Hydrogenated polymers, resin composition, and process for producing substrate for information-recording medium
US6433102B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2001 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Sep 4, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/24304
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hydrogenated product of an aromatic vinyl polymer, wherein the hydrogenation rate of the aromatic rings thereof is at least 97%, a ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is at most 2.0, the weight average molecular weight (Mw) is 100,000 to 300,000, and the content of a component having a molecular weight (M) of at most 10,000 is at most 2% by weight based on the total weight of the polymer; a hydrogenated product of an aromatic vinyl polymer, wherein the content of foreign matter having a particle diameter of at least 0.5 &mgr;m in the hydrogenated polymer is at most 3.0×104 particles/g; and a substrate for information recording media obtained by molding a resin material containing a hydrogenated product of an aromatic vinyl polymer, wherein the hydrogenation rate of the aromatic rings thereof is at least 97%, a :ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is at most 2.0, and the weight average molecular weight (Mw) is 100,000 to 300,000, and production process thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.