Polyamides derived from alpha-amino carboxylic acids

Industry

CPC
C08J2377/04

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Parent Industries

CCHEMISTRY METALLURGY C08Organic compounds C08JWORKING-UP GENERAL PROCESSES OF COMPOUNDING AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G C08J2377/00Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain Derivatives of such polymers

Current Industry

C08J2377/04Polyamides derived from alpha-amino carboxylic acids

Industries

Patents Grantslast 30 patents

Information Patent Grant
Nano-graphitic sponges and methods for fabricating the same
- Patent number 11,760,640
- Issue date Sep 19, 2023
- Rutgers, The State University of New Jersey
- Thomas J. Nosker
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Prepreg, prepreg laminate, and fiber-reinforced composite material
- Patent number 11,760,053
- Issue date Sep 19, 2023
- Toray Industries, Inc.
- Takuya Yamane
- B32 - LAYERED PRODUCTS
Information Patent Grant
Composite particulate build materials
- Patent number 11,732,150
- Issue date Aug 22, 2023
- Hewlett-Packard Development Company, L.P.
- Ali Emamjomeh
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Poly (amino acid) rheology modifier compositions and methods of use
- Patent number 11,708,464
- Issue date Jul 25, 2023
- Ecovia Renewables Inc.
- Jeremy J. Minty
- A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
Information Patent Grant
Temperature sensitive hydrogel composition including nucleic acid a...
- Patent number 11,672,756
- Issue date Jun 13, 2023
- PharmaResearch Co., Ltd.
- Ik Soo Kim
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Joined body
- Patent number 11,566,154
- Issue date Jan 31, 2023
- Kabushiki Kaisha Toyota Chuo Kenkyusho
- Hisato Takeuchi
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Fiber-reinforced resin composition and method of producing the same
- Patent number 11,365,295
- Issue date Jun 21, 2022
- Toyota Jidosha Kabushiki Kaisha
- Takayuki Hirai
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Processes and systems for preparing cellular or viral membranes and...
- Patent number 11,359,058
- Issue date Jun 14, 2022
- ARYTHA BIOSCIENCES, LLC
- Weiwei Gao
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Bi-polymer thermoplastic
- Patent number 11,274,184
- Issue date Mar 15, 2022
- Joel A. Dyksterhouse
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Caprolactam formulations
- Patent number 11,225,555
- Issue date Jan 18, 2022
- BASF SE
- Philippe Desbois
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Polymer film comprising a copolyamide of a diamine, a dimer acid an...
- Patent number 11,149,124
- Issue date Oct 19, 2021
- BASF SE
- Rolf Minkwitz
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Photo-crosslinked hydrogel material and preparation, composition, a...
- Patent number 11,117,879
- Issue date Sep 14, 2021
- Zhongshan Guanghe Medical Technology Co., Ltd.
- Linyong Zhu
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Sizing agent for carbon fiber, carbon fiber with improved interfaci...
- Patent number 10,570,561
- Issue date Feb 25, 2020
- Korea Institute of Machinery & Materials
- Sangwoo Kim
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Polygonal scaffold and manufacturing method thereof, and protein mo...
- Patent number 10,443,026
- Issue date Oct 15, 2019
- National Tsing Hua University
- Sheng-Kai Wang
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for producing expanded thermoplastic elastomer particles
- Patent number 10,392,488
- Issue date Aug 27, 2019
- BASF SE
- Christian Däschlein
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Polyamide resin foam shaped product and method of producing polyami...
- Patent number 10,167,373
- Issue date Jan 1, 2019
- Asahi Kasei Kabushiki Kaisha
- Motoki Kondo
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for producing shaped articles of a polymer composition cont...
- Patent number 10,113,039
- Issue date Oct 30, 2018
- DSM IP Assets B.V.
- Johannes Hoekstra
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
E-polylysine hydrogel and preparation method and application thereof
- Patent number 9,833,539
- Issue date Dec 5, 2017
- NANJING TECH UNIVERSITY
- Hong Xu
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Hybrid block copolymer micelles with mixed stereochemistry for enca...
- Patent number 8,980,326
- Issue date Mar 17, 2015
- Intezyne Technologies, Inc.
- Kevin N. Sill
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Method for the preparation of highly purified recycled nylon
- Patent number 8,969,426
- Issue date Mar 3, 2015
- DynaSep Inc.
- Brian J. Waibel
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Method for making reinforced polymer matrix composites
- Patent number 8,445,587
- Issue date May 21, 2013
- Applied Nanotech Holdings, Inc.
- Dongsheng Mao
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Controllably degradable hydrogel for culturing cells to produce thr...
- Patent number 8,263,405
- Issue date Sep 11, 2012
- NOF Corporation
- Mitsuru Akashi
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Nylon extraction from commingled materials
- Patent number 8,071,656
- Issue date Dec 6, 2011
- Dynasep LLC
- Brian J. Waibel
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Method for removing color from polymeric material
- Patent number 7,947,750
- Issue date May 24, 2011
- BASF SE
- Ronnie Ozer
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Cyclic olefin-maleic acid copolymers for stain resists
- Patent number 7,914,890
- Issue date Mar 29, 2011
- E. I. DuPont de Nemours and Company
- Stephen Ernest Jacobson
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Hybrid block copolymer micelles with mixed stereochemistry for enca...
- Patent number 7,799,339
- Issue date Sep 21, 2010
- Intezyne Technologies, Inc.
- Kevin N. Sill
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Curable compositions
- Patent number 7,649,060
- Issue date Jan 19, 2010
- Henkel Corporation
- Wei Helen Li
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for nylon depolymerization
- Patent number 6,498,250
- Issue date Dec 24, 2002
- DSM N.V.
- Leonardus J. G. Raets
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Superabsorbing fibers and films and process for preparing same
- Patent number 6,150,495
- Issue date Nov 21, 2000
- Solutia Inc.
- Yueting Chou
- D01 - NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING
Information Patent Grant
Process for recycling and recovery of purified nylon polymer
- Patent number 6,140,463
- Issue date Oct 31, 2000
- Roland E. Stefandl
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...

