Treatise on Epdm

Ravishankar, P.S.

doi:10.5254/rct.12.87993

Cited by 65 publications

(36 citation statements)

References 8 publications

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“…Bimodal polymers can provide the best balance of performance versus processing. They are usually prepared by reactor blending techniques or the use of catalyst mixtures …”

Section: Product Differentiationmentioning

confidence: 99%

“…In addition, a larger variety of different polyolefin types could be obtained. Moreover, the well‐defined molecular structure of metallocene catalysts allowed for in‐depth scientific studies, which have resulted in a better fundamental understanding of insertion polymerization …”

Section: Introductionmentioning

confidence: 99%

“…Out of the numerous types of polyolefins, EP(D)M elastomers are of great practical importance when superior elastomeric properties are required . EP(D)M is a random terpolymer of ethylene, propylene and a nonconjugated diene, that is, 5‐ethylene‐2‐norbornene (ENB) or dicyclopentadiene (DCPD) (Scheme ).…”

Section: Introductionmentioning

confidence: 99%

“…The diene is incorporated to enable sulfur vulcanization and to enhance the peroxide curing efficiency . EPDM has good elastic and mechanical properties, excellent resistance to heat, oxygen, and ozone, excellent resistance against polar solvents and aqueous media and, last but not least, the ability to incorporate very large amounts of fillers and oil plasticizer, resulting in low‐cost rubber compounds . As a result, EPDM is the largest volume, nontire elastomer, applied in automotive sealing systems, roof sheeting, seals and tubes in contact with aqueous systems and polar solvents and for wire and cable insulation.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the low reactivity and limited M w capability of conventional vanadium catalysts at elevated reactor temperatures, metallocene (metal center sandwiched by two cyclopentadienyl ligands), and postmetallocene (metal center with no or just one cyclopentadienyl ligand) catalysts for polyolefin and EP(D)M polymerization (Scheme ) were developed in the early 1990s by several groups in both academia and industry …”

Section: Introductionmentioning

confidence: 99%

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On the Development of Titanium κ¹‐Amidinate Complexes, Commercialized as Keltan ACE™ Technology, Enabling the Production of an Unprecedented Large Variety of EPDM Polymer Structures

Doremaele

Duin²,

Valla³

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

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ARLANXEO Elastomers has developed and commercialized Keltan ACE TM technology, a class of half-sandwich cyclopentadienyl j 1 -amidinate metal complexes, which are extremely active for the production of first-class ethylene/propylene/diene copolymers (EPDM). In this review, the development and some of the key features of the Keltan ACE TM catalyst system are presented. Many different ACE catalysts have been synthesized over the past years, including bridged and bimetallic catalysts. With Keltan ACE TM , a complete range of EPDM products with similar polymer characteristics as their Ziegler-Natta (ZN) counterparts can be produced, including variations containing very high 5-ethylidene-2-norbornene (ENB) contents, controlled long chain branching, very high molecular weight, as well as oil-extended products. Moreover, other EPDM structures can be polymerized. The Keltan ACE TM catalyst technology also allows the production of EPDMs with very high amounts of dicyclopentadiene (DCPD) or 5-vinyl 2-norbornene (VNB) without excessive gelation and reactor fouling, that is, products that cannot or are extremely difficult to obtain via classical ZN catalysis. In a next step, high-VNB-EPDM can be postreactor modified, for example, via metathesis chemistry. In addition, EPDM polymers with a very broad or even bimodal molecular weight distribution can be obtained in a single reactor with certain ACE catalyst structures at particular activator/precatalyst ratios. V C 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 2877-2891 KEYWORDS: catalysts; EPDM; Keltan ACE Technology; polyolefins; post metallocene; product diversification; rubber INTRODUCTION The early 1950s can be considered as the start of the polyolefin age. Since then, the production and consumption of olefin-based polymeric materials have been steadily increasing to high volumes. Intense catalyst and product development has resulted in a wide range of different types of polyolefins each with designed properties and applications.

