US 11,993,671 B2
Chloroprene/unsaturated nitrile copolymer, chloroprene/unsaturated nitrile copolymer composition and vulcanized molded article
Wataru Nishino, Itoigawa (JP); Suguru Onuki, Itoigawa (JP); Atsunori Kondo, Itoigawa (JP); Yuhei Ishigaki, Itoigawa (JP); and Naoki Kobayashi, Itoigawa (JP)
Assigned to Denka Company Limited, Tokyo (JP)
Appl. No. 17/291,347
Filed by DENKA COMPANY LIMITED, Tokyo (JP)
PCT Filed Nov. 6, 2019, PCT No. PCT/JP2019/043551
§ 371(c)(1), (2) Date May 5, 2021,
PCT Pub. No. WO2020/095962, PCT Pub. Date May 14, 2020.
Claims priority of application No. 2018-211380 (JP), filed on Nov. 9, 2018.
Prior Publication US 2021/0395422 A1, Dec. 23, 2021
Int. Cl. C08F 236/18 (2006.01); C08F 220/44 (2006.01); B29C 35/02 (2006.01)
CPC C08F 236/18 (2013.01) [C08F 220/44 (2013.01); B29C 35/02 (2013.01); B29K 2011/00 (2013.01)] 17 Claims
 
1. A chloroprene-unsaturated nitrile copolymer comprising 3 to 20% by mass of a structural unit derived from an unsaturated nitrile monomer, wherein
the chloroprene-unsaturated nitrile copolymer comprises a peak at 5.80 to 6.00 ppm in a 1H-NMR spectrum as measured in a deuterochloroform solvent, and
a ratio (A/B) of a peak area (A) at 5.80 to 6.00 ppm and a peak area (B) at 4.05 to 6.20 ppm is 0.6/100 to 1.1/100; wherein
the peak at 5.80 to 6.00 ppm represents a peak derived from vinyl hydrogen atoms of the 1,2-isomer of the chloroprene linking unit in the copolymer, and the peak at 4.05 to 6.20 ppm represents a peak derived from vinyl hydrogen atoms of the chloroprene structural unit in the copolymer.