Patents Applicationslast 30 patents

Information Patent Application
POLY (AMINO ACID) RHEOLOGY MODIFIER COMPOSITIONS AND METHODS OF USE
- Publication number 20240043631
- Publication date Feb 8, 2024
- Ecovia Renewables Inc.
- Jeremy J. Minty
- A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
Information Patent Application
Polymer taking the form of a pulverulent solid and having propertie...
- Publication number 20240026078
- Publication date Jan 25, 2024
- Societe D'Exploitation De Produits Pour Les Industries Chimiques Seppic
- Miruna BODOC
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
HYPERBRANCHED POLYLYSINE POWDER WITH LOW POLYDISPERSITY INDEX AND P...
- Publication number 20240018303
- Publication date Jan 18, 2024
- Zhejiang University
- Changyou GAO
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
Compositions Suitable for Enhancing the Flexural Properties of Obje...
- Publication number 20240010837
- Publication date Jan 11, 2024
- Covestro (Netherlands) B.V.
- Douglas Richard Hayden
- B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...
Information Patent Application
METHOD FOR THE CONTINUOUS PREPARATION OF FORMULATED POLYAMIDE PREPO...
- Publication number 20230407006
- Publication date Dec 21, 2023
- Arkema France
- Sébastien QUINEBECHE
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
COMPOSITION FOR HYDROGEL FORMATION, HYDROGEL FORMED BY PHOTO-CROSSL...
- Publication number 20230295424
- Publication date Sep 21, 2023
- SAMYANG HOLDINGS CORPORATION
- Ji Hyun CHANG
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
MULTILAYER STRUCTURE FOR TRANSPORTING OR STORING HYDROGEN
- Publication number 20230151255
- Publication date May 18, 2023
- Arkema France
- Nicolas DUFAURE
- B32 - LAYERED PRODUCTS
Information Patent Application
FIBER-REINFORCED THERMOPLASTIC RESIN MOLDED ARTICLE
- Publication number 20220403125
- Publication date Dec 22, 2022
- TORAY INDUSTRIES, INC.
- Shin Hirata
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
BI-POLYMER THERMOPLASTIC
- Publication number 20220340721
- Publication date Oct 27, 2022
- Joel A. Dyksterhouse
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
COPOLYAMIDE COMPOSITIONS COMPRISING REINFORCING FIBERS AND HAVING H...
- Publication number 20220153998
- Publication date May 19, 2022
- Arkema France
- Mathieu SABARD
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
NANO-GRAPHITIC SPONGES AND METHODS FOR FABRICATING THE SAME
- Publication number 20210403326
- Publication date Dec 30, 2021
- Rutgers, The State University of New Jersey
- Thomas J. Nosker
- B82 - NANO-TECHNOLOGY
Information Patent Application
PREPREG, PREPREG LAMINATE, AND FIBER-REINFORCED COMPOSITE MATERIAL
- Publication number 20210309819
- Publication date Oct 7, 2021
- TORAY INDUSTRIES, INC.
- Takuya Yamane
- B32 - LAYERED PRODUCTS
Information Patent Application
POLY (AMINO ACID) RHEOLOGY MODIFIER COMPOSITIONS AND METHODS OF USE
- Publication number 20210040275
- Publication date Feb 11, 2021
- Ecovia Renewables Inc.
- Jeremy J. MINTY
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PHOTO-COUPLED SYNERGISTICALLY CROSSLINKED HYDROGEL MATERIAL AND ITS...
- Publication number 20200262939
- Publication date Aug 20, 2020
- Zhongshan Guanghe Medical Technology Co., Ltd.
- Linyong Zhu
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PHOTO-CROSSLINKED HYDROGEL MATERIAL AND PREPARATION, COMPOSITION, A...
- Publication number 20200262802
- Publication date Aug 20, 2020
- Zhongshan Guanghe Medical Technology Co., Ltd.
