on to butene polymers

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CPC
C08F255/10

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CCHEMISTRY METALLURGY C08Organic compounds C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS C08F255/00Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00

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C08F255/10on to butene polymers

Industries

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Patents Grantslast 30 patents

Information Patent Grant
Organic electronic device including encapsulation layer
- Patent number 12,101,958
- Issue date Sep 24, 2024
- LG Chem, Ltd.
- Hyun Jee Yoo
- B32 - LAYERED PRODUCTS
Information Patent Grant
Resin composition, adhesive member, and display device including th...
- Patent number 12,071,500
- Issue date Aug 27, 2024
- Samsung Display Co., Ltd.
- Tetsuya Fujiwara
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Modified polyolefin resin and dispersion composition thereof
- Patent number 12,071,499
- Issue date Aug 27, 2024
- NIPPON PAPER INDUSTRIES CO., LTD.
- Ryo Koike
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Anionic graft polymerization onto an existing polymer chain by orga...
- Patent number 11,834,538
- Issue date Dec 5, 2023
- ExxonMobil Chemical Patents Inc.
- Jason A. Mann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Composition comprising styrene isobutylene block copolymer and ethy...
- Patent number 11,643,494
- Issue date May 9, 2023
- 3M Innovative Properties Company
- Vasav Sahni
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Latex of acid-modified conjugated diene-based polymer, and method f...
- Patent number 11,466,106
- Issue date Oct 11, 2022
- Zeon Corporation
- Yoshitaka Satoh
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Polymer composition for stereolithography
- Patent number 11,421,066
- Issue date Aug 23, 2022
- Sumitomo Rubber Industries, Ltd.
- Mutsuki Sugimoto
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Product, composition and application thereof, and automobile tire i...
- Patent number 10,894,881
- Issue date Jan 19, 2021
- China Petroleum and Chemical Corporation
- Yingxin Qiu
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Multi-functionally modified polymer binder for lithium ion batterie...
- Patent number 10,882,990
- Issue date Jan 5, 2021
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences
- Lingzhi Zhang
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Compositions of isobutylene, styrene and styrene with graft-on pend...
- Patent number 10,752,722
- Issue date Aug 25, 2020
- ExxonMobil Chemical Patents Inc.
- Andy H. Tsou
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Modifier for polycarbonate and method for producing same
- Patent number 10,723,826
- Issue date Jul 28, 2020
- Nippon A & L Inc.
- Taisuke Yukawa
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Adhesion promoting and/or dust suppression coating
- Patent number 10,703,927
- Issue date Jul 7, 2020
- 3M Innovative Properties Company
- Mahfuza B. Ali
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Graft copolymer and thermoplastic resin composition
- Patent number 10,538,611
- Issue date Jan 21, 2020
- Nippon A & L Inc.
- Kazuhiro Ishigaki
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Graft copolymer and thermoplastic resin composition
- Patent number 10,508,167
- Issue date Dec 17, 2019
- Nippon A & L Inc.
- Kazuhiro Ishigaki
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
UV-absorbing polymers and formulations thereof
- Patent number 10,407,528
- Issue date Sep 10, 2019
- ISP Investments LLC
- Krishnamurthy Nacharaju
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Graft-modified propylene α-olefin copolymers and methods for produc...
- Patent number 10,377,845
- Issue date Aug 13, 2019
- Mitsui Chemicals, Inc.
- Koya Yoshimoto
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Encapsulation film
- Patent number 10,355,239
- Issue date Jul 16, 2019
- LG Chem, Ltd.
- Hyun Jee Yoo
- B32 - LAYERED PRODUCTS
Information Patent Grant
Polyisobutylene-based thermoplastic elastomers
- Patent number 10,280,130
- Issue date May 7, 2019
- The University of Akron
- Joseph P. Kennedy
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Coating agent, decorative film, and article
- Patent number 10,184,072
- Issue date Jan 22, 2019
- Mitsui Chemicals, Inc.
- Yoshihito Hirota
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Graft copolymer and thermoplastic resin composition
- Patent number 10,118,982
- Issue date Nov 6, 2018
- Nippon A & L Inc.
- Kazuhiro Ishigaki
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for modifying polymers
- Patent number 10,093,762
- Issue date Oct 9, 2018
- AKZO NOBEL CHEMICALS INTERNATIONAL B.V.
- Waldo Joseph Elisabeth Beek
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Modified propylene-(α-olefin) copolymer, method for producing same,...
- Patent number 10,072,116
- Issue date Sep 11, 2018
- Mitsui Chemicals, Inc.
- Kuniaki Kawabe
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Photocurable elastomer composition, gasket for hard disk drive, and...
- Patent number 9,982,124
- Issue date May 29, 2018
- Bridgestone Corporation
- Toshihiko Kurata
- G11 - INFORMATION STORAGE
Information Patent Grant
UV-absorbing polymers and formulations thereof
- Patent number 9,920,152
- Issue date Mar 20, 2018
- ISP Investments LLC
- Krishnamurthy Nacharaju
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Rubber composition having good wet-traction properties and a low ar...
- Patent number 9,752,020
- Issue date Sep 5, 2017
- Bridgestone Corporation
- Xiaorong Wang
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Disentangled ultra high molecular weight polyethylene graft co-poly...
- Patent number 9,574,040
- Issue date Feb 21, 2017
- Reliance Industries Limited
- Satya Srinivasa Rao Gandham
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
UV-absorbing polymers and formulations thereof
- Patent number 9,540,474
- Issue date Jan 10, 2017
- ISP Investments LLC
- Krishnamurthy Nacharaju
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Photocurable elastomer composition, seal material, gasket for hard...
- Patent number 9,388,267
- Issue date Jul 12, 2016
- Bridgestone Corporation
- Toshihiko Kurata
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Process for continuous production of halogen-free thermoplastic ela...
- Patent number 9,371,443
- Issue date Jun 21, 2016
- ARLANXEO Singapore Pte. Ltd.
- Conrad Siegers
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Coating agent, decorative film and article
- Patent number 9,365,737
- Issue date Jun 14, 2016
- Mitsui Chemicals, Inc.
- Yoshihito Hirota
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...

