| abstract |
A hydrogenated product of an aromatic vinyl polymer,nwherein the hydrogenation rate of the aromatic ringsnthereof is at least 97%, a ratio (Mw/Mn) of the weightnaverage molecular weight (Mw) to the number averagenmolecular weight (Mn) is at most 2.0, the weight averagenmolecular weight (Mw) is 100,000 to 300,000, and thencontent of a component having a molecular weight (M) of atnmost 10,000 is at most 2% by weight based on the totalnweight of the polymer; a hydrogenated product of annaromatic vinyl polymer, wherein the content of foreignnmatter having a particle diameter of at least 0.5 µm in thenhydrogenated polymer is at most 3.0 x 10 4 particles/g; andna substrate for information recording media obtained bynmolding a resin material containing a hydrogenated productnof an aromatic vinyl polymer, wherein the hydrogenationnrate of the aromatic rings thereof is at least 97%, a ration(Mw/Mn) of the weight average molecular weight (Mw) to thennumber average molecular weight (Mn) is at most 2.0, andnthe weight average molecular weight (Mw) is 100,000 ton300,000, and production process thereof. |