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環(huán)烯烴共聚物COC 日本JSR G7810
環(huán)烯烴共聚物（COC）的是一種非晶態(tài)的高分子聚合物，只有幾個別制造商生產(chǎn)。COC是一個相對較新級別的聚合物，與聚丙烯和聚乙烯相比。這種材料主要用于要求玻璃般清晰產(chǎn)品，包括鏡頭，小瓶，顯示器和醫(yī)療設(shè)備。
環(huán)烯烴共聚物的自然形態(tài)，類似玻璃。典型環(huán)烯烴共聚物材料，比高密度聚乙烯和聚丙烯模量較高。由于其化學(xué)，模量越高，就越變得脆。環(huán)烯烴共聚物也是一個防潮濕的，低吸水率的高透明聚合物。在醫(yī)療應(yīng)用領(lǐng)域，環(huán)烯烴共聚物是一個低萃取物純度高的產(chǎn)品。環(huán)烯烴共聚物也是一個無鹵素產(chǎn)品。
醫(yī)用級高透明高耐溫COC
TOPAS 是Topas Advanced Polymers GmbH公司開發(fā)出來的環(huán)烯烴類共聚物（COC）的商品名，是具有環(huán)狀烯烴結(jié)構(gòu)的非晶性高透明共聚高分子。TOPAS COC 樹脂是一種基于獨(dú)創(chuàng)的茂金屬催化技術(shù)的高品質(zhì)和高純度非晶性環(huán)狀樹脂。在標(biāo)準(zhǔn)要求很嚴(yán)的醫(yī)療器械裝置和檢查診斷器具等醫(yī)療領(lǐng)域，作為高品質(zhì)和高成本的石英玻璃和 PDMS（polydimethylsiloxane）等的替代材料，TOPAS COC具有最佳特性和性價比。
Cyclic Olefin Copolymer (COC) is an amorphous polymer made by several polymer manufacturers. COC is a relatively new class of polymers when compared to polypropylene and polyethylene. This material is primarily used in applications requiring glass-like clarity including lenses, vials, monitors, and medical devices.
COC has a transparency similar to glass in its natural form. Typical COC material will have a higher modulus than HDPE and PP. Due to its chemistry, the higher the modulus, the more brittle it becomes. COC also has a high moisture barrier for a clear polymer along with a low absorption rate. In medical applications, COC is noted to be a high purity product with low extractables. COC is also a halogen-free product.
Some properties will vary due to monomer content. These include glass transition temperature, viscosity, and stiffness. The glass transition temperature of these polymers can exceed 150 °C
Extrusion
COC can be extruded with both cast and blown film equipment. These films are then used in consumer applications including food and pharmaceutical packaging. Commercial structures of COC used in blister packs are typically coextruded with a thick COC core and thin polypropylene skin layers. PVC and PvDC can also be placed on the skins via lamination. Profile extrusion is another method that can be used to make COC reinforced tubes or pipes.
Molding
While there are many different types of molding, COC is primarily used in injection molding. Its natural clarity makes it useful in lenses for cameras, projectors and copiers. COC has little to no extractables which make it useful in diagnostic and medical devices. Most COC grades can also undergo sterilization by gamma radiation, steam and ethylene oxide.
Fiber Spinning
COC has unique electrical properties that resist dielectric breakdown and have a very low dielectric loss over time. Because of this COC is used in filter media that require a charge retention to work properly
