Hydrogenated products of thermoplastic norbornene polymers, their production, substrates for optical elements obtained by molding them, optical elements and lenses

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5462995
SERIAL NO

08146101

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
NIPPON ZEON CO., LTD.TOKYO149

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hosaka, Tohru Yokohama, JP 7 162
Kohara, Teiji Kawasaki, JP 51 606
Koushima, Yuji Yokohama, JP 3 67
Mizuno, Hideharu Yokohama, JP 2 102
Natsuume, Tadao Yokosuka, JP 44 611

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 4876525 Emergency warning brake system 12 1988
 
NIPPON ZEON CO., LTD. (2)
* 5276098 Thermoplastic saturated norbornene group polymer composition 6 1992
* 5334424 Thermoplastic norbornene resin formed articles and sustrates for liquid crystal display 30 1992
 
Montedipe (1)
* 5240998 Thermoplastic compositions based on a vinyl aromatic co-polymer and a polyamide resin 2 1990
 
TDK CORPORATION (1)
* 5244706 Optical recording disk 11 1992
 
SUMITOMO BAKELITE CO., LTD. (1)
* 5115041 Substrate for optical recording media and molding composition therefor 8 1989
 
JSR CORPORATION (2)
* 5053471 Transparent resin material 14 1990
* 5202388 Process for producing hydrogenation product of ring-opening polymer 28 1991
 
MITSUI CHEMICALS, INC. (1)
* 5290877 Information recording medium and adhesive composition therefor 7 1992
* Cited By Examiner

Patent Citation Ranking

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NIPPON ZEON CO., LTD. (2)
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