Cycloolefin copolymers COC

Table 9 compares the most important properties of substrate materials based on BPA-PC, PMMA, and CPO (three different products) (216,217). The future will prove if the current disadvantages of CPO against BPA-PC regarding warp, processibiUty (melt viscosity), and especially cost can be alleviated. CycHc polyolefins (CPO) and, especially cycloolefin copolymers (COC) (218) and blends of cycloolefin copolymers with suitable engineering plastics have the potential to be interesting materials for substrate disks for optical data storage. 

High magnetic fields and in particular C-NMR spectroscopy allow the analysis of even longer configurational sequences (tetrads up to nonads). This proved to be important in particular for the analysis of polyolefins like polypropylene or cycloolefin copolymers (COC). These polymers are available via transition-metal mediated (Ziegler-Natta, metallocene) insertion polymerizations, and the configurational analysis provides deep insight into the respective polymerization mechanisms as well as into the structure-property relationships. 

M. Donner and W. Kaminsky, Chemical recycling of cycloolefin-copolymers (COC) in a fluidized-bed reactor, /. Anal. Appl. Pyrolysis, 74 (l-2) 238-244, August 2005. 

Cyclic Polyolefins (CPO) and Cycloolefin Copolymers (COC). Japanese and European companies are developing amorphous cyclic polyolefins as substrate materials for optical data storage (213—217). The materials are based on dicyclopentadiene and/or tetracyclododecene (10), where R = H, alkyl, or COOCH3. Products are formed by Ziegler-Natta polymerization with addition of ethylene or propylene (11) or so-called metathesis polymerization and hydrogenation (12), (101,216). These products may still contain about 10% of the dicyclic structure (216). 

Single-site metallocene catalysts are also highly reactive vis-a-vis cycloolefins such as cyclobutene, cyclopentene or norbornene. While homopolymers of these cycloolefins have melting temperatures (>380°C), much too high for technical processability, ethylene-cycloolefin copolymers (COC s) - e.g. ethylene-norbornene copolymers - are amorphous materials with glass transition temperatures, above which they become soft and processable [W. Kaminsky, J. Polym. Sci. A, Polym. Chem., 2004, 42, 3911]. 

Within the past five years, commercial interest in metallocene catalyst components for the polymerization of olefins has increased enormously. Commercial production of a rising number of polyolefin types from different companies is creating a burgeoning and highly diversified demand for metallocenes. New brand names (e. g., Metocene (Basell), Elite (Dow Chemical), Engage (DuPont), Exact (ExxonMobil), Luflexen (Basell), Apel (Mitsui Chemicals), Borecene (Borealis), Finathene (TotalFinaElf), Topas (Ticona), just to name a few) characterize polyolefins such as PE, elastomers, PP, cycloolefin copolymers (COCs) and PS from metallocene-type catalysts [1-3]. 

Cycloolefin copolymer (COC) is an amorphous, clear metallocene product of norbomene and ethylene with a spectrum of attractive performance characteristics. Thus, COC (MFI at 190 °C and 2.16 kg = 1.7 dg min, p = 1,020 kg m ) was blended with C2+6 LLDPE (MFI at 190 °C and 2.16 kg = 3.2 dg min , p = 920 kg m ). The mechanical properties of the blends indicate immiscibility, despite the increased LLDPE crystallinity. The presence of COC improved the thermo-oxidative stability. Quasi-static tensile tests showed that increasing fraction of COC in the blends accounts for an enhancement of the elastic modulus and a decrease in the strain at break, while tensile strength passes through a minimum. A significant reduction of the creep compliance of LLDPE could be achieved only for the COC fractions exceeding 20 wt% (Dorigato et al. 2010). 

Kaminsky and Spiehl incorporated up to 10 mol% of cyclopentene monomeric units into cycloolefin copolymers (COC)... 

Poly(ethylene-co-vinylacetate) EVA, Polyethylene ionomer EIM, Cycloolefine copolymer COC [Poly(ethylene-co-norbornene)], Poly(ethylene-co-acrylic acid) EAA Polyolefines III... 

Cycloolefine copolymer, COC. Applications precision optics, optical storage media, lenses, medical and labware applications. 

Polynorbornene (PNB) homopolymers of industrial interest are not processible owing to their high TtaS and insolubility in common organic solvents. By copolymerization of norbornene with ethylene, a cycloolefin copolymer (COC) can be produced. These new materials have been the focus of academic and industrial research. Ethylene/norbornene (E/NB) copolymers are usually amorphous and show an excellent transparency and high refractive index, making them suitable for optical applications. ... 

Copolymerization of these cyclic olefins with ethylene or a-olefins cycloolefin copolymers (COC) can be produced, representing a new class of thermoplastic amorphous materials [217-220]. Early attempts to produce such copolymers were made using heterogeneous TiCl4/VAlEt2Cl or vanadium catalysts, but first significant progress was... 

By the copolymerization of cyclic olefins such as cyclopentene or norbomene with ethene and other a-olefins, it is possible to obtain cycloolefin copolymers (COC) representing a new class of thermoplastic, amorphous materials [89, 103]. 

Sabbert, D., Landsiedel, J., Bauer, H.-D., and Ehrfeld, W. (1999) ArF-exdmer laser ablation experiments on cycloolefin copolymer (COC). Appl. Surf. Sci., 150, 185-189. 

Table3.3-4 Poly(ethylene-co-vinyl acetate), EVA polyethylene ionomer, EIM cycloolefine copolymer, COC (poly-(ethylene-co-norbomene)) poly(ethylene-co-acrylic acid), EAA...

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