US 12,421,664 B2
Papermaking agent, manufacturing method for papermaking agent and paper
Ryusuke Kambara, Osaka (JP); Hiroyuki Ioka, Osaka (JP); and Shuichi Takaki, Osaka (JP)
Assigned to ARAKAWA CHEMICAL INDUSTRIES, LTD., Osaka (JP)
Filed by ARAKAWA CHEMICAL INDUSTRIES, LTD., Osaka (JP)
Filed on Sep. 15, 2022, as Appl. No. 17/945,097.
Claims priority of application No. 2021-152558 (JP), filed on Sep. 17, 2021.
Prior Publication US 2023/0085796 A1, Mar. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. D21H 17/37 (2006.01); D21H 17/28 (2006.01); D21H 21/20 (2006.01)
CPC D21H 17/375 (2013.01) [D21H 17/28 (2013.01); D21H 21/20 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A papermaking agent, comprising:
water; and
a (meth)acrylamide polymer containing at least one starch (a1), a (meth)acrylamide (a2), a polymerizable monomer having an amino group (a3), a polymerizable monomer having a carboxy group (a4) and a polymerizable monomer having a sulfonate group (a5) as essential constituent components,
wherein a ratio between an amount of the component (a1) used in terms of non-volatile content weight and a total amount of the components (a2) to (a5) used is [(a1)/{(a2)+(a3)+(a4)+(a5)}]=5/95 to 45/55, and
wherein the papermaking agent has a non-volatile content concentration of 22 to 35 weight %, and wherein the (meth)acrylamide polymer has a weight average molecular weight of 1,500,000 to 7,000,000.