| 摘要 |
<p>A novel alicyclic hydrocarbon copolymer having a weight average molecular weight (Mw) of 1,000 - 1,000,000 and comprising repeating units (a) having an alicyclic structure and repeating units (b) having a chainlike structure; the sum of repeating units (a) and repeating units (b) being at least 90 wt.% based on the copolymer, and the content of repeating units (b) being at least 1 wt.% but smaller than 10 wt.%, based on the copolymer; and the chain of repeating units (a) satisfying the formula: A </= 0.3 x B where A = weight average molecular weight of the chain of repeating units (a), and B = Mw of the copolymer x (number of repeating units (a)/number of the total repeating units constituting the copolymer). The copolymer exhibits low birefringence and high mechanical strength. A process for producing the copolymer is provided.</p> |
