Cycloolefin copolymers
Structural formula | |||||||
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General | |||||||
Surname | Cycloolefin copolymers | ||||||
other names |
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CAS number | 26007-43-2 | ||||||
Brief description |
colorless and odorless solid |
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properties | |||||||
solubility |
practically insoluble in water |
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safety instructions | |||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Cycloolefin copolymers ( COC ) are a class of engineering polymers .
synthesis
Cycloolefin copolymers are obtained by metallocene- catalyzed copolymerization of cycloolefins (such as norbornene ) with alk-1-enes (such as ethene ).
properties
Although they only consist of olefins , COC are amorphous and therefore transparent, in contrast to semi-crystalline polyolefins such as polyethylene and polypropylene . The properties of COC can be changed over a wide range by changing the installation ratios of cyclic and linear olefins. This essentially sets the heat resistance in a range from 65 to 190 ° C.
All COCs have a number of properties in common, such as good thermoplastic flowability , high rigidity , strength and hardness as well as low density and high transparency with good acid and alkali resistance.
use
The low birefringence is of interest for optical applications . In the field of medicine / diagnostics, the excellent biocompatibility , especially blood compatibility, and the extremely low water absorption / water vapor permeability should be emphasized.
Commercial applications of COCs are therefore various optical functional films in flat screens as well as lenses and sensors . In medicine / diagnostics, prefilled syringes, microtiter plates , cuvettes and vials are used. COCs are also used as blister packaging and shrink or twist film .
Individual evidence
- ↑ a b Topas® Cyclic Olefin Copolymers
- ↑ a b Cyclic olefin copolymer data sheet , United States Pharmacopeia (USP) Reference Standard from Sigma-Aldrich , accessed on July 19, 2017 ( PDF ).
- ↑ Entry on cycloolefin copolymers. In: Römpp Online . Georg Thieme Verlag, accessed on March 27, 2015.
- ↑ Ju Young Shin, Jl Yong Park, Chenyang Liu, Jiasong He, Sung Chul Kim: Chemical Structure and Physical Properties of Cyclic Olefin Copolymers (IUPAC Technical Report). (PDF, 0.67 MB) In: Pure Appl. Chem. , Vol. 77, no. 05. IUPAC , 2005, pp. 801-814 , accessed on April 12, 2010 (English).
- ↑ patent WO2009041448 : White Film and Surface Light Sources with the Same. Applied September 25, 2008 , published April 2, 2009 , Applicants: Toray Industries Inc., Aoyama Shigeru, Kikuchi Akikazu, Takahashi Kozo, Inventors: Aoyama Shigeru, Kikuchi Akikazu, Takahashi Kozo (see section 0177).