバッチの製造方法、及び樹脂組成物の製造方法
JP7354203B2 (ja) * 2021-09-27 2023-10-02 大王製紙株式会社 マイクロ繊維セルロース固形物、マイクロ繊維セルロース固形物の製造方法
JP7807281B2 (ja) * 2021-09-29 2026-01-27 日本製紙株式会社 樹脂組成物の製造方法
JP7748255B2 (ja) * 2021-10-27 2025-10-02 大王製紙株式会社 繊維状セルロース複合樹脂
JP7440574B2 (ja) * 2022-07-07 2024-02-28 大王製紙株式会社 繊維状セルロース複合樹脂
JP2024051836A (ja) * 2022-09-30 2024-04-11 大王製紙株式会社 カルバメート化セルロース繊維の製造方法
JP7499816B2 (ja) * 2022-09-30 2024-06-14 大王製紙株式会社 繊維状セルロース複合樹脂、繊維状セルロース含有物、及び繊維状セルロース複合樹脂の製造方法
JP7516692B1 (ja) * 2022-10-31 2024-07-16 日本製紙株式会社 樹脂組成物の製造方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019001876A (ja) * 2017-06-14 2019-01-10 国立大学法人京都大学 微細セルロース繊維、その製造方法、スラリー及び複合体

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5153116A (en) * 1974-11-02 1976-05-11 Kawasaki Heavy Ind Ltd Deiizerukikanno kakyukukireikyakusochi
JP5194938B2 (ja) * 2008-03-27 2013-05-08 トヨタ紡織株式会社 植物性繊維複合材の製造方法
JP2012158842A (ja) 2011-01-31 2012-08-23 Toray Ind Inc 繊維、その製造方法および撥水性布帛
JP5327411B1 (ja) 2012-01-23 2013-10-30 東レ株式会社 繊維、その製造方法および撥水性布帛
JP2013159866A (ja) * 2012-02-01 2013-08-19 Daio Paper Corp クラフト紙
WO2014034071A1 (ja) 2012-08-31 2014-03-06 東レ株式会社 熱可塑性樹脂組成物および成形品
CN103539922B (zh) * 2013-09-10 2015-05-27 中国林业科学研究院林产化学工业研究所 纤维素纳米晶须复合双组分萜烯基水性聚氨酯及其制备方法及用途
KR101720851B1 (ko) 2015-01-29 2017-03-28 포항공과대학교 산학협력단 세포의 지질막에서 유래된 나노소포체 및 이의 용도
JP6622563B2 (ja) 2015-10-29 2019-12-18 京セラ株式会社 積層体
JP7125697B2 (ja) * 2015-12-03 2022-08-25 国立大学法人京都大学 樹脂組成物及びその製造方法
WO2018012643A1 (ja) * 2016-07-15 2018-01-18 スターライト工業株式会社 樹脂組成物およびその製造方法
US11390728B2 (en) * 2016-12-28 2022-07-19 Asahi Kasei Kabushiki Kaisha Cellulose-containing resin composition and cellulosic ingredient
JP6937594B2 (ja) * 2017-03-23 2021-09-22 日鉄ケミカル＆マテリアル株式会社 炭素繊維強化樹脂組成物用の密着性付与剤

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019001876A (ja) * 2017-06-14 2019-01-10 国立大学法人京都大学 微細セルロース繊維、その製造方法、スラリー及び複合体

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CN113474140A (zh) 2021-10-01
JP7460329B2 (ja) 2024-04-02
US12435211B2 (en) 2025-10-07
EP3922428A1 (en) 2021-12-15
US20220135781A1 (en) 2022-05-05
JP2024071477A (ja) 2024-05-24
KR20210148087A (ko) 2021-12-07
JP7734780B2 (ja) 2025-09-05
EP3922428A4 (en) 2022-11-23
CA3130911A1 (en) 2020-10-08
WO2020203147A1 (ja) 2020-10-08
JP2020163651A (ja) 2020-10-08

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