| 摘要 |
<p>A process for preparing a copolymer suitable for use in an optical element which comprises the step of radically-polymerizing a composition which comprises at least one first monomer represented by formula (I), at least one second monomer represented by any one of formulas (II, III and IV), and 0.005 to 1.0 weight percent of said polymerizable composition of an organic chain transfer agent having a chain transfer coefficient at 50-60 °C of greater than 0.5 with acrylic monomer or styrenic monomer; in the presence of a radical polymerization initiator, is disclosed. Also disclosed is a copolymer suitable for use as an optical element obtained by the foregoing process and an optical element comprising this copolymer. The process of the disclosure provides essentially striation-free polymers which can be used to fabricate optical elements including thick lenses for glasses.</p> |