- Linyong Zhu
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
POLYMER FILM COMPRISING A COPOLYAMIDE OF A DIAMINE, A DIMER ACID AN...
- Publication number 20200123335
- Publication date Apr 23, 2020
- BASF SE
- Rolf MINKWITZ
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Application
POLY (AMINO ACID) RHEOLOGY MODIFIER COMPOSITIONS AND METHODS OF USE
- Publication number 20200095386
- Publication date Mar 26, 2020
- Ecovia Renewables Inc.
- Jeremy J. MINTY
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESSES AND SYSTEMS FOR PREPARING CELLULAR OR VIRAL MEMBRANES AND...
- Publication number 20190382539
- Publication date Dec 19, 2019
- Arytha Biosciences, LLC
- Weiwei GAO
- C12 - BIOCHEMISTRY BEER SPIRITS WINE VINEGAR MICROBIOLOGY ENZYMOLOGY MUTATION...
Information Patent Application
CAPROLACTAM FORMULATIONS
- Publication number 20190382542
- Publication date Dec 19, 2019
- BASF SE
- Philippe Desbois
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
FIBER-REINFORCED RESIN COMPOSITION AND METHOD OF PRODUCING THE SAME
- Publication number 20190367689
- Publication date Dec 5, 2019
- Toyota Jidosha Kabushiki Kaisha
- Takayuki HIRAI
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
THERMOPLASTIC RESIN COMPOSITION, METHOD FOR PRODUCING SAME, AND MOL...
- Publication number 20190284380
- Publication date Sep 19, 2019
- Toyota Boshoku Kabushiki Kaisha
- Keisuke KATO
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
SIZING AGENT FOR CARBON FIBER, CARBON FIBER WITH IMPROVED INTERFACI...
- Publication number 20190284751
- Publication date Sep 19, 2019
- Korea Institute of Machinery and Materials
- Sangwoo KIM
- D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
Information Patent Application
JOINED BODY
- Publication number 20190276720
- Publication date Sep 12, 2019
- KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
- Hisato Takeuchi
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
BI-POLYMER THERMOPLASTIC
- Publication number 20190127539
- Publication date May 2, 2019
- Joel A. Dyksterhouse
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
COMPOSITE PARTICULATE BUILD MATERIALS
- Publication number 20190002714
- Publication date Jan 3, 2019
- Hewlett-Packard Development Company, L.P.
- Ali Emamjomeh
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
NANOPARTICLES AND METHOD FOR PRODUCING SAME
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- Publication date Sep 20, 2018
- Shimadzu Corporation
- Takashi KAWABE
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COLOR MASTERBATCH GLASS-FILLED NYLON COMPOSITES
- Publication number 20180237598
- Publication date Aug 23, 2018
- SABIC Global Technologies B.V.
- Mingcheng GUO
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
NOVEL POLYMER, HYDROGEL INCLUDING THE POLYMER AND MANUFACTURING MET...
- Publication number 20170088680
- Publication date Mar 30, 2017
- Research & Business Foundation Sungkyunkwan University
- Ji Heung KIM
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
HYDROGEL BASED ON γ-POLYGLUTAMIC ACID AND ε-POLYLYSINE CROSSLINKED...
- Publication number 20170014543
- Publication date Jan 19, 2017
- NANJING TECH UNIVERSITY
- Hong Xu
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Application
E-POLYLYSINE HYDROGEL AND PREPARATION METHOD AND APPLICATION THEREOF
- Publication number 20170000924
- Publication date Jan 5, 2017
- NANJING TECH UNIVERSITY
- Hong Xu
- C12 - BIOCHEMISTRY BEER SPIRITS WINE VINEGAR MICROBIOLOGY ENZYMOLOGY MUTATION...

