US Patent No: 5,462,995
Number of patents in Portfolio can not be more than 2000
Hydrogenated products of thermoplastic norbornene polymers, their production, substrates for optical elements obtained by molding them, optical elements and lenses
Stats
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Oct 31, 1995
Issued date -
Nov 16, 1993
filing date -
08/146,101
serial no -
In Force
status
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Abstract
The present invention provides the hydrogenated product of a thermoplastic norbornene polymer excellent in characteristics as optical materials by reducing the residual amounts of the transition metal atoms originating from the polymerization catalyst used at the polymerization to 1 ppm or less of the hydrogenated product. Reduction of the residual amounts to below the desired level is attained by treating the reaction solution with the adsorbent during or after production of the hydrogenated product from the thermoplastic norbornene polymer. The hydrogenated product of the thermoplastic norbornene polymer thus obtained in which the residual amounts of the transition metal atoms are 1 ppm or less, has a wide utilization field, including a material for optical articles having excellent utilization characteristics such as substrates for optical elements, lenses and the like.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,053,471 Transparent resin material | 14 | 1990 | |
| 5,202,388 Process for producing hydrogenation product of ring-opening polymer | 6 | 1991 | |
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| 5,276,098 Thermoplastic saturated norbornene group polymer composition | 6 | 1992 | |
| 5,334,424 Thermoplastic norbornene resin formed articles and sustrates for liquid crystal display | 21 | 1992 | |
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| 5,290,877 Information recording medium and adhesive composition therefor | 7 | 1992 | |
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| 5,240,998 Thermoplastic compositions based on a vinyl aromatic co-polymer and a polyamide resin | 2 | 1990 | |
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| 5,115,041 Substrate for optical recording media and molding composition therefor | 8 | 1989 | |
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| 5,244,706 Optical recording disk | 9 | 1992 | |
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| 4,876,525 Emergency warning brake system | 11 | 1988 | |