| US 7,449,532 B2 | ||
| Cycloolefin copolymer obtained by ring-opening polymerization, use thereof, and process for producing retardation plate comprising the copolymer | ||
| Motoki Okaniwa, Chuo-ku (Japan); Ichiro Kajiwara, Chuo-ku (Japan); Yoshimi Suwa, Chuo-ku (Japan); Yoichiro Maruyama, Chuo-ku (Japan); and Yuichi Hashiguchi, Chuo-ku (Japan) | ||
| Assigned to JSR Corporation, Tokyo (Japan) | ||
| Appl. No. 11/587,050 PCT Filed Apr. 20, 2005, PCT No. PCT/JP2005/007515 § 371(c)(1), (2), (4) Date Oct. 20, 2006, PCT Pub. No. WO2005/103108, PCT Pub. Date Nov. 03, 2005. |
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| Claims priority of application No. 2004-124170 (JP), filed on Apr. 20, 2004. | ||
| Prior Publication US 2007/0179264 A1, Aug. 02, 2007 | ||
| Int. Cl. C08G 61/08 (2006.01); C08F 8/04 (2006.01); G02B 1/04 (2006.01) | ||
| U.S. Cl. 526—283 [526/87; 526/281; 525/332.1; 525/338; 528/502 B; 359/240] | 8 Claims |
1. A cycloolefin copolymer obtained by ring opening polymerization, comprising a structural unit represented by general formula
(1) 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, wherein the cycloolefin copolymer comprises a copolymer of 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.12,5.17,10]-3-dodecene with tricyclo[4.3.0.12,5]deca-3,7-diene:
 wherein m is 0 (zero), 1 or 2, p is 0 (zero) or 1, X independently represents a group represented by formula: —CH═CH— or a
group represented by formula: —CH2CH2—, R1 to R4 each independently represent a hydrogen atom; a halogen atom; a substituted or unsubstituted hydrocarbon group having 1 to
30 carbon atoms and optionally having a linking group containing oxygen, nitrogen, sulfur, or silicon; or a polar group, and
R1 and R2, or R3 and R4 together may combine to form a mono- or polycyclic carbocyclic or heterocyclic ring.
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