US 12,110,358 B2
Synthetic polyisoprene latex
Junji Kodemura, Tokyo (JP); Shunjin Aihara, Tokyo (JP); and Yoshitaka Satoh, Tokyo (JP)
Assigned to ZEON CORPORATION, Tokyo (JP)
Appl. No. 16/346,864
Filed by ZEON CORPORATION, Tokyo (JP)
PCT Filed Nov. 2, 2017, PCT No. PCT/JP2017/039740
§ 371(c)(1), (2) Date May 1, 2019,
PCT Pub. No. WO2018/092604, PCT Pub. Date May 24, 2018.
Claims priority of application No. 2016-222316 (JP), filed on Nov. 15, 2016.
Prior Publication US 2020/0062873 A1, Feb. 27, 2020
Int. Cl. C08F 36/08 (2006.01); B29C 41/00 (2006.01); B29K 105/00 (2006.01); B32B 7/12 (2006.01); C08C 2/06 (2006.01); C08C 19/00 (2006.01); C08F 4/46 (2006.01); C08F 136/08 (2006.01); C08J 5/02 (2006.01); C08J 5/18 (2006.01); C08L 9/10 (2006.01); C08L 47/00 (2006.01); C09J 5/00 (2006.01); C09J 109/10 (2006.01)
CPC C08F 36/08 (2013.01) [B29C 41/003 (2013.01); B32B 7/12 (2013.01); C08C 2/06 (2013.01); C08C 19/00 (2013.01); C08F 4/461 (2013.01); C08F 136/08 (2013.01); C08J 5/02 (2013.01); C08J 5/18 (2013.01); C08L 9/10 (2013.01); C08L 47/00 (2013.01); C09J 5/00 (2013.01); C09J 109/10 (2013.01); B29K 2105/0064 (2013.01); B32B 2553/00 (2013.01); C08J 2309/10 (2013.01); C09J 2409/00 (2013.01)] 17 Claims
 
1. A synthetic polyisoprene latex comprising synthetic polyisoprene, wherein
the synthetic polyisoprene constituting the synthetic polyisoprene latex comprises a low-molecular weight synthetic isoprene chain having a molecular weight of less than 1,000,000 at a content rate of 10 to 70% by weight and a high-molecular weight synthetic isoprene chain having a molecular weight of 1,000,000 or more at a content rate of 30 to 90% by weight,
the synthetic polyisoprene constituting the synthetic polyisoprene latex has a molecular weight distribution curve that is bimodal with two local maximum points, with a local minimum point located between the two local maximum points, the local minimum point defining a boundary between a low-molecular weight side and a high-molecular weight side of the molecular weight distribution curve,
a weight average molecular weight on the low-molecular weight side is from 200,000 to less than 1,000,000, and
a weight average molecular weight on the high-molecular weight side is from 3,000,000 to 6,000,000.