Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2005-04-20
2008-11-11
Teskin, Fred M (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S087000, C526S281000, C525S332100, C525S338000, C528S50200C, C359S240000
Reexamination Certificate
active
07449532
ABSTRACT:
A cycloolefin copolymer obtained by ring opening polymerization according to the present invention is characterized by comprising a specific structural unit and exhibiting a single peak in a derivative differential scanning calorimetry curve obtained by differential scanning calorimeter (DSC), having a temperature width of the rising part in the peak of 35° C. or below, and having a glass transition temperature (Tg) of 110° C. or above. The cycloolefin copolymer provided by the present invention has excellent heat resistance and optical properties, is suitable for the formation of a film or sheet therefrom, and can be stretched even at a relatively low temperature around the Tg without causing troubles such as cloudiness. A film or sheet comprising the cycloolefin copolymer, which has excellent optical properties and heat resistance and is also suitable for stretching even at a relatively low temperature, is also provided. Further, there are also provided a retardation plate having excellent optical properties and heat resistance and having uniform retardation, and a process for producing the retardation plate.
REFERENCES:
patent: 6552145 (2003-04-01), Okada et al.
patent: 7037993 (2006-05-01), Taguchi et al.
patent: 2463644 (2003-07-01), None
patent: 2001 187815 (2001-07-01), None
patent: 2003 255102 (2003-09-01), None
patent: WO 03/085025 (2003-10-01), None
Hashiguchi Yuichi
Kajiwara Ichiro
Maruyama Yoichiro
Okaniwa Motoki
Suwa Yoshimi
JSR Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Teskin Fred M
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