Patent ID: 6850682

Claim:
A resin composition for coating an optical fiber, comprising a radical polymerizable compound (A), a photopolymerization initiator (B), a sulfide (C) and an organic amine (D), wherein the sulfide (C) is a compound represented by the following formula 1, 2, 3, 4, 5 or 6: R 1 —S—R 1 (Formula 1) R 2 OCOCH 2 CH 2 —S—CH 2 CH 2 COOR 2 (Formula 2) (R 3 —SCH 2 CH 2 COOCH 2 ) 4 C (Formula 3) HOCH 2 CH 2 S—R 4 —SCH 2 CH 2 OH (Formula 4) R 8 —SCH 2 CH 2 COOR 9 (Formula 6) wherein R 1 represents an alkyl group having 1 to 24 carbon atoms, an alkenyl group having 1 to 24 carbon atoms, or a phenyl group which may be substituted with one or more hydroxyl groups or one or more halogen atoms, R 2 , R 3 , R 5 , R 6 , R 7 , R 8 and R 9 represent an alkyl group having 1 to 24 carbon atoms or an alkenyl group having 1 to 24 carbon atoms, and R 4 represents an alkylene group having 1 to 24 carbon atoms or an alkenylene group having 1 to 24 carbon atoms, and the organic amine (D) is a hindered amine having a group represented by the following formula 7: wherein R 10 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 12 carbon atoms, R 11 represents an alkyl group having 1 to 4 carbon atoms, and m and n each independently represents an integer of 0 to 2 and the sum total of m and n is from 1 to 3.