RUBBER FOR HERMETICALLY SEALABLE PACKING AND RUBBER COMPOSITION FOR SEALING MOUTH OF CAPACITOR

Japanese Patent JP3803173

B2

PROBLEM TO BE SOLVED: To obtain the subject rubber composition capable of exhibiting excellent hermetically sealing property, weatherability, creep resistance, etc., by including an ethylene α-olefin-polyene amorphous copolymer exhibiting a specific structure.
SOLUTION: This rubber composition comprises (A) an ethylene-α-olefin- polyene amorphous copolymer, and the non-conjugated polyene comprises a norbornene compound having a chemical structure of formula I [(n) is an integer of 0-10; R1 is H or 1-10C alkyl; R2 is H or 1-5C alkyl] or formula II [R3 is H or 1-10C alkyl]. The component A preferably satisfies the following items: (i) A molar ratio (ethylene/α-olefin) of ethylene to a 3-20C α-olefin is (50/50) to (90/10) and (ii) iodine value is 0.5-50 and (iii) intrinsic viscosity in decalin solution at 135°C is 1-3 dL/g. A sealing rubber composition for sealing mouths of capacitors, excellent in hermetically sealing property, weather resistance, etc., can be expected thereby.

Takashi Shirata
Yoshiharu Kikuchi
Mikio Hosoya
Tetsuo Tojo

JP20031197A

August 02, 2006

July 25, 1997

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Mitsui Chemicals, Inc.

C08L23/16; C09K3/10; C08F4/68; C08F210/18; C08F232/08; C08K3/00; C08K3/04; C08K3/34; C08K5/00; C08K5/01; C08K5/14; C08K13/02; C08L23/08; (IPC1-7): C08F210/18; C08F4/68; C08F232/08; C08K3/00; C08K3/04; C08K3/34; C08K5/00; C08K5/01; C08K5/14; C08L23/08; C08L23/16; C09K3/10

JP5283302A
JP60092380A
JP10045977A
JP63008408A
JP58191705A

WO1997000291A1
GB1149928B

Shunichiro Suzuki

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