| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide optical elements composed of flame-resistant plastics. <P>SOLUTION: The optical elements are optical elements for applications in regions with stringent fire safety regulations, whose color rendering index R<SB>a</SB>is at least 97 at a thickness of 4 mm, and which are flame-retardant according to DIN 60332 and are mainly composed of a plastic having at least one structural element selected from the group comprising sulfones, sulfides, ethers, esters, ketones and imides. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
