申请人:NIPPON ZEON CO., LTD.
公开号:EP0784066A1
公开(公告)日:1997-07-16
A thermoplastic norbornene resin having a number-average molecular weight (Mn) of 12,000 or more in terms of polyisoprene value measured by gel permeation chromatography and excellent in low birefringence property and resistance to deterioration with greases and oils is obtained by ring-opening polymerizing a polycyclic norbornene monomer containing at least 70% by weight of a norbornene monomer represented by the following formula I (for example, 1,4-methano-1,4,4a,9a-tetrahydrofluorene):
(wherein the lower 6-membered ring structure may have a double bond) and hydrogenating the polymer so that the hydrogenation rate of double bond in the main chain is at least 98% and the hydrogenation rate of the 6-membered ring structure is at least 90%.
一种热塑性降冰片烯树脂,用凝胶渗透色谱法测定其平均分子量(Mn)为 12、一种热塑性降冰片烯树脂,其通过凝胶渗透色谱法测量的聚异戊二烯值的数均分子量(Mn)为 12,000 或以上,并具有优异的低双折射特性和抗油脂劣化性能,其方法是将含有至少 70%(重量)由下式 I 代表的降冰片烯单体(例如,1,4-甲桥-1,4,4a,9a-四氢芴)的多环降冰片烯单体开环聚合:
(其中下部 6 元环结构可能有一个双键),并对聚合物进行氢化,使主链中双键的氢化率至少为 98%,6 元环结构的氢化率至少为 90%。