Patents Applicationslast 30 patents

Information Patent Application
FREE-RADICALLY POLYMERIZABLE COPOLYMER, FREE-RADICALLY POLYMERIZABL...
- Publication number 20240287233
- Publication date Aug 29, 2024
- 3M Innovative Properties Company
- Claire Hartmann-Thompson
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
SINGLE ION CONDUCTING POLYMERS AND METHOD OF MAKING SAME
- Publication number 20230416438
- Publication date Dec 28, 2023
- Blue Solutions Canada Inc.
- Qiujie ZHAO
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
COMPOSITION COMPRISING STYRENE ISOBUTYLENE BLOCK COPOLYMER AND ETHY...
- Publication number 20230151133
- Publication date May 18, 2023
- 3M Innovative Properties Company
- Vasav Sahni
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
POLYAMIDE RESIN COMPOSITION
- Publication number 20220380540
- Publication date Dec 1, 2022
- Ube Industries, Ltd.
- Kazutoshi TSUBOI
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Application
MODIFIED POLYOLEFIN RESIN AND DISPERSION COMPOSITION THEREOF
- Publication number 20220282019
- Publication date Sep 8, 2022
- NIPPON PAPER INDUSTRIES CO., LTD
- Ryo KOIKE
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
RESIN COMPOSITION, ADHESIVE MEMBER, AND DISPLAY DEVICE INCLUDING TH...
- Publication number 20220177626
- Publication date Jun 9, 2022
- SAMSUNG DISPLAY CO., LTD.
- Tetsuya FUJIWARA
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
COMPOSITION COMPRISING STYRENE ISOBUTYLENE BLOCK COPOLYMER AND ETHY...
- Publication number 20210292458
- Publication date Sep 23, 2021
- 3M Innovative Properties Company
- Vasav Sahni
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
ORGANIC ELECTRONIC DEVICE INCLUDING ENCAPSULATION LAYER
- Publication number 20210202909
- Publication date Jul 1, 2021
- LG CHEM, LTD.
- Hyun Jee YOO
- B32 - LAYERED PRODUCTS
Information Patent Application
POLYMER COMPOSITION FOR STEREOLITHOGRAPHY
- Publication number 20210130523
- Publication date May 6, 2021
- Sumitomo Rubber Industries, Ltd.
- Mutsuki SUGIMOTO
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
COUPLING AGENT
- Publication number 20210040254
- Publication date Feb 11, 2021
- Borealis AG
- Auli NUMMILA-PAKARINEN
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
Anionic Graft Polymerization Onto an Existing Polymer Chain by Orga...
- Publication number 20200190241
- Publication date Jun 18, 2020
- EXXONMOBIL CHEMICAL PATENTS INC.
- Jason A. Mann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
Product, Composition and Application Thereof, and Automobile Tire I...
- Publication number 20190218384
- Publication date Jul 18, 2019
- China Petroleum and Chemical Corporation
- Yingxin QIU
- B60 - VEHICLES IN GENERAL
Information Patent Application
Compositions of Isobutylene, Styrene and Styrene with Graft-On Pend...
- Publication number 20190023827
- Publication date Jan 24, 2019
- EXXONMOBIL CHEMICAL PATENTS INC.
- Andy H. Tsou
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
MODIFIER FOR POLYCARBONATE AND METHOD FOR PRODUCING SAME
- Publication number 20180273665
- Publication date Sep 27, 2018
- NIPPON A&L INC.
- Taisuke YUKAWA
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
UV-ABSORBING POLYMERS AND FORMULATIONS THEREOF
- Publication number 20180208695
- Publication date Jul 26, 2018
- ISP INVESTMENTS LLC
- Krishnamurthy Nacharaju
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Application
IMPACT-MODIFIED POLYCARBONATE COMPOSITIONS HAVING IMPROVED FLOWABIL...