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“…Bimodal polymers can provide the best balance of performance versus processing. They are usually prepared by reactor blending techniques or the use of catalyst mixtures …”

Section: Product Differentiationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the Development of Titanium κ¹‐Amidinate Complexes, Commercialized as Keltan ACE™ Technology, Enabling the Production of an Unprecedented Large Variety of EPDM Polymer Structures

Doremaele

Duin²,

Valla³

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

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A model for the devolatilization of EPDM rubber in a series of steam stripping vessels

et al. 2014

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A mathematical model was developed for the multitank stripping section of industrial ethylene propylene diene monomer (EPDM) rubber processes. Experiments were conducted to determine Henry's law coefficients and diffusivities for hexane solvent and 5-ethylidene-2-norbornene (ENB) comonomer in EPDM particles. Equivalent radii for diffusion within the particles were also determined. A model was developed to predict solvent and comonomer concentrations in a single particle as it moves through a series of tanks with different operating conditions. A second, more-complicated model was then developed to account for a continuous flow stirred tank residence time distribution for the particles in the tanks. Data from three industrial plants were used to estimate parameters and assess the models' predictive ability. Typical prediction errors are 0.90 wt % for residual hexane and 0.14 wt % for residual ENB.

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Binuclear Ti(IV) complex with new compartmental ligand 2,6‐(bis‐CF₃‐carbinol)‐4‐tert‐butylphenol as precatalysts for ethylene polymerization and its copolymerization with propylene and 5‐ethylidene‐norbornene

Тuskaev

Гагиева

Bogdanov

et al. 2021

Applied Organom Chemis

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The coordination chemistry of a new compartmental ligand 2,6‐(bis‐CF3‐carbinol)‐4‐tert‐butylphenol with Ti(IV) and Zr(IV) has been studied. The structures of Al, Ti, and Zr complexes with the participation of this ligand were established by X‐ray diffraction. Upon activation with Et2AlCl or Et3Al2Cl3 and Bu2Mg, Ti(IV) complex exhibited moderate catalytic activity for ethylene polymerization. The obtained UHMWPE samples were processed into high‐strength (up to 2.7 GPa) and high‐modulus (up to 162 GPa) films through solid‐phase molding and orientation drawing. The mononuclear and binuclear Ti(IV) complexes catalyzed the ternary copolymerization of ethylene, propylene, and 5‐ethylidene‐norbornene. Tercopolymers with a content of propylene units up to 36 mol% and 5‐EBN up to 8.6 mol% were synthesized with a high activity (2.8–6.3 tons of copolymer/mol Ti h); the mechanical characteristics of elastomeric materials have been studied.

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Treatise on Epdm

Cited by 65 publications

References 8 publications

On the Development of Titanium κ¹‐Amidinate Complexes, Commercialized as Keltan ACE™ Technology, Enabling the Production of an Unprecedented Large Variety of EPDM Polymer Structures

On the Development of Titanium κ¹‐Amidinate Complexes, Commercialized as Keltan ACE™ Technology, Enabling the Production of an Unprecedented Large Variety of EPDM Polymer Structures

A model for the devolatilization of EPDM rubber in a series of steam stripping vessels

Binuclear Ti(IV) complex with new compartmental ligand 2,6‐(bis‐CF₃‐carbinol)‐4‐tert‐butylphenol as precatalysts for ethylene polymerization and its copolymerization with propylene and 5‐ethylidene‐norbornene

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Treatise on Epdm

Cited by 65 publications

References 8 publications

On the Development of Titanium κ1‐Amidinate Complexes, Commercialized as Keltan ACE™ Technology, Enabling the Production of an Unprecedented Large Variety of EPDM Polymer Structures

On the Development of Titanium κ1‐Amidinate Complexes, Commercialized as Keltan ACE™ Technology, Enabling the Production of an Unprecedented Large Variety of EPDM Polymer Structures

A model for the devolatilization of EPDM rubber in a series of steam stripping vessels

Binuclear Ti(IV) complex with new compartmental ligand 2,6‐(bis‐CF3‐carbinol)‐4‐tert‐butylphenol as precatalysts for ethylene polymerization and its copolymerization with propylene and 5‐ethylidene‐norbornene

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Product

Resources

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On the Development of Titanium κ¹‐Amidinate Complexes, Commercialized as Keltan ACE™ Technology, Enabling the Production of an Unprecedented Large Variety of EPDM Polymer Structures

On the Development of Titanium κ¹‐Amidinate Complexes, Commercialized as Keltan ACE™ Technology, Enabling the Production of an Unprecedented Large Variety of EPDM Polymer Structures

Binuclear Ti(IV) complex with new compartmental ligand 2,6‐(bis‐CF₃‐carbinol)‐4‐tert‐butylphenol as precatalysts for ethylene polymerization and its copolymerization with propylene and 5‐ethylidene‐norbornene