Title:
NORBORNENE-BASED ADDITION TYPE COPOLYMER
Document Type and Number:
Japanese Patent JP3534127
Kind Code:
B2
Abstract:
PURPOSE: To obtain a new thermoplastic norbornene-based copolymer, excellent in transparency, low birefringent properties, moisture, water and chemical resistances, electrical characteristics and low eluting properties of impurities and having a proper glass transition temperature and further heat resistance and easiness of melt molding in combination.
CONSTITUTION: This addition type copolymer is obtained by carrying out the addition type copolymerization of (A) norbornene or a substituted norbornene having a ≤3C hydrocarbon group (preferably norbornene) with (B) an alkyl- substituted norbornene having a ≥5C alkyl substituent group (preferably 5- hexyl-2-norbornene) without opening the ring. The resultant copolymer comprises (a) 15-70wt.% addition type recurring unit derived from the monomer (A) and (b) 85-30wt.% addition type recurring unit derived from the monomer (B) and has 50,000-1,000,000 number-average molecular weight and 140-210°C glass transition temperature.
Inventors:
Obara, Teiji
Application Number:
JP2597395A
Publication Date:
June 07, 2004
Filing Date:
January 20, 1995
Export Citation:
Assignee:
NIPPON ZEON CO LTD
International Classes:
C08F232/08; C08F32/00; H05K1/03; (IPC1-7): C08F232/08
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