- Publication number 20180201755
- Publication date Jul 19, 2018
- COVESTRO DEUTSCHLAND AG
- Rolf Wehrmann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESS FOR MODIFYING POLYMERS
- Publication number 20180155480
- Publication date Jun 7, 2018
- Akzo Nobel Chemicals International B.V.
- Waldo Joseph Elisabeth BEEK
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
NOVEL POLYISOBUTYLENE-BASED THERMOPLASTIC ELASTOMERS
- Publication number 20170240493
- Publication date Aug 24, 2017
- The University of Akron
- Joseph P. Kennedy
- C07 - ORGANIC CHEMISTRY
Information Patent Application
UV-ABSORBING POLYMERS AND FORMULATIONS THEREOF
- Publication number 20170114173
- Publication date Apr 27, 2017
- ISP INVESTMENTS LLC
- Krishnamurthy Nacharaju
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Application
GRAFT COPOLYMER AND THERMOPLASTIC RESIN COMPOSITION
- Publication number 20170037175
- Publication date Feb 9, 2017
- NIPPON A&L INC.
- Kazuhiro ISHIGAKI
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
ADHESION PROMOTING AND/OR DUST SUPPRESSION COATING
- Publication number 20170029649
- Publication date Feb 2, 2017
- 3M Innovative Properties Company
- Mahfuza B. Ali
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
GRAFT-MODIFIED PROPYLENE ALPHA-OLEFIN COPOLYMERS AND METHODS FOR PR...
- Publication number 20160355628
- Publication date Dec 8, 2016
- Mitsui Chemicals, Inc.
- Koya YOSHIMOTO
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
MODIFIED PROPYLENE-(a-OLEFIN) COPOLYMER, METHOD FOR PRODUCING SAME,...
- Publication number 20160280828
- Publication date Sep 29, 2016
- Mitsui Chemicals, Inc.
- Kuniaki KAWABE
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
UV-ABSORBING POLYMERS AND FORMULATIONS THEREOF
- Publication number 20160002384
- Publication date Jan 7, 2016
- ISP Investments Inc.
- Krishnamurthy Nacharaju
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
DISENTANGLED ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE GRAFT CO-POLY...
- Publication number 20150240017
- Publication date Aug 27, 2015
- RELIANCE INDUSTRIES LIMITED
- Satya Srinivasa Rao Gandham
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
Novel Polyisobutylene-Based Thermoplastic Elastomers
- Publication number 20150210810
- Publication date Jul 30, 2015
- The University of Akron
- Joseph P. Kennedy
- C07 - ORGANIC CHEMISTRY
Information Patent Application
ENCAPSULATING MATERIAL FOR SOLAR CELL AND SOLAR CELL MODULE
- Publication number 20150013755
- Publication date Jan 15, 2015
- Mitsui Chemicals Tohcello, Inc.
- Shigenobu Ikenaga
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
PROCESS FOR CONTINUOUS PRODUCTION OF HALOGEN-FREE THERMOPLASTIC ELA...
- Publication number 20140228521
- Publication date Aug 14, 2014
- Conrad Siegers
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
THERMOPLASTIC RESIN COMPOSITION FOR REFLECTIVE MATERIAL, REFLECTIVE...
- Publication number 20140167091
- Publication date Jun 19, 2014
- Mitsui Chemicals, Inc.
- Hideto Ogasawara
- G02 - OPTICS
Information Patent Application
METHOD OF PURIFYING BLOCK COPOLYMERS
- Publication number 20130296496
- Publication date Nov 7, 2013
- Judit E. Puskas
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE

on to butene polymers

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Organic electronic device including encapsulation layer

Resin composition, adhesive member, and display device including th...

