US 11,697,616 B2
Radiation polymerizable composition, cured layer of same, optical fiber containing cured layer and method for producing same
Daigou Mochizuki, Ibaraki (JP); Takumi Nakajima, Mie (JP); and Noriyasu Shinohara, Ibaraki (JP)
Assigned to Japan Fine Coatings Co., Ltd., Ibaraki (JP)
Appl. No. 17/791,937
Filed by Japan Fine Coatings Co., Ltd., Ibaraki (JP)
PCT Filed Jan. 15, 2021, PCT No. PCT/JP2021/001263
§ 371(c)(1), (2) Date Jul. 11, 2022,
PCT Pub. No. WO2021/145433, PCT Pub. Date Jul. 22, 2021.
Claims priority of application No. 2020-005448 (JP), filed on Jan. 16, 2020.
Prior Publication US 2023/0122926 A1, Apr. 20, 2023
Int. Cl. C03C 25/326 (2018.01); C08G 18/76 (2006.01); C03C 25/104 (2018.01); C09D 175/16 (2006.01); C08F 290/06 (2006.01); C08F 222/06 (2006.01); C08F 222/40 (2006.01); C08G 18/67 (2006.01); C08G 18/04 (2006.01); C03C 25/28 (2018.01)
CPC C03C 25/326 (2013.01) [C03C 25/104 (2013.01); C03C 25/28 (2013.01); C08F 222/06 (2013.01); C08F 222/40 (2013.01); C08F 290/067 (2013.01); C08G 18/04 (2013.01); C08G 18/6715 (2013.01); C08G 18/76 (2013.01); C09D 175/16 (2013.01)] 17 Claims
 
1. A radiation polymerizable composition for forming a primary coating layer of an optical fiber, the radiation polymerizable composition comprising:
(A) a urethane oligomer comprising a structure represented by formula (I) below:

OG Complex Work Unit Chemistry
wherein R is a vinyl group and * is a bond;
(B) one or more compounds of:
(i) maleic anhydride,
(ii) a compound represented by formula (II) below:

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wherein R1 is a single bond or an alkanediyl group comprising 1 to 6 carbon atoms, and
R2 is a hydrogen atom, a hydroxy group, or a group represented by formula (II-1) or formula (II-2) below:

OG Complex Work Unit Chemistry
wherein R3 is a hydrogen atom, an amino group, a carboxy group, a hydroxy group, an alkyl group, or an alkoxy group, and * is a bond, and

OG Complex Work Unit Chemistry
wherein R4 is a hydrogen atom, an amino group, a carboxy group, a hydroxy group, an alkyl group, or an alkoxy group, and * is a bond, or
(iii) a compound represented by formula (III) below:

OG Complex Work Unit Chemistry
wherein R5 is an alkanediyl group comprising 1 to 6 carbon atoms; and
(C) a radiation polymerization initiator.