| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a poly(vinylacetal) resin having a high glass transition point, excellent in heat resistance and waterproof property and showing less optical distortion formed on molding as compared with those of conventional poly(vinylacetal) resins. <P>SOLUTION: This poly(vinylacetal) resin contains a highly bulky group represented by a norbornan backbone such as bicyclo[2.2.1]heptyl group, etc., or a tetrahydrocyclopentadiene backbone such as tricyclo[4.3.1.0<SP>1.6</SP>]decyl group, etc. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
