US 12,271,026 B2
Resin composition, optical fiber, and method for producing optical fiber
Yuya Homma, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/790,166
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
PCT Filed Dec. 8, 2020, PCT No. PCT/JP2020/045655
§ 371(c)(1), (2) Date Jun. 30, 2022,
PCT Pub. No. WO2021/145102, PCT Pub. Date Jul. 22, 2021.
Claims priority of application No. 2020-003515 (JP), filed on Jan. 14, 2020.
Prior Publication US 2023/0046664 A1, Feb. 16, 2023
Int. Cl. G02B 6/02 (2006.01); C03C 25/1065 (2018.01); C03C 25/285 (2018.01); C03C 25/326 (2018.01); C03C 25/6226 (2018.01); C08F 290/06 (2006.01); C09D 151/08 (2006.01)
CPC G02B 6/02395 (2013.01) [C03C 25/1065 (2013.01); C03C 25/285 (2013.01); C03C 25/326 (2013.01); C03C 25/6226 (2013.01); C08F 290/067 (2013.01); C09D 151/08 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A resin composition for secondary coating of an optical fiber, comprising:
a photopolymerizable compound comprising a urethane (meth)acrylate (A) having a number average molecular weight of 21000 or more and 40000 or less, a urethane (meth)acrylate (B) having a number average molecular weight of 1000 or more and 6000 or less, and an epoxy (meth)acrylate; and
a photopolymerization initiator,
wherein a content of the urethane (meth)acrylate (A) is 0.05 parts by mass or more and 15 parts by mass or less based on a total amount of the resin composition of 100 parts by mass, and
the urethane (meth)acrylate (A) is a reaction product of a polyol having a number average molecular weight of 1800 or more and 4500 or less, a diisocyanate, and a hydroxyl group-containing (meth)acrylate.