US 12,351,692 B2
Absorbent resin particles and absorbent
Tetsuhiro Kobayashi, Himeji (JP); and Hiroki Sawaki, Himeji (JP)
Assigned to SUMITOMO SEIKA CHEMICALS CO., LTD., Hyogo (JP)
Appl. No. 17/757,136
Filed by SUMITOMO SEIKA CHEMICALS CO., LTD., Hyogo (JP)
PCT Filed Dec. 9, 2020, PCT No. PCT/JP2020/045921
§ 371(c)(1), (2) Date Jun. 9, 2022,
PCT Pub. No. WO2021/117780, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-225184 (JP), filed on Dec. 13, 2019; application No. 2019-225185 (JP), filed on Dec. 13, 2019; application No. 2020-026078 (JP), filed on Feb. 19, 2020; application No. 2020-085218 (JP), filed on May 14, 2020; application No. 2020-085220 (JP), filed on May 14, 2020; application No. 2020-085224 (JP), filed on May 14, 2020; application No. 2020-085226 (JP), filed on May 14, 2020; application No. 2020-085227 (JP), filed on May 14, 2020; and application No. 2020-122800 (JP), filed on Jul. 17, 2020.
Prior Publication US 2023/0036813 A1, Feb. 2, 2023
Int. Cl. C08L 101/14 (2006.01); B01J 20/24 (2006.01); B01J 20/26 (2006.01); B01J 20/28 (2006.01); C08F 2/08 (2006.01); C08F 20/06 (2006.01); C08F 120/06 (2006.01); C08G 65/08 (2006.01); C08J 3/12 (2006.01); C08J 3/16 (2006.01); C08L 33/26 (2006.01)
CPC C08J 3/126 (2013.01) [B01J 20/24 (2013.01); B01J 20/26 (2013.01); B01J 20/261 (2013.01); B01J 20/262 (2013.01); B01J 20/264 (2013.01); B01J 20/265 (2013.01); B01J 20/28 (2013.01); B01J 20/28016 (2013.01); C08F 2/08 (2013.01); C08F 20/06 (2013.01); C08F 120/06 (2013.01); C08G 65/08 (2013.01); C08J 3/16 (2013.01); C08L 33/26 (2013.01); C08L 101/14 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An absorbent material comprising water-absorbent resin particles, wherein the water-absorbent resin particles comprise a polymer particle having water absorption properties; and a coating layer that coats at least a part of a surface of the polymer particle and contains a water-insoluble component that is at least one selected from the group consisting of polyolefins, polyurethanes, and acid-modified products thereof,
the water-absorbent resin particles have a water absorption rate by a Vortex method of 55 seconds or more,
the water-absorbent resin particles have a water retention amount of physiological saline of 35 g/g to 60 g/g, and
the water-absorbent resin particles have a contact angle with 0.9% by mass saline at 25° C.±2° C. of 100 degrees or larger and 130 degrees or smaller.