发明名称 |
HYDROGENATED STYRENE POLYMER, PROCESS FOR PRODUCING THE SAME, AND MOLDED OBJECT OBTAINED THEREFROM |
摘要 |
The present invention relates to a hydrogenated styrene polymer that has excellent transparency, can be used suitably for an optical application such as an optical disk substrate, has stability and transparency in a hot and humid environment, and has excellent heat resistance; and a process for producing same; etc. The hydrogenated styrene polymer of the present invention has a hydrogenated polymerized styrene unit content of at least 70 wt %, a content of fine particulate foreign matter having a particle size of 0.2 mu m or more and less than 0.5 mu m of at most 1 x 10<6> per g of the hydrogenated styrene polymer, and a phosphorus atom content of at most 0.01 parts by weight in 100 parts by weight of the hydrogenated styrene polymer. Furthermore, the process for producing a hydrogenated styrene polymer of the present invention includes steps of filtering, with a filter having a pore size of 0.3 mu m or less, a hydrogenated styrene polymer having a hydrogenated polymerized styrene unit content of at least 70 wt %, at a temperature at which the solution viscosity thereof is at most 10 Pa.sec (100 poise) at a shear rate of 1 (1/s), and then removing a solvent from the filtrate thus obtained. |
申请公布号 |
EP1369437(A4) |
申请公布日期 |
2005.01.12 |
申请号 |
EP20020710300 |
申请日期 |
2002.01.16 |
申请人 |
TEIJIN LIMITED;BAYER MATERIALSCIENCE AG |
发明人 |
HASHIZUME, KIYONARI;KIDO, NOBUAKI;MATSUMURA, SHUNICHI;SASAKI, TAKESHI |
分类号 |
C08F8/04;G11B7/2533;(IPC1-7):C08F8/04;G11B7/24 |
主分类号 |
C08F8/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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