Polyamides derived from alpha-amino carboxylic acids

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Nano-graphitic sponges and methods for fabricating the same

Prepreg, prepreg laminate, and fiber-reinforced composite material

Composite particulate build materials

Poly (amino acid) rheology modifier compositions and methods of use

Temperature sensitive hydrogel composition including nucleic acid a...

Joined body

Fiber-reinforced resin composition and method of producing the same

Processes and systems for preparing cellular or viral membranes and...

Bi-polymer thermoplastic

Caprolactam formulations

Polymer film comprising a copolyamide of a diamine, a dimer acid an...

Photo-crosslinked hydrogel material and preparation, composition, a...

Sizing agent for carbon fiber, carbon fiber with improved interfaci...

Polygonal scaffold and manufacturing method thereof, and protein mo...

Method for producing expanded thermoplastic elastomer particles

Polyamide resin foam shaped product and method of producing polyami...

Process for producing shaped articles of a polymer composition cont...

E-polylysine hydrogel and preparation method and application thereof

Hybrid block copolymer micelles with mixed stereochemistry for enca...

Method for the preparation of highly purified recycled nylon

Method for making reinforced polymer matrix composites

Controllably degradable hydrogel for culturing cells to produce thr...

Nylon extraction from commingled materials

Method for removing color from polymeric material

Cyclic olefin-maleic acid copolymers for stain resists

Hybrid block copolymer micelles with mixed stereochemistry for enca...

Curable compositions

Process for nylon depolymerization

Superabsorbing fibers and films and process for preparing same

Process for recycling and recovery of purified nylon polymer

Patents Applicationslast 30 patents

POLY (AMINO ACID) RHEOLOGY MODIFIER COMPOSITIONS AND METHODS OF USE

Polymer taking the form of a pulverulent solid and having propertie...

HYPERBRANCHED POLYLYSINE POWDER WITH LOW POLYDISPERSITY INDEX AND P...

Compositions Suitable for Enhancing the Flexural Properties of Obje...

METHOD FOR THE CONTINUOUS PREPARATION OF FORMULATED POLYAMIDE PREPO...

COMPOSITION FOR HYDROGEL FORMATION, HYDROGEL FORMED BY PHOTO-CROSSL...

MULTILAYER STRUCTURE FOR TRANSPORTING OR STORING HYDROGEN

FIBER-REINFORCED THERMOPLASTIC RESIN MOLDED ARTICLE

BI-POLYMER THERMOPLASTIC

COPOLYAMIDE COMPOSITIONS COMPRISING REINFORCING FIBERS AND HAVING H...

NANO-GRAPHITIC SPONGES AND METHODS FOR FABRICATING THE SAME

PREPREG, PREPREG LAMINATE, AND FIBER-REINFORCED COMPOSITE MATERIAL

POLY (AMINO ACID) RHEOLOGY MODIFIER COMPOSITIONS AND METHODS OF USE

PHOTO-COUPLED SYNERGISTICALLY CROSSLINKED HYDROGEL MATERIAL AND ITS...

PHOTO-CROSSLINKED HYDROGEL MATERIAL AND PREPARATION, COMPOSITION, A...

POLYMER FILM COMPRISING A COPOLYAMIDE OF A DIAMINE, A DIMER ACID AN...

POLY (AMINO ACID) RHEOLOGY MODIFIER COMPOSITIONS AND METHODS OF USE

PROCESSES AND SYSTEMS FOR PREPARING CELLULAR OR VIRAL MEMBRANES AND...

CAPROLACTAM FORMULATIONS

FIBER-REINFORCED RESIN COMPOSITION AND METHOD OF PRODUCING THE SAME

THERMOPLASTIC RESIN COMPOSITION, METHOD FOR PRODUCING SAME, AND MOL...

SIZING AGENT FOR CARBON FIBER, CARBON FIBER WITH IMPROVED INTERFACI...

JOINED BODY

BI-POLYMER THERMOPLASTIC

COMPOSITE PARTICULATE BUILD MATERIALS

NANOPARTICLES AND METHOD FOR PRODUCING SAME

COLOR MASTERBATCH GLASS-FILLED NYLON COMPOSITES

NOVEL POLYMER, HYDROGEL INCLUDING THE POLYMER AND MANUFACTURING MET...

HYDROGEL BASED ON γ-POLYGLUTAMIC ACID AND ε-POLYLYSINE CROSSLINKED...

E-POLYLYSINE HYDROGEL AND PREPARATION METHOD AND APPLICATION THEREOF