Modified polyolefin resin and dispersion composition thereof

Anionic graft polymerization onto an existing polymer chain by orga...

Composition comprising styrene isobutylene block copolymer and ethy...

Latex of acid-modified conjugated diene-based polymer, and method f...

Polymer composition for stereolithography

Product, composition and application thereof, and automobile tire i...

Multi-functionally modified polymer binder for lithium ion batterie...

Compositions of isobutylene, styrene and styrene with graft-on pend...

Modifier for polycarbonate and method for producing same

Adhesion promoting and/or dust suppression coating

Graft copolymer and thermoplastic resin composition

Graft copolymer and thermoplastic resin composition

UV-absorbing polymers and formulations thereof

Graft-modified propylene α-olefin copolymers and methods for produc...

Encapsulation film

Polyisobutylene-based thermoplastic elastomers

Coating agent, decorative film, and article

Graft copolymer and thermoplastic resin composition

Process for modifying polymers

Modified propylene-(α-olefin) copolymer, method for producing same,...

Photocurable elastomer composition, gasket for hard disk drive, and...

UV-absorbing polymers and formulations thereof

Rubber composition having good wet-traction properties and a low ar...

Disentangled ultra high molecular weight polyethylene graft co-poly...

UV-absorbing polymers and formulations thereof

Photocurable elastomer composition, seal material, gasket for hard...

Process for continuous production of halogen-free thermoplastic ela...

Coating agent, decorative film and article

Patents Applicationslast 30 patents

FREE-RADICALLY POLYMERIZABLE COPOLYMER, FREE-RADICALLY POLYMERIZABL...

SINGLE ION CONDUCTING POLYMERS AND METHOD OF MAKING SAME

COMPOSITION COMPRISING STYRENE ISOBUTYLENE BLOCK COPOLYMER AND ETHY...

POLYAMIDE RESIN COMPOSITION

MODIFIED POLYOLEFIN RESIN AND DISPERSION COMPOSITION THEREOF

RESIN COMPOSITION, ADHESIVE MEMBER, AND DISPLAY DEVICE INCLUDING TH...

COMPOSITION COMPRISING STYRENE ISOBUTYLENE BLOCK COPOLYMER AND ETHY...

ORGANIC ELECTRONIC DEVICE INCLUDING ENCAPSULATION LAYER

POLYMER COMPOSITION FOR STEREOLITHOGRAPHY

COUPLING AGENT

Anionic Graft Polymerization Onto an Existing Polymer Chain by Orga...

Product, Composition and Application Thereof, and Automobile Tire I...

Compositions of Isobutylene, Styrene and Styrene with Graft-On Pend...

MODIFIER FOR POLYCARBONATE AND METHOD FOR PRODUCING SAME

UV-ABSORBING POLYMERS AND FORMULATIONS THEREOF

IMPACT-MODIFIED POLYCARBONATE COMPOSITIONS HAVING IMPROVED FLOWABIL...

PROCESS FOR MODIFYING POLYMERS

NOVEL POLYISOBUTYLENE-BASED THERMOPLASTIC ELASTOMERS

UV-ABSORBING POLYMERS AND FORMULATIONS THEREOF

GRAFT COPOLYMER AND THERMOPLASTIC RESIN COMPOSITION

ADHESION PROMOTING AND/OR DUST SUPPRESSION COATING

GRAFT-MODIFIED PROPYLENE ALPHA-OLEFIN COPOLYMERS AND METHODS FOR PR...

MODIFIED PROPYLENE-(a-OLEFIN) COPOLYMER, METHOD FOR PRODUCING SAME,...

UV-ABSORBING POLYMERS AND FORMULATIONS THEREOF

DISENTANGLED ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE GRAFT CO-POLY...

Novel Polyisobutylene-Based Thermoplastic Elastomers

ENCAPSULATING MATERIAL FOR SOLAR CELL AND SOLAR CELL MODULE

PROCESS FOR CONTINUOUS PRODUCTION OF HALOGEN-FREE THERMOPLASTIC ELA...

THERMOPLASTIC RESIN COMPOSITION FOR REFLECTIVE MATERIAL, REFLECTIVE...

METHOD OF PURIFYING BLOCK COPOLYMERS